Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 897, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/ab9f3b
Keywords
Disk galaxies; Galaxy clusters; Molecular gas
Categories
Funding
- ASI-INAF [2017-14-H.0]
- INAF main-stream funding program
- European Research Council (ERC) [833824, 679627]
- European Organisation for Astronomical Research in the Southern Hemisphere under ESO program [196.B-0578]
- European Research Council (ERC) [833824] Funding Source: European Research Council (ERC)
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In the disks of four jellyfish galaxies from the GASP sample at redshift similar to 0.05 we detect molecular gas masses systematically higher than in field galaxies. These galaxies are being stripped of their gas by ram pressure from the intracluster medium and are, in general, forming stars at a high rate with respect to nonstripped galaxies of similar stellar masses. We find that, unless giant molecular clouds in the disk are unbound by ram pressure leading to exceptionally high CO-to-H(2)conversion factors, these galaxies have a molecular gas content 4-5 times higher than normal galaxies of similar masses, and molecular gas depletion times ranging from similar to 1 to 9 Gyr, corresponding to generally very low star formation efficiencies. The molecular gas mass within the disk is a factor between 4 and similar to 100 times higher than the neutral gas mass, as opposed to the disks of normal spirals that contain similar amounts of molecular and neutral gas. Intriguingly, the molecular plus neutral total amount of gas is similar to that in normal spiral galaxies of similar stellar mass. These results strongly suggest that ram pressure in disks of galaxies during the jellyfish phase leads to a very efficient conversion of Hiinto H-2.
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