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  The IRAM/GISMO 2 mm Survey in the COSMOS Field

Magnelli, B., Karim, A., Staguhn, J., Kovács, A., Jiménez-Andrade, E. F., Casey, C. M., et al. (2019). The IRAM/GISMO 2 mm Survey in the COSMOS Field. The Astrophysical Journal, 877.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-D080-E Version Permalink: https://hdl.handle.net/21.11116/0000-0005-D081-D
Genre: Journal Article

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https://ui.adsabs.harvard.edu/abs/2019ApJ...877...45M (Any fulltext)
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 Creators:
Magnelli, B.1, Author
Karim, A.1, Author
Staguhn, J.1, Author
Kovács, A.1, Author
Jiménez-Andrade, E. F.1, Author
Casey, C. M.1, Author
Zavala, J. A.1, Author
Schinnerer, E.1, Author
Sargent, M.1, Author
Aravena, M.1, Author
Bertoldi, F.1, Author
Capak, P. L.1, Author
Riechers, D. A.1, Author
Benford, D. J.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: galaxies: evolution galaxies: formation galaxies: high-redshift galaxies: luminosity function mass function galaxies: photometry galaxies: starburst Astrophysics - Astrophysics of Galaxies
 Abstract: We present deep continuum observations at a wavelength of 2 mm centered on the COSMOS field using the Goddard IRAM Superconducting Millimeter Observer (GISMO) at the IRAM 30 m telescope. These data constitute the widest deep 2 mm survey to date, reaching a uniform σ ∼ 0.23 mJy beam−1 sensitivity over ∼250 arcmin2 at ∼24″ resolution. We detect four sources at high significance (S/N ≥ 4.4) with an expected number of false detections of 0.09 sources and five sources at 4.4 > S/N ≥ 3.7 with an expected number of false detections of 1.65 sources. Combined with deep GISMO observations in GOODS-N, we constrain the 2 mm number counts over one decade in flux density. These measurements agree with most galaxy evolution models tested here, except those with a large population of dusty star-forming galaxies at z > 7. Five GISMO sources have counterparts in (sub)millimeter catalogs available in COSMOS. Their redshifts suggest that all but one lie above z ∼ 3. These four high-redshift (z > 3) galaxies have \tilde{z} = 3.9, SFRs ∼ 400─1200 M ☉ yr−1, and M dust ∼ 109.5 M ☉. They provide a relatively complete selection (∼66%) of the most luminous (L IR > 1012.6 L ☉) and highest- redshift (z > 3) galaxies detected within our survey area by AzTEC at 1.1 mm. We thus conclude that 2 mm surveys favor the selection of massive, vigorously star-forming, high-redshift galaxies. This is corroborated by GISMO-C4, a source with a low false-detection probability (∼6.2%), for which the absence of a (sub)millimeter counterpart supports a high-redshift origin (z ≳ 3). Based on observations with the IRAM 30 m telescope.

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 Dates: 2019
 Publication Status: Issued
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 877 Sequence Number: - Start / End Page: - Identifier: -