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The MeerKAT Absorpt...
The MeerKAT Absorption Line Survey (MALS) Data Release. I. Stokes I Image Catalogs at 1-1.4 GHz
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- Deka, P. P. (author)
- Inter-University Centre for Astronomy and Astrophysics (IUCAA)
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- Gupta, N. (author)
- Inter-University Centre for Astronomy and Astrophysics (IUCAA)
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- Jagannathan, P. (author)
- National Radio Astronomy Observatory
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- Sekhar, S. (author)
- National Radio Astronomy Observatory
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- Momjian, E. (author)
- National Radio Astronomy Observatory
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- Bhatnagar, S. (author)
- National Radio Astronomy Observatory
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- Wagenveld, J. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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- Kloeckner, H. -R. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG)
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Jose, J. (author)
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- Balashev, S. A. (author)
- Russian Academy of Sciences
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- Combes, F. (author)
- PSL University Paris
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- Hilton, M. (author)
- University of KwaZulu-Natal,University of Witwatersrand
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- Borgaonkar, D. (author)
- Inter-University Centre for Astronomy and Astrophysics (IUCAA)
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Chatterjee, A. (author)
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- Emig, K. L. (author)
- National Radio Astronomy Observatory
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Gaunekar, A. N. (author)
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- Jozsa, G. I. G. (author)
- Max Planck Gesellschaft zur Förderung der Wissenschaften e.V. (MPG),Max Planck Society for the Advancement of Science (MPG),Rhodes University
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- Klutse, D. Y. (author)
- University of KwaZulu-Natal
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- Knowles, K. (author)
- Rhodes University
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- Krogager, J. -k. (author)
- Université de Lyon
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- Mohapatra, A. (author)
- Inter-University Centre for Astronomy and Astrophysics (IUCAA)
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- Moodley, K. (author)
- University of KwaZulu-Natal
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- Muller, Sebastien, 1976 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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Noterdaeme, P. (author)
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Petitjean, P. (author)
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Salas, P. (author)
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- Sikhosana, S. (author)
- University of KwaZulu-Natal
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(creator_code:org_t)
- 2024
- 2024
- English.
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In: Astrophysical Journal, Supplement Series. - 1538-4365 .- 0067-0049. ; 270:2
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https://doi.org/10.3...
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Abstract
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- The MeerKAT Absorption Line Survey (MALS) has observed 391 telescope pointings at the L band (900-1670 MHz) at delta less than or similar to +20 degrees. We present radio continuum images and a catalog of 495,325 (240,321) radio sources detected at a signal-to-noise ratio (S/N) > 5 over an area of 2289 deg(2) (1132 deg(2)) at 1006 MHz (1381 MHz). Every MALS pointing contains a central bright radio source (S 1 GHz greater than or similar to 0.2 Jy). The median spatial resolution is 12 ''(8 ''). The median rms noise away from the pointing center is 25 mu Jy beam(-1) (22 mu Jy beam-1) and is within similar to 15% of the achievable theoretical sensitivity. The flux density scale ratio and astrometric accuracy deduced from multiply observed sources in MALS are <1% (8% scatter) and 1 '', respectively. Through comparisons with NVSS and FIRST at 1.4 GHz, we establish the catalog's accuracy in the flux density scale and astrometry to be better than 6% (15% scatter) and 0.'' 8, respectively. The median flux density offset is higher (9%) for an alternate beam model based on holographic measurements. The MALS radio source counts at 1.4 GHz are in agreement with literature. We estimate spectral indices (alpha) of a subset of 125,621 sources (S/N > 8), confirm the flattening of spectral indices with decreasing flux density, and identify 140 ultra-steep-spectrum (alpha < -1.3) sources as prospective high-z radio galaxies (z > 2). We have identified 1308 variable and 122 transient radio sources comprising primarily active galactic nuclei that demonstrate long-term (26 yr) variability in their observed flux densities. The MALS catalogs and images are publicly available at https://mals.iucaa.in.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
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- art (subject category)
- ref (subject category)
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- By the author/editor
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Deka, P. P.
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Gupta, N.
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Jagannathan, P.
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Sekhar, S.
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Momjian, E.
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Bhatnagar, S.
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show more...
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Wagenveld, J.
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Kloeckner, H. -R ...
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Jose, J.
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Balashev, S. A.
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Combes, F.
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Hilton, M.
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Borgaonkar, D.
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Chatterjee, A.
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Emig, K. L.
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Gaunekar, A. N.
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Jozsa, G. I. G.
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Klutse, D. Y.
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Knowles, K.
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Krogager, J. -k.
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Mohapatra, A.
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Moodley, K.
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Muller, Sebastie ...
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Noterdaeme, P.
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Petitjean, P.
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Salas, P.
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Sikhosana, S.
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Chalmers University of Technology