Universität zu Köln

Rybak, M., Hodge, J. A., Greve, T. R., Riechers, D., Lamperti, I, van Marrewijk, J., Walter, F., Wagg, J. and van der Werf, P. P. (2022). PRUSSIC I. A JVLA survey of HCN, HCO+, and HNC (1-0) emission in z similar to 3 dusty galaxies: Low dense-gas fractions in high-redshift star-forming galaxies. Astron. Astrophys., 667. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Dusty star-forming galaxies (DSFGs) at redshift z >= 1 are among the most vigorously star-forming galaxies in the Universe. However, their dense (>= 10(5) cm(-3)) gas phase - typically traced by HCN(1-0) - remains almost entirely unexplored: only two DSFGs have been detected in HCN(1-0) to date. We present the results of a Karl G. Jansky Very Large Array survey of the J = 1-0 transition of HCN, HCO+, and HNC(1-0) in six strongly lensed DSFGs at z = 2:5 3:3, e ffectively doubling the number of DSFGs with deep observations of these lines. We detect HCN(1-0) emission in one source (J1202 +5354, 4.6 sigma), with a tentative HCO+(1-0) detection in another (J1609 +6045, 3.3 sigma). Spectral stacking yields strict upper limits on the HCN /FIR (<= 3:6 x 10(-4)) and HCN /CO(1-0) ratios (<= 0.045). The inferred HCN /FIR ratios (a proxy for the star-formation e fficiency) are consistent with those in z similar to 0 far-infrared-luminous starbursts. However, the HCN /CO ratios - a proxy for the dense-gas fraction - are a factor of a few lower than suggested by the two previous DSFG detections. Our results imply that most DSFGs have low dense-gas fractions. A comparison with theoretical models of star-forming galaxies indicates that the bulk of gas in DSFGs is at lower densities (approximate to 10(2) cm(-3)), similar to 'normal' star-forming galaxies, rather than ultraluminous starbursts.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Rybak, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hodge, J. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Greve, T. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Riechers, D. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lamperti, I UNSPECIFIED UNSPECIFIED UNSPECIFIED van Marrewijk, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Walter, F. UNSPECIFIED UNSPECIFIED UNSPECIFIED Wagg, J. UNSPECIFIED UNSPECIFIED UNSPECIFIED van der Werf, P. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-692136
DOI:	10.1051/0004-6361/202243894
Journal or Publication Title:	Astron. Astrophys.
Volume:	667
Date:	2022
Publisher:	EDP SCIENCES S A
Place of Publication:	LES ULIS CEDEX A
ISSN:	1432-0746
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language GRAVITATIONALLY LENSED GALAXIES; MOLECULAR GAS; SUBMILLIMETER GALAXIES; INTERSTELLAR-MEDIUM; QUASAR HOST; PIXELATED RECONSTRUCTION; FORMATION EFFICIENCY; STARBURST GALAXIES; INFRARED GALAXIES; KILOPARSEC-SCALE Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/69213