TY - JOUR
T1 - Evidence for a gas-rich major merger in a proto-cluster at z = 2.5
AU - Tadaki, Ken Ichi
AU - Kodama, Tadayuki
AU - Tamura, Yoichi
AU - Hayashi, Masao
AU - Koyama, Yusei
AU - Shimakawa, Rhythm
AU - Tanaka, Ichi
AU - Kohno, Kotaro
AU - Hatsukade, Bunyo
AU - Suzuki, Kenta
PY - 2014/6/20
Y1 - 2014/6/20
N2 - Gas-rich major mergers in high-redshift proto-clusters are important events, perhaps leading to the creation of the slowly rotating remnants seen in the cores of clusters in the present day. Here, we present a deep Jansky Very Large Array observation of CO J = 1-0 emission line in a proto-cluster at z = 2.5, USS1558-003. The target field is an extremely dense region, where 20 Hα emitters (HAEs) are clustering. We have successfully detected the CO emission line from three HAEs and discovered a close pair of red and blue CO-emitting HAEs. Given their close proximity (30 kpc), small velocity offset (300 km s-1), and similar stellar masses, they could be in the early phase of a gas-rich major merger. For the red HAE, we derive a total infrared luminosity of L IR = 5.1 × 1012 L using MIPS 24 μm and radio continuum images. The ratio is significantly enhanced compared to local spirals and high-redshift disks with a similar CO luminosity, which is indicative of a starburst mode. We find the gas depletion timescale is shorter than that of normal star-forming galaxies regardless of adopted CO-H2 conversion factors. The identification of such a rare event suggests that gas-rich major mergers frequently take place in proto-clusters at z > 2 and may involve the formation processes of slow rotators seen in local massive clusters.
AB - Gas-rich major mergers in high-redshift proto-clusters are important events, perhaps leading to the creation of the slowly rotating remnants seen in the cores of clusters in the present day. Here, we present a deep Jansky Very Large Array observation of CO J = 1-0 emission line in a proto-cluster at z = 2.5, USS1558-003. The target field is an extremely dense region, where 20 Hα emitters (HAEs) are clustering. We have successfully detected the CO emission line from three HAEs and discovered a close pair of red and blue CO-emitting HAEs. Given their close proximity (30 kpc), small velocity offset (300 km s-1), and similar stellar masses, they could be in the early phase of a gas-rich major merger. For the red HAE, we derive a total infrared luminosity of L IR = 5.1 × 1012 L using MIPS 24 μm and radio continuum images. The ratio is significantly enhanced compared to local spirals and high-redshift disks with a similar CO luminosity, which is indicative of a starburst mode. We find the gas depletion timescale is shorter than that of normal star-forming galaxies regardless of adopted CO-H2 conversion factors. The identification of such a rare event suggests that gas-rich major mergers frequently take place in proto-clusters at z > 2 and may involve the formation processes of slow rotators seen in local massive clusters.
KW - galaxies: ISM
KW - galaxies: evolution
KW - galaxies: high-redshift
UR - http://www.scopus.com/inward/record.url?scp=84902199563&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84902199563&partnerID=8YFLogxK
U2 - 10.1088/2041-8205/788/2/L23
DO - 10.1088/2041-8205/788/2/L23
M3 - Article
AN - SCOPUS:84902199563
VL - 788
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - L23
ER -