ASKAP commissioning observations of the GAMA 23 field

Denis A. Leahy, A. M. Hopkins, R. P. Norris, J. Marvil, J. D. Collier, E. N. Taylor, J. R. Allison, C. Anderson, M. Bell, M. Bilicki, J. Bland-Hawthorn, S. Brough, M. J. I. Brown, S. Driver, G. Gurkan, L. Harvey-Smith, I. Heywood, B. W. Holwerda, J. Liske, A. R. Lopez-Sanchez & 8 others D. McConnell, A. Moffett, M. S. Owers, K. A. Pimbblet, W. Raja, N. Seymour, M. A. Voronkov, L. Wang

Research output: Contribution to journalArticleResearchpeer-review

Abstract

We have observed the G23 field of the Galaxy AndMass Assembly (GAMA) survey using the Australian Square Kilometre Array Pathfinder (ASKAP) in its commissioning phase to validate the performance of the telescope and to characterise the detected galaxy populations. This observation covers ∼48 deg2 with synthesised beam of 32.7 arcsec by 17.8 arcsec at 936MHz, and ∼39 deg2 with synthesised beam of 15.8 arcsec by 12.0 arcsec at 1320MHz. At both frequencies, the root-mean-square (r.m.s.) noise is ∼0.1 mJy/beam. We combine these radio observations with the GAMA galaxy data, which includes spectroscopy of galaxies that are i-band selected with a magnitude limit of 19.2. Wide-field Infrared Survey Explorer (WISE) infrared (IR) photometry is used to determine which galaxies host an active galactic nucleus (AGN). In properties including source counts, mass distributions, and IR versus radio luminosity relation, the ASKAP-detected radio sources behave as expected. Radio galaxies have higher stellar mass and luminosity in IR, optical, and UV than other galaxies. We apply optical and IR AGN diagnostics and find that they disagree for ∼30% of the galaxies in our sample. We suggest possible causes for the disagreement. Some cases can be explained by optical extinction of the AGN, but for more than half of the cases we do not find a clear explanation. Radio sources aremore likely (∼6%) to have an AGN than radio quiet galaxies (∼1%), but the majority of AGN are not detected in radio at this sensitivity.

LanguageEnglish
Article number024
Number of pages19
JournalPublications of the Astronomical Society of Australia
Volume36
DOIs
Publication statusE-pub ahead of print - 19 Jul 2019

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assembly
radio
galaxies
active galactic nuclei
Wide-field Infrared Survey Explorer
stellar luminosity
infrared photometry
radio observation
radio galaxies
stellar mass
mass distribution
extinction
spectroscopy
luminosity
telescopes
causes
sensitivity

