WALLABY Pre-Pilot Survey: The effects of angular momentum and environment on the H i 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. Dénes, A. Elagali

Research output: Contribution to journalReview articlepeer-review

1 Citation (Scopus)

Abstract

We use high-resolution ASKAP observations of galaxies in the Eridanus supergroup to study their H i, 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 (jb-Mb) relation for the Eridanus galaxies is observed to be an unbroken power law of the form j{b}\propto M{b}0.57 ± 0.05, with a scatter of ∼0.10 ± 0.01 dex, consistent with previous works. We examine the relation between the atomic gas fraction, fatm, and the integrated atomic disc stability parameter q (the fatm-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 H i gas. We find that a majority of the Eridanus galaxies are H i 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.

Original languageEnglish
Pages (from-to)2949-2967
Number of pages19
JournalMonthly Notices of the Royal Astronomical Society
Volume507
Issue number2
DOIs
Publication statusPublished - 1 Oct 2021

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