Wallaby Early Science - IV. ASKAP H I imaging of the nearby galaxy IC 5201

D. Kleiner*, B. S. Koribalski, P. Serra, M. T. Whiting, T. Westmeier, O. I. Wong, P. Kamphuis, A. Popping, G. Bekiaris, A. Elagali, B. Q. For, K. Lee-Waddell, J. P. Madrid, T. N. Reynolds, J. Rhee, L. Shao, L. Staveley-Smith, J. Wang, C. S. Anderson, J. CollierS. M. Ord, M. A. Voronkov

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    30 Citations (Scopus)

    Abstract

    We present a Wide-field ASKAP L-Band Legacy All-sky Blind surveY (WALLABY) study of the nearby (vsys = 915 km s−1) spiral galaxy IC 5201 using the Australian Square Kilometre Array Pathfinder (ASKAP). IC 5201 is a blue, barred spiral galaxy that follows the known scaling relations between stellar mass, SFR, H I mass, and diameter. We create a four-beam mosaicked H I image cube from 175 h of observations made with a 12-antenna sub-array. The root mean square noise level of the cube is 1.7 mJy beam−1 per channel, equivalent to a column density of NH I = 1.4 × 1020 cm−2 over 25 km s−1. We report nine extragalactic H I detections - five new H I detections including the first velocity measurements for two galaxies. These sources are IC 5201, three dwarf satellite galaxies, two galaxies, and a tidal feature belonging to the NGC 7232/3 triplet and two potential infalling galaxies to the triplet. There is evidence of a previous tidal interaction between IC 5201 and the irregular satellite AM 2220−460. A close fly-by is likely responsible for the asymmetric optical morphology of IC 5201 and warping its disc, resulting in the irregular morphology of AM 2220−460. We quantify the H I kinematics of IC 5201, presenting its rotation curve as well as showing that the warp starts at 14 kpc along the major axis, increasing as a function of radius with a maximum difference in position angle of 20. There is no evidence of stripped H I, triggered or quenched star formation in the system as measured using DECam optical and GALEX UV photometry.

    Original languageEnglish
    Pages (from-to)5352-5369
    Number of pages18
    JournalMonthly Notices of the Royal Astronomical Society
    Volume488
    Issue number4
    DOIs
    Publication statusPublished - 1 Oct 2019

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