University of Hertfordshire

From the same journal

From the same journal

By the same authors


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    Accepted author manuscript, 3 MB, PDF-document


  • Angus Mok
  • C. D. Wilson
  • Johan Knapen
  • J. R. Sanchez-Gallego
  • Elias Brinks
  • E. Rosolowsky
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Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Journal publication date7 Feb 2017
StateAccepted/In press - 7 Feb 2017


We present an analysis of the radial profiles of a sample of 43 HI-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) HI maps. Comparing the Virgo and non-Virgo populations, we confirm that the HI disks are truncated in the Virgo sample, even for these relatively HI-rich galaxies. On the other hand, the H$_{2}$ distribution is enhanced for Virgo galaxies near their centres, resulting in higher H$_{2}$ to HI ratios and steeper H$_{2}$ 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 H$\alpha$ star formation rate data, we find that the star formation efficiency (SFR/H$_{2}$) is relatively constant with radius for both samples, but Virgo galaxies have a $\sim40\%$ lower star formation efficiency than non-Virgo galaxies.


Accepted for publication in MNRAS, 12 pages, 6 figures


ID: 11163732