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, Zavala, J A, Schinnerer, E, Sargent, M, Aravena, M, Bertoldi, F, Capack, P L, Riechers, D A and Benford, D J (2019) The IRAM/GISMO 2 mm survey in the cOSMOS field. Astrophysical Journal, 877 (45). pp. 1-21. ISSN 0048-637X

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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.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Research Centres and Groups: Astronomy Centre
Subjects: Q Science > QB Astronomy
Depositing User: Mark Sargent
Date Deposited: 17 Jun 2019 15:09
Last Modified: 01 Jul 2019 12:30

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