Jeyhan Kartaltepe

I'm traveling through space!!

COSMOS-Web opens window into universe for scientists and citizens Supported by RIT’s Jeyhan Kartaltepe, COSMOS-Web—the largest JWST Cycle 1 observation program— has made its full data set publicly available.

The international NASA's James Webb Space Telescope COSMOS-Web team, led by @ritscience.bsky.social researchers, has made an unprecedented amount of information available for future discovery! Explore the largest view deep into the #universe through a searchable catalog now available to the public.

COSMOS-Web Unveils Largest Look Ever Into the Deep Universe <p dir="ltr" style="line-height:1.38;margin-top:12pt;margin-bottom:12pt;"> <span id="docs-internal-guid-d4030318-7fff-9478-cbb1-8acda9325dcb"><a href="https://cosmos.astro.caltech.edu/page/cosmosweb"...

Check out our team's coordinated press release and reach out if you have any questions about the data!

cosmos.astro.caltech.edu/news/87

Our release includes an interactive viewer where you can explore the images, display the spectroscopic redshifts (Khostovan et al. 2025) and information from the photometric catalog (including their full SED, photometric redshift, the cutout images in each filter, and the zPDF).

COSMOS2025: The COSMOS-Web galaxy catalog of photometry, morphology, redshifts, and physical parameters from JWST, HST, and ground-based imaging We present COSMOS2025, the COSMOS-Web catalog of photometry, morphology, photometric redshifts and physical parameters for more than 700,000 galaxies in the Cosmic Evolution Survey (COSMOS) field. Thi...

And finally, Shuntov et al. present the catalog, including photometric measurements in 37 bands (including #jwst, #hst, #spitzer, and ground-based telescopes), physical parameters (like redshift and stellar mass), and morphological parameters.
arxiv.org/abs/2506.03243

Then, Harish et al. describe the MIRI data reduction and present the galaxy number counts. arxiv.org/abs/2506.03306

Along with the data, we have released three papers describing the data reduction and catalog process.

First, Franco et al. describe the NIRCam data reduction process and challenges for handling a dataset of this size. arxiv.org/abs/2506.03256

It's finally here! We've just released all of our COSMOS-Web images and catalogs, along with an interactive viewer where you can explore the data! Check it out at: cosmos2025.iap.fr

YouTube video by Space Telescope Science Institute The James Webb Space Telescope Reveals the Early Universe

Recap some of #NASAWebb’s biggest early-universe discoveries (so far) with the astronomers who are doing the science. 🔭 🧪

Ali Ahmad Khostovan, et al.: COSMOS Spectroscopic Redshift Compilation (First Data Release): 165k Redshifts Encompassing Two Decades of Spectroscopy https://arxiv.org/abs/2503.00120 https://arxiv.org/pdf/2503.00120 https://arxiv.org/html/2503.00120

My PhD student Rohan Pattnaik's first paper on the machine learning tool he developed to automatically measure redshifts directly from galaxy spectra, SpecPT, is now out. The results are have surpassed my expectations and I can't wait until we extend this to other datasets!
arxiv.org/abs/2501.01070

Here’s Joel Achenbach for the Washington Post on JWST’s first year with nice quotes from @janerigby.bsky.social, @jeyhan.bsky.social, @saturnswings.bsky.social and many more! https://www.washingtonpost.com/science/2023/07/12/jwst-new-picture-first-year/

This 3D visualization portrays about 5,000 galaxies within a small portion of the CEERS (Cosmic Evolution Early Release Science) Survey, which gathered data ... CEERS: Flight to Maisie's Galaxy

Second galaxy to the right and straight on until cosmic dawn! This video takes you on a journey through our CEERS JWST images and cosmic history. Every second we travel 200 Million lightyears into the past on our way to Maisie's Galaxy which existed ~13.4 Billion years ago!

Ok, I do love that with very little effort, I have a feed for Cat pics!

Good to know the tricks! Thanks!

RIT researchers discover most distant active black hole ever RIT astrophysicists lead the James Webb Space Telescope team in discovering most distant active black hole ever found.

And here is a link to RIT's press release:

Webb Detects Most Distant Active Supermassive Black Hole to Date Researchers have discovered the most distant active supermassive black hole to date with the James Webb Space Telescope. The galaxy, CEERS 1019, existed just over 570 million years after the big bang,...

First post! Let's kick things off with our #JWST NASA press release today on high redshift galaxies in the CEERS Survey, and highlighting work from @saturnswings.bsky.social