Deepest Ever Deep Field. Where Are The Limits of James Webb?
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- Опубликовано: 10 июн 2024
- We all know the Hubble Deep Field as one of the most important astronomy images of all time. But when will we get a similar attempt from Webb? What will we be able to get from it and what are the limits of JWST? Finding out with Dr Viraj Pandya from NASA.
👉 Nobel Prize Winner Explains JWST vs The Crisis in Cosmology
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00:00 Intro
01:43 Galaxy classification
08:20 Hubble's observations and biases
19:53 Breadstick galaxies
31:07 Wen JWST Deep Field
43:58 What is the limit of Webb
52:03 Final thoughts
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A note from Viraj,
"I just saw your video from our interview and think it's fantastic! Thank you so much again. It seems many of your viewers were interested in the planning of future JWST deep field surveys (based on the video title) but that is not my current interest/expertise -- it is something I'd like to help with in a few years after I get a permanent faculty-level position (fingers crossed). But right now, as an early career researcher, thanks to the work of many others who dedicated lots of time to the planning of surveys like CEERS, I have the privilege of focusing my time on thinking deeply about galaxy formation using these amazing observations and by developing new theoretical models (like what we discussed in the first half of the video).
I highly recommend getting someone from the JADES team on your podcast -- they are at the current frontier of JWST deep fields so will know much more than me about what is and isn't possible over the next few years (as I said, I'm focused on the science itself). They've already surveyed areas including and surrounding the Hubble Deep Fields North and South. As discussed in section 4.1 and Table 1 of Eisenstein+23 (arXiv:2306.02465), some of their deepest imaging in any particular pointing and in any single filter is of order ~10 hours which is a factor of ~5 lower than the deepest single pointing (in a single filter) from the latest "Hubble Legacy Field" (Whitaker+19). And yet as Figure 5 from Eisenstein+23 beautifully shows, this ~10 hour JWST imaging is already much more sensitive than the deepest single ~65 hour Hubble Legacy Field imaging (at a similar wavelength). There is also another "JADES Origins Deep Field" (Eisenstein+23, arXiv:2310.12340) whose deepest single pointing (in a single filter) may approach or even exceed the deepest single-pointing, single-filter HDF images with 50+ hours. On top of this, they are investing a significant chunk of time on spectroscopy -- I discussed the importance of spectroscopy in the first half of the video for, e.g., constraining the kinematics of stars/gas in low-mass high-redshift elongated galaxies. You can probably extrapolate what will be possible for JWST Deep Fields over the ~15-20 year lifetime of JWST based on the incredible work that JADES has done.
I also wanted to clarify that I mis-spoke at ~37:30. The HST-CANDELS program was ~2 months total of observing time but that was split among 5 fields, and there is nuance in the depth of individual pointings (in individual filters) in any individual field. In other words, not all tiles for the mosaic in a single field have the same exposure time. For GOODS-S and GOODS-N (which contain the HDF-S and HDF-N, respectively), some of the deepest imaging is indeed ~50+ hours in a single pointing (in a single filter). For the wider (shallower) parts of CANDELS in the UDS, EGS and COSMOS fields, the depth drops to a few hours at most in a single tile with a single filter. This nuance is important because it can be confusing to say that a deep field was "100s or 1000s" of hours -- indeed, the latest Hubble Legacy Field in GOODS-S (containing HUDF) has a total exposure time of 6.3 Megasec ~ 1750 hours, but what's more useful from a practical point of view is to quote the *range* of exposure times in a single filter over the full survey area (as nicely shown in Figure 1 of Whitaker+19). For example, the original Hubble Deep Field was 140 hours (Table 5 of Williams+96) but that was split into ~30-40 hour images in four different filters -- this was unprecedentedly deep in individual filters and only feasible because they didn't do a mosaic (effectively just a single tile/pointing)."
Sincerely,
Viraj
I am in awe with what JWST has already achieved, but I share the disappointment that JWST has not yet fully exploited its potential to produce a step-change in deep field observation. The original discussion suggested that JWST can achieve more in 50 minutes (on one tile of the sky) than Hubble did in 50 days (72000 minutes per tile). I understand that this was a mistake, but that JWST is about 7-10 times faster than Hubble, so could achieve better results to Hubble in a week.
