J/A+A/654/A173      MeerKAT 21-cm HI imaging of Abell 2626        (Healy+, 2021)

MeerKAT 21-cm H I imaging of Abell 2626 and beyond. Healy J., Deb T., Verheijen M.A.W., Blyth S.-L., Serra P., Ramatsoku M., Vulcani B. <Astron. Astrophys. 654, A173 (2021)> =2021A&A...654A.173H 2021A&A...654A.173H (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; H I data ; Redshifts Keywords: line: profiles - galaxies: evolution - galaxies: clusters: general - radio lines: galaxies Abstract: The morphology-density relation manifests the environmental dependence of the formation and evolution of galaxies as they continuously migrate through the cosmic web to ever denser environments. As gas-rich galaxies traverse the outskirts and inner regions of galaxy clusters, they experience sudden and radical changes in their gas content and star formation activity. The goal of this work is to gain an HI perspective on gas depletion mechanisms acting on galaxies and galaxy groups that are being accreted by a moderately massive galaxy cluster. We aim to study the relative importance and efficiency of processes such as ram-pressure stripping and tidal interactions as well as their dependency on the local and global environment of galaxies in the cluster core and in its surroundings. We have conducted a blind radio continuum and Hi spectral line imaging survey with the MeerKAT radio telescope of a 2"x2" area centred on the galaxy cluster Abell 2626. We have used the CARAcal pipeline to reduce the data, SoFiA to detect sources within the Hi data cube, and GIPSY to construct spatially resolved information on the Hi morphologies and kinematics of the Hi detected galaxies. We have detected HI in 219 galaxies with optical counterparts within the entire surveyed volume. We present the HI properties of each of the detected galaxies as a data catalogue and as an atlas page for each galaxy, including HI column-density maps, velocity fields, position-velocity diagrams, and global HI profiles. These data will also be used for case studies of identified 'jellyfish' galaxies and galaxy population studies by means of morphological classification of the direct HI detections as well as using the HI stacking technique. Description: MeerKAT observations of A2626 were carried out over the nights of 15-17 July 2019, allocated in response to the first call for MeerKAT-64 open time proposals, which were on a shared risk basis (project code SCI-20190418-JH-01). The observed HI parameters of all 219 galaxies detected in our MeerKAT survey are listed in table A.1 in Appendix A. These properties are derived from the global HI profiles as presented in the atlas pages. Information that can be derived from the two-dimensional HI column density maps and velocity fields, such as the size and asymmetry of the HI gas disc and its kinematic position angle, will be presented in a forthcoming paper. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file tablea1.dat 78 219 Results from the HI synthesis observations -------------------------------------------------------------------------------- See also: J/A+A/643/A172 : Abell 2626 radio source LOFAR image at 144MHz (Ignesti+, 2020) Byte-by-byte Description of file: tablea1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 3 I3 --- HI-ID Galaxy ID in this catalogue 6- 24 A19 --- Name Galaxy name, JHHMMSS.ss+DDMMSS.s (1) 27- 31 I5 km/s cz HI redshift 33- 35 I3 km/s e_cz Error on HI redshift 38- 40 I3 km/s W20 Line width of global profile at 20% of peak flux 42- 44 I3 km/s e_W20 Error on W20 46- 48 I3 km/s W50 ? Line width of global profile at 50% of peak flux 50- 52 I3 km/s e_W50 ? Error on W50 54- 59 F6.3 Jy.km/s Sint HI integrated flux 61- 65 F5.3 Jy.km/s e_Sint Error on Sint 67 A1 --- l_Fnu Flag on integrated continuum flux (Fnu) (2) 68- 72 F5.3 mJy Fnu ? Integrated continuum flux density 74- 78 F5.3 mJy e_Fnu ? Error on Fnu (3) -------------------------------------------------------------------------------- Note (1): Right ascension and declination (J2000) coordinates contained within the name. Note (2): '<' denotes the 5σ upper limit on Fnu. Note (3): error is non-existant when Fnu is an upper limit. -------------------------------------------------------------------------------- Acknowledgements: Julia Healy, juliahealyza(at)gmail.com
(End) Patricia Vannier [CDS] 06-Aug-2021
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