Planck early results. XV: Spectral energy distributions and radio continuum spectra of northern extragalactic radio sources

Planck Collaboration

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Spectral energy distributions (SEDs) and radio continuum spectra are presented for a northern sample of 104 extragalactic radio sources, based on the Planck Early Release Compact Source Catalogue (ERCSC) and simultaneous multifrequency data. The nine Planck frequencies, from 30 to 857 GHz, are complemented by a set of simultaneous observations ranging from radio to gamma-rays. This is the first extensive frequency coverage in the radio and millimetre domains for an essentially complete sample of extragalactic radio sources, and it shows how the individual shocks, each in their own phase of development, shape the radio spectra as they move in the relativistic jet. The SEDs presented in this paper were fitted with second and third degree polynomials to estimate the frequencies of the synchrotron and inverse Compton (IC) peaks, and the spectral indices of low and high frequency radio data, including the Planck ERCSC data, were calculated. SED modelling methods are discussed, with an emphasis on proper, physical modelling of the synchrotron bump using multiple components. Planck ERCSC data also suggest that the original accelerated electron energy spectrum could be much harder than commonly thought, with power-law indexaround 1.5 instead of the canonical 2.5. The implications of this are discussed for the acceleration mechanisms effective in blazar shocks. Furthermore in many cases the Planck data indicate that gamma-ray emission must originate in the same shocks that produce the radio emission.
Original languageEnglish
Article numberA15
Number of pages56
JournalAstronomy and Astrophysics
Volume536
DOIs
Publication statusPublished - 12 Dec 2011
MoE publication typeNot Eligible

Fingerprint

extragalactic radio sources
spectral energy distribution
catalogs
shock
radio
continuums
synchrotrons
gamma rays
energy
radio spectra
radio emission
polynomials
energy spectra
electron energy
low frequencies
estimates
distribution
modeling
power law
electron

Keywords

  • active
  • BL Lacertae objects
  • Galaxies
  • general
  • non-thermal
  • Quasars: general
  • Radiation mechanisms

Cite this

@article{2696ba7888e944f3a42f95a3c1ff56cf,
title = "Planck early results. XV: Spectral energy distributions and radio continuum spectra of northern extragalactic radio sources",
abstract = "Spectral energy distributions (SEDs) and radio continuum spectra are presented for a northern sample of 104 extragalactic radio sources, based on the Planck Early Release Compact Source Catalogue (ERCSC) and simultaneous multifrequency data. The nine Planck frequencies, from 30 to 857 GHz, are complemented by a set of simultaneous observations ranging from radio to gamma-rays. This is the first extensive frequency coverage in the radio and millimetre domains for an essentially complete sample of extragalactic radio sources, and it shows how the individual shocks, each in their own phase of development, shape the radio spectra as they move in the relativistic jet. The SEDs presented in this paper were fitted with second and third degree polynomials to estimate the frequencies of the synchrotron and inverse Compton (IC) peaks, and the spectral indices of low and high frequency radio data, including the Planck ERCSC data, were calculated. SED modelling methods are discussed, with an emphasis on proper, physical modelling of the synchrotron bump using multiple components. Planck ERCSC data also suggest that the original accelerated electron energy spectrum could be much harder than commonly thought, with power-law indexaround 1.5 instead of the canonical 2.5. The implications of this are discussed for the acceleration mechanisms effective in blazar shocks. Furthermore in many cases the Planck data indicate that gamma-ray emission must originate in the same shocks that produce the radio emission.",
keywords = "active, BL Lacertae objects, Galaxies, general, non-thermal, Quasars: general, Radiation mechanisms",
author = "J. Aatrokoski and Ade, {P. A.R.} and N. Aghanim and Aller, {H. D.} and Aller, {M. F.} and E. Angelakis and M. Arnaud and M. Ashdown and J. Aumont and C. Baccigalupi and A. Balbi and Banday, {A. J.} and Barreiro, {R. B.} and Bartlett, {J. G.} and E. Battaner and K. Benabed and A. Beno{\^i}t and A. Berdyugin and Bernard, {J. P.} and M. Bersanelli and R. Bhatia and A. Bonaldi and L. Bonavera and Bond, {J. R.} and J. Borrill and Bouchet, {F. R.} and M. Bucher and C. Burigana and Burrows, {D. N.} and P. Cabella and M. Capalbi and B. Cappellini and Cardoso, {J. F.} and A. Catalano and E. Cavazzuti and L. Cay{\'o}n and A. Challinor and A. Chamballu and Chary, {R. R.} and Chiang, {L. Y.} and Christensen, {P. R.} and Clements, {D. L.} and S. Colafrancesco and S. Colombi and F. Couchot and A. Coulais and S. Cutini and F. Cuttaia and L. Danese and Jussi Varis and {Planck Collaboration}",
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year = "2011",
month = "12",
day = "12",
doi = "10.1051/0004-6361/201116466",
language = "English",
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journal = "Astronomy and Astrophysics",
issn = "0004-6361",
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}

Planck early results. XV : Spectral energy distributions and radio continuum spectra of northern extragalactic radio sources. / Planck Collaboration.

