Is atomic carbon a good tracer of molecular gas in metal-poor galaxies?

Glover, Simon C. O. and Clark, Paul C. ORCID: https://orcid.org/0000-0002-4834-043X 2016. Is atomic carbon a good tracer of molecular gas in metal-poor galaxies? Monthly Notices of the Royal Astronomical Society 456 (4) , pp. 3596-3609. 10.1093/mnras/stv2863

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Abstract

Carbon monoxide (CO) is widely used as a tracer of molecular hydrogen (H2) in metal-rich galaxies, but is known to become ineffective in low-metallicity dwarf galaxies. Atomic carbon has been suggested as a superior tracer of H2 in these metal-poor systems, but its suitability remains unproven. To help us to assess how well atomic carbon traces H2 at low metallicity, we have performed a series of numerical simulations of turbulent molecular clouds that cover a wide range of different metallicities. Our simulations demonstrate that in star-forming clouds, the conversion factor between [C I] emission and H2 mass, XCI, scales approximately as XCI ∝ Z−1. We recover a similar scaling for the CO-to-H2 conversion factor, XCO, but find that at this point in the evolution of the clouds, XCO is consistently smaller than XCI, by a factor of a few or more. We have also examined how XCI and XCO evolve with time. We find that XCI does not vary strongly with time, demonstrating that atomic carbon remains a good tracer of H2 in metal-poor systems even at times significantly before the onset of star formation. On the other hand, XCO varies very strongly with time in metal-poor clouds, showing that CO does not trace H2 well in starless clouds at low metallicity.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Publisher:	Oxford University Press
ISSN:	0035-8711
Date of First Compliant Deposit:	8 November 2018
Date of Acceptance:	4 December 2015
Last Modified:	06 May 2023 03:35
URI:	https://orca.cardiff.ac.uk/id/eprint/89650

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