JWST has shattered the record for most distant galaxy.
The viewing area of the JADES survey, along with the four most distant galaxies verified within this field-of-view. The three galaxies at z = 13.20, 12.63, and 11.58 are all more distant than the previous record-holder, GN-z11, which had been identified by Hubble and has now been spectroscopically confirmed by JWST to be at a redshift of z = 10.6.
( Credit: NASA, ESA, CSA, M. Zamani (ESA/Webb), Leah Hustak (STScI); Science credits: Brant Robertson (UC Santa Cruz), S. Tacchella (Cambridge), E. Curtis-Lake (UOH), S. Carniani (Scuola Normale Superiore), JADES Collaboration)
At 33 billion light-years away,
JADES-GS-z13-0 is the farthest object ever seen.
The light from any galaxy that was emitted after the start of the hot Big Bang, 13.8 billion years ago, would have reached us by today so long as it’s within about 46.1 billion light-years at present. But the light from the earliest, most distant galaxies will be blocked by intervening matter and redshifted by the expanding Universe. Both represent severe challenges to detection, which is why Hubble couldn’t see beyond about a redshift of 11, even under the most serendipitous circumstances. JWST has already broken that record.
( Credit: F. Summers, A. Pagan, L. Hustak, G. Bacon, Z. Levay, and L. Frattere (STScI))
Its light was emitted
just 320 million years after the Big Bang.
Schematic diagram of the Universe’s history, highlighting reionization. Before stars or galaxies formed, the Universe was full of light-blocking, neutral atoms that formed back when the Universe was ~380,000 years old. Most of the Universe doesn’t become reionized until 550 million years afterward, with some regions achieving full reionization earlier and others later. The first major waves of reionization begin happening at around ~200 million years of age, while a few fortunate stars may form just 50-to-100 million years after the Big Bang. With the right tools, like the JWST, we are beginning to reveal more distant galaxies than any other tool had made possible previously.
Credit: S. G. Djorgovski et al., Caltech; Caltech Digital Media Center
We’re seeing back 13.5 billion years: to
when the Universe was 2.3% its current age.
The probabilities of finding galaxies of a certain redshift/brightness combination within a particular volume of space, color-coded for likelihood. The earliest JWST galaxy candidates (at z > 10), some of which have now been verified, don’t pose as much of a problem for what should exist within our Universe versus what we’re finding as the large, bright, massive galaxies at more modest (10 > z > 6) redshifts.
( Credit: M. Boylan-Kolchin, MNRAS submitted, 2022)
This far outstrips
anything Hubble could’ve done.
Only because this distant galaxy, GN-z11, is located in a region where the intergalactic medium is mostly reionized, can Hubble reveal it to us at the present time. To see further, we require a better observatory, optimized for these kinds of detection, than Hubble, like JWST. Wherever there’s less light-blocking material, these ultra-distant galaxies will be easier to see with any observatory.
Credit: NASA, ESA, P. Oesch and B. Robertson (University of California, Santa Cruz), and A. Feild (STScI)
Hubble is warm, small, and
limited in wavelength range.
Over the course of 50 days, with a total of over 2 million seconds of total observing time (the equivalent of 23 complete days), the Hubble eXtreme Deep Field (XDF) was constructed from a portion of the prior Hubble Ultra Deep Field image. Combining light from ultraviolet through visible light and out to Hubble’s near-infrared limit, the XDF represented humanity’s deepest view of the cosmos: a record that stood until it was broken by JWST. In the red box, where no galaxies are seen by Hubble, the JWST’s JADES survey revealed the most distant galaxy to date: JADES-GS-z13-0. Extrapolating beyond what we see to what we know and expect must exist, we infer a total of ~2 sextillion stars within the observable Universe.
( Credit: NASA, ESA, G. Illingworth, D. Magee, and P. Oesch (University of California, Santa Cruz), R. Bouwens (Leiden University), and the HUDF09 Team; Annotations and stitching by E. Siegel)
JWST overcomes all of these constraints, while including a superior spectrograph.
The JWST, now fully operational, has seven times the light-gathering power of Hubble, but will be able to see much farther into the infrared portion of the spectrum, revealing those galaxies existing even earlier than what Hubble could ever see, owing to its longer-wavelength capabilities and much lower operating temperatures. Galaxy populations seen prior to the epoch of reionization should abundantly be discovered, and Hubble’s old cosmic distance record has already been broken.
Credit: NASA/JWST Science Team; composite by E. Siegel
By breaking up light into its individual wavelengths, JWST sees both absorbed and transmitted light.
