scholarly journals STELLAR POPULATIONS AND THE STAR FORMATION HISTORIES OF LOW SURFACE BRIGHTNESS GALAXIES. II. H II REGIONS

2013 ◽  
Vol 146 (2) ◽  
pp. 41 ◽  
Author(s):  
James Schombert ◽  
Stacy McGaugh ◽  
Tamela Maciel
Keyword(s):  
Star Formation ◽  
Surface Brightness ◽  
Stellar Populations ◽  
H Ii Regions ◽  
Low Surface Brightness ◽  
Star Formation Histories ◽  
Low Surface Brightness Galaxies

scholarly journals The star formation histories of Low Surface Brightness galaxies

1999 ◽  
Vol 171 ◽  
pp. 245-252
Author(s):  
E.F. Bell ◽  
R.G. Bower ◽  
R.S. de Jong ◽  
B.J. Rauscher ◽  
D. Barnaby ◽  
...  
Keyword(s):  
Star Formation ◽  
Surface Brightness ◽  
Near Infrared ◽  
Large Range ◽  
Optical Data ◽  
Disk Galaxies ◽  
Infrared Images ◽  
Low Surface Brightness ◽  
Star Formation Histories ◽  
Low Surface Brightness Galaxies

AbstractNear-infrared images of a sample of red, blue and giant low surface brightness disk galaxies (LSBGs) were combined with optical data with the aim of constraining their star formation histories. Most LSBGs have strong colour gradients consistent with mean stellar age gradients. We find that LSBGs have a large range of ages and metallicities, spanning those observed in normal disk galaxies. In particular, red and blue LSBGs have very different star formation histories and represent two independent routes to low B band surface brightness. Blue LSBGs are well described by models with low, roughly constant star formation rates, whereas red LSBGs are better described by a ‘faded disk’ scenario.

scholarly journals The star formation histories of low surface brightness galaxies

2000 ◽  
Vol 312 (3) ◽  
pp. 470-496 ◽  
Author(s):  
E. F. Bell ◽  
D. Barnaby ◽  
R. G. Bower ◽  
R. S. de Jong ◽  
D. A. Harper ◽  
...  
Keyword(s):  
Star Formation ◽  
Surface Brightness ◽  
Low Surface Brightness ◽  
Star Formation Histories ◽  
Low Surface Brightness Galaxies

scholarly journals Low Surface Brightness Galaxies Around the Hubble Deep Field South

2007 ◽  
Vol 3 (S244) ◽  
pp. 354-355 ◽  
Author(s):  
L. Haberzettl ◽  
D. J. Bomans ◽  
R.-J. Dettmar
Keyword(s):  
Star Formation ◽  
Surface Brightness ◽  
Stellar Population ◽  
Stellar Populations ◽  
Low Surface Brightness ◽  
Galaxy Redshift ◽  
Low Surface Brightness Galaxies ◽  
Hubble Deep Field ◽  
Lsb Galaxies ◽  
Selection Of

AbstractWe present results from a study of the SFH of a sample of LSB galaxies around the HDF-S. For the selection of the LSB galaxy candidates we used color–color diagrams, from which we selected the candidates based on their different location in comparison to the HSB galaxy redshift tracks. We compared measured spectra to synthetic SEDs from synthesis evolution models. We were able to fit SEDs in the range of 2 to 5 Gyr to the spectra of the LSB galaxies, while applying the same method to a sample of HSB galaxies resulted in an averaged stellar population of about 10 to 14 Gyr. Therefore, LSB galaxies tend to show much younger averaged stellar populations. This implies that the major star formation event of LSB galaxies took place at a redshift of z ~ 0.2 to 0.4 while for HSB galaxies this tends to be at z ~ 2 to 4.

scholarly journals Tidal Remnants and Intergalactic H II Regions

2004 ◽  
Vol 217 ◽  
pp. 486-491 ◽  
Author(s):  
Tom Oosterloo ◽  
Raffaella Morganti ◽  
Elaine M. Sadler ◽  
Annette Ferguson ◽  
Thijs van der Hulst ◽  
...  
Keyword(s):  
Star Formation ◽  
Surface Brightness ◽  
Small Scale ◽  
H Ii Regions ◽  
Tidal Disruption ◽  
Tidal Interactions ◽  
Sky Survey ◽  
Low Surface Brightness ◽  
Intergalactic Space ◽  
Star Formation Regions

