Bibcode
Mok, Angus; Wilson, C. D.; Knapen, J. H.; Sánchez-Gallego, J. R.; Brinks, E.; Rosolowsky, E.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 467, Issue 4, p.4282-4292
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6
2017
Citations
25
Refereed citations
24
Description
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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