TY - JOUR
T1 - MIGHTEE-HI : discovery of an H I-rich galaxy group at z = 0.044 with MeerKAT
AU - Ranchod, Shilpa
AU - Deane, Roger P.
AU - Ponomareva, Anastasia A.
AU - Blecher, Tariq
AU - Frank, Bradley S.
AU - Jarvis, Matt J.
AU - Maddox, Natasha
AU - Mulaudzi, Wanga
AU - Glowacki, Marcin
AU - Hess, Kelley M.
AU - Tudorache, Madalina
AU - Verdes-Montenegro, Lourdes
AU - Adams, Nathan J.
AU - Bowler, Rebecca A. A.
AU - Collier, Jordan D.
AU - Taylor, Russ
PY - 2021
Y1 - 2021
N2 - We present the serendipitous discovery of a galaxy group in the XMM-LSS field with MIGHTEE Early Science observations. 20 galaxies are detected in H i in this z ∼0.044 group, with a 3σ column density sensitivity of NHI = 1.6 à1020 cm-2. This group has not been previously identified, despite residing in a well-studied extragalactic legacy field. We present spatially resolved H i total intensity and velocity maps for each of the objects which reveal environmental influence through disturbed morphologies. The group has a dynamical mass of log10(Mdyn/M⊙) = 12.32, and is unusually gas-rich, with an H i-to-stellar mass ratio of log10(f∗HI) = -0.2, which is 0.7 dex greater than expected. The group's high H i content, spatial, velocity, and identified galaxy type distributions strongly suggest that it is in the early stages of its assembly. The discovery of this galaxy group is an example of the importance of mapping spatially resolved H i in a wide range of environments, including galaxy groups. This scientific goal has been dramatically enhanced by the high sensitivity, large field-of-view, and wide instantaneous bandwidth of the MeerKAT telescope. é 2021 The Author(s).
AB - We present the serendipitous discovery of a galaxy group in the XMM-LSS field with MIGHTEE Early Science observations. 20 galaxies are detected in H i in this z ∼0.044 group, with a 3σ column density sensitivity of NHI = 1.6 à1020 cm-2. This group has not been previously identified, despite residing in a well-studied extragalactic legacy field. We present spatially resolved H i total intensity and velocity maps for each of the objects which reveal environmental influence through disturbed morphologies. The group has a dynamical mass of log10(Mdyn/M⊙) = 12.32, and is unusually gas-rich, with an H i-to-stellar mass ratio of log10(f∗HI) = -0.2, which is 0.7 dex greater than expected. The group's high H i content, spatial, velocity, and identified galaxy type distributions strongly suggest that it is in the early stages of its assembly. The discovery of this galaxy group is an example of the importance of mapping spatially resolved H i in a wide range of environments, including galaxy groups. This scientific goal has been dramatically enhanced by the high sensitivity, large field-of-view, and wide instantaneous bandwidth of the MeerKAT telescope. é 2021 The Author(s).
UR - https://hdl.handle.net/1959.7/uws:63522
U2 - 10.1093/mnras/stab1817
DO - 10.1093/mnras/stab1817
M3 - Article
SN - 0035-8711
VL - 506
SP - 2753
EP - 2765
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -