NDLI: The Hα Emission of the Spiral Galaxy NGC 7479

Content Provider	Springer Nature Link
Author	Zurita, A. Rozas, M. Beckman, J.E.
Copyright Year	2001
Abstract	We use the catalogue of HII regions obtained from a high quality continuum-subtracted Hα image of the grand-design spiral galaxy NGC 7479, to construct the luminosity function (LF) for the HII regions(over 1000) of the whole galaxy. Although its slope is within the published range for spirals of the same morphological type, the unusually strong star formation along the intense bar of NGC 7479 prompted us to analyse separately the HII regions in the bar and in the disc. We have calculated the physical properties of a group of HII regions in the bar and in the disc selected for their regular shapes and absence of blending. We have obtained galaxy-wide relations for the HII region set: diameter distribution function and also the global Hα surface density distribution. As found previously for late-type spirals, the disc LF shows clear double-linear behaviour with a break at log L $${\text{H}}_\alpha$$ ∼ 38.6 (in erg -1). The bar LF is less regular. This reflects a physical difference between the bar and the disc in the properties of their populations of regions.
Starting Page	491
Ending Page	498
Page Count	8
File Format	PDF
ISSN	0004640X
Journal	Astrophysics and Space Science
Volume Number	276
Issue Number	2-4
e-ISSN	1572946X
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2001-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astronomy
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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