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27 April 2024 |
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WALLABY Pre-Pilot Survey: The effects of angular momentum and environment on the HI gas and star formation properties of galaxies in the Eridanus supergroup | | C. Murugeshan
; V. A. Kilborn
; B.-Q. For
; O. I. Wong
; J. Wang
; T. Westmeier
; A. R. H. Stevens
; K. Spekkens
; P. Kamphuis
; L. Staveley-Smith
; K. Lee-Waddell
; D. Kleiner
; B. S. Koribalski
; M. E. Cluver
; S.-H. Oh
; J. Rhee
; B. Catinella
; T. N. Reynolds
; H. Denes
; A. Elagali
; | | Date: |
10 Aug 2021 | | Abstract: | We use high-resolution ASKAP observations of galaxies in the Eridanus
supergroup to study their HI, angular momentum and star formation properties,
as part of the WALLABY pre-pilot survey efforts. The Eridanus supergroup is
composed of three sub-groups in the process of merging to form a cluster. The
main focus of this study is the Eridanus (or NGC 1395) sub-group. The baryonic
specific angular momentum - baryonic mass ($j_{mathrm{b}} - M_{mathrm{b}}$)
relation for the Eridanus galaxies is observed to be an unbroken power law of
the form $j_{mathrm{b}} propto M_{mathrm{b}}^{0.57 pm 0.05}$, with a
scatter of $sim 0.10 pm 0.01$ dex, consistent with previous works. We examine
the relation between the atomic gas fraction, $f_{mathrm{atm}}$, and the
integrated atomic disc stability parameter $q$ (the $f_{mathrm{atm}} - q$
relation), and find that the Eridanus galaxies deviate significantly from the
relation owing to environmental processes such as tidal interactions and
ram-pressure affecting their HI gas. We find that a majority of the Eridanus
galaxies are HI deficient compared to normal star-forming galaxies in the
field. We also find that the star formation among the Eridanus galaxies may be
suppressed owing to their environment, thus hinting at significant levels of
pre-processing within the Eridanus sub-group, even before the galaxies have
entered a cluster-like environment. | | Source: | arXiv, 2108.04414 | | Services: | Forum | Review | PDF | Favorites | |
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