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Leahy, D. A., Hopkins, A. M., Norris, R. P., Marvil, J., Collier, J. D., Taylor, E. N., ... Wang, L. (2019). ASKAP commissioning observations of the GAMA 23 field. Publications of the Astronomical Society of Australia, 36, [024]. https://doi.org/10.1017/pasa.2019.16
Leahy, Denis A. ; Hopkins, A. M. ; Norris, R. P. ; Marvil, J. ; Collier, J. D. ; Taylor, E. N. ; Allison, J. R. ; Anderson, C. ; Bell, M. ; Bilicki, M. ; Bland-Hawthorn, J. ; Brough, S. ; Brown, M. J. I. ; Driver, S. ; Gurkan, G. ; Harvey-Smith, L. ; Heywood, I. ; Holwerda, B. W. ; Liske, J. ; Lopez-Sanchez, A. R. ; McConnell, D. ; Moffett, A. ; Owers, M. S. ; Pimbblet, K. A. ; Raja, W. ; Seymour, N. ; Voronkov, M. A. ; Wang, L. / ASKAP commissioning observations of the GAMA 23 field. In: Publications of the Astronomical Society of Australia. 2019 ; Vol. 36.
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title = "ASKAP commissioning observations of the GAMA 23 field",
abstract = "We have observed the G23 field of the Galaxy AndMass Assembly (GAMA) survey using the Australian Square Kilometre Array Pathfinder (ASKAP) in its commissioning phase to validate the performance of the telescope and to characterise the detected galaxy populations. This observation covers ∼48 deg2 with synthesised beam of 32.7 arcsec by 17.8 arcsec at 936MHz, and ∼39 deg2 with synthesised beam of 15.8 arcsec by 12.0 arcsec at 1320MHz. At both frequencies, the root-mean-square (r.m.s.) noise is ∼0.1 mJy/beam. We combine these radio observations with the GAMA galaxy data, which includes spectroscopy of galaxies that are i-band selected with a magnitude limit of 19.2. Wide-field Infrared Survey Explorer (WISE) infrared (IR) photometry is used to determine which galaxies host an active galactic nucleus (AGN). In properties including source counts, mass distributions, and IR versus radio luminosity relation, the ASKAP-detected radio sources behave as expected. Radio galaxies have higher stellar mass and luminosity in IR, optical, and UV than other galaxies. We apply optical and IR AGN diagnostics and find that they disagree for ∼30{\%} of the galaxies in our sample. We suggest possible causes for the disagreement. Some cases can be explained by optical extinction of the AGN, but for more than half of the cases we do not find a clear explanation. Radio sources aremore likely (∼6{\%}) to have an AGN than radio quiet galaxies (∼1{\%}), but the majority of AGN are not detected in radio at this sensitivity.",
keywords = "active - galaxies, galaxies, galaxies - radio continuum, galaxies - surveys, statistics - infrared",
author = "Leahy, {Denis A.} and Hopkins, {A. M.} and Norris, {R. P.} and J. Marvil and Collier, {J. D.} and Taylor, {E. N.} and Allison, {J. R.} and C. Anderson and M. Bell and M. Bilicki and J. Bland-Hawthorn and S. Brough and Brown, {M. J. I.} and S. Driver and G. Gurkan and L. Harvey-Smith and I. Heywood and Holwerda, {B. W.} and J. Liske and Lopez-Sanchez, {A. R.} and D. McConnell and A. Moffett and Owers, {M. S.} and Pimbblet, {K. A.} and W. Raja and N. Seymour and Voronkov, {M. A.} and L. Wang",
year = "2019",
month = "7",
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Leahy, DA, Hopkins, AM, Norris, RP, Marvil, J, Collier, JD, Taylor, EN, Allison, JR, Anderson, C, Bell, M, Bilicki, M, Bland-Hawthorn, J, Brough, S, Brown, MJI, Driver, S, Gurkan, G, Harvey-Smith, L, Heywood, I, Holwerda, BW, Liske, J, Lopez-Sanchez, AR, McConnell, D, Moffett, A, Owers, MS, Pimbblet, KA, Raja, W, Seymour, N, Voronkov, MA & Wang, L 2019, 'ASKAP commissioning observations of the GAMA 23 field' Publications of the Astronomical Society of Australia, vol. 36, 024. https://doi.org/10.1017/pasa.2019.16

ASKAP commissioning observations of the GAMA 23 field. / Leahy, Denis A.; Hopkins, A. M.; Norris, R. P.; Marvil, J.; Collier, J. D.; Taylor, E. N.; Allison, J. R.; Anderson, C.; Bell, M.; Bilicki, M.; Bland-Hawthorn, J.; Brough, S.; Brown, M. J. I.; Driver, S.; Gurkan, G.; Harvey-Smith, L.; Heywood, I.; Holwerda, B. W.; Liske, J.; Lopez-Sanchez, A. R.; McConnell, D.; Moffett, A.; Owers, M. S.; Pimbblet, K. A.; Raja, W.; Seymour, N.; Voronkov, M. A.; Wang, L.

In: Publications of the Astronomical Society of Australia, Vol. 36, 024, 19.07.2019.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - ASKAP commissioning observations of the GAMA 23 field

AU - Leahy,Denis A.

AU - Hopkins,A. M.

AU - Norris,R. P.

AU - Marvil,J.

AU - Collier,J. D.

AU - Taylor,E. N.

AU - Allison,J. R.

AU - Anderson,C.

AU - Bell,M.

AU - Bilicki,M.

AU - Bland-Hawthorn,J.

