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Host galaxy contribution to the colours of ‘red’ quasars

Masci, F. J. and Webster, R. L. and Francis, P. J. (1998) Host galaxy contribution to the colours of ‘red’ quasars. Monthly Notices of the Royal Astronomical Society, 301 (4). pp. 975-984. ISSN 0035-8711. doi:10.1046/j.1365-8711.1998.02088.x.

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We describe an algorithm that measures self-consistently the relative galaxy contribution in a sample of radio quasars from their optical spectra alone. This is based on a spectral fitting method which uses the size of the characteristic 4000 Å feature of elliptical galaxy spectral energy distributions. We apply this method to the Parkes half-Jansky flat-spectrum sample of Drinkwater et al. to determine whether emission from the host galaxy can significantly contribute to the very red optical to near-infrared colours observed. We find that at around 2σ confidence, most of the reddening in unresolved (mostly quasar-like) sources is unlikely to be the result of contamination by a red stellar component.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Masci, F. J.0000-0002-8532-9395
Additional Information:© 1998 RAS. Accepted 1998 August 10. Received 1998 July 6; in original form 1998 March 16. Published: 21 December 1998. FJM acknowledges support from an APRA Scholarship, and RLW from an ARC research grant.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
University of New South WalesUNSPECIFIED
Australian Research CouncilUNSPECIFIED
Subject Keywords:methods: analytical, galaxies: fundamental parameters, quasars: general
Issue or Number:4
Record Number:CaltechAUTHORS:20200524-102106425
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Official Citation:F. J. Masci, R. L. Webster, P. J. Francis, Host galaxy contribution to the colours of ‘red’ quasars, Monthly Notices of the Royal Astronomical Society, Volume 301, Issue 4, December 1998, Pages 975–984,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103429
Deposited By: Rebecca Minjarez
Deposited On:26 May 2020 16:37
Last Modified:16 Nov 2021 18:21

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