تقرير
The IRAM/GISMO two-millimeter survey in the COSMOS field
العنوان: | The IRAM/GISMO two-millimeter survey in the COSMOS field |
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المؤلفون: | 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. |
سنة النشر: | 2019 |
المجموعة: | Astrophysics |
مصطلحات موضوعية: | Astrophysics - Astrophysics of Galaxies |
الوصف: | We present deep continuum observations at a wavelength of 2mm centered on the COSMOS field using the Goddard IRAM Superconducting Millimeter Observer (GISMO) at the IRAM 30m-telescope. These data constitute the widest deep 2mm survey to-date, reaching a uniform $\sigma\sim0.23$mJy beam$^{-1}$ sensitivity over $\sim250$arcmin$^2$ at $\sim\,24''$ resolution. We detect four sources at high significance (S/N$\,\geq\,$4.4) with an expected number of false detection of 0.09 sources, and five sources at $4.4>\,$S/N$\,\geq\,3.7$ with an expected number of false detection of 1.65 sources. Combined with deep GISMO observations in GOODS-N, we constrain the 2mm number counts over one decade in flux density. These measurements agree with most galaxy evolution models tested here, except those with 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 $z\sim3$. These four high-redshift ($z>3$) galaxies have $\tilde{z}=3.9$, SFRs $\sim\,$400 - 1200M$_{\odot}\,$yr$^{-1}$ and $M_{\rm dust}\sim10^{9.5}\,$M$_{\odot}$. They provide a relatively complete selection ($\sim66\%$) of the most luminous ($L_{\rm IR}>10^{12.6}\,$L$_{\odot}$) and highest redshift ($z>3$) galaxies detected within our survey area by AzTEC at 1.1mm. We thus conclude that 2mm 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 ($\sim\,6.2\%$), for which the absence of a (sub-)millimeter counterpart supports a high redshift origin ($z\gtrsim3$). Comment: 27 pages, 14 figures, accepted for publication in ApJ |
نوع الوثيقة: | Working Paper |
DOI: | 10.3847/1538-4357/ab1912 |
URL الوصول: | http://arxiv.org/abs/1904.10006 |
رقم الأكسشن: | edsarx.1904.10006 |
قاعدة البيانات: | arXiv |
DOI: | 10.3847/1538-4357/ab1912 |
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