Rights statement: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Andra Stroe, Tom Oosterloo, Huub J. A. Röttgering, David Sobral, Reinout van Weeren, and William Dawson Neutral hydrogen gas, past and future star formation in galaxies in and around the ‘Sausage’ merging galaxy cluster MNRAS (September 21, 2015) Vol. 452 2731-2744 doi:10.1093/mnras/stv1462 First published online July 25, 2015
Accepted author manuscript, 881 KB, PDF document
Final published version
Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Neutral hydrogen gas, past and future star formation in galaxies in and around the 'Sausage' merging galaxy cluster
AU - Stroe, Andra
AU - Oosterloo, Tom
AU - Röttgering, Huub J A
AU - Sobral, David
AU - van Weeren, Reinout
AU - Dawson, William
N1 - This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The definitive publisher-authenticated version Andra Stroe, Tom Oosterloo, Huub J. A. Röttgering, David Sobral, Reinout van Weeren, and William Dawson Neutral hydrogen gas, past and future star formation in galaxies in and around the ‘Sausage’ merging galaxy cluster MNRAS (September 21, 2015) Vol. 452 2731-2744 doi:10.1093/mnras/stv1462 First published online July 25, 2015
PY - 2015/9/21
Y1 - 2015/9/21
N2 - CIZA J2242.8+5301 (z=0.188, nicknamed 'Sausage') is an extremely massive (M200 ~2.0 × 1015 M⊙), merging cluster with shock waves towards its outskirts, which was found to host numerous emission line galaxies. We performed extremely deep Westerbork Synthesis Radio Telescope HI observations of the 'Sausage' cluster to investigate the effect of the merger and the shocks on the gas reservoirs fuelling present and future star formation (SF) in cluster members. By using spectral stacking, we find that the emission line galaxies in the 'Sausage' cluster have, on average, as much HI gas as field galaxies (when accounting for the fact cluster galaxies are more massive than the field galaxies), contrary to previous studies. Since the cluster galaxies are more massive than the field spirals, they may have been able to retain their gas during the cluster merger. The large HI reservoirs are expected to be consumed within ~0.75-1.0 Gyr by the vigorous SF and active galactic nuclei activity and/or driven out by the outflows we observe. We find that the star formation rate (SFR) in a large fraction of Hα emission line cluster galaxies correlates well with the radio broad-band emission, tracing supernova remnant emission. This suggests that the cluster galaxies, all located in post-shock regions, may have been undergoing sustained SFR for at least 100 Myr. This fully supports the interpretation proposed by Stroe et al. and Sobral et al. that gas-rich cluster galaxies have been triggered to form stars by the passage of the shock.
AB - CIZA J2242.8+5301 (z=0.188, nicknamed 'Sausage') is an extremely massive (M200 ~2.0 × 1015 M⊙), merging cluster with shock waves towards its outskirts, which was found to host numerous emission line galaxies. We performed extremely deep Westerbork Synthesis Radio Telescope HI observations of the 'Sausage' cluster to investigate the effect of the merger and the shocks on the gas reservoirs fuelling present and future star formation (SF) in cluster members. By using spectral stacking, we find that the emission line galaxies in the 'Sausage' cluster have, on average, as much HI gas as field galaxies (when accounting for the fact cluster galaxies are more massive than the field galaxies), contrary to previous studies. Since the cluster galaxies are more massive than the field spirals, they may have been able to retain their gas during the cluster merger. The large HI reservoirs are expected to be consumed within ~0.75-1.0 Gyr by the vigorous SF and active galactic nuclei activity and/or driven out by the outflows we observe. We find that the star formation rate (SFR) in a large fraction of Hα emission line cluster galaxies correlates well with the radio broad-band emission, tracing supernova remnant emission. This suggests that the cluster galaxies, all located in post-shock regions, may have been undergoing sustained SFR for at least 100 Myr. This fully supports the interpretation proposed by Stroe et al. and Sobral et al. that gas-rich cluster galaxies have been triggered to form stars by the passage of the shock.
KW - Galaxies: active
KW - Galaxies: clusters: individual: CIZA J2242.8+ 5301
KW - Radio continuum: galaxies
KW - Radio lines: galaxies
KW - Shock waves
U2 - 10.1093/mnras/stv1462
DO - 10.1093/mnras/stv1462
M3 - Journal article
AN - SCOPUS:84945295578
VL - 452
SP - 2731
EP - 2744
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
SN - 0035-8711
IS - 3
ER -