Planck early results. XIII: Statistical properties of extragalactic radio sources in the Planck Early Release Compact Source Catalogue

J. González-Nuevo (Corresponding Author), Jussi Tuovinen, Jussi Varis, Planck Collaboration

Research output: Contribution to journalArticleScientificpeer-review

41 Citations (Scopus)

Abstract

The data reported in Planck’s Early Release Compact Source Catalogue (ERCSC) are exploited to measure the number counts (dN/dS) of extragalactic radio sources at 30, 44, 70, 100, 143 and 217 GHz. Due to the full-sky nature of the catalogue, this measurement extends to the rarest and brightest sources in the sky. At lower frequencies (30, 44, and 70 GHz) our counts are in very good agreement with estimates based on WMAP data, being somewhat deeper at 30 and 70 GHz, and somewhat shallower at 44 GHz. Planck’s source counts at 143 and 217 GHz join smoothly with the fainter ones provided by the SPT and ACT surveys over small fractions of the sky. An analysis of source spectra, exploiting Planck’s uniquely broad spectral coverage, finds clear evidence of a steepening of the mean spectral index above about 70 GHz. This implies that, at these frequencies, the contamination of the CMB power spectrum by radio sources below the detection limit is significantly lower than previously estimated.
Original languageEnglish
Article numberA13
Number of pages10
JournalAstronomy and Astrophysics
Volume536
DOIs
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed

Fingerprint

extragalactic radio sources
catalogs
radio
sky
power spectra
contamination
low frequencies
estimates
detection
analysis
index

Keywords

  • Surveys
  • radio continuum: general
  • galaxies:active

Cite this

@article{f9420a445603492c817fb4e6c72b3034,
title = "Planck early results. XIII: Statistical properties of extragalactic radio sources in the Planck Early Release Compact Source Catalogue",
abstract = "The data reported in Planck’s Early Release Compact Source Catalogue (ERCSC) are exploited to measure the number counts (dN/dS) of extragalactic radio sources at 30, 44, 70, 100, 143 and 217 GHz. Due to the full-sky nature of the catalogue, this measurement extends to the rarest and brightest sources in the sky. At lower frequencies (30, 44, and 70 GHz) our counts are in very good agreement with estimates based on WMAP data, being somewhat deeper at 30 and 70 GHz, and somewhat shallower at 44 GHz. Planck’s source counts at 143 and 217 GHz join smoothly with the fainter ones provided by the SPT and ACT surveys over small fractions of the sky. An analysis of source spectra, exploiting Planck’s uniquely broad spectral coverage, finds clear evidence of a steepening of the mean spectral index above about 70 GHz. This implies that, at these frequencies, the contamination of the CMB power spectrum by radio sources below the detection limit is significantly lower than previously estimated.",
keywords = "Surveys, radio continuum: general, galaxies:active",
author = "P.A.R. Ade and N. Aghanim and J. Gonz{\'a}lez-Nuevo and Jussi Tuovinen and Jussi Varis and {Planck Collaboration}",
note = "Project code: 18080",
year = "2011",
doi = "10.1051/0004-6361/201116471",
language = "English",
volume = "536",
journal = "Astronomy and Astrophysics",
issn = "0004-6361",
publisher = "EDP Sciences",

}

Planck early results. XIII : Statistical properties of extragalactic radio sources in the Planck Early Release Compact Source Catalogue. / González-Nuevo, J. (Corresponding Author); Tuovinen, Jussi; Varis, Jussi; Planck Collaboration.

In: Astronomy and Astrophysics, Vol. 536, A13, 2011.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Planck early results. XIII

T2 - Statistical properties of extragalactic radio sources in the Planck Early Release Compact Source Catalogue

AU - Ade, P.A.R.

AU - Aghanim, N.

AU - González-Nuevo, J.

AU - Tuovinen, Jussi

AU - Varis, Jussi

AU - Planck Collaboration

N1 - Project code: 18080

PY - 2011

Y1 - 2011

N2 - The data reported in Planck’s Early Release Compact Source Catalogue (ERCSC) are exploited to measure the number counts (dN/dS) of extragalactic radio sources at 30, 44, 70, 100, 143 and 217 GHz. Due to the full-sky nature of the catalogue, this measurement extends to the rarest and brightest sources in the sky. At lower frequencies (30, 44, and 70 GHz) our counts are in very good agreement with estimates based on WMAP data, being somewhat deeper at 30 and 70 GHz, and somewhat shallower at 44 GHz. Planck’s source counts at 143 and 217 GHz join smoothly with the fainter ones provided by the SPT and ACT surveys over small fractions of the sky. An analysis of source spectra, exploiting Planck’s uniquely broad spectral coverage, finds clear evidence of a steepening of the mean spectral index above about 70 GHz. This implies that, at these frequencies, the contamination of the CMB power spectrum by radio sources below the detection limit is significantly lower than previously estimated.

AB - The data reported in Planck’s Early Release Compact Source Catalogue (ERCSC) are exploited to measure the number counts (dN/dS) of extragalactic radio sources at 30, 44, 70, 100, 143 and 217 GHz. Due to the full-sky nature of the catalogue, this measurement extends to the rarest and brightest sources in the sky. At lower frequencies (30, 44, and 70 GHz) our counts are in very good agreement with estimates based on WMAP data, being somewhat deeper at 30 and 70 GHz, and somewhat shallower at 44 GHz. Planck’s source counts at 143 and 217 GHz join smoothly with the fainter ones provided by the SPT and ACT surveys over small fractions of the sky. An analysis of source spectra, exploiting Planck’s uniquely broad spectral coverage, finds clear evidence of a steepening of the mean spectral index above about 70 GHz. This implies that, at these frequencies, the contamination of the CMB power spectrum by radio sources below the detection limit is significantly lower than previously estimated.

KW - Surveys

KW - radio continuum: general

KW - galaxies:active

U2 - 10.1051/0004-6361/201116471

DO - 10.1051/0004-6361/201116471

M3 - Article

VL - 536

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

M1 - A13

ER -