scholarly journals Hubble Space Telescope observations of Baade's window

1993 ◽  
Vol 153 ◽  
pp. 289-290
Author(s):  
W. A. Baum ◽  
R. M. Light ◽  
J. Holtzman ◽  
D. Hunter ◽  
T. Kreidl ◽  
...  
Keyword(s):  
Stellar Population ◽  
Hubble Space Telescope ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Status Report ◽  
Wide Field ◽  
Galactic Bulge ◽  
Space Telescope ◽  
The Mean

This is a status report on a continuing program using the Hubble Space Telescope (HST) Wide–Field Camera (WFC) to probe the stellar population of the Galactic bulge to fainter magnitudes. We seek the mean age of the stars and the initial mass function (IMF). Galactic bulge stars offer the only opportunity to investigate the IMF of a super metal–rich population. They are 100 times closer than the next nearest sample.

scholarly journals New indications on the Galactic bulge IMF by microlensing surveys

2007 ◽  
Vol 3 (S245) ◽  
pp. 367-368
Author(s):  
L. Mancini ◽  
S. Calchi Novati
Keyword(s):  
Mass Spectrum ◽  
Stellar Population ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Galactic Bulge

AbstractBasing on recent microlensing observations, we analyse the mass spectrum of the Galactic bulge stellar population and study the slope of the initial mass function.

scholarly journals The stellar population and initial mass function of NGC 1399 with MUSE

2018 ◽  
Vol 479 (2) ◽  
pp. 2443-2456 ◽  
Author(s):  
Sam P Vaughan ◽  
Roger L Davies ◽  
Simon Zieleniewski ◽  
Ryan C W Houghton
Keyword(s):  
Stellar Population ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass

scholarly journals Hα and FUV luminosities from a stochastically formed stellar population

2011 ◽  
Vol 7 (S284) ◽  
pp. 53-55
Author(s):  
Nidia Lugo Lopez L. ◽  
Gladis Magris C. ◽  
Antonio Parravano
Keyword(s):  
Power Law ◽  
Surface Brightness ◽  
Stellar Population ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Low Surface Brightness ◽  
Low Surface Brightness Galaxies

AbstractIt has been observed that the ratio of Hα to FUV luminosity (LHα/LFUV) is lower in low surface brightness galaxies. This behaviour has been attributed to systematic variations of the upper mass end and/or the slope of the Initial Mass Function (IMF) Meurer et al. (2009) and Lee et al. (2009)). However these hypotheses do not explain the observed scatter in luminosity ratio (LHα/LFUV). We present a model for the total LHα and LFUV luminosity arising from a randomly populated IMF following the Salpeter power law and the clustering law of Oey & Clarke (2007).

scholarly journals The influence of star clusters on galactic disks: new insights in star-formation in galaxies

2008 ◽  
Vol 4 (S254) ◽  
pp. 209-220
Author(s):  
Pavel Kroupa
Keyword(s):  
Star Formation ◽  
Galaxy Evolution ◽  
Stellar Population ◽  
Dwarf Galaxy ◽  
Star Clusters ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Disk Galaxies ◽  
Galactic Disks

AbstractStars form in embedded star clusters which play a key role in determining the properties of a galaxy's stellar population. A large fraction of newly born massive stars are shot out from dynamically unstable embedded-cluster cores spreading them to large distances before they explode. Embedded clusters blow out their gas once the feedback energy from the new stellar population overcomes its binding energy, leading to cluster expansion and in many cases dissolution into the galaxy. Galactic disks may be thickened by such processes, and some thick disks may be the result of an early epoch of vigorous star-formation. Binary stellar systems are disrupted in clusters leading to a lower fraction of binaries in the field, while long-lived clusters harden degenerate-stellar binaries such that the SNIa rate may increase by orders of magnitude in those galaxies that were able to form long-lived clusters. The stellar initial mass function of the whole galaxy must be computed by adding the IMFs in the individual clusters. The resulting integrated galactic initial mass function (IGIMF) is top-light for SFRs < 10 M⊙/yr, and its slope and, more importantly, its upper stellar mass limit depend on the star-formation rate (SFR), explaining naturally the mass–metallicity relation of galaxies. Based on the IGIMF theory, the re-calibrated Hα-luminosity–SFR relation implies dwarf irregular galaxies to have the same gas-depletion time-scale as major disk galaxies, implying a major change of our concept of dwarf-galaxy evolution. A galaxy transforms about 0.3 per cent of its neutral gas mass every 10 Myr into stars. The IGIMF-theory also naturally leads to the observed radial Hα cutoff in disk galaxies without a radial star-formation cutoff. It emerges that the thorough understanding of the physics and distribution of star clusters may be leading to a major paradigm shift in our understanding of galaxy evolution.

scholarly journals Microlensing constraints on the Galactic bulge initial mass function

2007 ◽  
Vol 480 (3) ◽  
pp. 723-733 ◽  
Author(s):  
S. Calchi Novati ◽  
F. De Luca ◽  
Ph. Jetzer ◽  
L. Mancini ◽  
G. Scarpetta
Keyword(s):  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Galactic Bulge

scholarly journals The sub-solar initial mass function in the Large Magellanic Cloud

2008 ◽  
Vol 4 (S256) ◽  
pp. 250-255
Author(s):  
Dimitrios A. Gouliermis
Keyword(s):  
Star Formation ◽  
Hubble Space Telescope ◽  
Mass Function ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Star Forming ◽  
Advanced Camera For Surveys

AbstractThe Magellanic Clouds offer a unique variety of star forming regions seen as bright nebulae of ionized gas, related to bright young stellar associations. Nowadays, observations with the high resolving efficiency of the Hubble Space Telescope allow the detection of the faintest infant stars, and a more complete picture of clustered star formation in our dwarf neighbors has emerged. I present results from our studies of the Magellanic Clouds, with emphasis in the young low-mass pre-main sequence populations. Our data include imaging with the Advanced Camera for Surveys of the association LH 95 in the Large Magellanic Cloud, the deepest observations ever taken with HST of this galaxy. I discuss our findings in terms of the initial mass function, which we constructed with an unprecedented completeness down to the sub-solar regime, as the outcome of star formation in the low-metallicity environment of the LMC.

scholarly journals The Luminosity Function and Initial Mass Function in the Galactic Bulge

1998 ◽  
Vol 115 (5) ◽  
pp. 1946-1957 ◽  
Author(s):  
Jon A. Holtzman ◽  
Alan M. Watson ◽  
William A. Baum ◽  
Carl J. Grillmair ◽  
Edward J. Groth ◽  
...  
Keyword(s):  
Luminosity Function ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Galactic Bulge

scholarly journals CONNECTION BETWEEN DYNAMICALLY DERIVED INITIAL MASS FUNCTION NORMALIZATION AND STELLAR POPULATION PARAMETERS

2014 ◽  
Vol 792 (2) ◽  
pp. L37 ◽  
Author(s):  
Richard M. McDermid ◽  
Michele Cappellari ◽  
Katherine Alatalo ◽  
Estelle Bayet ◽  
Leo Blitz ◽  
...  
Keyword(s):  
Stellar Population ◽  
Mass Function ◽  
Initial Mass Function ◽  
Initial Mass ◽  
Population Parameters
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