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Study of quasar host galaxies combining HST/ACS images and VLT Spectroscopy
Letawe, Yannick; Letawe, Géraldine; Magain, Pierre
2010In Macchetto, F. D. (Ed.) The Impact of HST on European Astronomy
 

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Keywords :
Quasar; HST; Spectroscopy
Abstract :
[en] We present the results of a study of the host galaxies of a few bright low redshift quasars, based on a combination of high resolution HST/ACS images with deep VLT spectra. Using a version of the MCS deconvolution algorithm specially adapted to HST images, the light from the central point source can be efficiently removed, which allows to study the environment of the quasar down to a few hundreds of parsecs from the center. In a similar way, the spectra can be separated into a quasar contribution and a spatialy resolved slit spectrum of the host galaxy. Combinig the images and spectra allows to carry out a detailed analysis of the immediate environment of the quasar: excitation and ionisation state of the gas, dynamics... Up to now, this method has been applied to six quasars, including the peculiar HE0450-2958 for which no host galaxy could be detected.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Letawe, Yannick
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
Language :
English
Title :
Study of quasar host galaxies combining HST/ACS images and VLT Spectroscopy
Publication date :
22 March 2010
Event name :
The impact of HST on european astronomy, 41st ESLAB symposium
Event organizer :
ESA
Event place :
Noordwijk, Netherlands
Event date :
29 mai au 1 juin 2007
Audience :
International
Main work title :
The Impact of HST on European Astronomy
Editor :
Macchetto, F. D.
Publisher :
Springer
ISBN/EAN :
978-90-481-3399-4
Collection name :
Astrophysics and Space Science Proceedings
Pages :
197-201
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