We report the discovery of two small intergalactic H II regions in the loose group of galaxies around the field elliptical NGC 1490. The H II regions are located at least 100 kpc from any optical galaxy but are associated with a number of large H I clouds that are lying along an arc 500 kpc in length and that have no optical counterpart on the Digital Sky Survey. The sum of the H I masses of the clouds is almost 1010M⊙ and the largest H I cloud is about 100 kpc in size. Deep optical imaging reveals a very low surface brightness counterpart to this largest H I cloud, making this one of the H I richest optical galaxies known (MHI/LV ~ 200). Spectroscopy of the H II regions indicates that the abundance in these H II regions is only slightly sub-solar, excluding a primordial origin of the H I clouds. The H I clouds are perhaps remnants resulting from the tidal disruption of a reasonably sized galaxy, probably quite some time ago, by the loose group to which NGC 1490 belongs. Alternatively, they are remnants of the merger that created the field elliptical NGC 1490. The isolated H II regions show that star formation on a very small scale can occur in intergalactic space in gas drawn from galaxies by tidal interactions. Many such intergalactic small star formation regions may exist near tidally interacting galaxies.

scholarly journals Molecular Gas and Star-formation in Low Surface Brightness Galaxies

2017 ◽  
Vol 154 (3) ◽  
pp. 116 ◽  
Author(s):  
Tian-Wen Cao ◽  
Hong Wu ◽  
Wei Du ◽  
Feng-Jie Lei ◽  
Ming Zhu ◽  
...  
Keyword(s):  
Star Formation ◽  
Surface Brightness ◽  
Molecular Gas ◽  
Low Surface Brightness ◽  
Low Surface Brightness Galaxies

scholarly journals Radio Observations of AGN in Low Surface Brightness Galaxies

2007 ◽  
Vol 3 (S244) ◽  
pp. 352-353
Author(s):  
M. Das ◽  
S. S. McGaugh ◽  
N. Kantharia ◽  
S. N. Vogel
Keyword(s):  
Star Formation ◽  
Surface Brightness ◽  
Low Frequency ◽  
Radio Continuum ◽  
Continuum Emission ◽  
Preliminary Results ◽  
Low Surface Brightness ◽  
Low Surface Brightness Galaxies ◽  
Lsb Galaxies ◽  
Extended Emission

AbstractWe present preliminary results of a study of the low frequency radio continuum emission from the nuclei of Giant Low Surface Brightness (LSB) galaxies. We have mapped the emission and searched for extended features such as radio lobes/jets associated with AGN activity. LSB galaxies are poor in star formation and generally less evolved compared to nearby bright spirals. This paper presents low frequency observations of 3 galaxies; PGC 045080 at 1.4 GHz, 610 MHz, 325MHz, UGC 1922 at 610 MHz and UGC 6614 at 610 MHz. The observations were done with the GMRT. Radio cores as well as extended structures were detected and mapped in all three galaxies; the extended emission may be assocated with jets/lobes associated with AGN activity. Our results indicate that although these galaxies are optically dim, their nuclei can host AGN that are bright in the radio domain.

scholarly journals The star formation histories of red and blue low surface brightness disk galaxies

2010 ◽  
Vol 520 ◽  
pp. A69 ◽  
Author(s):  
G. H. Zhong ◽  
Y. C. Liang ◽  
F. Hammer ◽  
X. Y. Chen ◽  
L. C. Deng ◽  
...  
Keyword(s):  
Star Formation ◽  
Surface Brightness ◽  
Disk Galaxies ◽  
Low Surface Brightness ◽  
Star Formation Histories

scholarly journals Stellar Populations of Dwarf Galaxies

1995 ◽  
Vol 164 ◽  
pp. 430-431
Author(s):  
Elchanan Almoznino ◽  
Noah Brosch
Keyword(s):  
Surface Brightness ◽  
Dwarf Galaxies ◽  
High Surface ◽  
Stellar Populations ◽  
Virgo Cluster ◽  
Original Sample ◽  
High Surface Brightness ◽  
Brightness Level ◽  
Low Surface Brightness ◽  
Low Surface Brightness Galaxies

We selected a sample of dwarf galaxies in the Virgo cluster from the original catalog of Bingelli, Sandage and Tamman (1985), which have been measured at 21 cm by Hoffman et al. (1987). The original sample was selected to have both high surface brightness objects (classified as BCD or anything/BCD), and low surface brightness galaxies (classified as ImIII, ImIV or ImV). An additional selection was done on the total amount of HI, as given in Hoffman et al. We selected from each surface brightness group objects with high HI content (flux integral larger than a set threshold), and others with low HI content. We thus defined four samples differing in surface brightness level and total HI content.

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