Multifrequency Studies of Active Galactic Nuclei in the Planck Satellite Era

Multifrequency Studies of Active Galactic Nuclei in the Planck Satellite Era

The multi-epoch single-survey Planck satellite data have given a rare glimpse into how the radio spectra of active galactic nuclei (AGN) evolve in time. Using Planck and simultaneous auxiliary radio data ranging from 1 GHz to 857 GHz, spectra for 104 bright northern extragalactic radio sources (most...

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Main Authors: Anne Lähteenmäki, the Planck Collaboration
Format: Article
Language:English
Published: MDPI AG 2016-10-01
Series:Galaxies
Subjects:
active galactic nuclei
radio spectra
relativistic jets
Online Access:http://www.mdpi.com/2075-4434/4/4/49
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spelling doaj-fd79db834db246f4b977aa92d05229942020-11-24T22:49:52ZengMDPI AGGalaxies2075-44342016-10-01444910.3390/galaxies4040049galaxies4040049Multifrequency Studies of Active Galactic Nuclei in the Planck Satellite EraAnne Lähteenmäki0the Planck Collaboration1Aalto University Metsähovi Radio Observatory & Department of Radio Science and Engineering, P.O. Box 13000, FI-00076 AALTO, FinlandAalto University Metsähovi Radio Observatory & Department of Radio Science and Engineering, P.O. Box 13000, FI-00076 AALTO, FinlandThe multi-epoch single-survey Planck satellite data have given a rare glimpse into how the radio spectra of active galactic nuclei (AGN) evolve in time. Using Planck and simultaneous auxiliary radio data ranging from 1 GHz to 857 GHz, spectra for 104 bright northern extragalactic radio sources (most of them AGN) have been assembled; in these, the various stages of flare development can be identified. The results are compared with theoretical models describing relativistic jets. Evidence for particularly flat high-frequency radio spectra is found, indicating a harder accelerated electron energy spectrum than usually assumed. A set of sources also shows signs of intrinsic cold dust.http://www.mdpi.com/2075-4434/4/4/49active galactic nucleiradio spectrarelativistic jets
collection DOAJ
language English
format Article
sources DOAJ
author Anne Lähteenmäki
the Planck Collaboration
spellingShingle Anne Lähteenmäki
the Planck Collaboration
Multifrequency Studies of Active Galactic Nuclei in the Planck Satellite Era
Galaxies
active galactic nuclei
radio spectra
relativistic jets
author_facet Anne Lähteenmäki
the Planck Collaboration
author_sort Anne Lähteenmäki
title Multifrequency Studies of Active Galactic Nuclei in the Planck Satellite Era
title_short Multifrequency Studies of Active Galactic Nuclei in the Planck Satellite Era
title_full Multifrequency Studies of Active Galactic Nuclei in the Planck Satellite Era
title_fullStr Multifrequency Studies of Active Galactic Nuclei in the Planck Satellite Era
title_full_unstemmed Multifrequency Studies of Active Galactic Nuclei in the Planck Satellite Era
title_sort multifrequency studies of active galactic nuclei in the planck satellite era
publisher MDPI AG
series Galaxies
issn 2075-4434
publishDate 2016-10-01
description The multi-epoch single-survey Planck satellite data have given a rare glimpse into how the radio spectra of active galactic nuclei (AGN) evolve in time. Using Planck and simultaneous auxiliary radio data ranging from 1 GHz to 857 GHz, spectra for 104 bright northern extragalactic radio sources (most of them AGN) have been assembled; in these, the various stages of flare development can be identified. The results are compared with theoretical models describing relativistic jets. Evidence for particularly flat high-frequency radio spectra is found, indicating a harder accelerated electron energy spectrum than usually assumed. A set of sources also shows signs of intrinsic cold dust.
topic active galactic nuclei
radio spectra
relativistic jets
url http://www.mdpi.com/2075-4434/4/4/49
work_keys_str_mv AT annelahteenmaki multifrequencystudiesofactivegalacticnucleiintheplancksatelliteera
AT theplanckcollaboration multifrequencystudiesofactivegalacticnucleiintheplancksatelliteera
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