Dark progenitors and massive descendants: A first ALMA perspective on Radio-Selected NIRdark galaxies in the COSMOS field
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| Format: | Preprint |
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2024
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| author | Gentile, Fabrizio Talia, Margherita Daddi, Emanuele Giulietti, Marika Lapi, Andrea Massardi, Marcella Pozzi, Francesca Zamorani, Giovanni Behiri, Meriem Enia, Andrea Bethermin, Matthieu Dallacasa, Daniele Delvecchio, Ivan Faisst, Andreas L. Gruppioni, Carlotta Loiacono, Federica Traina, Alberto Vaccari, Mattia Vallini, Livia Vignali, Cristian Smolcic, Vernesa Cimatti, Andrea |
| author_facet | Gentile, Fabrizio Talia, Margherita Daddi, Emanuele Giulietti, Marika Lapi, Andrea Massardi, Marcella Pozzi, Francesca Zamorani, Giovanni Behiri, Meriem Enia, Andrea Bethermin, Matthieu Dallacasa, Daniele Delvecchio, Ivan Faisst, Andreas L. Gruppioni, Carlotta Loiacono, Federica Traina, Alberto Vaccari, Mattia Vallini, Livia Vignali, Cristian Smolcic, Vernesa Cimatti, Andrea |
| contents | We present the first spectroscopic ALMA follow-up for a pilot sample of nine Radio-Selected NIRdark galaxies in the COSMOS field. These sources were initially selected as radio-detected sources (S(3GHz)>12.65 uJy), lacking an optical/NIR counterpart in the COSMOS2015 catalog (Ks>24.7 mag), with just three of them subsequently detected in the deeper COSMOS2020. Several studies highlighted how this selection could provide a population of highly dust-obscured, massive, and star-bursting galaxies. With these new ALMA observations, we assess the spectroscopic redshifts of this pilot sample of sources and improve the quality of the physical properties estimated through SED-fitting. Moreover, we measure the quantity of molecular gas present inside these galaxies and forecast their potential evolutionary path, finding that the RS-NIRdark galaxies could represent a likely population of high-z progenitors of the massive and passive galaxies discovered at z~3. Finally, we present some initial constraints on the kinematics of the ISM within the analyzed galaxies, reporting a high fraction (~55%) of double-peaked lines that can be interpreted as the signature of a rotating structure in our targets or with the presence of major mergers in our sample. Our results presented in this paper showcase the scientific potential of (sub)mm observations for this elusive population of galaxies and highlight the potential contribution of these sources in the evolution of the massive and passive galaxies at high-z. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_05994 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Dark progenitors and massive descendants: A first ALMA perspective on Radio-Selected NIRdark galaxies in the COSMOS field Gentile, Fabrizio Talia, Margherita Daddi, Emanuele Giulietti, Marika Lapi, Andrea Massardi, Marcella Pozzi, Francesca Zamorani, Giovanni Behiri, Meriem Enia, Andrea Bethermin, Matthieu Dallacasa, Daniele Delvecchio, Ivan Faisst, Andreas L. Gruppioni, Carlotta Loiacono, Federica Traina, Alberto Vaccari, Mattia Vallini, Livia Vignali, Cristian Smolcic, Vernesa Cimatti, Andrea Astrophysics of Galaxies We present the first spectroscopic ALMA follow-up for a pilot sample of nine Radio-Selected NIRdark galaxies in the COSMOS field. These sources were initially selected as radio-detected sources (S(3GHz)>12.65 uJy), lacking an optical/NIR counterpart in the COSMOS2015 catalog (Ks>24.7 mag), with just three of them subsequently detected in the deeper COSMOS2020. Several studies highlighted how this selection could provide a population of highly dust-obscured, massive, and star-bursting galaxies. With these new ALMA observations, we assess the spectroscopic redshifts of this pilot sample of sources and improve the quality of the physical properties estimated through SED-fitting. Moreover, we measure the quantity of molecular gas present inside these galaxies and forecast their potential evolutionary path, finding that the RS-NIRdark galaxies could represent a likely population of high-z progenitors of the massive and passive galaxies discovered at z~3. Finally, we present some initial constraints on the kinematics of the ISM within the analyzed galaxies, reporting a high fraction (~55%) of double-peaked lines that can be interpreted as the signature of a rotating structure in our targets or with the presence of major mergers in our sample. Our results presented in this paper showcase the scientific potential of (sub)mm observations for this elusive population of galaxies and highlight the potential contribution of these sources in the evolution of the massive and passive galaxies at high-z. |
| title | Dark progenitors and massive descendants: A first ALMA perspective on Radio-Selected NIRdark galaxies in the COSMOS field |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2402.05994 |