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Near-Infrared Observations of Extended Emission around PG 1545+210

Neugebauer, G. and Matthews, K. and Armus, L. (1995) Near-Infrared Observations of Extended Emission around PG 1545+210. Astrophysical Journal, 455 (2). L123-L125. ISSN 0004-637X. doi:10.1086/309847.

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Infrared images at H and Ks of the quasar PG 1545+210 clearly show both extended emission centered on the quasar and a companion galaxy. The magnitudes of the extended emission deduced from these observations depend strongly on the model adopted for the emission. Both an exponential disk model and a de Vaucouleurs model provide adequate fits to the extended emission. If it is assumed to follow an exponential disk galaxy, these measurements imply that the host galaxy has absolute magnitudes comparable with those of a Schechter L^* galaxy. With this assumption for the intrinsic light distribution, the H magnitude and the Hubble Space Telescope limit on the V magnitude are inconsistent with color predictions for unreddened spiral galaxies at the redshift of the quasar. If the data are fitted to a de Vaucouleurs model, the extended emission dominates the total energy of the system and significantly exceeds that of an L^* galaxy. The companion galaxy has colors consistent with its being at the redshift of the quasar, but its luminosity is at most a small part of that of the entire system. If the companion is at the redshift of PG 1545+210, its absolute magnitude is M_H ∼ -22 mag, significantly fainter than that of an L^* galaxy.

Item Type:Article
Related URLs:
URLURL TypeDescription
Armus, L.0000-0003-3498-2973
Additional Information:© 1995 The American Astronomical Society. Received 1995 September 14; accepted 1995 October 4. We thank the staff of the Palomar Observatory for supporting these observations and J. Bahcall, R. Genzel, S. Kirhakos, K. McLeod, G. Rieke, D. Schneider, D. Shupe, B. T. Soifer, and A. Weinberger for helpful discussions. Infrared astrophysics at Caltech is supported by grants from the NSF and NASA.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Subject Keywords:galaxies: photometry; infrared: galaxies; quasars: general; quasars: individual (PG 1545+210)
Issue or Number:2
Record Number:CaltechAUTHORS:20170214-145151330
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Official Citation:G. Neugebauer et al 1995 ApJ 455 L123
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:74304
Deposited By: Ruth Sustaita
Deposited On:15 Feb 2017 05:09
Last Modified:11 Nov 2021 05:26

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