Article (Scientific journals)
On-axis spatially resolved spectroscopy of low redshift quasar host galaxies: HE 1503+0228, at z=0.135
Courbin, F.; Letawe, Géraldine; Magain, Pierre et al.
2002In Astronomy and Astrophysics, 394, p. 863-872
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Keywords :
galaxies: kinematics and dynamics; galaxies: stellar content; quasars: individual: HE 1503+0228 -; techniques: image processing
Abstract :
[en] We present the first result of a comprehensive spectroscopic study of quasar host galaxies. On-axis, spatially resolved spectra of low redshift quasars have been obtained with FORS1, mounted on the 8.2 m ESO Very Large Telescope, Antu. The spectra are spatially deconvolved using a spectroscopic version of the ``MCS deconvolution algorithm''. The algorithm decomposes two dimensional spectra into the individual spectra of the central point-like nucleus and of its host galaxy. Applied to HE 1503+0228 at z=0.135 (M[SUB]B[/SUB]=-23.0), it provides us with the spectrum of the host galaxy between 3600 Å and 8500 Å (rest-frame), at a mean resolving power of 700. The data allow us to measure several of the important Lick indices. The stellar populations and gas ionization state of the host galaxy of HE 1503+0228 are very similar to the ones measured for normal non-AGN galaxies. Dynamical information is also available for the gas and stellar components of the galaxy. Using deconvolution and a deprojection algorithm, velocity curves are derived for emission lines, from the center up to 4\arcsec away from the nucleus of the galaxy. Fitting a simple three-components mass model (point mass, spherical halo of dark matter, disk) to the position-velocity diagram, we infer a mass of M(r<1 kpc) = (2.0 +/- 0.3)x 10[SUP]10[/SUP] M[SUB]sun[/SUB] within the central kiloparsec of the galaxy, and a mass integrated over 10 kpc of M(r<10 kpc) = (1.9 +/- 0.3) x 10[SUP]11[/SUP] M[SUB]sun[/SUB], with an additional 10% error due to the uncertainty on the inclination of the galaxy. This, in combination with the analysis of the stellar populations indicates that the host galaxy of HE 1503+0228, is a normal spiral galaxy. Based on observations made with ANTU/UT1 at ESO-Paranal observatory in Chile (program 65.P-0361(A)), and with the ESO 3.5 m NTT, at La Silla observatory (program 62.P-0643(B)).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Courbin, F.;  Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août, 17 Sart Tilman (Bat. B5C), Liège 1, Belgium ; Universidad Católica de Chile, Departamento de Astronomia y Astrofisica, Casilla 306, Santiago 22, Chile
Letawe, Géraldine ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
Magain, Pierre  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Wisotzki, L.;  Institut für Physik, Universität Potsdam, Am Neuen Palais 10, 14469 Potsdam, Germany
Jablonka, P.;  GEPI, Observatoire de Paris, Place Jules Janssen, 92915 Meudon Cedex, France
Jahnke, K.;  Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
Kuhlbrodt, B.;  Hamburger Sternwarte, Universität Hamburg, Gojenbergsweg 112, 21029 Hamburg, Germany
Alloin, D.;  European Southern Observatory, Casilla 19, Santiago, Chile
Meylan, G.;  Space Telescope Science institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Minniti, D.;  Universidad Católica de Chile, Departamento de Astronomia y Astrofisica, Casilla 306, Santiago 22, Chile
Burud, I.;  Space Telescope Science institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
Language :
English
Title :
On-axis spatially resolved spectroscopy of low redshift quasar host galaxies: HE 1503+0228, at z=0.135
Publication date :
01 November 2002
Journal title :
Astronomy and Astrophysics
ISSN :
0004-6361
eISSN :
1432-0746
Publisher :
EDP Sciences, Les Ulis, France
Volume :
394
Pages :
863-872
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
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