scholarly journals The SLUGGS survey: globular cluster stellar population trends from weak absorption lines in stacked spectra

2014 ◽  
Vol 446 (1) ◽  
pp. 369-390 ◽  
Author(s):  
Christopher Usher ◽  
Duncan A. Forbes ◽  
Jean P. Brodie ◽  
Aaron J. Romanowsky ◽  
Jay Strader ◽  
...  
Keyword(s):  
Globular Cluster ◽  
Stellar Population ◽  
Population Trends ◽  
Absorption Lines ◽  
Weak Absorption

scholarly journals VLT Observations of the Peculiar Globular Cluster NGC 6712. III. The Evolved Stellar Population

2001 ◽  
Vol 121 (6) ◽  
pp. 3114-3126 ◽  
Author(s):  
Barbara Paltrinieri ◽  
Francesco R. Ferraro ◽  
Francesco Paresce ◽  
Guido De Marchi
Keyword(s):  
Globular Cluster ◽  
Stellar Population

scholarly journals Extragalactic GCs in the near-infrared: genuinely old in E/S0's?

2009 ◽  
Vol 5 (S262) ◽  
pp. 315-316
Author(s):  
Ana L. Chies-Santos ◽  
Søren S. Larsen
Keyword(s):  
Globular Cluster ◽  
Stellar Population ◽  
Near Infrared ◽  
Local Group ◽  
Stellar Populations ◽  
Age Dating ◽  
Early Type ◽  
Optical Photometry ◽  
Star Forming ◽  
Optical Images

Globular cluster (GC) systems are powerful probes to study the evolutionary histories of galaxies, being tracers of major star fomation episodes (Brodie & Strader 2006). They are found around all major galaxies and are easy to see far beyond the local group. Age dating GCs therefore helps pinpoint epochs of major star forming events. Spectroscopic age dating though (Strader et al. 2005) is extremely time consuming and can only access the few brightest clusters. An alternative is to combine near-infrared (NIR) and optical photometry, and therefore have a better chance in lifting the age metallicity degeneracy than with optical colours alone. This approach relies in testing GC colours against simple stellar population (SSP) models. The first studies following this technique showed the possible existence of a high percentage of intermediate age (2-3 Gyrs) GCs in early-type galaxies known to contain old stellar populations from integrated light studies. Two strong cases can be listed: NGC 4365 (Puzia et al. 2002, Larsen et al. 2005) and NGC 5846 (Hempel et al. 2003). In the present study we combine NIR deep photometry obtained with the WHT/LIRIS instrument and archival HST/ACS optical images to determine g(F475W), z(F840LP) and K(2.2m) magnitudes and colours of GCs in 14 early-type galaxies.

scholarly journals Stellar population trends in S0 galaxies

2010 ◽  
Vol 412 (1) ◽  
pp. 423-447 ◽  
Author(s):  
L. C. Prochaska Chamberlain ◽  
Stéphane Courteau ◽  
Michael McDonald ◽  
James A. Rose
Keyword(s):  
Stellar Population ◽  
Population Trends ◽  
S0 Galaxies

scholarly journals Determination of the OB Stellar Population of IZw18 on the Basis of its Hγ and Hδ Absorption lines

1999 ◽  
Vol 194 ◽  
pp. 444-447
Author(s):  
A. Sinanyan ◽  
D. Kunth ◽  
J. Lequeux ◽  
G. Comte ◽  
A. Petrosian
Keyword(s):  
Spectral Range ◽  
Stellar Population ◽  
Dwarf Galaxy ◽  
Absorption Lines ◽  
Spectroscopic Observations ◽  
Narrow Spectral Range ◽  
Blue Compact Dwarf Galaxy

On the basis of new spectroscopic observations of the blue compact dwarf galaxy IZw18 in the narrow spectral range between 4000Å and 4500Å absorption components of Hγ and Hδ lines were discovered. Equivalent widths of Hγ and Hδ lines have been measured. From available data the OB population of IZw18 was analyzed.

GALACTIC GLOBULAR CLUSTER NGC 6752 AND ITS STELLAR POPULATION AS INFERRED FROM MULTICOLOR PHOTOMETRY

2014 ◽  
Vol 783 (1) ◽  
pp. 56 ◽  
Author(s):  
Valery Kravtsov ◽  
Gonzalo Alcaíno ◽  
Gianni Marconi ◽  
Franklin Alvarado
Keyword(s):  
Globular Cluster ◽  
Stellar Population ◽  
Multicolor Photometry

scholarly journals Kinematics of the LMC CH-stars

1991 ◽  
Vol 148 ◽  
pp. 77-80 ◽  
Author(s):  
F.D.A. Hartwick ◽  
A. P. Cowley
Keyword(s):  
Globular Cluster ◽  
Stellar Population ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud

Velocities have been measured for 74 CH stars in the direction of the Large Magellanic Cloud (LMC). These have been used to study the kinematics of the oldest stellar population. Velocities of these objects appear to reflect two distinct subgroups - one associated with the old globular cluster population and a second with the LMC disk.

scholarly journals A Study of the Continua of the Nuclei of Galaxies

1972 ◽  
Vol 44 ◽  
pp. 188-189
Author(s):  
D. Alloin ◽  
Y. Andrillat ◽  
S. Souffrin
Keyword(s):  
Continuous Spectrum ◽  
Stellar Population ◽  
Absorption Lines ◽  
Ngc 1068 ◽  
Instrumental Effect

Many people have attacked the problem of synthesizing the stellar population of the galaxies. We have performed such a synthesis, by using only the intensities of absorption lines in the nuclei of galaxies. It is then possible to obtain a synthesized continuous spectrum even if there are several possible solutions for the stellar composition, and the computed continuum does not vary much with the assumed model of stellar population.The method is to fit the equivalent widths of the absorption lines using different stellar compositions. In order to avoid any instrumental effect, we have observed different lines and bands from 3500 to 8500 å in stars of various well-known stellar types and luminosity classes, under the same conditions as the galaxies.We have applied this method to some ‘ordinary’ nuclei and to some Seyfert ones. As an example, we show the results for M81 and for NGC 1068.

scholarly journals A study of stellar population of intermediate-age globular cluster NGC 2249

2020 ◽  
Vol 17 ◽  
pp. 103144 ◽  
Author(s):  
Zhongmu Li ◽  
Rainer Spurzem ◽  
Caiyan Mao ◽  
Yingxin Ma ◽  
Yangyang Deng
Keyword(s):  
Globular Cluster ◽  
Stellar Population
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