CCD observations of gas and dust in NGC 4696

Continuum and emission-line direct CCD observations of the gas and dust in NGC4696 are presented and discussed. We derive the wavelength dependence of extinction and show that it is normal. The line luminosities are derived and evidence that the gas and dust are well-mixed is presented. The data are...

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Detalles Bibliográficos
Autores principales: Sparks, W.B., Machetto, F.
Formato: Articulo Comunicacion
Lenguaje:Español
Publicado: 1988
Materias:
Astronomía
Galaxia
ngc 4696
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/141995
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-141995
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Español
topic Astronomía
Galaxia
ngc 4696
spellingShingle Astronomía
Galaxia
ngc 4696
Sparks, W.B.
Machetto, F.
CCD observations of gas and dust in NGC 4696
topic_facet Astronomía
Galaxia
ngc 4696
description Continuum and emission-line direct CCD observations of the gas and dust in NGC4696 are presented and discussed. We derive the wavelength dependence of extinction and show that it is normal. The line luminosities are derived and evidence that the gas and dust are well-mixed is presented. The data are used to constrain physical conditions within the dust lane. An external (infall) origin for the dust-lane material is favoured from the observations. We discuss the interaction between cool infalling gas and the hot X-ray gas. Heat transfer from the X-ray gas to the dust lane can be energetically significant, and indeed ie calculated to be of the same order of magnitude as the total emitted radiation of the dust lane. We therefore suggest heat transfer might provide the excitation for both the optical emission lines and infra-red radiation. If infall is generally responsible for optical line-emission system, then: (i) the correlation between optical emission and X-ray may not be due to the presence of unstable, cooling filament (ii) cooling of the hot halo by the dust lane may produce cooler X-ray gas (iii) the structure of some thermal conduction models would be altered by the imposition of an inner cold boundary condition. This paper will appear in the October issue of the Astrophysical Journal.
format Articulo
Comunicacion
author Sparks, W.B.
Machetto, F.
author_facet Sparks, W.B.
Machetto, F.
author_sort Sparks, W.B.
title CCD observations of gas and dust in NGC 4696
title_short CCD observations of gas and dust in NGC 4696
title_full CCD observations of gas and dust in NGC 4696
title_fullStr CCD observations of gas and dust in NGC 4696
title_full_unstemmed CCD observations of gas and dust in NGC 4696
title_sort ccd observations of gas and dust in ngc 4696
publishDate 1988
url http://sedici.unlp.edu.ar/handle/10915/141995
work_keys_str_mv AT sparkswb ccdobservationsofgasanddustinngc4696
AT machettof ccdobservationsofgasanddustinngc4696
bdutipo_str Repositorios
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