COSMOS2020: A Panchromatic View of the Universe to z ∼ 10 from Two Complementary Catalogs

By J. Weaver, O. Kauffmann, O. Ilbert, H. McCracken, A. Moneti, S. Toft, G. Brammer, M. Shuntov, I. Davidzon, B. Hsieh and 48 more. Astrophysical Journal Supplement Series, 2021

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The Cosmic Evolution Survey (COSMOS) has become a cornerstone of extragalactic astronomy. Since the last public catalog in 2015, a wealth of new imaging and spectroscopic data have been collected in the COSMOS field. This paper describes the collection, processing, and analysis of these new imaging data to produce a new reference photometric redshift catalog. Source detection and multiwavelength photometry are performed for 1.7 million sources across the 2 deg2 of the COSMOS field, ∼966,000 of which are measured with all available broadband data using both traditional aperture photometric methods and a new profile-fitting photometric extraction tool, The Farmer, which we have developed. A detailed comparison of the two resulting photometric catalogs is presented. Photometric redshifts are computed for all sources in each catalog utilizing two independent photometric redshift codes. Finally, a comparison is made between the performance of the photometric methodologies and of the redshift codes to demonstrate an exceptional degree of self-consistency in the resulting photometric redshifts. The i < 21 sources have subpercent photometric redshift accuracy and even the faintest sources at 25 < i < 27 reach a precision of 5%. Finally, these results are discussed in the context of previous, current, and future surveys in the COSMOS field. Compared to COSMOS2015, it reaches the same photometric redshift precision at almost one magnitude deeper. Both photometric catalogs and their photometric redshift solutions and physical parameters will be made available through the usual astronomical archive systems (ESO Phase 3, IPAC-IRSA, and CDS).

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/0f7b7664838ba86e421ec980114f2032fe388d39

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Citations in the corpus

The evolution of the galaxy UV luminosity function at redshifts z ≃ 8 – 15 from deep JWST and ground-based near-infrared imaging (2022, methodology): “Therefore, to avoid these artefacts we developed a mask based on the positions of all the bright stars in the image from the COSMOS 2020 bright stars mask (Weaver et al. 2022).”
A Census of Photometrically Selected Little Red Dots at 4 < z < 9 in JWST Blank Fields (2024, methodology): “This method was shown to apply to both point-like and extended objects (Weaver et al. 2022, 2023b), so we believe it to be adequate for our sources.”
The Early Data Release of the Dark Energy Spectroscopic Instrument (2023, methodology): “The cool gas galaxy counterparts are selected from the COSMOS2020 catalog ( Weaver et al. 2022 ) .”