HAL will be down for maintenance from Friday, June 10 at 4pm through Monday, June 13 at 9am. More information
Skip to Main content Skip to Navigation
Preprints, Working Papers, ...

The Atomic Hydrogen Content of Galaxies as a function of Group-Centric Radius

Abstract : We apply a spectral stacking technique to Westerbork Synthesis Radio Telescope observations to measure the neutral atomic hydrogen content (H) of nearby galaxies in and around galaxy groups at < 0.11. Our sample includes 577 optically-selected galaxies (120 isolated galaxies and 457 satellites) covering stellar masses between 10 10 and 10 11.5 M ⊙ , cross-matched with Yang's group catalogue, with angular and redshift positions from the Sloan Digital Sky Survey. We find that the satellites in the centres of groups have lower H masses at fixed stellar mass and morphology (characterised by the inverse concentration index) relative to those at larger radii. These trends persist for satellites in both high-mass (halo > 10 13.5 ℎ −1 M ⊙) and lowmass (halo 10 13.5 ℎ −1 M ⊙) groups, but disappear if we only consider group members in low local density (Σ < 5 gal/Mpc −2) environments. Similar trends are found for the specific star formation rate. Interestingly, we find that the radial trends of decreasing H mass with decreasing group-centric radius extend beyond the group virial radius, as isolated galaxies close to larger groups lack H compared with those located more than ∼3.0 180 away from the center of their nearest group. We also measure these trends in the late-type subsample and obtain similar results. Our results suggest that the H reservoir of galaxies can be affected before galaxies become group satellites, indicating the existence of pre-processing in the infalling isolated galaxies.
Document type :
Preprints, Working Papers, ...
Complete list of metadata

Contributor : Julien Caugant Connect in order to contact the contributor
Submitted on : Thursday, October 21, 2021 - 7:15:06 AM
Last modification on : Friday, October 22, 2021 - 3:17:43 AM
Long-term archiving on: : Saturday, January 22, 2022 - 6:17:00 PM


Files produced by the author(s)




Wenkai Hu, Luca Cortese, Lister Staveley-Smith, Barbara Catinella, Garima Chauhan, et al.. The Atomic Hydrogen Content of Galaxies as a function of Group-Centric Radius. 2021. ⟨hal-03389464⟩



Record views


Files downloads