scholarly journals The Stellar Content and Star Formation History of the Late-Type Spiral Galaxy NGC 300 fromHubble Space TelescopeObservations

2004 ◽  
Vol 127 (3) ◽  
pp. 1472-1485 ◽  
Author(s):  
D. J. Butler ◽  
D. Martnez-Delgado ◽  
W. Brandner
Keyword(s):  
Star Formation ◽  
Spiral Galaxy ◽  
Star Formation History ◽  
Stellar Content ◽  
Late Type ◽  
Formation History ◽  
History Of

scholarly journals The star formation history of the Fornax dwarf spheroidal galaxy

2009 ◽  
Vol 5 (S262) ◽  
pp. 353-354
Author(s):  
Enrico V. Held ◽  
Eline Tolstoy ◽  
Luca Rizzi ◽  
Mary Cesetti ◽  
Andrew A. Cole ◽  
...  
Keyword(s):  
Star Formation ◽  
Galaxy Evolution ◽  
Stellar Population ◽  
Main Sequence ◽  
Dwarf Galaxy ◽  
Star Formation History ◽  
Stellar Content ◽  
Formation History ◽  
First Results ◽  
History Of

AbstractWe present the first results of a comprehensive HST study of the star-formation history of Fornax dSph, based on WFPC2 imaging of 7 Fornax fields. Our observations reach the oldest main-sequence turnoffs, allowing us to address fundamental questions of dwarf galaxy evolution, such as the spatial variations in the stellar content, and whether the old stellar population is made up of stars formed in a very early burst or the result of a more continuous star formation.

scholarly journals Near-infrared spectroscopy of the massive stellar population of W51: evidence for multi-seeded star formation

2019 ◽  
Vol 624 ◽  
pp. A63 ◽  
Author(s):  
A. Bik ◽  
Th. Henning ◽  
S.-W. Wu ◽  
M. Zhang ◽  
W. Brandner ◽  
...  
Keyword(s):  
Star Formation ◽  
Near Infrared ◽  
Infrared Imaging ◽  
Massive Stars ◽  
Star Formation History ◽  
Giant Molecular Clouds ◽  
Stellar Content ◽  
Cloud Properties ◽  
Formation History ◽  
History Of

Context. The interplay between the formation of stars, stellar feedback and cloud properties strongly influences the star formation history of giant molecular clouds. The formation of massive stars leads to a variety of stellar clusters, ranging from low stellar density OB associations to dense, gravitationally bound starburst clusters. Aims. We aimed at identifying the massive stellar content and reconstructing the star formation history of the W51 giant molecular cloud. Methods. We performed near-infrared imaging and K-band spectroscopy of the massive stars in W51. We analysed the stellar populations using colour-magnitude and colour-colour diagrams and compared the properties of the spectroscopically identified stars with stellar evolution models. Results. We derive the ages of the different sub-clusters in W51 and, based on our spectroscopy derive an age for W51 of 3 Myr or less. The age of the P Cygni star LS1 and the presence of two still forming proto-clusters suggests that the star formation history of W51 is more complex than a single burst. Conclusions. We did not find evidence for triggered star formation and we concluded that the star formation in W51 is multi seeded. We finally concluded that W51 is an OB association where different sub-clusters form over a time span of at least 3–5 Myr.

scholarly journals Tracing the Mass‐Dependent Star Formation History of Late‐Type Galaxies Using X‐Ray Emission: Results from the Chandra Deep Fields

2008 ◽  
Vol 681 (2) ◽  
pp. 1163-1182 ◽  
Author(s):  
B. D. Lehmer ◽  
W. N. Brandt ◽  
D. M. Alexander ◽  
E. F. Bell ◽  
A. E. Hornschemeier ◽  
...  
Keyword(s):  
Star Formation ◽  
Star Formation History ◽  
Late Type ◽  
X Ray ◽  
Formation History ◽  
History Of ◽  
Deep Fields ◽  
Mass Dependent

scholarly journals Statistics and properties of emission-line regions in the local volume dwarf galaxies

2020 ◽  
Vol 495 (4) ◽  
pp. 3592-3601
Author(s):  
I D Karachentsev ◽  
S S Kaisin
Keyword(s):  
Star Formation ◽  
Emission Line ◽  
Supernova Remnants ◽  
Dwarf Galaxies ◽  
Star Formation History ◽  
H Ii Regions ◽  
Late Type ◽  
Formation History ◽  
History Of ◽  
Hydrogen Mass

ABSTRACT We used the H α images  from a large sample of nearby late-type dwarf galaxies to investigate properties of their emission structure. The sample consists of 300 galaxies of the irregular (Irr), Magellanic irregular (Im), blue compact dwarf (BCD), and transition (Tr) types situated within a distance of 11 Mpc. In each galaxy, we indicated the number of compact H ii regions, the presence of bubble-like or filament-like structures, the presence of a faint diffuse emission, and a sign of the global burst. The larger the luminosity of a galaxy, the greater number of compact H ii sources in it. The integral and specific star formation rates (SFRs) of the dwarf increase steeply with the increase of the number of H ii regions showing the evidence of the epidemic character of the star formation process. The dwarf galaxies with emission-line bubbles, or filaments, or signs of the global star formation burst have approximately the same hydrogen-mass-to-luminosity ratio as that of the whole sample objects. However, their mean SFR is significantly higher than that of other galaxies in the sample. Emission bubble-like structures are found in the nearby dwarfs with a frequency of one case per four to five galaxies. Their linear diameters are close to those expected for supernova remnants. The mean specific SFR for the nearby late-type dwarfs is close to the Hubble parameter, H0 = −10.14 dex (yr)−1, consistent with the sluggish cosmic star formation history of galaxies of this kind.

scholarly journals Stellar Content and Recent Star Formation History of the Local Group Dwarf Irregular Galaxy IC 1613

2007 ◽  
Vol 134 (3) ◽  
pp. 1124-1132 ◽  
Author(s):  
Edouard J. Bernard ◽  
Antonio Aparicio ◽  
Carme Gallart ◽  
Carmen P. Padilla-Torres ◽  
Maurizio Panniello
Keyword(s):  
Star Formation ◽  
Local Group ◽  
Star Formation History ◽  
Stellar Content ◽  
Irregular Galaxy ◽  
Formation History ◽  
History Of

The Star Formation History of the Local Group Dwarf Galaxy Leo I

1999 ◽  
Vol 118 (5) ◽  
pp. 2245-2261 ◽  
Author(s):  
Carme Gallart ◽  
Wendy L. Freedman ◽  
Antonio Aparicio ◽  
Giampaolo Bertelli ◽  
Cesare Chiosi
Keyword(s):  
Star Formation ◽  
Local Group ◽  
Dwarf Galaxy ◽  
Star Formation History ◽  
Formation History ◽  
History Of
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