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New Methods to Measure HII Regions Diameters

Published online by Cambridge University Press:  12 April 2016

O. Fuentes-Masip ,
H. O. Castañeda  and
C. Muñoz-Tuñón
O. Fuentes-Masip
Affiliation:
Instituto de Astrofísica de Canarias, 38200-La Laguna (Tenerife)SPAIN
H. O. Castañeda
Affiliation:
Instituto de Astrofísica de Canarias, 38200-La Laguna (Tenerife)SPAIN
C. Muñoz-Tuñón
Affiliation:
Instituto de Astrofísica de Canarias, 38200-La Laguna (Tenerife)SPAIN

Abstract

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Observations of the giant irregular galaxy NGC 4449 are being used to study the correlations between the diameter or luminosity and the velocity dispersion of its giant HII regions (GHRs), understanding as GHRs those HII regions with supersonic velocity dispersions. In the central part of this galaxy the HII regions overlap, and also there is a strong, morphologically diffuse emission that permeates the main body of NGC 4449, both effects making difficult the detection, identification and separation of HII regions. We have developed new techniques to solve these problems, obtaining HII regions parameters equivalent to the ones that would be got if the HII regions did not overlap and if the diffuse emission did not exist.

Type
2. The Fabry-Perot Spectrometer and its Applications
Information
International Astronomical Union Colloquium , Volume 149: Tridimensional Optical Spectroscopic Methods in Astrophysics , 1995 , pp. 143 - 147
Copyright
Copyright © Astronomical Society of the Pacific 1995

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