Thermal emission from warm dust in the most distant quasars

Ran Wang, Chris L. Carilli, Jeff Wagg, Frank Bertoldi, Fabian Walter, Karl M. Menten, Alain Omont, Pierre Cox, Michael A. Strauss, Xiaohui Fan, Linhua Jiang, Donald P. Schneider

Research output: Contribution to journalArticle

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Abstract

We report new continuum observations of 14 z ∼ 6 quasars at 250 GHz and 14 quasars at 1.4 GHz. We summarize all recent millimeter and radio observations of the sample of the 33 quasars known with 5.71 ≤ z ≤ 6.43 and present a study of the rest-frame far-infrared (FIR) properties of this sample. These quasars were observed with the Max Planck Millimeter Bolometer Array (MAMBO) at 250 GHz with mJy sensitivity, and 30% of them were detected. We also recover the average 250 GHz flux density of the MAMBO undetected sources at 4 σ by stacking the on-source measurements. The derived mean radio-to-UV spectral energy distributions (SEDs) of the full sample and the 250 GHz nondetections show no significant differences from lower redshift optical quasars. Obvious FIR excesses are seen in the individual SEDs of the strong 250 GHz detections, with FIR-to-radio emission ratios consistent with those of typical star-forming galaxies. Most 250 GHz-detected sources follow the L FIR-Lbol relationship derived from a sample of local IR-luminous quasars (LIR > 1012 l), while the average L-FIR/Lbol ratio of the nondetections is consistent with that of the optically selected PG quasars. The MAMBO detections also tend to have weaker Lya emission than the nondetected sources. We discuss possible FIR dust-heating sources and critically assess the possibility of active star formation in the host galaxies of the z ∼ 6 quasars. The average star formation rate of the MAMBO nondetections is likely to be less than a few hundred M yr-1, but in the strong detections, the host galaxy star formation is probably at a rate of ≳103 M yr-1, which dominates the FIR dust heating.

Original languageEnglish (US)
Pages (from-to)848-858
Number of pages11
JournalAstrophysical Journal
Volume687
Issue number2
DOIs
StatePublished - Nov 10 2008

Fingerprint

thermal emission
quasars
dust
bolometers
radio
heating
galaxies
spectral energy distribution
stacking
energy
star formation
radio observation
radio emission
star formation rate
detection
flux density
continuums
stars
distribution
rate

Keywords

  • Galaxies: evolution
  • Galaxies: high-redshift
  • Galaxies: starburst
  • Quasars: general
  • Submillimeter

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Wang, R., Carilli, C. L., Wagg, J., Bertoldi, F., Walter, F., Menten, K. M., ... Schneider, D. P. (2008). Thermal emission from warm dust in the most distant quasars. Astrophysical Journal, 687(2), 848-858. https://doi.org/10.1086/591076

Thermal emission from warm dust in the most distant quasars. / Wang, Ran; Carilli, Chris L.; Wagg, Jeff; Bertoldi, Frank; Walter, Fabian; Menten, Karl M.; Omont, Alain; Cox, Pierre; Strauss, Michael A.; Fan, Xiaohui; Jiang, Linhua; Schneider, Donald P.

In: Astrophysical Journal, Vol. 687, No. 2, 10.11.2008, p. 848-858.

Research output: Contribution to journalArticle

Wang, R, Carilli, CL, Wagg, J, Bertoldi, F, Walter, F, Menten, KM, Omont, A, Cox, P, Strauss, MA, Fan, X, Jiang, L & Schneider, DP 2008, 'Thermal emission from warm dust in the most distant quasars', Astrophysical Journal, vol. 687, no. 2, pp. 848-858. https://doi.org/10.1086/591076
Wang R, Carilli CL, Wagg J, Bertoldi F, Walter F, Menten KM et al. Thermal emission from warm dust in the most distant quasars. Astrophysical Journal. 2008 Nov 10;687(2):848-858. https://doi.org/10.1086/591076
Wang, Ran ; Carilli, Chris L. ; Wagg, Jeff ; Bertoldi, Frank ; Walter, Fabian ; Menten, Karl M. ; Omont, Alain ; Cox, Pierre ; Strauss, Michael A. ; Fan, Xiaohui ; Jiang, Linhua ; Schneider, Donald P. / Thermal emission from warm dust in the most distant quasars. In: Astrophysical Journal. 2008 ; Vol. 687, No. 2. pp. 848-858.
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abstract = "We report new continuum observations of 14 z ∼ 6 quasars at 250 GHz and 14 quasars at 1.4 GHz. We summarize all recent millimeter and radio observations of the sample of the 33 quasars known with 5.71 ≤ z ≤ 6.43 and present a study of the rest-frame far-infrared (FIR) properties of this sample. These quasars were observed with the Max Planck Millimeter Bolometer Array (MAMBO) at 250 GHz with mJy sensitivity, and 30{\%} of them were detected. We also recover the average 250 GHz flux density of the MAMBO undetected sources at 4 σ by stacking the on-source measurements. The derived mean radio-to-UV spectral energy distributions (SEDs) of the full sample and the 250 GHz nondetections show no significant differences from lower redshift optical quasars. Obvious FIR excesses are seen in the individual SEDs of the strong 250 GHz detections, with FIR-to-radio emission ratios consistent with those of typical star-forming galaxies. Most 250 GHz-detected sources follow the L FIR-Lbol relationship derived from a sample of local IR-luminous quasars (LIR > 1012 l⊙), while the average L-FIR/Lbol ratio of the nondetections is consistent with that of the optically selected PG quasars. The MAMBO detections also tend to have weaker Lya emission than the nondetected sources. We discuss possible FIR dust-heating sources and critically assess the possibility of active star formation in the host galaxies of the z ∼ 6 quasars. The average star formation rate of the MAMBO nondetections is likely to be less than a few hundred M⊙ yr-1, but in the strong detections, the host galaxy star formation is probably at a rate of ≳103 M ⊙ yr-1, which dominates the FIR dust heating.",
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AU - Bertoldi, Frank

