WALLABY Early Science - II. The NGC 7232 galaxy group

K. Lee-Waddell; B. S. Koribalski; T. Westmeier; A. Elagali; B. Q. For; D. Kleiner; J. P. Madrid; A. Popping; T. N. Reynolds; J. Rhee; P. Serra; L. Shao; L. Staveley-Smith; J. Wang; M. T. Whiting; O. I. Wong; J. R. Allison; S. Bhandari; J. D. Collier; G. Heald; J. Marvil; S. M. Ord

doi:10.1093/mnras/stz017

WALLABY Early Science - II. The NGC 7232 galaxy group

K. Lee-Waddell, B. S. Koribalski, T. Westmeier, A. Elagali, B. Q. For, D. Kleiner, J. P. Madrid, A. Popping, T. N. Reynolds, J. Rhee, P. Serra, L. Shao, L. Staveley-Smith, J. Wang, M. T. Whiting, O. I. Wong, J. R. Allison, S. Bhandari, J. D. Collier, G. HealdJ. Marvil, S. M. Ord

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Abstract

We report on neutral hydrogen (H i) observations of the NGC 7232 group with the Australian Square Kilometre Array Pathfinder (ASKAP). These observations were conducted as part of the Wide-field ASKAP L-Band Legacy All-sky Blind surveY (WALLABY) Early Science program with an array of 12 ASKAP antennas equipped with Phased Array Feeds, which were used to form 36 beams to map a field of view of 30 deg². Analysing a subregion of the central beams, we detect 17 H i sources. Eleven of these detections are identified as galaxies and have stellar counterparts, of which five are newly resolved H i galaxy sources. The other six detections appear to be tidal debris in the form of H i clouds that are associated with the central triplet, NGC 7232/3, comprising the spiral galaxies NGC 7232, NGC 7232B, and NGC 7233. One of these H i clouds has a mass of M_Hi -3 × 10⁸ M_⊙ and could be the progenitor of a long-lived tidal dwarf galaxy. The remaining H i clouds are likely transient tidal knots that are possibly part of a diffuse tidal bridge between NGC 7232/3 and another group member, the lenticular galaxy IC 5181.

Original language	English
Pages (from-to)	5248-5262
Number of pages	15
Journal	Monthly Notices of the Royal Astronomical Society
Volume	487
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stz017
Publication status	Published - 25 Jun 2019

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Lee-Waddell, K., Koribalski, B. S., Westmeier, T., Elagali, A., For, B. Q., Kleiner, D., Madrid, J. P., Popping, A., Reynolds, T. N., Rhee, J., Serra, P., Shao, L., Staveley-Smith, L., Wang, J., Whiting, M. T., Wong, O. I., Allison, J. R., Bhandari, S., Collier, J. D., ... Ord, S. M. (2019). WALLABY Early Science - II. The NGC 7232 galaxy group. Monthly Notices of the Royal Astronomical Society, 487(4), 5248-5262. https://doi.org/10.1093/mnras/stz017

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title = "WALLABY Early Science - II. The NGC 7232 galaxy group",

abstract = "We report on neutral hydrogen (H i) observations of the NGC 7232 group with the Australian Square Kilometre Array Pathfinder (ASKAP). These observations were conducted as part of the Wide-field ASKAP L-Band Legacy All-sky Blind surveY (WALLABY) Early Science program with an array of 12 ASKAP antennas equipped with Phased Array Feeds, which were used to form 36 beams to map a field of view of 30 deg2. Analysing a subregion of the central beams, we detect 17 H i sources. Eleven of these detections are identified as galaxies and have stellar counterparts, of which five are newly resolved H i galaxy sources. The other six detections appear to be tidal debris in the form of H i clouds that are associated with the central triplet, NGC 7232/3, comprising the spiral galaxies NGC 7232, NGC 7232B, and NGC 7233. One of these H i clouds has a mass of MHi -3 × 108 M⊙ and could be the progenitor of a long-lived tidal dwarf galaxy. The remaining H i clouds are likely transient tidal knots that are possibly part of a diffuse tidal bridge between NGC 7232/3 and another group member, the lenticular galaxy IC 5181.",

keywords = "galaxies: groups: individual: NGC 7232, galaxies: interactions",

author = "K. Lee-Waddell and Koribalski, {B. S.} and T. Westmeier and A. Elagali and For, {B. Q.} and D. Kleiner and Madrid, {J. P.} and A. Popping and Reynolds, {T. N.} and J. Rhee and P. Serra and L. Shao and L. Staveley-Smith and J. Wang and Whiting, {M. T.} and Wong, {O. I.} and Allison, {J. R.} and S. Bhandari and Collier, {J. D.} and G. Heald and J. Marvil and Ord, {S. M.}",

