MIGHTEE-HI: discovery of an HI-rich galaxy group at z = 0.044 with MeerKAT

Simple item page
dc.contributor.authorRanchod, Shilpa
dc.contributor.authorDeane, Roger
dc.contributor.authorPonomareva, Anastasia
dc.date.accessioned2021-09-22T07:07:35Z
dc.date.available2021-09-22T07:07:35Z
dc.date.issued2021
dc.description.abstractWe present the serendipitous discovery of a galaxy group in the XMM-LSS field with MIGHTEE Early Science observations. 20 galaxies are detected in HI in this z ∼ 0.044 group, with a 3σ column density sensitivity of NHI = 1.6 × 1020 cm−2. This group has not been previously identified, despite residing in a well-studied extragalactic legacy field. We present spatially resolved HI 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 HI-to-stellar mass ratio of log10 (f∗HI) = −0.2, which is 0.7 dex greater than expected. The group’s high HI 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 HI 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.en_US
dc.identifier.citationShilpa Ranchod, Roger P Deane, Anastasia A Ponomareva, Tariq Blecher, Bradley S Frank, Matt J Jarvis, Natasha Maddox, Wanga Mulaudzi, Marcin Glowacki, Kelley M Hess, Madalina Tudorache, Lourdes Verdes-Montenegro, Nathan J Adams, Rebecca A A Bowler, Jordan D Collier, Russ Taylor, MIGHTEE-HI: discovery of an H I-rich galaxy group at z = 0.044 with MeerKAT, Monthly Notices of the Royal Astronomical Society, Volume 506, Issue 2, September 2021, Pages 2753–2765, https://doi.org/10.1093/mnras/stab1817en_US
dc.identifier.uridoi.org/10.1093/mnras/stab1817
dc.identifier.urihttp://hdl.handle.net/10566/6751
dc.language.isoenen_US
dc.publisherMonthly Notices of the Royal Astronomical Societyen_US
dc.subjectinstrumentationen_US
dc.subjectinterferometer – galaxiesen_US
dc.subjectevolution – galaxiesen_US
dc.subjectgroupsen_US
dc.subjectindividual – radio linesen_US
dc.subjectgalaxiesen_US
dc.titleMIGHTEE-HI: discovery of an HI-rich galaxy group at z = 0.044 with MeerKATen_US
dc.typeArticleen_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
MIGHTEEHI-Discovery-of-an-H-irich-galaxy-group-at-z--0044-with-MeerKATMonthly-Notices-of-the-Royal-Astronomical-Society.pdf
Size:
5.14 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Research Articles (Physics)