AU - Walter, Fabian

AU - Menten, Karl M.

AU - Omont, Alain

AU - Cox, Pierre

AU - Strauss, Michael A.

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AU - Jiang, Linhua

AU - Schneider, Donald P.

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N2 - We report new continuum observations of 14 z ∼ 6 quasars at 250 GHz and 14 quasars at 1.4 GHz. We summarize all recent millimeter and radio observations of the sample of the 33 quasars known with 5.71 ≤ z ≤ 6.43 and present a study of the rest-frame far-infrared (FIR) properties of this sample. These quasars were observed with the Max Planck Millimeter Bolometer Array (MAMBO) at 250 GHz with mJy sensitivity, and 30% of them were detected. We also recover the average 250 GHz flux density of the MAMBO undetected sources at 4 σ by stacking the on-source measurements. The derived mean radio-to-UV spectral energy distributions (SEDs) of the full sample and the 250 GHz nondetections show no significant differences from lower redshift optical quasars. Obvious FIR excesses are seen in the individual SEDs of the strong 250 GHz detections, with FIR-to-radio emission ratios consistent with those of typical star-forming galaxies. Most 250 GHz-detected sources follow the L FIR-Lbol relationship derived from a sample of local IR-luminous quasars (LIR > 1012 l⊙), while the average L-FIR/Lbol ratio of the nondetections is consistent with that of the optically selected PG quasars. The MAMBO detections also tend to have weaker Lya emission than the nondetected sources. We discuss possible FIR dust-heating sources and critically assess the possibility of active star formation in the host galaxies of the z ∼ 6 quasars. The average star formation rate of the MAMBO nondetections is likely to be less than a few hundred M⊙ yr-1, but in the strong detections, the host galaxy star formation is probably at a rate of ≳103 M ⊙ yr-1, which dominates the FIR dust heating.

AB - We report new continuum observations of 14 z ∼ 6 quasars at 250 GHz and 14 quasars at 1.4 GHz. We summarize all recent millimeter and radio observations of the sample of the 33 quasars known with 5.71 ≤ z ≤ 6.43 and present a study of the rest-frame far-infrared (FIR) properties of this sample. These quasars were observed with the Max Planck Millimeter Bolometer Array (MAMBO) at 250 GHz with mJy sensitivity, and 30% of them were detected. We also recover the average 250 GHz flux density of the MAMBO undetected sources at 4 σ by stacking the on-source measurements. The derived mean radio-to-UV spectral energy distributions (SEDs) of the full sample and the 250 GHz nondetections show no significant differences from lower redshift optical quasars. Obvious FIR excesses are seen in the individual SEDs of the strong 250 GHz detections, with FIR-to-radio emission ratios consistent with those of typical star-forming galaxies. Most 250 GHz-detected sources follow the L FIR-Lbol relationship derived from a sample of local IR-luminous quasars (LIR > 1012 l⊙), while the average L-FIR/Lbol ratio of the nondetections is consistent with that of the optically selected PG quasars. The MAMBO detections also tend to have weaker Lya emission than the nondetected sources. We discuss possible FIR dust-heating sources and critically assess the possibility of active star formation in the host galaxies of the z ∼ 6 quasars. The average star formation rate of the MAMBO nondetections is likely to be less than a few hundred M⊙ yr-1, but in the strong detections, the host galaxy star formation is probably at a rate of ≳103 M ⊙ yr-1, which dominates the FIR dust heating.

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KW - Galaxies: high-redshift

KW - Galaxies: starburst

KW - Quasars: general

KW - Submillimeter

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