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.; Capak, P. L.; Riechers, D. A.; Benford, D. J.

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The IRAM/GISMO 2 mm Survey in the COSMOS Field

MPS-Authors

Magnelli, B.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Karim, A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Staguhn, J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kovács, A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jiménez-Andrade, E. F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Casey, C. M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zavala, J. A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Schinnerer, E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sargent, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Aravena, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bertoldi, F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Capak, P. L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Riechers, D. A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Benford, D. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2019ApJ...877...45M
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Citation

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.

Cite as: https://hdl.handle.net/21.11116/0000-0005-D080-E

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 ∼ 10^9.5 M _☉. They provide a relatively complete selection (∼66%) of the most luminous (L _IR > 10^12.6 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.