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Title: H-alpha images of early type galaxies with hot gas

Abstract

H-alpha imaging observations of 13 early type galaxies with known X-ray fluxes are presented from the Einstein Observatory data, and long-slit spectroscopy of nine of these. H-alpha emission is detected in the central regions of ten objects. The line emission appears extended over a radius of 5-10 kpc, is generally peaked on the nucleus with regular elliptical isophotes, similar to the red continuum, although with a steeper radial distribution. Low surface brightness filamentary structure is also seen in a few cases (NGC 4406 and NGC 5846). To study the different phases of the interstellar medium in early type galaxies, the emissions due to hot (X-ray) and warm (H-alpha) gas are compared. On average, galaxies with a larger content of hot gas also show a more powerful line emission. However, the scatter in the relation is significant, and suggests that other parameters must play a role. The depth of the gravitational potential and/or the shape of the objects are probably important in determining the amount of gas present in early type galaxies. 50 refs.

Authors:
;  [1]
  1. Arcetri, Osservatorio Astronomico, Florence (Italy) European Southern Observatory, Garching (Federal Republic of Germany)
Publication Date:
OSTI Identifier:
5503405
Resource Type:
Journal Article
Journal Name:
Astronomical Journal; (United States)
Additional Journal Information:
Journal Volume: 101; Journal ID: ISSN 0004-6256
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; GALAXIES; BALMER LINES; COSMIC GASES; COMPARATIVE EVALUATIONS; GALACTIC EVOLUTION; GALAXY NUCLEI; INTERSTELLAR SPACE; IONIZED GASES; MORPHOLOGY; SPECTROSCOPY; X-RAY SPECTRA; FLUIDS; GASES; SPACE; SPECTRA; 640105* - Astrophysics & Cosmology- Galaxies

Citation Formats

Trinchieri, G, and Di serego alighieri, S. H-alpha images of early type galaxies with hot gas. United States: N. p., 1991. Web. doi:10.1086/115794.
Trinchieri, G, & Di serego alighieri, S. H-alpha images of early type galaxies with hot gas. United States. https://doi.org/10.1086/115794
Trinchieri, G, and Di serego alighieri, S. 1991. "H-alpha images of early type galaxies with hot gas". United States. https://doi.org/10.1086/115794.
@article{osti_5503405,
title = {H-alpha images of early type galaxies with hot gas},
author = {Trinchieri, G and Di serego alighieri, S},
abstractNote = {H-alpha imaging observations of 13 early type galaxies with known X-ray fluxes are presented from the Einstein Observatory data, and long-slit spectroscopy of nine of these. H-alpha emission is detected in the central regions of ten objects. The line emission appears extended over a radius of 5-10 kpc, is generally peaked on the nucleus with regular elliptical isophotes, similar to the red continuum, although with a steeper radial distribution. Low surface brightness filamentary structure is also seen in a few cases (NGC 4406 and NGC 5846). To study the different phases of the interstellar medium in early type galaxies, the emissions due to hot (X-ray) and warm (H-alpha) gas are compared. On average, galaxies with a larger content of hot gas also show a more powerful line emission. However, the scatter in the relation is significant, and suggests that other parameters must play a role. The depth of the gravitational potential and/or the shape of the objects are probably important in determining the amount of gas present in early type galaxies. 50 refs.},
doi = {10.1086/115794},
url = {https://www.osti.gov/biblio/5503405}, journal = {Astronomical Journal; (United States)},
issn = {0004-6256},
number = ,
volume = 101,
place = {United States},
year = {Wed May 01 00:00:00 EDT 1991},
month = {Wed May 01 00:00:00 EDT 1991}
}