Universität zu Köln

Dasyra, Kalliopi M., Paraschos, Georgios F., Bisbas, Thomas G., Combes, Francoise ORCID: 0000-0003-2658-7893 and Antonio Fernandez-Ontiveros, Juan (2022). Insights into the collapse and expansion of molecular clouds in outflows from observable pressure gradients. Nat. Astron., 6 (9). S. 1077 - 1091. BERLIN: NATURE PORTFOLIO. ISSN 2397-3366

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Abstract

The jets launched by actively accreting black holes can generate massive outflows in galaxies, which could suppress or enhance star formation by rarefying or compressing clouds of molecular gas. To study the stability of such jet-impacted clouds, we performed astrochemical, thermally balanced, radiative transfer modelling of the CO and HCO+ emission of the galaxy IC 5063. We found that jet-related mechanical heating and cosmic rays contribute to the molecular gas heating rate and could even individually sustain it. Clouds excited by these mechanisms have temperatures and densities reflecting an order-of-magnitude increase in their internal pressure. Variations of their external pressure, deduced from [S ii] and [N ii] ionized gas emission, further reveal that some clouds are undergoing rarefaction and others compression. Our work shows a new viewpoint on plausible links between galactic outflows and star formation conditions: that of observable pressure gradients. It also emphasizes the role of cosmic rays in contributing to these gradients. Modelling of the gas excitation along the path of black hole jets suggests a more complex picture than previously expected, with the jet passage effecting pressure changes that could enhance or suppress star formation.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Dasyra, Kalliopi M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Paraschos, Georgios F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bisbas, Thomas G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Combes, Francoise UNSPECIFIED orcid.org/0000-0003-2658-7893 UNSPECIFIED Antonio Fernandez-Ontiveros, Juan UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-689896
DOI:	10.1038/s41550-022-01725-9
Journal or Publication Title:	Nat. Astron.
Volume:	6
Number:	9
Page Range:	S. 1077 - 1091
Date:	2022
Publisher:	NATURE PORTFOLIO
Place of Publication:	BERLIN
ISSN:	2397-3366
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language STAR-FORMATION; COSMIC-RAYS; INTERSTELLAR-MEDIUM; GALACTIC-CENTER; DIFFUSE CLOUDS; RADIO JET; MILKY-WAY; GAS; FEEDBACK; IONIZATION Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68989