On the shape of luminosity profiles of dwarf galaxies as a distance indicator: the NGC 5044 Group revisited

Conflicting evidence has been recently raised in order to use surface brightness profiles of dwarf galaxies as a distance indicator. In this paper we discuss in some detail the main error sources in profile fitting procedures for galaxies with more than one physical component, showing their impact o...

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Detalles Bibliográficos
Autores principales: Cellone, Sergio Aldo, Buzzoni, Alberto
Formato: Articulo
Lenguaje:Inglés
Publicado: 2001
Materias:
Ciencias Astronómicas
galaxies: clusters: NGC 5044 Group; galaxies: distances and redshifts, elliptical and lenticular, fundamental parameters, photometry, structure
galaxias
estrellas
astrofísica
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/2067
http://www.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aa/full/2001/15/aah2021/aah2021.html
http://www.aanda.org/articles/aa/pdf/2001/15/aah2021.pdf
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-2067
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
galaxies: clusters: NGC 5044 Group; galaxies: distances and redshifts, elliptical and lenticular, fundamental parameters, photometry, structure
galaxias
estrellas
astrofísica
spellingShingle Ciencias Astronómicas
galaxies: clusters: NGC 5044 Group; galaxies: distances and redshifts, elliptical and lenticular, fundamental parameters, photometry, structure
galaxias
estrellas
astrofísica
Cellone, Sergio Aldo
Buzzoni, Alberto
On the shape of luminosity profiles of dwarf galaxies as a distance indicator: the NGC 5044 Group revisited
topic_facet Ciencias Astronómicas
galaxies: clusters: NGC 5044 Group; galaxies: distances and redshifts, elliptical and lenticular, fundamental parameters, photometry, structure
galaxias
estrellas
astrofísica
description Conflicting evidence has been recently raised in order to use surface brightness profiles of dwarf galaxies as a distance indicator. In this paper we discuss in some detail the main error sources in profile fitting procedures for galaxies with more than one physical component, showing their impact on the resulting shape parameters. The apparent tight coupling between shape parameter and (pseudo) scalelength in the Sérsic law is especially dealt with, demonstrating that this relationship is mostly a mathematical artifact, thus throwing doubts on its usefulness as a distance indicator. Galaxies departing from the luminosity-shape relation are shown to exhibit different kinds of intrinsic peculiarities, thus prompting for better securing the empirical constraints to conform observational samples. As a relevant example in this sense, new observations of the galaxy N50 in the NGC 5044 Group are presented. We show that this object may be at an intermediate evolutionary stage between blue compact dwarfs (BCDs) and dwarf ellipticals (dEs).
format Articulo
Articulo
author Cellone, Sergio Aldo
Buzzoni, Alberto
author_facet Cellone, Sergio Aldo
Buzzoni, Alberto
author_sort Cellone, Sergio Aldo
title On the shape of luminosity profiles of dwarf galaxies as a distance indicator: the NGC 5044 Group revisited
title_short On the shape of luminosity profiles of dwarf galaxies as a distance indicator: the NGC 5044 Group revisited
title_full On the shape of luminosity profiles of dwarf galaxies as a distance indicator: the NGC 5044 Group revisited
title_fullStr On the shape of luminosity profiles of dwarf galaxies as a distance indicator: the NGC 5044 Group revisited
title_full_unstemmed On the shape of luminosity profiles of dwarf galaxies as a distance indicator: the NGC 5044 Group revisited
title_sort on the shape of luminosity profiles of dwarf galaxies as a distance indicator: the ngc 5044 group revisited
publishDate 2001
url http://sedici.unlp.edu.ar/handle/10915/2067
http://www.aanda.org/index.php?option=com_article&access=standard&Itemid=129&url=/articles/aa/full/2001/15/aah2021/aah2021.html
http://www.aanda.org/articles/aa/pdf/2001/15/aah2021.pdf
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AT buzzonialberto ontheshapeofluminosityprofilesofdwarfgalaxiesasadistanceindicatorthengc5044grouprevisited
bdutipo_str Repositorios
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