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ALMA view of a massive spheroid progenitor: a compact rotating core of molecular gas in an AGN host at z=2.226
Stockholm University, Nordic Institute for Theoretical Physics (Nordita).
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Number of Authors: 192018 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 476, no 3, p. 3956-3963Article in journal (Refereed) Published
Abstract [en]

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 active galactic nucleus (AGN) that has been proposed as a progenitor of compact quiescent galaxies (QGs). 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 (similar to 1 kpc). This result, coupled with a very high interstellar medium (ISM) density (n similar to 10(5.5) cm(-3)), a low gas mass fraction (similar to 0.2), and a short gas depletion time-scale (similar to 150 Myr), implies 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(-53)(+92) 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.

Place, publisher, year, edition, pages
2018. Vol. 476, no 3, p. 3956-3963
Keywords [en]
ISM: kinematics and dynamics, galaxies: active, galaxies: evolution, galaxies: high-redshift
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-156639DOI: 10.1093/mnras/sty481ISI: 000430944100072OAI: oai:DiVA.org:su-156639DiVA, id: diva2:1215389
Available from: 2018-06-08 Created: 2018-06-08 Last updated: 2018-06-08Bibliographically approved

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Vallini, LiviaLiuzzo, E.
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