The dependence of H ii region properties on global and local surface brightness within galaxy discs
dc.contributor.author | Helmboldt, J. F. | en_US |
dc.contributor.author | Walterbos, R. A. M. | en_US |
dc.contributor.author | Bothun, G. D. | en_US |
dc.contributor.author | O'Neil, K. | en_US |
dc.contributor.author | Oey, M. S. | en_US |
dc.date.accessioned | 2010-06-01T22:16:02Z | |
dc.date.available | 2010-06-01T22:16:02Z | |
dc.date.issued | 2009-02-21 | en_US |
dc.identifier.citation | Helmboldt, J. F.; Walterbos, R. A. M.; Bothun, G. D.; O'Neil, K.; Oey, M. S. (2009). "The dependence of H ii region properties on global and local surface brightness within galaxy discs." Monthly Notices of the Royal Astronomical Society 393(2): 478-490. <http://hdl.handle.net/2027.42/75281> | en_US |
dc.identifier.issn | 0035-8711 | en_US |
dc.identifier.issn | 1365-2966 | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/75281 | |
dc.description.abstract | Using B , R and HΑ images of roughly equal-sized samples of low surface brightness (LSB) and high surface brightness (HSB) galaxies (∼40 galaxies apiece), we have explored the dependence of H ii region properties on local and global disc surface brightness. We have done this by constructing co-added H ii region luminosity functions (LFs) according to local and central disc surface brightness and fitting Schechter functions to these LFs. The results show that the shape of the H ii region LF within LSB galaxies does not change noticeably as different limiting (i.e. Μ > Μ lim ) local surface brightness values are used. However, the LFs for HSB galaxies have larger values of L * and are less steep at the faint-end than those of LSB galaxies for limiting B -band local surface brightness values as faint as Μ B ,lim ≃ 23– 24 . Both the LFs and the data for individual H ii regions show that luminous ( L > 10 39 erg s −1 ) H ii regions are much more common within HSB discs than within LSB discs, implying that the newly formed star clusters are also larger. Taking this into account along with the results of Monte Carlo simulations, the shapes of the LFs imply that the regions within LSB discs and those within the LSB areas of HSB discs are relatively old (∼5 Myr) while the regions within HSB discs for Μ B ≲ 24 are significantly younger (<1 Myr). Since the majority of the LSB galaxies do not have noticeable spiral arms and the majority of the HSB galaxies do, this may indicate a transition within HSB discs from spiral arm-driven star formation to a more locally driven, possibly sporadic form of star formation at Μ B ∼ 24 , a transition that does not appear to occur within LSB discs. | en_US |
dc.format.extent | 3452403 bytes | |
dc.format.extent | 3109 bytes | |
dc.format.mimetype | application/pdf | |
dc.format.mimetype | text/plain | |
dc.publisher | Blackwell Publishing Ltd | en_US |
dc.rights | Journal compilation © 2009 RAS | en_US |
dc.subject.other | Galaxies: ISM | en_US |
dc.subject.other | Galaxies: Photometry | en_US |
dc.subject.other | Galaxies: Star Clusters | en_US |
dc.title | The dependence of H ii region properties on global and local surface brightness within galaxy discs | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Astronomy | en_US |
dc.subject.hlbtoplevel | Science | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationum | Astronomy Department, University of Michigan, 830 Dennison Building, Ann Arbor, MI 48109-1042, USA | en_US |
dc.contributor.affiliationother | Naval Research Laboratory, Code 7213, 4555 Overlook Avenue SW, Washington, DC 20375-5351, USA | en_US |
dc.contributor.affiliationother | Department of Astronomy, New Mexico State University, MSC 4500 PO Box 30001 Las Cruces, NM 88003, USA | en_US |
dc.contributor.affiliationother | Physics Department, University of Oregon, 1371 East 13th Avenue, Eugene, OR 97403, USA | en_US |
dc.contributor.affiliationother | National Radio Astronomy Observatory, PO Box 2, Green Bank, WV 24944, USA | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/75281/1/j.1365-2966.2008.14062.x.pdf | |
dc.identifier.doi | 10.1111/j.1365-2966.2008.14062.x | en_US |
dc.identifier.source | Monthly Notices of the Royal Astronomical Society | en_US |
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dc.owningcollname | Interdisciplinary and Peer-Reviewed |
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