note = "Publisher Copyright: {\textcopyright} 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.",

year = "2019",

month = jun,

day = "25",

doi = "10.1093/mnras/stz017",

language = "English",

volume = "487",

pages = "5248--5262",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

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Lee-Waddell, K, Koribalski, BS, Westmeier, T, Elagali, A, For, BQ, Kleiner, D, Madrid, JP, Popping, A, Reynolds, TN, Rhee, J, Serra, P, Shao, L, Staveley-Smith, L, Wang, J, Whiting, MT, Wong, OI, Allison, JR, Bhandari, S, Collier, JD, Heald, G, Marvil, J & Ord, SM 2019, 'WALLABY Early Science - II. The NGC 7232 galaxy group', Monthly Notices of the Royal Astronomical Society, vol. 487, no. 4, pp. 5248-5262. https://doi.org/10.1093/mnras/stz017

TY - JOUR

T1 - WALLABY Early Science - II. The NGC 7232 galaxy group

AU - Lee-Waddell, K.

AU - Koribalski, B. S.

AU - Westmeier, T.

AU - Elagali, A.

AU - For, B. Q.

AU - Kleiner, D.

AU - Madrid, J. P.

AU - Popping, A.

AU - Reynolds, T. N.

AU - Rhee, J.

AU - Serra, P.

AU - Shao, L.

AU - Staveley-Smith, L.

AU - Wang, J.

AU - Whiting, M. T.

AU - Wong, O. I.

AU - Allison, J. R.

AU - Bhandari, S.

AU - Collier, J. D.

AU - Heald, G.

AU - Marvil, J.

AU - Ord, S. M.

PY - 2019/6/25

Y1 - 2019/6/25

N2 - We report on neutral hydrogen (H i) observations of the NGC 7232 group with the Australian Square Kilometre Array Pathfinder (ASKAP). These observations were conducted as part of the Wide-field ASKAP L-Band Legacy All-sky Blind surveY (WALLABY) Early Science program with an array of 12 ASKAP antennas equipped with Phased Array Feeds, which were used to form 36 beams to map a field of view of 30 deg2. Analysing a subregion of the central beams, we detect 17 H i sources. Eleven of these detections are identified as galaxies and have stellar counterparts, of which five are newly resolved H i galaxy sources. The other six detections appear to be tidal debris in the form of H i clouds that are associated with the central triplet, NGC 7232/3, comprising the spiral galaxies NGC 7232, NGC 7232B, and NGC 7233. One of these H i clouds has a mass of MHi -3 × 108 M⊙ and could be the progenitor of a long-lived tidal dwarf galaxy. The remaining H i clouds are likely transient tidal knots that are possibly part of a diffuse tidal bridge between NGC 7232/3 and another group member, the lenticular galaxy IC 5181.

AB - We report on neutral hydrogen (H i) observations of the NGC 7232 group with the Australian Square Kilometre Array Pathfinder (ASKAP). These observations were conducted as part of the Wide-field ASKAP L-Band Legacy All-sky Blind surveY (WALLABY) Early Science program with an array of 12 ASKAP antennas equipped with Phased Array Feeds, which were used to form 36 beams to map a field of view of 30 deg2. Analysing a subregion of the central beams, we detect 17 H i sources. Eleven of these detections are identified as galaxies and have stellar counterparts, of which five are newly resolved H i galaxy sources. The other six detections appear to be tidal debris in the form of H i clouds that are associated with the central triplet, NGC 7232/3, comprising the spiral galaxies NGC 7232, NGC 7232B, and NGC 7233. One of these H i clouds has a mass of MHi -3 × 108 M⊙ and could be the progenitor of a long-lived tidal dwarf galaxy. The remaining H i clouds are likely transient tidal knots that are possibly part of a diffuse tidal bridge between NGC 7232/3 and another group member, the lenticular galaxy IC 5181.

KW - galaxies: groups: individual: NGC 7232

KW - galaxies: interactions

UR - http://www.scopus.com/inward/record.url?scp=85070063881&partnerID=8YFLogxK

U2 - 10.1093/mnras/stz017

DO - 10.1093/mnras/stz017

M3 - Article

SN - 0035-8711

VL - 487

SP - 5248

EP - 5262

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 4

ER -

WALLABY Early Science - II. The NGC 7232 galaxy group

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