This is publicly funded science, and so should pay attention to what will interest the public. Thus it is disappointing also that diminishing returns on longer deep field observations are not widely discussed. Why not imagine what JWST could achieve in 2 months of deep field observations? That still leaves 10 months for other observations.
Normally interviews like these don't really captivate me but, Fraser does a really good job with the questions that he asks that I can't stop listening, it also helps when you have really interesting guests like Dr Pandya. I can't wait for the next one.
I thought his guest was one of the most likeable and interesting people I've heard... and that's from a field of often articulate and interesting people (imo, ofc), despite the stereotype of the "antisocial scientist." I really hope to see more of the good Dr. in the years to come.
That's the first time I've heard somebody being interviewed saying "thanks. It's been a lot of fun." For an esteemed scientist to say that to you greatly impresses me. Congratulations Fraser!! And greetings from Thailand.
He paid homage to my favorite food, 🍕 pizza. Hes alright in my book.
These recent interviews are awesome and your questions and reasoning are great. Well done Fraser.
You are hitting home run after home run with your interviews. The guests are highly knowledgeable, are great communicators, topics are very interesting, and you're asking high quality questions. I think you're doing a wonderful job and sincerely thank you for bringing such high quality Science for presentation on YT. 👏
Thanks a lot, I'm glad you're enjoying them. They're very fun and easy for me to do too. :-)
Couldn't agree more.
@frasercain they are only easy because you have gained the background to know what to ask. It allows you to avoid the disgustingly dumbed down versions that unscientific interviewers get.
Dr. Pandya sucks! He don't know weather he is coming or going. He dances around deep field topics and just says, "I'm not thinking about that". Well tough sht, that's what people want to know, is the deep field info. How long will jwst be spent staring at one spot? He just says I don't think about that. Terrible guest. The way he looks down and away when asked about deep field shows he is totally incompetent when it comes to this subject
@@Mr.DeleteriousYou’re in such a minority with that comment that you’re probably going to have to start hating yourself
The exposure length limits due to background light is addressed in a JWST Science Working Group paper titled The Scientific Capabilities of the James Webb Space Telescope. It is available on-line as a pdf.
This was a fantastic interview. You can tell Dr. Pandya loves and is excited about his work.
Dr. Pandya's food analogies absolutely work for me! 🤣
Thanks for these interviews, Fraser. Please, never get tired of doing them!
The Hubble Deep field, as wonderful as it is, only took 100 hrs, not thousands.
However, I love these interviews. Great to get the insights of experts actually working on and with these projects. 👍
I thought that sounded wrong...
Great interview and interviewee, yes. Impressive when someone successfully conveys their visualisation of dynamics.
Great you tube with a great subject. Definitely the best work on Galaxies I have seen so far
I liked Viraj's attitude... just straight up admitted when he didn't know something, and then demonstrated interest in the question?
I agree with Fraser.
If waiting for Roman to come online and having that ability to do a wider range view prior to a James Webb deep field, this will allow for a better targeting range for Webb to deep field and whether a longer/shorter exposure is needed.
JW has plenty of science to do before that decision is needed. Besides, they can do both w/a shorter exposure now and after Roman is alive, proceed w/a longer more targeted exposure then.
It would be wild if the JWST did like 100 hours like Hubble and it just came back solid light...so many galaxies that they became one light in the survey...
Another great interview, "Deepest Ever Deep Field", that I could not stop listening to! It would be most helpful to my limited, linear mind, to see pictures flashed up on objects being discussed, e.g. Hubble deep field view, bread stick galaxies, 15 red shift galaxies, and even such 'mundane' things as Red Dwarf, Blue stars?, edge on elliptical galaxy, etc, etc....
