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FR II Quasars: Infrared Properties, Star Formation Rates, and Extended Ionized Gas
Journal article   Open access   Peer reviewed

FR II Quasars: Infrared Properties, Star Formation Rates, and Extended Ionized Gas

Hai Fu and Alan Stockton
The Astrophysical journal, Vol.696(2), pp.1693-1699
02/10/2009
DOI: 10.1088/0004-637X/696/2/1693
url
https://doi.org/10.1088/0004-637X/696/2/1693View
Published (Version of record) Open Access

Abstract

Astrophys.J.696:1693-1699,2009 We present Spitzer IRS spectra and MIPS photometry of 12 radio-loud QSOs with FR II morphologies at z ~ 0.3. Six of the sources are surrounded by luminous extended emission-line regions (EELRs), while the other six do not have such extended nebulae. The two subsamples are indistinguishable in their mid-infrared spectra and overall infrared spectral energy distributions (SEDs). For both subsamples, the mid-infrared aromatic features are undetected in either individual sources or their stacked spectra, and the SEDs are consistent with pure quasar emission without significant star formation. The upper limits to the star formation rate are sufficiently low that starburst-driven superwinds can be ruled out as a mechanism for producing the EELRs, which are instead likely the result of the ejection of most of the gas from the system by blast waves accompanying the launching of the radio jets. The FR II quasars deviate systematically from the correlation between host galaxy star formation rate and black hole accretion rate apparently followed by radio-quiet QSOs, implying little or no bulge growth coeval with the current intensive black hole growth. We also present a new Spitzer estimate of the star formation rate for the starburst in the host galaxy of the compact steep-spectrum radio quasar 3C 48.
 Physics - Cosmology and Nongalactic Astrophysics

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