ASKAP HI imaging of the galaxy group IC 1459

Abstract

We present HI imaging of the galaxy group IC 1459 carried out with six antennas of the Australian SKA Pathfinder equipped with phased-array feeds. We detect and resolve HI in eleven galaxies down to a column density of $\sim 10^{20}$ cm${}^{-2}$ inside a ~6 deg${}^2$ field and with a resolution of ~1 arcmin on the sky and ~8 km/s in velocity. We present HI images, velocity fields and integrated spectra of all detections, and highlight the discovery of three HI clouds -- two in the proximity of the galaxy IC 5270 and one close to NGC 7418. Each cloud has an HI mass of $10^9$ M${}_{\odot }$ and accounts for ~15% of the HI 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 HI 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 intra-group gas within the IC 1459 group. Altogether, the HI found outside galaxies in this group amounts to several times $10^9$ M${}_{\odot }$, at least 10% of the HI 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.

arXiv commentMNRAS accepted

References in corpus (32)

• How Do Galaxies Get Their Gas?
• The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances
• Cold gas accretion in galaxies
• The 1000 Brightest HIPASS Galaxies: HI Properties
• Science with ASKAP - the Australian Square Kilometre Array Pathfinder
• The Atlas3D project -- XIII. Mass and morphology of HI in early-type galaxies as a function of environment
• A Search for Extended Ultraviolet Disk (XUV-disk) Galaxies in the Local Universe
• The GEMS project: X-ray analysis and statistical properties of the group sample
• Where is the Neutral Atomic Gas in Hickson Groups?
• SoFiA: a flexible source finder for 3D spectral line data
• Science With The Australian Square Kilometre Array Pathfinder
• A large HI cloud near the centre of the Virgo cluster
• VLA HI imaging of the brightest spiral galaxies in Coma
• The Australian Square Kilometre Array Pathfinder: System Architecture and Specifications of the Boolardy Engineering Test Array
• SFI++ II: A New I-band Tully-Fisher Catalog, Derivation of Peculiar Velocities and Dataset Properties
• A Synthesis of Data from Fundamental Plane and Surface Brightness Fluctuation Surveys
• Only the Lonely: H I Imaging of Void Galaxies
• Overview on spectral line source finding and visualisation
• Extended, regular HI structures around early-type galaxies
• Southern GEMS Groups I: Dynamical Properties
• Southern GEMS groups II: HI distribution, mass functions and HI deficient galaxies
• Discovery of a giant HI tail in the galaxy group HCG 44
• Using negative detections to estimate source finder reliability
• HI content in galaxies in loose groups
• Massive HI clouds with no optical counterparts as high-density regions of intragroup HI rings and arcs
• The Vela Cloud: A Giant HI Anomaly in the NGC 3256 Group
• HI imaging of galaxies in X-ray bright groups
• ATCA HI Observations of the Peculiar Galaxy IC2554
• The multi-frequency parsec-scale structure of PKS 2254-367 (IC 1459): a luminosity-dependent break in morphology for the precursors of radio galaxies?
• An extremely optically dim tidal feature in the gas-rich interacting galaxy group NGC 871/NGC 876/NGC 877
• Gaseous Tidal Debris found in the NGC 3783 Group
• NOIRCAT - The Northern HIPASS Optical/IR Catalogue

Cited by in corpus (43)

• WALLABY -- An SKA Pathfinder HI Survey
• The detection of an extremely bright fast radio burst in a phased array feed survey
• The Local Volume HI Survey (LVHIS)
• The Australian Square Kilometre Array Pathfinder: Performance of the Boolardy Engineering Test Array
• The HI Content of Galaxies in Groups and Clusters as Measured by ALFALFA
• Extragalactic HI Surveys
• 2D Bayesian automated tilted-ring fitting of disk galaxies in large HI galaxy surveys: 2DBAT
• Illuminating the past 8 billion years of cold gas towards two gravitationally lensed quasars
• Transfer learning for radio galaxy classification
• Deep Learning Based Detection of Cosmological Diffuse Radio Sources
• WALLABY Early Science - II. The NGC 7232 galaxy group
• VEGAS: VST Early-type GAlaxy Survey. V. IC 1459 group: Mass assembly history in low density environments
• Deep Investigation of Neutral Gas Origins (DINGO): HI stacking experiments with early science data
• Wide-field broadband radio imaging with phased array feeds: a pilot multi-epoch continuum survey with ASKAP-BETA
• ALFALFA and WSRT Imaging of Extended HI Features in the Leo Cloud of Galaxies
• HI in Group Interactions: HCG 44
• A successful search for intervening 21 cm HI absorption in galaxies at 0.4 < z <1.0 with the Australian Square Kilometre Array Pathfinder (ASKAP)
• Revealing HI gas in emission and absorption on pc to kpc scales in a galaxy at z ~ 0.017
• The Arecibo Ultra-Deep Survey
• Early Observations of the MHONGOOSE Galaxies: Getting Ready for MeerKAT
• Ultra Diffuse Galaxies in the IC1459 Group from the VEGAS Survey
• WALLABY Early Science - I. The NGC 7162 Galaxy Group
• ALMA/ACA CO Survey of the IC 1459 and NGC 4636 Groups: Environmental Effects on the Molecular Gas of Group Galaxies
• Connecting optical morphology, environment, and HI mass fraction for low-redshift galaxies using deep learning
• One year of monitoring the Vela pulsar using a Phased Array Feed
• WALLABY pre-pilot survey: Two dark clouds in the vicinity of NGC 1395
• HI debris in the IC 1459 galaxy group
• A 5deg x 5deg deep HI survey of the M81 group
• Massive Galaxy Mergers Have Distinctive Global HI Profiles
• Gas Accretion and Star Formation Rates
• High-velocity OH megamasers in IRAS 20100-4156: Evidence for a Supermassive Black Hole
• Deep optical imaging of the dark galaxy candidate AGESVC1 282
• Commissioning the HI Observing Mode of the Beamformer for the Cryogenically Cooled Focal L-band Array for the GBT (FLAG)
• Unravelling the Origin of the Counter-Rotating Core in IC 1459 with KMOS and MUSE
• Mapping HI 21-cm in the Klemola 31 group at z = 0.029: emission and absorption towards PKS2020-370
• Spectral-line Observations Using a Phased Array Feed on the Parkes Telescope
• WALLABY Pilot Survey: Hydra Cluster Galaxies UV and HI morphometrics
• A 5deg x 5deg deep HI survey of the M81 group: II. HI distribution and kinematics of IC 2574 and HIJASS J1021+68
• Deciphering the Origin of Ionized Gas in IC 1459 with VLT/MUSE
• The technological and scientific development of ASKAP
• Astroinformatics Challenges from Next-generation Radio Continuum Surveys
• Gemini Follow-up of two massive HI clouds discovered with the Australian Square Kilometer Array Pathfinder
• Neutral Hydrogen in Nearby Dwarf Galaxies