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A multifrequency study of star formation in the blue compact dwarf galaxy IZw 36Radio, near IR, optical, and UV observations of I Zw 36 = Mrk 209 = Haro 29 are reported. The H I distribution shows a core-halo structure, the core containing half of the mass and showing systematic motions; the halo is diffuse and contains several H I clumps. The visible star formation region is associated with the core but is shifted slightly with respect to the H I peak column density; and the virial mass is 5 to 7 times the H I mass. Star formation models with an initial mass function of slope 1.5 (the Salpeter value being 1.35) and a burst age or duration of a few million years fit well the optical spectrophotometric measurements. The data also suggest that the column density of molecular hydrogen in I Zw 36 is 6 + or - 3 times that of the neutral hydrogen, about the right amount to account for the virial mass.
Document ID
19830056092
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Viallefond, F.
(Paris, Observatoire, Meudon, Hauts-de-Seine, France; Groningen, Rijksuniversiteit Groningen, Netherlands)
Thuan, T. X.
(Observatoire de Paris-Meudon France)
Date Acquired
August 11, 2013
Publication Date
June 15, 1983
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 269
ISSN: 0004-637X
Subject Category
Astrophysics
Accession Number
83A37310
Distribution Limits
Public
Copyright
Other

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