AU - Brough,S.

AU - Brown,M. J. I.

AU - Driver,S.

AU - Gurkan,G.

AU - Harvey-Smith,L.

AU - Heywood,I.

AU - Holwerda,B. W.

AU - Liske,J.

AU - Lopez-Sanchez,A. R.

AU - McConnell,D.

AU - Moffett,A.

AU - Owers,M. S.

AU - Pimbblet,K. A.

AU - Raja,W.

AU - Seymour,N.

AU - Voronkov,M. A.

AU - Wang,L.

PY - 2019/7/19

Y1 - 2019/7/19

N2 - We have observed the G23 field of the Galaxy AndMass Assembly (GAMA) survey using the Australian Square Kilometre Array Pathfinder (ASKAP) in its commissioning phase to validate the performance of the telescope and to characterise the detected galaxy populations. This observation covers ∼48 deg2 with synthesised beam of 32.7 arcsec by 17.8 arcsec at 936MHz, and ∼39 deg2 with synthesised beam of 15.8 arcsec by 12.0 arcsec at 1320MHz. At both frequencies, the root-mean-square (r.m.s.) noise is ∼0.1 mJy/beam. We combine these radio observations with the GAMA galaxy data, which includes spectroscopy of galaxies that are i-band selected with a magnitude limit of 19.2. Wide-field Infrared Survey Explorer (WISE) infrared (IR) photometry is used to determine which galaxies host an active galactic nucleus (AGN). In properties including source counts, mass distributions, and IR versus radio luminosity relation, the ASKAP-detected radio sources behave as expected. Radio galaxies have higher stellar mass and luminosity in IR, optical, and UV than other galaxies. We apply optical and IR AGN diagnostics and find that they disagree for ∼30% of the galaxies in our sample. We suggest possible causes for the disagreement. Some cases can be explained by optical extinction of the AGN, but for more than half of the cases we do not find a clear explanation. Radio sources aremore likely (∼6%) to have an AGN than radio quiet galaxies (∼1%), but the majority of AGN are not detected in radio at this sensitivity.

AB - We have observed the G23 field of the Galaxy AndMass Assembly (GAMA) survey using the Australian Square Kilometre Array Pathfinder (ASKAP) in its commissioning phase to validate the performance of the telescope and to characterise the detected galaxy populations. This observation covers ∼48 deg2 with synthesised beam of 32.7 arcsec by 17.8 arcsec at 936MHz, and ∼39 deg2 with synthesised beam of 15.8 arcsec by 12.0 arcsec at 1320MHz. At both frequencies, the root-mean-square (r.m.s.) noise is ∼0.1 mJy/beam. We combine these radio observations with the GAMA galaxy data, which includes spectroscopy of galaxies that are i-band selected with a magnitude limit of 19.2. Wide-field Infrared Survey Explorer (WISE) infrared (IR) photometry is used to determine which galaxies host an active galactic nucleus (AGN). In properties including source counts, mass distributions, and IR versus radio luminosity relation, the ASKAP-detected radio sources behave as expected. Radio galaxies have higher stellar mass and luminosity in IR, optical, and UV than other galaxies. We apply optical and IR AGN diagnostics and find that they disagree for ∼30% of the galaxies in our sample. We suggest possible causes for the disagreement. Some cases can be explained by optical extinction of the AGN, but for more than half of the cases we do not find a clear explanation. Radio sources aremore likely (∼6%) to have an AGN than radio quiet galaxies (∼1%), but the majority of AGN are not detected in radio at this sensitivity.

KW - active - galaxies

KW - galaxies

KW - galaxies - radio continuum

KW - galaxies - surveys

KW - statistics - infrared

UR - http://www.scopus.com/inward/record.url?scp=85069503025&partnerID=8YFLogxK

U2 - 10.1017/pasa.2019.16

DO - 10.1017/pasa.2019.16

M3 - Article

VL - 36

JO - Publications of the Astronomical Society of Australia

T2 - Publications of the Astronomical Society of Australia

JF - Publications of the Astronomical Society of Australia

SN - 1323-3580

M1 - 024

ER -