4th of October 2016 |
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The response of CO to gas accretion in galaxies |
by Jing Wang (CASS) |
This figure, taken from
Cormier et al. (2016), shows
the optical image, CO image and CO spectrum for 2 of the HI-rich galaxies
from the
Bluedisk project. In total Cormier et al. have obtained CO images for 27
Bluedisk galaxies with the IRAM 30-m telescope.They compared the CO related
properties between HI-rich and control galaxies, searching for signs of
gas accretion. Surprisingly they find that HI-rich galaxies have similar
H2 masses as the control galaxies; and the HI-rich galaxies actually
have smaller H2 disks (normalised by R25) compared to
the control galaxies. The on-going gas accretion hence has not led to an
appreciable growth of the CO discs in the sample. Reference: D. Cormier, F. Bigiel, J. Wang, J. Pety, A. Usero, S. Roychowdhury, D. Carton, J. M. van der Hulst, G. I. G. Jozsa, M. Gonzales Garcia, A. Saintonge 2016, MNRAS, in press |