WALLABY pilot survey: Public release of H i data for almost 600 galaxies from phase 1 of ASKAP pilot observations
-
Published:2022
Issue:
Volume:39
Page:
-
ISSN:1323-3580
-
Container-title:Publications of the Astronomical Society of Australia
-
language:en
-
Short-container-title:Publ. Astron. Soc. Aust.
Author:
Westmeier T.ORCID, Deg N.ORCID, Spekkens K., Reynolds T. N.ORCID, Shen A. X., Gaudet S., Goliath S., Huynh M. T., Venkataraman P., Lin X., O’Beirne T., Catinella B., Cortese L.ORCID, Dénes H.ORCID, Elagali A., For B.-Q., Józsa G. I. G., Howlett C., van der Hulst J. M.ORCID, Jurek R. J., Kamphuis P., Kilborn V. A., Kleiner D., Koribalski B. S., Lee-Waddell K.ORCID, Murugeshan C., Rhee J., Serra P., Shao L., Staveley-Smith L.ORCID, Wang J., Wong O. I.ORCID, Zwaan M. A., Allison J. R.ORCID, Anderson C. S.ORCID, Ball Lewis, Bock D. C.-J., Brodrick D., Bunton J. D., Cooray F. R., Gupta N., Hayman D. B., Mahony E. K., Moss V. A.ORCID, Ng A., Pearce S. E., Raja W., Roxby D. N., Voronkov M. A., Warhurst K. A., Courtois H. M., Said K.
Abstract
Abstract
We present WALLABY pilot data release 1, the first public release of H i pilot survey data from the Wide-field ASKAP L-band Legacy All-sky Blind Survey (WALLABY) on the Australian Square Kilometre Array Pathfinder. Phase 1 of the WALLABY pilot survey targeted three
$60\,\mathrm{deg}^{2}$
regions on the sky in the direction of the Hydra and Norma galaxy clusters and the NGC 4636 galaxy group, covering the redshift range of
$z \lesssim 0.08$
. The source catalogue, images and spectra of nearly 600 extragalactic H i detections and kinematic models for 109 spatially resolved galaxies are available. As the pilot survey targeted regions containing nearby group and cluster environments, the median redshift of the sample of
$z \approx 0.014$
is relatively low compared to the full WALLABY survey. The median galaxy H i mass is
$2.3 \times 10^{9}\,{\rm M}_{{\odot}}$
. The target noise level of
$1.6\,\mathrm{mJy}$
per 30′′ beam and
$18.5\,\mathrm{kHz}$
channel translates into a
$5 \sigma$
H i mass sensitivity for point sources of about
$5.2 \times 10^{8} \, (D_{\rm L} / \mathrm{100\,Mpc})^{2} \, {\rm M}_{{\odot}}$
across 50 spectral channels (
${\approx} 200\,\mathrm{km \, s}^{-1}$
) and a
$5 \sigma$
H i column density sensitivity of about
$8.6 \times 10^{19} \, (1 + z)^{4}\,\mathrm{cm}^{-2}$
across 5 channels (
${\approx} 20\,\mathrm{km \, s}^{-1}$
) for emission filling the 30′′ beam. As expected for a pilot survey, several technical issues and artefacts are still affecting the data quality. Most notably, there are systematic flux errors of up to several 10% caused by uncertainties about the exact size and shape of each of the primary beams as well as the presence of sidelobes due to the finite deconvolution threshold. In addition, artefacts such as residual continuum emission and bandpass ripples have affected some of the data. The pilot survey has been highly successful in uncovering such technical problems, most of which are expected to be addressed and rectified before the start of the full WALLABY survey.
Publisher
Cambridge University Press (CUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics
Reference65 articles.
1. Cortese, L. , Catinella, B. , & Smith, R. 2021, PASA, 38, e035 2. Cornwell, T. J. 2008, IEEE JSTSP, 2, 793 3. Knapp, G. R. , Faber, S. M. , & Gallagher, J. S. 1978, AJ, 83, 11 4. Baldi, A. , Forman, W. , Jones, C. , Kraft, R. , Nulsen, P. , Churazov, E. , David, L. , & Giacintucci, S. 2009, ApJ, 707, 1034 5. Huynh, M. , Dempsey, J. , Whiting, M. T. , & Ophel, M. 2020, in Astronomical Society of the Pacific Conference Series, Vol. 522, Astronomical Data Analysis Software and Systems XXVII, ed. P. Ballester, J. Ibsen, M. Solar, & K. Shortridge, 263
Cited by
13 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献
|
|