ALMA view of a massive spheroid progenitor : a compact rotating core of molecular gas in an AGN host at z=2.226
| Autor: | Margherita Talia, Filippo Fraternali, G. Rodighiero, G. Zamorani, Livia Vallini, Lucia Pozzetti, Elisabetta Liuzzo, C. Vignali, Carlotta Gruppioni, M. Mignoli, Emanuele Daddi, Francesca Pozzi, Edo Ibar, Ivan Delvecchio, Paolo Cassata, Alvio Renzini, Andrea Cimatti, Marcella Brusa, Marcella Massardi |
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| Přispěvatelé: | Talia, M., Pozzi, F., Vallini, L., Cimatti, A., Cassata, P., Fraternali, F., Brusa, M., Daddi, E., Delvecchio, I., Ibar, E., Liuzzo, E., Vignali, C., Massardi, M., Zamorani, G., Gruppioni, C., Renzini, A., Mignoli, M., Pozzetti, L., Rodighiero, G., Talia M., Pozzi F. , Vallini L., Cimatti A., Cassata P., Fraternali F., Brusa M., Daddi E., Delvecchio I., Ibar E., Liuzzo E., Vignali C., Massardi M., Zamorani, G., Gruppioni C., Renzini A., Mignoli M., Pozzetti L., Rodighiero G., Astronomy |
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
ISM: kinematics and dynamics
galaxies: active galaxies: evolution galaxies: high-redshift Active galactic nucleus active [Galaxies] galaxies: active FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences high-redshift [Galaxies] Settore FIS/05 - Astronomia e Astrofisica galaxies: high-redshift ISM: kinematics and dynamic 0103 physical sciences 010303 astronomy & astrophysics Astrophysics::Galaxy Astrophysics Physics ISM: kinematics and dynamics 010308 nuclear & particles physics ISM: kinematics and dynamics galaxies: active galaxies: evolution galaxies: high-redshift Astrophysics - Astrophysics of Galaxies Spheroid Astronomy and Astrophysics evolution [Galaxies] Astrophysics - Astrophysics of Galaxies Galaxy Core (optical fiber) kinematics and dynamics [ISM] Space and Planetary Science Astrophysics of Galaxies (astro-ph.GA) galaxies: evolution |
| Zdroj: | Monthly Notices of the Royal Astronomical Society, 476(3), 3956-3963. Oxford University Press |
| ISSN: | 0035-8711 |
| Popis: | We present ALMA observations at 107.291 GHz (band 3) and 214.532 GHz (band 6) of GMASS 0953, a star-forming galaxy at z=2.226 hosting an obscured AGN that has been proposed as a progenitor of compact quiescent galaxies (QG). We measure for the first time the size of the dust and molecular gas emission of GMASS 0953 that we find to be extremely compact ($\sim$1 kpc). This result, coupled with a very high ISM density (n$\sim$10$^{5.5}$ cm$^{-3}$), a low gas mass fraction ($\sim$0.2) and a short gas depletion timescale ($\sim$150 Myr) imply that GMASS 0953 is experiencing an episode of intense star-formation in its central region that will rapidly exhaust its gas reservoirs, likely aided by AGN-induced feedback, confirming its fate as a compact QG. Kinematic analysis of the CO(6-5) line shows evidence of rapidly-rotating gas ($V_{rot}$=320$^{+92}_{-53}$ km s$^{-1}$), as observed also in a handful of similar sources at the same redshift. On-going quenching mechanisms could either destroy the rotation or leave it intact leading the galaxy to evolve into a rotating QG. MNRAS in press, 8 pages, 8 figures |
| Databáze: | OpenAIRE |
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