1. RRI Digital Repository
  2. 04. Astronomy and Astrophysics
  3. Research Papers (A&A)
Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/4440
Full metadata record
DC FieldValueLanguage
dc.contributor.authorChiba, Masashi-
dc.contributor.authorNath, Biman B.-
dc.date.accessioned2012-05-07T08:38:45Z-
dc.date.available2012-05-07T08:38:45Z-
dc.date.issued1994-12-
dc.identifier.citationAstrophysical Journal, 1994, Vol. 436, p618en
dc.identifier.issn0004-6256-
dc.identifier.issn1538-3881(Online)-
dc.identifier.urihttp://hdl.handle.net/2289/4440-
dc.descriptionRestricted Access. An open-access version is available at arXiv.org (one of the alternative locations)en
dc.description.abstractWe investigate the effects of the observed UV background radiation on galaxy formation. Photoionization by UV radiation decreases the cooling rate of the gas in halos, so that objects with only large density contrasts can self-shield against the background radiation, thereby allowing the shielded neutral cores to cool and form stars. In the context of the cold dark matter (CDM) model, we use the criterion that self-shielding is essential for star formation to calculate the mass function of galaxies based on both Press-Schechter and the peaks formalisms. The ionizing UV radiation causes inhibition of galaxy formation-we show the decrease in the number density of the galaxies quantitatively. We also find that the merging in general is made inefficient by the UV photons through photoionization of the gas in the bigger system into which small objects are incorporated. The latter means that, in a merging-dominated region, where the number density at the low-mass end Mb less than or approximately = 1010 solar mass) is usually expected to decrease with time, the trend is reversed (the number of low-mass galaxies is greater at lower redshifts z) due to the increasing UV flux with time after z approximately 2. We further discuss the implication of our results for the number counts of galaxies and possible evolution of the luminosity function of the galaxies.en
dc.language.isoenen
dc.publisherAmerican Astronomical Societyen
dc.relation.urihttp://adsabs.harvard.edu/abs/1994ApJ...436..618Cen
dc.relation.urihttp://arxiv.org/abs/astro-ph/9406005en
dc.relation.urihttp://dx.doi.org/10.1086/174937en
dc.rights1994 The American Astronomical Societyen
dc.subjectbackground radiationen
dc.subjectgalactic evolutionen
dc.subjectphotoionizationen
dc.subjectradiation effectsen
dc.subjectultraviolet radiationen
dc.subjectdiffuse radiationen
dc.subjectuminosityen
dc.subjectradiative transferen
dc.titleEffects of photoionization on galaxy formationen
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

Files in This Item:
File Description SizeFormat 
1994_ApJ_V436_p618.pdf
  Restricted Access		Restricted Access237.8 kBAdobe PDFView/Open Request a copy
Show simple item record


Items in RRI Digital Repository are protected by copyright, with all rights reserved, unless otherwise indicated.