A Cosmic Miracle: A Remarkably Luminous Galaxy at z_\rmspec=14.44 Confirmed with JWST
2025/05/16 by Rohan P. Naidu, Pascal A. Oesch, Naidu, Rohan P. +89 · 17 voices · 12 citations
#astro-ph.GA #astro-ph.CO #astro-ph.SR
paper · pdf · doi:10.48550/arxiv.2505.11263
Abstract
JWST has revealed a stunning population of bright galaxies at surprisingly early epochs, z>10, where few such sources were expected. Here we present the most distant example of this class yet -- MoM-z14, a luminous (M_\rmUV=-20.2) source in the COSMOS field at z_\rmspec=14.44+0.02-0.02 that expands the observational frontier to a mere 280 million years after the Big Bang. The redshift is confirmed with NIRSpec/PRISM spectroscopy through a sharp Lyman-α break and ∼3σ detections of five rest-UV emission lines. The number density of bright z_\rmspec∼14-15 sources implied by our "Mirage or Miracle" survey spanning ∼350 arcmin2 is >100× larger (182+329-105×) than pre-JWST consensus models. The high EWs of UV lines (∼15-35 Å) signal a rising star-formation history, with a ∼10× increase in the last 5 Myr (\rmSFR_\rm5Myr/\rmSFR_\rm50Myr=9.9+3.0-5.8). The source is extremely compact (circularized r_\rme = 74+15-12 pc), and yet elongated (b/a=0.25+0.11-0.06), suggesting an AGN is not the dominant source of UV light. The steep UV slope (β=-2.5+0.2-0.2) implies negligible dust attenuation and a young stellar population. The absence of a strong damping wing provides tentative evidence that the immediate surroundings of MoM-z14 may be partially ionized at a redshift where virtually every reionization model predicts a ∼100% neutral fraction. The nitrogen emission and highly super-solar [N/C]>1 hint at an abundance pattern similar to local globular clusters that may have once hosted luminous supermassive stars. Since this abundance pattern is also common among the most ancient stars born in the Milky Way, we may be directly witnessing the formation of such stars in dense clusters, connecting galaxy evolution across the entire sweep of cosmic time.
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- 🧵 Here is MoM-z14, the most distant galaxy spectroscopically confirmed to date. It is an extraordinarily luminous galaxy, discovered by a research team using #JWST, which has broken its previous reco [bsky, 83 points, 3 comments]
- A new record holder for the earliest-known / most distant galaxy, from @rpnaidu.bsky.social! It’s at redshift 14.4, or 280 million years after the Big Bang. It’s also remarkably bright & compact. The [bsky, 60 points, 2 comments]
- We found the most distant confirmed galaxy (some Sergej Boebka vibes 😅) arxiv.org/abs/2505.11263 [bsky, 48 points, 0 comments]
- This may not be obvious, but a paper like the Naidu et al on the new distance record holder galaxy arxiv.org/abs/2505.11263 would normally be submitted to Nature. The fact that it was submitted to the [bsky, 38 points, 2 comments]
- I said the most distant galaxy at a redshift of 14.2 would probably not own the record for long... I love being right ☺️ arxiv.org/abs/2505.11263 [bsky, 17 points, 1 comments]
- JWST has extended the cosmic frontier to z=14.44, a new record for the most distant galaxy. The paper led by @rpnaidu.bsky.social is on the arXiv arxiv.org/abs/2505.11263 [bsky, 9 points, 1 comments]
- That’s a pretty cool result: JWST reveals, in both imaging and spectroscopy, the farthest ever detected galaxy: MoM-z14 at z_spec =14.44. Congrats for this great work ! arxiv.org/abs/2505.11263 by Nai [bsky, 9 points, 1 comments]
- A new title holder of the most distant galaxy - MoM-z14, which existed a mere 280 million years after the Big Bang, with a redshift value z = 14.44. The redshift was confirmed with JWST NIRSpec/prism [bsky, 9 points, 0 comments]
- Michelle then moved to the spectroscopic confirmation of galaxy MoM-z14, which has redshift of z=14.44 from JWST! This implies that there may be 100x more massive, bright galaxies at z~14 than expecte [bsky, 7 points, 0 comments]
- #arXiv A Cosmic Miracle: A Remarkably Luminous Galaxy at z=14.44 Confirmed with JWST arxiv.org/abs/2505.11263 "The redshift is confirmed with NIRSpec/prism spectroscopy through a sharp Lyman- break an [bsky, 6 points, 2 comments]
- A Remarkably Luminous Galaxy at Zspec = 14.44 Confirmed with JWST [hn, 3 points, 1 comments]
- More sources: arxiv.org/abs/2505.11263 www.youtube.com/watch?v=KFgw... www.youtube.com/watch?v=W7Pg... [bsky, 1 points, 0 comments]
- None of my publications has "miracle" in the title, nor any of these terms in the abstract: surprisingly early epochs expands the observational frontier extremely compact, and yet resolved hint at an [bsky, 0 points, 0 comments]
- arxiv.org/pdf/2505.11263 Pre print for post above . See Lyman-alpha break below ..! Wowsers ..!! [bsky, 0 points, 0 comments]
- # arXiv A Cosmic Miracle: A Remarkably Luminous Galaxy at z=14.44 Confirmed with JWST https:// arxiv.org/abs/2505.11263 "The redshift is confirmed with NIRSpec/prism spectroscopy through a sharp Lyman [mastodon, 0 points, 0 comments]
- 🚨 New record! JWST spots a galaxy at z = 14.44 — the highest redshift ever seen. We're now looking just 280 million years after the Big Bang. arxiv.org/abs/2505.11263 #JWST #Redshift #Astronomy [bsky, 0 points, 0 comments]
- A Remarkably Luminous Galaxy at z_spec = 14.44 Confirmed with JWST: arxiv.org/abs/2505.11263 -> "MoM-z14 [...] expands the observational frontier to a mere 280 million years after the Big Bang. The re [bsky, 0 points, 0 comments]
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