4th of August 2015 |
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An HI View of Galaxy Conformity: HI-rich Environment around HI-excess Galaxies |
by Jing Wang (CASS) |
We (J. Wang, P. Serra, B. Koribalski with
collaborators outside CASS) have developed a new technique to investigate HI
below the detection limit for individual sources in the interferometry data
(the paper is accepted for publication in MNRAS: astro-ph/1507.0850). We apply the technique to the
Bluedisk
data and find an excess of HI mass outside the detected galaxies in the
500 kpc environment around less massive and HI-rich central galaxies (in the
figure the blue shades are for low stellar mass and
low HI mass fraction and the red shades are for the high
stellar mass and high HI mass fraction). The "less massive" here refers to
the 10-10.5 dex Msun stellar mass range and "HI-rich" means having
a high HI mass at a fixed stellar mass or star formation rate properties in
the sample. The result is consistent with the picture of lambda-CDM predicted
cold-mode gas accretion for galaxies. Paper reference: J. Wang, Serra, Jozsa, Koribalski, van der Hulst, Kamphuis, Li, Fu, Overzier, Wieringa, E. Wang 2015, MNRAS, in press |