I also have a limited, linear mind. Throughout the video I couldn't help but think that the occasional visual representation of what was being discussed would have helped me understand it so much better. I know what a breadstick looks like, but I have no idea what a breadstick shaped galaxy looks like.. I also know that it may not be that easy to portray such complex concepts in visual form. Also someone has to create these images and insert them into the video which I'm sure is a monumental task in itself. However I still appreciate these men for doing the best they could to explain what they could. Great interview like you said.
I've never commented before, but had to for this. Viraj was far and away one of the best interviews I've seen - wonderfully knowledgeable, thoughtful, and so interesting. And Fraser excellent as always. Thanks for all you do, and hoping for a follow-up interview with Viraj someday!
Loved it as usual. It's sometimes hard to click on these instead of some anger-inducing drama. But I'm always happy that I clicked
I'm in the middle of watching this interesting video, and the discussion of the breadstick shape evolving to the spirals we're familiar with has ended. Probably no one knows, but I'm wondering whether the bar in barred spirals is a remnant of that breadstick.
Just what I am thinking at the same part of the interview.
Great interview. You guys did a great job of painting a pictures for me. Thank you!
This discussion with Viraj is so interesting . Cain is a GREAT Interviewer, and the discussion is deep but so clear. Thank you for doing this!
This is a great interview. Thank you Fraser and Dr. Pandya.
Great interview, thanks both of you.
Fascinating insights into the cosmos! Thank you for sharing, I thoroughly enjoyed the information. Sending love from Ontario Canada. ❤️🎶🍁
Absolutely fascinating...again! Thanks to all involved.
Great topic, thanks for the interview! Also this is one of few interviews I need to rewatch becsuse the ammount of new information and thought experiments. I think the large structure of the universe should get more time on this channel, it's so fascinating!
Captivating interview, well done, that was fascinating.
Absolutely loved this discussion. Fascinating! ❤️
Perfect for a Sunday mornings viewing
Excellent informative and interesting interview. I enjoyed the insightful questions and the straightforward answers. Fraser, your questions do a great job of helping guests with painting the big picture as well as extracting meaningful, supportive details. And your steady stream of articulate leaders in each field is also superb. Best interview so far. I am amazed that there are breadstick galaxies. Keep up the excellent work.
I learned soooo much on this one! Ty ty ty Fraser!
Thank you for a plethora of great content
I found this very useful and informative. The "breadsticks" speculation is a useful testable concept.
Awesome interview!!
This discussion is SO cool!!
Bless you to the person in the background.
Great interview, great interviewee
Thank you for a wonderful discussion.
43:41 i think this was a perfect answer Fraser, the diminishing returns starts with the overlap of ROMAN. There is no point in wasting JamesWEB time on something that newer telescopes will be able to do exponentially faster.
Amazing interview
Fraser Cain is such a great choice for explaining the Hubble and James Webb ultra deep field images. His sentences are clear and informative. I’m glad he is our guide!
Interviews are my favorites
great interview
Honestly I would have expected your guest to know the answer to the limits question as it’s something I’ve wondered myself and seems fundamental to the field. The fact that it hadn’t even occurred to him is surprising.
Maybe it'll turn into a paper. :-)
You're amazing Fraser, the stuff you know is scary.
Great video. Also, your only video that has made me hungry haha.
Last week astronomers dreamt of pool noodles and frisbees. This week it's bread sticks and pizza. Humans are wonderful.
What about EUCLID? Seems to have a similar mission to Roman. How will they work together, and with webb?
Awesome topic and guest. How was this not one of the first things JWST did? It would be the most incredible thing ever. Really interesting discussion
We want more and soon.
Thanks to Vijar 😊😊
Dude that was great!
Thanks Fraser. You could tell that he loves what he does.
So often, my hobby - aspiring to be an autodidact, polymath, polyglot, Renaissance man, and natural philosopher - makes me feel stupid. Like when I set my curtains on fire with a laser or blow the door off my shed making rocket motors. In fact, feeling daft is a good thing, as the Dunning-Kruger effect tells me. Yet, it is always a joy to feel clever after watching Mr. Cain's video content. His penetrating questions and fantastic subject matter are much appreciated. Thanks.