The spectra obtained by JADES and the JWST NIRSpec instrument for the four most distant galaxies found thus far by the JADES survey. The Lyman break feature, robustly identified here for each of the four galaxies, determines the distance and redshift beyond a reasonable doubt, making JADES-GS-z13-0 the current cosmic record-holder for most distant galaxy.
Credit: JADES Collaboration, E. Curtis-Lake et al., preprint, 2022
Using both the NIRCam and NIRSpec instruments,
it’s begun conducting the JADES survey.
This image shows the region of study of the JWST Advanced Deep Extragalactic Survey (JADES). This area includes and contains the Hubble eXtreme Deep Field and reveals new, record-breakingly distant galaxies that Hubble could not see.
( Credit: NASA, ESA, CSA, M. Zamani (ESA/Webb); Science credits: Brant Robertson (UC Santa Cruz), S. Tacchella (Cambridge), E. Curtis-Lake (UOH), S. Carniani (Scuola Normale Superiore), JADES Collaboration)
JADES — the JWST Advanced Deep Extragalactic Survey — will ultimately combine
hundreds of hours of observations.
The spectroscopic identification of the Lyman break signature, present and easily visible in all four ultra-distant, JWST-identified galaxies from the JADES deep field, confirms their redshift and distance. This observation gave us, at the time, the top three most distant galaxies of all, with spectroscopic confirmation. The Lyman break feature, normally resulting in an ultraviolet photon, can be seen well into the infrared from these galaxies owing to the redshifting of the light during its journey.
Credit: NASA, ESA, CSA, M. Zamani (ESA/Webb), Leah Hustak (STScI); Science credits: Brant Robertson (UC Santa Cruz), S. Tacchella (Cambridge), E. Curtis-Lake (UOH), S. Carniani (Scuola Normale Superiore), JADES Collaboration
Whenever faint, red galaxies show a critical “cutoff” in wavelength, their distance/redshift can be measured.
A combination of spectroscopy (top), likelihood comparisons with detailed simulations (middle), and photometry (bottom) have all been used to determine the distance to and properties of most distant galaxy JADES-GS-z13-0. Further analysis rules out other line possibilities, including carbon, oxygen, and a Balmer break, ensuring this galaxy really is sending light to us from a whopping 13.5 billion years ago.
( Credit: JADES Collaboration, E. Curtis-Lake et al., preprint, 2022)
At a redshift of 13.2 — meaning the observed light is 1320% longer than the emitted wavelength — JADES-GS-z13-0 breaks Hubble’s old record.
This illustration shows the spectrum from the most distant galaxy identified in JWST’s first deep-field image, along with the spectral lines that correspond to various elements and ions. The spectrum showcases the power of spectroscopy to reveal an incontrovertible distance and redshift for this object, and these techniques are being used to identify the most distant galaxies detectable by JWST.
( Credit: NASA, ESA, CSA, and STScI)
Three similar, almost-as-distant galaxies
in the same field strengthen the observational case for this galaxy’s robustness.
The four most distant galaxies identified as part of JADES, thus far, include three that surpass the threshold for “most distant galaxy” previously set by Hubble. With no more than a quarter of the total JADES data taken thus far, this record will likely fall again, perhaps multiple times, over the coming months and years, but the unambiguous feature of the Lyman break can clearly be seen.
( Credit: NASA, ESA, CSA, M. Zamani (ESA/Webb), Leah Hustak (STScI); Science credit: Brant Robertson (UC Santa Cruz), S. Tacchella (Cambridge), E. Curtis-Lake (UOH), S. Carniani (Scuola Normale Superiore), JADES Collaboration)
is specifically designed to take advantage of JWST’s instrument’s unique capabilities.
This is a simulated JWST/NIRCam mosaic that was generated using JAGUAR and the NIRCam image simulator Guitarra, at the expected depth of the JADES Deep program. In the beginning of 2022, scientists noted that in its first year of science operations, JWST may break many records that Hubble set over the course of its 32 year (and counting) lifetime, including records for most distant galaxy and most distant star. The former has just fallen.
( Credit: C. Williams et al., ApJ, 2018)
With more observing time,
fainter and more distant galaxies will appear, smashing even this new record.
This animation showcases a portion of the Hubble eXtreme Deep Field, with 23 days of cumulative data, and a simulated view of what scientists expected JWST might see when it viewed this region. This simulation predates JWST’s launch, and has since been spectacularly superseded by actual JWST data.
Credit: NASA/ESA and Hubble/HUDF team; JADES collaboration for the NIRCam simulation
Mostly Mute Monday tells an astronomical story in images, visuals, and no more than 200 words. Talk less; smile more.