Abstract
We present an analysis of the radial profiles of a sample of 43 H I-flux selected spiral galaxies from the Nearby Galaxies Legacy Survey (NGLS) with resolved James Clerk Maxwell Telescope (JCMT) CO J = 3 − 2 and/or Very Large Array (VLA) H I maps. Comparing the Virgo and non-Virgo populations, we confirm that the H i discs are truncated in the Virgo sample, even for these relatively H i-rich galaxies. On the other hand, the H2 distribution is enhanced for the Virgo galaxies near their centres, resulting in higher H2 to H I ratios and steeper H2 and total gas radial profiles. This is likely due to the effects of moderate ram pressure stripping in the cluster environment, which would preferentially remove low-density gas in the outskirts while enhancing higher density gas near the centre. Combined with Hα star formation rate data, we find that the star formation efficiency (SFR/H2) is relatively constant with radius for both samples, but the Virgo galaxies have an ∼40 per cent lower star formation efficiency than the non-Virgo galaxies.
Document Type
Article
Publication Date
2-9-2017
Digital Object Identifier (DOI)
https://doi.org/10.1093/mnras/stx345
Funding Information
The research of CDW is supported by grants from NSERC (Canada). JHK acknowledges financial support from the Spanish Ministry of Economy and Competitiveness (MINECO) under grant number AYA2013-41243-P. EB acknowledges support from the UK Science and Technology Facilities Council [grant number ST/M001008/1].
Due to the large number of funding sources, only the first few are listed in this section. For the complete list of funding sources, please download this article.
Repository Citation
Mok, Angus; Wilson, C. D.; Knapen, J. H.; Sánchez-Gallego, José R.; Brinks, E.; and Rosolowsky, E., "The JCMT Nearby Galaxies Legacy Survey – XI. Environmental Variations in the Atomic and Molecular Gas Radial Profiles of Nearby Galaxies" (2017). Physics and Astronomy Faculty Publications. 560.
https://uknowledge.uky.edu/physastron_facpub/560
Notes/Citation Information
Published in Monthly Notices of the Royal Astronomical Society, v. 467, issue 4, p. 4282-4292.
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
The copyright holders have granted the permission for posting the article here.