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The IRAM/GISMO 2 mm survey in the cOSMOS field

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posted on 2023-06-07, 06:35 authored by B Magnelli, A Karim, J Staguhn, A Kovács, E F Jiménez-Andrade, C M Casey, J A Zavala, E Schinnerer, Mark Sargent, M Aravena, F Bertoldi, P L Capack, D A Riechers, D J Benford
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 s ~ 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.

History

Publication status

  • Published

File Version

  • Accepted version

Journal

Astrophysical Journal

ISSN

0048-637X

Publisher

Institute of Physics

Issue

45

Volume

877

Page range

1-21

Department affiliated with

  • Physics and Astronomy Publications

Research groups affiliated with

  • Astronomy Centre Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2019-06-17

First Open Access (FOA) Date

2019-06-17

First Compliant Deposit (FCD) Date

2019-06-16

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