What a great read
omg is this guy pleasant and chill 😎👍
I just want to thank you all for the knowledge shared and insights in the journey so far with JWTS along with the gifts from the images and what we know so far. I appreciate the educational aspects too by the bucket load along with the additional comments from Viraj and others commenting on what is really needed to get understandable information.
I am not educated in any way but only want to say thank you for what you share as I still catch my breath at moments in my life time.
Well done. Thank you.
You and Viraj both have infectious passion and this has been great to watch and listen to! Also agreeing with a comment below, Dr. Pandya's analogies are perfect lmaoo
42:00 What is the noise floor on the sensors? Would ten 100 hour exposures look different than 100 ten hour exposures?
So through the direction of those early breadstick shaped galaxies, you can map the dark matter filaments. It’s quite a feat to be able to map these filaments and intersections that we can’t even see. You guys are doing extraordinary stellar work!
p.s. Just stumbled upon your channel, it’s doing a great job at explaining this information in a comprehensible manner to novices, like me. Thank you! I also enjoyed listening to Dr Viraj Pandiya.
So do we have any galaxies that we *know* are breadstick galaxies, and if so, what is the closest one? Is there any reason we should be finding these in the distant past but not in contemporaneous time?
I've used the ultra-deep field Hubble image for years as my desktop wallpaper!
Im not much for interviews but that was great.
exciting times, especially with the studies being done on the age of universe being twice as old as we thought!
I confess I was aching for a visual of a breadstick galaxy.
Very interesting.
But, wat is with the wen?
Sorry, what is with the when?
Question, can there be a correlation with the bar in the center of the pizzas and your breadstick?
Very interesting. Have you read Time Waves on the Shores of Forever, lots of similar ideas..
When or wen?!!
Yeah, wth. I looked fairly extensively for "wen" as a scientific term or acronym related to JWST or astronomy, but did he really just misspell "when" repeatedly and in the thumbnail?
Hey Frasier, the moon regolith is known to be really rough on space equipment, plants, and lungs. Is there some kind of device like a rock polisher that could be used to make it safer for things like plants?
Incredible! Ty
God bless you **(to the sneeze)
I have a naïve question about the distance ladder. I gather that the first rung of the ladder is dependent on parallax measures of distances to Cepheid variables to get the absolute luminosities of the stars and these measurements are limited by the size of the base line constituted by opposite sides of the earth’s orbit around the sun. I’ve wondered whether astronomers have also tried comparing current star fields to historical photographs from say 100 years ago to get a longer baseline constituted by the distance traveled by the earth around the center of the Milky Way during that time. If that were doable, it would seem that it would refine the distances to the stars already measured by the standard method, and would extend the sphere in which Cepheid variable distances could be measured. Is that something that just hasn’t been done because it’s not practicable due to the difference in technique over time, or due to the fact that you could only get one measurement, rather than repeated measurements as you could using the earths orbit, or are such measurements part of the current understanding of the first rung of the latter?
Are you accounting for the time lapse factor? Is it even significant at those distances? A doughnut could stretch out to a breadstick depending on orientation…
The popping in to existence is the key to the wavelength of a mass ejection points they lost there energia but continue on with the barometric pressure that no vibration system that electrons flows through from point to point interactions
The Hubble deep feild was a little over 100 hours of exposure time. Not thousands of hours.
Fraser, the satellite galaxies are the peperami flying off the rotating pizza 🥴
That is amazing! All the Astronomy details and searches that are planned!. All this time I was shaking my head at the U.S. Military for using so many Acronyms . And then here comes C.e.e.r.s. lol I guess we will never be without tons of acronyms in our life lol. Thank you Fraser.
What gives with the "WEN" acronym? I see it in the thumbnail and in the chapter title, but the explanation escapes me, am I missing something?
It's a reference to a meme.
I think that the 15 min with JWST vs. 50 days Hubble is mostly explained by the fact that the far away galaxies are seen in great part in infrared that JWST is designed for, Hubble being designed for visible (and ultra v)..
I would like to see an ultra deep field view 180 deg from Hubbles original...!