In: Astronomy and Astrophysics, Vol. 536, A15, 12.12.2011.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Planck early results. XV

T2 - Spectral energy distributions and radio continuum spectra of northern extragalactic radio sources

AU - Aatrokoski, J.

AU - Ade, P. A.R.

AU - Aghanim, N.

AU - Aller, H. D.

AU - Aller, M. F.

AU - Angelakis, E.

AU - Arnaud, M.

AU - Ashdown, M.

AU - Aumont, J.

AU - Baccigalupi, C.

AU - Balbi, A.

AU - Banday, A. J.

AU - Barreiro, R. B.

AU - Bartlett, J. G.

AU - Battaner, E.

AU - Benabed, K.

AU - Benoît, A.

AU - Berdyugin, A.

AU - Bernard, J. P.

AU - Bersanelli, M.

AU - Bhatia, R.

AU - Bonaldi, A.

AU - Bonavera, L.

AU - Bond, J. R.

AU - Borrill, J.

AU - Bouchet, F. R.

AU - Bucher, M.

AU - Burigana, C.

AU - Burrows, D. N.

AU - Cabella, P.

AU - Capalbi, M.

AU - Cappellini, B.

AU - Cardoso, J. F.

AU - Catalano, A.

AU - Cavazzuti, E.

AU - Cayón, L.

AU - Challinor, A.

AU - Chamballu, A.

AU - Chary, R. R.

AU - Chiang, L. Y.

AU - Christensen, P. R.

AU - Clements, D. L.

AU - Colafrancesco, S.

AU - Colombi, S.

AU - Couchot, F.

AU - Coulais, A.

AU - Cutini, S.

AU - Cuttaia, F.

AU - Danese, L.

AU - Varis, Jussi

AU - Planck Collaboration

N1 - Project code: 18080

PY - 2011/12/12

Y1 - 2011/12/12

N2 - Spectral energy distributions (SEDs) and radio continuum spectra are presented for a northern sample of 104 extragalactic radio sources, based on the Planck Early Release Compact Source Catalogue (ERCSC) and simultaneous multifrequency data. The nine Planck frequencies, from 30 to 857 GHz, are complemented by a set of simultaneous observations ranging from radio to gamma-rays. This is the first extensive frequency coverage in the radio and millimetre domains for an essentially complete sample of extragalactic radio sources, and it shows how the individual shocks, each in their own phase of development, shape the radio spectra as they move in the relativistic jet. The SEDs presented in this paper were fitted with second and third degree polynomials to estimate the frequencies of the synchrotron and inverse Compton (IC) peaks, and the spectral indices of low and high frequency radio data, including the Planck ERCSC data, were calculated. SED modelling methods are discussed, with an emphasis on proper, physical modelling of the synchrotron bump using multiple components. Planck ERCSC data also suggest that the original accelerated electron energy spectrum could be much harder than commonly thought, with power-law indexaround 1.5 instead of the canonical 2.5. The implications of this are discussed for the acceleration mechanisms effective in blazar shocks. Furthermore in many cases the Planck data indicate that gamma-ray emission must originate in the same shocks that produce the radio emission.

AB - Spectral energy distributions (SEDs) and radio continuum spectra are presented for a northern sample of 104 extragalactic radio sources, based on the Planck Early Release Compact Source Catalogue (ERCSC) and simultaneous multifrequency data. The nine Planck frequencies, from 30 to 857 GHz, are complemented by a set of simultaneous observations ranging from radio to gamma-rays. This is the first extensive frequency coverage in the radio and millimetre domains for an essentially complete sample of extragalactic radio sources, and it shows how the individual shocks, each in their own phase of development, shape the radio spectra as they move in the relativistic jet. The SEDs presented in this paper were fitted with second and third degree polynomials to estimate the frequencies of the synchrotron and inverse Compton (IC) peaks, and the spectral indices of low and high frequency radio data, including the Planck ERCSC data, were calculated. SED modelling methods are discussed, with an emphasis on proper, physical modelling of the synchrotron bump using multiple components. Planck ERCSC data also suggest that the original accelerated electron energy spectrum could be much harder than commonly thought, with power-law indexaround 1.5 instead of the canonical 2.5. The implications of this are discussed for the acceleration mechanisms effective in blazar shocks. Furthermore in many cases the Planck data indicate that gamma-ray emission must originate in the same shocks that produce the radio emission.

KW - active

KW - BL Lacertae objects

KW - Galaxies

KW - general

KW - non-thermal

KW - Quasars: general

KW - Radiation mechanisms

U2 - 10.1051/0004-6361/201116466

DO - 10.1051/0004-6361/201116466

M3 - Article

AN - SCOPUS:82955188024

VL - 536

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

M1 - A15

ER -