Search: onr:"swepub:oai:research.chalmers.se:bea11b21-137c-4ae1-b472-508255ce57cf" >
Identifying active ...
-
Morabito, Leah K.Durham University
(author)
Identifying active galactic nuclei via brightness temperature with sub-arcsecond international LOFAR telescope observations
- Article/chapterEnglish2022
Publisher, publication year, extent ...
-
2022-07-29
-
Oxford University Press (OUP),2022
-
electronicrdacarrier
Numbers
-
LIBRIS-ID:oai:research.chalmers.se:bea11b21-137c-4ae1-b472-508255ce57cf
-
https://doi.org/10.1093/mnras/stac2129DOI
-
https://research.chalmers.se/publication/532136URI
Supplementary language notes
-
Language:English
-
Summary in:English
Part of subdatabase
Classification
-
Subject category:art swepub-publicationtype
-
Subject category:ref swepub-contenttype
Notes
-
Identifying active galactic nuclei (AGNs) and isolating their contribution to a galaxy's energy budget is crucial for studying the co-evolution of AGNs and their host galaxies. Brightness temperature (T-b) measurements from high-resolution radio observations at GHz frequencies are widely used to identify AGNs. Here, we investigate using new sub-arcsecond imaging at 144 MHz with the International LOFAR Telescope to identify AGNs using T-b in the Lockman Hole field. We use ancillary data to validate the 940 AGN identifications, finding 83 percent of sources have AGN classifications from SED fitting and/or photometric identifications, yielding 160 new AGN identifications. Considering the multiwavelength classifications, brightness temperature criteria select over half of radio-excess sources, 32 percent of sources classified as radio-quiet AGNs, and 20 percent of sources classified as star-forming galaxies. Infrared colour-colour plots and comparison with what we would expect to detect based on peak brightness in 6 arcsec LOFAR maps imply that the star-forming galaxies and sources at low flux densities have a mixture of star-formation and AGN activity. We separate the radio emission from star-formation and AGN in unresolved, T-b-identified AGNs with no significant radio excess and find the AGN comprises 0.49 +/- 0.16 of the radio luminosity. Overall, the non-radio excess AGNs show evidence for having a variety of different radio emission mechanisms, which can provide different pathways for AGNs and galaxy co-evolution. This validation of AGN identification using brightness temperature at low frequencies opens the possibility for securely selecting AGN samples where ancillary data are inadequate.
Subject headings and genre
Added entries (persons, corporate bodies, meetings, titles ...)
-
Sweijen, F.Universiteit Leiden (UL),Leiden University (UL)
(author)
-
Radcliffe, J. F.University of Manchester,Universiteit van Pretoria,University of Pretoria
(author)
-
Best, P. N.Royal Observatory
(author)
-
Kondapally, RohitRoyal Observatory
(author)
-
Bondi, MarcoIstituto nazionale di astrofisica (INAF)
(author)
-
Bonato, MatteoIstituto nazionale di astrofisica (INAF)
(author)
-
Duncan, K. J.Royal Observatory
(author)
-
Prandoni, IsabellaIstituto nazionale di astrofisica (INAF)
(author)
-
Shimwell, T. W.Universiteit Leiden (UL),Leiden University (UL),Netherlands Institute for Radio Astronomy (ASTRON)
(author)
-
Williams, W. L.Universiteit Leiden (UL),Leiden University (UL)
(author)
-
van Weeren, R. J.Universiteit Leiden (UL),Leiden University (UL)
(author)
-
Conway, John,1963Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)jconway
(author)
-
Rivera, G. CalistroEuropean Southern Observatory Santiago
(author)
-
Durham UniversityUniversiteit Leiden (UL)
(creator_code:org_t)
Related titles
-
In:Monthly Notices of the Royal Astronomical Society: Oxford University Press (OUP)515:4, s. 5758-57740035-87111365-2966
Internet link
Find in a library
To the university's database
- By the author/editor
-
Morabito, Leah K ...
-
Sweijen, F.
-
Radcliffe, J. F.
-
Best, P. N.
-
Kondapally, Rohi ...
-
Bondi, Marco
-
show more...
-
Bonato, Matteo
-
Duncan, K. J.
-
Prandoni, Isabel ...
-
Shimwell, T. W.
-
Williams, W. L.
-
van Weeren, R. J ...
-
Conway, John, 19 ...
-
Rivera, G. Calis ...
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Astronomy Astrop ...
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Atom and Molecul ...
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Other Physics To ...
- Articles in the publication
-
Monthly Notices ...
- By the university
-
Chalmers University of Technology