It seems to me that the expansion of space-time could describe these 'breadsticks'. Does the direction of the breadstick correlate to the expansion?
Oh man I'm looking forward to this. Also is like like matter and the void or dark matter are like oil and water in a way?
Pardon? Sorry, this question is rather incomprehensible. :/
What about pretzel galaxies?
Could this be evidence that there is some preferential orientation of galaxies within the universe over time?
I was startled when Dr Pandya suggested dark matter in a filament was responsible for the breadstick shape of some early galaxies. In my astronomy study the cosmic web was a filamentary network composed of filaments, sheets, knots and voids. I understood voids are vast empty regions, knots are massive galaxy clusters, and filaments and sheets connect the knots. Filaments were highways or transport channels that channelled mass and galaxies into higher density cluster regions. It makes sense that the cosmic web can outline and reveal the locations of dark matter. If merging dwarf galaxies are drawn into a filament this may explain the breadstick shape of the resulting galaxy. But filaments are present in the early and late universe, why are breadsticks only seen in the early universe?
The "breadstick" observation feels so much like an artifact of the way we're observing, in a universe with lensing, expansion, time dilation, etc.
But experts would know a lot better than I would.
Actually, I had assumed that by now a JWST deep field had already been done. Please do some in pairs, 180 degrees from each other so comparisons can be made. I would like to know if there are similarities at opposite sides of the universe - or are they wildly different?
It should have already been done. My assumption. The 1st year of images was required by law to be public domain. After that the images can be held for up to 1 year. While they write their Nobel prize, having exclusive rights to the image.
Realy I likethisvideo so much like you can imagine
Do these breadsticks still have SMBH at their center?
The Universe is endless ... it just goes on, and on, and on.
Does JWST have to factor in “rest time” occasionally or is it catching photons 24/7/365.25❓
JWST has like a dozen individual detectors and they are on all the time. When the telescope is changing direction or filter wheels are moving, all or some of the detectors are off. So kinda off time when moving.
I'm curious if these observed "breadstick" shaped galaxies may have started out as the "contrails" of old quasar streams?
🧐good idea!
Yeah someone already made that prediction. They took away his telescope time. Seriously. Edit: Now i am confused if you already knew that.
Really? No, I’m not familiar with that.
@@Hal_McKinney i won't mention his name the community would go nuts. But If you happened to searched for "quasars birth galaxies."You will most likely will find it.
What is the maximum redshift factor that the James Webb space telescope can detect❓
So, is it like a stream of water breaking up into individual droplets as water falls / the universe expands? That process, could start with the dark matter, and star formation develop later to make it visible.
Question: can the lack of star formation in galaxies in denser clusters be a Fermi paradox solution? "Galactic supercluster habitable zone"
I like this video so so much its incredible
Glad you enjoyed it.
So, what happens if we leave JWST looking at deep field for the same length of time as hubble?
Better resolution?
It's about 50 times more sensitive.
If you could choose one a sample return mission of any object in the solar system, what would it be?
cool workds is getting time to look for exoplants
This channel is out of control. A new episode every day for 2 weeks now?!
It's like Groundhog's Day but every day is Christmas with different and exciting gifts.
Nice interview, thanks!
If we actually discover this empty space (behind the edge of our universe) with an advanced telescope that reaches and observes even further than the JWST or Hubble ST, it will only be because the general collapse of matter of the previous universe took place there, the so-called Big Rip or Big Freeze. However, this period would be limited, depending on how long the predecessor's dying process took...
Even in the Voids there are far fewer or hardly any stars and galaxies or clusters than in other areas of the universe - I think the reason is that at the very beginning of the cosmos there were many small pocket universes, or rather small bubble multiverses, which later all merged into one single gigantic universe, so these are unfilled spaces from a previous border zone...
Then to the mysterious dark matter - the “glue” that holds galaxies together.
I'm not so sure whether it really exists. At least I think the word “dark matter” is wrongly chosen; I would call these phenomena or force "space-connecting gravity"... 🌀
Not doing a deep field with WEB is like not looking for the Higgs particle with the LHC.
JW deepfield will be an eye opener 😮