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The mm-wave compact component of an AGN

The mm-wave compact component of an AGN
The mm-wave compact component of an AGN

mm-wave emission from active galactic nuclei (AGNs) may hold the key to understanding the physical origin of their radio cores. The correlation between radio/mm and X-ray luminosity may suggest a similar physical origin of the two sources. Since synchrotron self-absorption decreases with frequency, mm-waves probe smaller length-scales than cm-waves. We report on 100 GHz (3 mm) observations with the Combined Array for Research in Millimeter-wave Astronomy of 26AGNs selected from the hardX-ray Swift/Burst Alert Telescope survey. 20/26 targets were detected at 100 GHz down to the 1 mJy (3σ) sensitivity, which corresponds to optically thick synchrotron source sizes of 10-4-10-3 pc. Most sources show a 100 GHz flux excess with respect to the spectral slope extrapolated from low frequencies. This mm spectral component likely originates from smaller scales than the few-GHz emission. The measured mm sources lie roughly around the Lmm (100 GHz) ~10-4LX (2-10 keV) relation, similar to a few previously published X-ray selected sources, and hinting perhaps at a common coronal origin.

Galaxies: Active, Galaxies: Jets, Galaxies: Nuclei, Radio continuum: Galaxies, X-rays: Galaxies
0035-8711
399-406
Behar, Ehud
04fd38d9-e172-4ae9-a530-9418b301e041
Vogel, Stuart
a9ce8d08-ad14-448d-aa74-8e55f37a83cf
Baldi, Ranieri D.
c416ed4c-5d1c-48ee-989c-3a8ab38cd124
Smith, Krista L.
35a37ba7-bf4e-4d5f-b573-1ac3cac54543
Mushotzky, Richard F.
0b8f11ee-414b-40ed-b677-6c4398c26a92
Behar, Ehud
04fd38d9-e172-4ae9-a530-9418b301e041
Vogel, Stuart
a9ce8d08-ad14-448d-aa74-8e55f37a83cf
Baldi, Ranieri D.
c416ed4c-5d1c-48ee-989c-3a8ab38cd124
Smith, Krista L.
35a37ba7-bf4e-4d5f-b573-1ac3cac54543
Mushotzky, Richard F.
0b8f11ee-414b-40ed-b677-6c4398c26a92

Behar, Ehud, Vogel, Stuart, Baldi, Ranieri D., Smith, Krista L. and Mushotzky, Richard F. (2018) The mm-wave compact component of an AGN. Monthly Notices of the Royal Astronomical Society, 478 (1), 399-406. (doi:10.1093/mnras/sty850).

Record type: Article

Abstract

mm-wave emission from active galactic nuclei (AGNs) may hold the key to understanding the physical origin of their radio cores. The correlation between radio/mm and X-ray luminosity may suggest a similar physical origin of the two sources. Since synchrotron self-absorption decreases with frequency, mm-waves probe smaller length-scales than cm-waves. We report on 100 GHz (3 mm) observations with the Combined Array for Research in Millimeter-wave Astronomy of 26AGNs selected from the hardX-ray Swift/Burst Alert Telescope survey. 20/26 targets were detected at 100 GHz down to the 1 mJy (3σ) sensitivity, which corresponds to optically thick synchrotron source sizes of 10-4-10-3 pc. Most sources show a 100 GHz flux excess with respect to the spectral slope extrapolated from low frequencies. This mm spectral component likely originates from smaller scales than the few-GHz emission. The measured mm sources lie roughly around the Lmm (100 GHz) ~10-4LX (2-10 keV) relation, similar to a few previously published X-ray selected sources, and hinting perhaps at a common coronal origin.

Text
1803.06877v1 (1) - Accepted Manuscript
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More information

Accepted/In Press date: 22 March 2018
e-pub ahead of print date: 11 May 2018
Published date: 21 July 2018
Additional Information: Author Baldi UOS confirmed Arxiv record 1802.08581 is AM.
Keywords: Galaxies: Active, Galaxies: Jets, Galaxies: Nuclei, Radio continuum: Galaxies, X-rays: Galaxies

Identifiers

Local EPrints ID: 422311
URI: http://eprints.soton.ac.uk/id/eprint/422311
ISSN: 0035-8711
PURE UUID: 16ba7a01-1c9f-4df4-bf33-2e54e6293605

Catalogue record

Date deposited: 20 Jul 2018 16:31
Last modified: 16 Dec 2019 18:08

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Contributors

Author: Ehud Behar
Author: Stuart Vogel
Author: Krista L. Smith
Author: Richard F. Mushotzky

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