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.
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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.
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.