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ASKAP HI imaging of the galaxy group IC 1459

Serra, P.; Kilborn, Virginia A; Koribalski, Baerbel S; Allison, J.R.; Amy, S.W.; Ball, Lewis; Bannister, Keith; Bell, M.; Bock, D. C.-J.; Bolton, R.; Bowen, M.; Boyle, B.; Broadhurst, S.; Brodrick, D.; Brothers, M.; Bunton, John D.; Chapman, J.; Cheng, W.; Chippendale, A.P.; Chung, Y.; Cooray, F.; Cornwell, T.; DeBoer, D.; Diamond, P.; Forsyth, R.; Gough, R; Hampson, G.; Harvey-Smith, L.; Hayman, D.B.; Hotan, A.W.; McClure-Griffiths, Naomi

Description

We present H I imaging of the galaxy group IC 1459 carried out with six antennas of the Australian Square Kilometre Array Pathfinder equipped with phased-array feeds. We detect and resolve H I in 11 galaxies down to a column density of ∼1020 cm−2 inside a ∼6 deg2 field and with a resolution of ∼1 arcmin on the sky and ∼8 km s−1 in velocity. We present H I images, velocity fields and integrated spectra of all detections, and highlight the discovery of three H I clouds – two in the proximity of...[Show more]

dc.contributor.authorSerra, P.
dc.contributor.authorKilborn, Virginia A
dc.contributor.authorKoribalski, Baerbel S
dc.contributor.authorAllison, J.R.
dc.contributor.authorAmy, S.W.
dc.contributor.authorBall, Lewis
dc.contributor.authorBannister, Keith
dc.contributor.authorBell, M.
dc.contributor.authorBock, D. C.-J.
dc.contributor.authorBolton, R.
dc.contributor.authorBowen, M.
dc.contributor.authorBoyle, B.
dc.contributor.authorBroadhurst, S.
dc.contributor.authorBrodrick, D.
dc.contributor.authorBrothers, M.
dc.contributor.authorBunton, John D.
dc.contributor.authorChapman, J.
dc.contributor.authorCheng, W.
dc.contributor.authorChippendale, A.P.
dc.contributor.authorChung, Y.
dc.contributor.authorCooray, F.
dc.contributor.authorCornwell, T.
dc.contributor.authorDeBoer, D.
dc.contributor.authorDiamond, P.
dc.contributor.authorForsyth, R.
dc.contributor.authorGough, R
dc.contributor.authorHampson, G.
dc.contributor.authorHarvey-Smith, L.
dc.contributor.authorHayman, D.B.
dc.contributor.authorHotan, A.W.
dc.contributor.authorMcClure-Griffiths, Naomi
dc.date.accessioned2016-06-14T23:20:32Z
dc.identifier.issn0035-8711
dc.identifier.urihttp://hdl.handle.net/1885/103435
dc.description.abstractWe present H I imaging of the galaxy group IC 1459 carried out with six antennas of the Australian Square Kilometre Array Pathfinder equipped with phased-array feeds. We detect and resolve H I in 11 galaxies down to a column density of ∼1020 cm−2 inside a ∼6 deg2 field and with a resolution of ∼1 arcmin on the sky and ∼8 km s−1 in velocity. We present H I images, velocity fields and integrated spectra of all detections, and highlight the discovery of three H I clouds – two in the proximity of the galaxy IC 5270 and one close to NGC 7418. Each cloud has an H I mass of ∼109 M and accounts for ∼15 per cent of the H I associated with its host galaxy. Available images at ultraviolet, optical and infrared wavelengths do not reveal any clear stellar counterpart of any of the clouds, suggesting that they are not gas-rich dwarf neighbours of IC 5270 and NGC 7418. Using Parkes data, we find evidence of additional extended, low-column-density H I emission around IC 5270, indicating that the clouds are the tip of the iceberg of a larger system of gas surrounding this galaxy. This result adds to the body of evidence on the presence of intragroup gas within the IC 1459 group. Altogether, the H I found outside galaxies in this group amounts to several times 109 M, at least 10 per cent of the H I contained inside galaxies. This suggests a substantial flow of gas in and out of galaxies during the several billion years of the group’s evolution.
dc.publisherBlackwell Publishing Ltd
dc.rightsAuthor/s retain copyright
dc.sourceMonthly Notices of the Royal Astronomical Society
dc.titleASKAP HI imaging of the galaxy group IC 1459
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume452
dc.date.issued2015
local.identifier.absfor020100 - ASTRONOMICAL AND SPACE SCIENCES
local.identifier.ariespublicationU3488905xPUB7672
local.type.statusPublished Version
local.contributor.affiliationSerra, P., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationKilborn, Virginia A, Swinburne University of Technology
local.contributor.affiliationKoribalski, Baerbel S, CSIRO, Australia Telescope National Facility
local.contributor.affiliationAllison, J.R., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationAmy, S.W., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationBall, Lewis, CSIRO
local.contributor.affiliationBannister, Keith, CSIRO Astronomy and Space Science
local.contributor.affiliationBell, M., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationBock, D. C.-J., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationBolton, R., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationBowen, M., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationBoyle, B., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationBroadhurst, S., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationBrodrick, D., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationBrothers, M., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationBunton, John D., CSIRO TIP
local.contributor.affiliationChapman, J., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationCheng, W., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationChippendale, A.P., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationChung, Y., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationCooray, F., CSIRO Digital Productivity
local.contributor.affiliationCornwell, T., Jodrell Bank Observatory
local.contributor.affiliationDeBoer, D., University of California (Berkeley)
local.contributor.affiliationDiamond, P., SKA Organisation
local.contributor.affiliationForsyth, R., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationGough, R, CSIRO, Australia Telescope National Facility
local.contributor.affiliationHampson, G., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationHarvey-Smith, L., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationHayman, D.B., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationHotan, A.W., CSIRO Astronomy and Space Science (CASS)
local.contributor.affiliationMcClure-Griffiths, Naomi, College of Physical and Mathematical Sciences, ANU
local.bibliographicCitation.issue3
local.bibliographicCitation.startpage2680
local.bibliographicCitation.lastpage2691
local.identifier.doi10.1093/mnras/stv1326
dc.date.updated2016-06-14T08:50:25Z
local.identifier.scopusID2-s2.0-84945281543
dcterms.accessRightsOpen Access
CollectionsANU Research Publications

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