scholarly journals Measuring Star Formation Histories, Distances, and Metallicities with Pixel Color–Magnitude Diagrams. II. Applications to Nearby Elliptical Galaxies

2020 ◽  
Vol 893 (2) ◽  
pp. 160
Author(s):  
B. A. Cook ◽  
Charlie Conroy ◽  
Pieter van Dokkum
Keyword(s):  
Star Formation ◽  
Elliptical Galaxies ◽  
Pixel Color ◽  
Star Formation Histories

scholarly journals The star formation histories of elliptical galaxies across the Fundamental Plane

2007 ◽  
Vol 375 (1) ◽  
pp. 371-380 ◽  
Author(s):  
L. A. Nolan ◽  
J. S. Dunlop ◽  
B. Panter ◽  
R. Jimenez ◽  
A. Heavens ◽  
...  
Keyword(s):  
Star Formation ◽  
Elliptical Galaxies ◽  
Fundamental Plane ◽  
Star Formation Histories

scholarly journals The history of the Galactic bulge

2016 ◽  
Vol 12 (S323) ◽  
pp. 184-187 ◽  
Author(s):  
A. A. Zijlstra ◽  
K. Gesicki ◽  
M. M. Miller Bertolami
Keyword(s):  
Star Formation ◽  
Planetary Nebulae ◽  
Elliptical Galaxies ◽  
Recent Analysis ◽  
Galactic Bulge ◽  
Luminosity Functions ◽  
New Models ◽  
Show Evidence ◽  
History Of ◽  
Star Formation Histories

AbstractPlanetary nebulae form in stellar populations with ages from 1 to 10 Gyr, and can be used to trace their star formation histories. Here we apply this to the Galactic bulge, where there are indications both for an old origin and for younger stars. We use new stellar models, which have significant different evolutionary speeds during the post-AGB phase. We apply these new models to a sample of 32 planetary nebulae with HST imaging and VLT spectroscopy. The results show evidence for an old starburst, followed by continuous star formation until at least 2Gyr ago. This agrees very well with recent analysis of colour-magnitude diagrams of the bulge. We show that the new models can also explain the [OIII] luminosity functions, and predict the uniform luminosity cut-off both in spiral galaxies and old elliptical galaxies.

scholarly journals Evolution of the Ultraviolet Upturn at 0.3 < z < 1: Exploring Helium-rich Stellar Populations

2021 ◽  
Vol 923 (1) ◽  
pp. 12
Author(s):  
Sadman S. Ali ◽  
Roberto De Propris ◽  
Chul Chung ◽  
Steven Phillipps ◽  
Malcolm N. Bremer
Keyword(s):  
Star Formation ◽  
Globular Clusters ◽  
Rest Frame ◽  
Stellar Populations ◽  
Elliptical Galaxies ◽  
Early Type ◽  
Similar Chemical ◽  
Far Ultraviolet ◽  
Star Formation Histories ◽  
Optical Color

Abstract We measure the near-UV (rest-frame ∼2400 Å) to optical color for early-type galaxies in 12 clusters at 0.3 < z < 1.0. We show that this is a suitable proxy for the more common far-ultraviolet bandpass used to measure the ultraviolet upturn and find that the upturn is detected to z = 0.6 in these data, in agreement with previous work. We find evidence that the strength of the upturn starts to wane beyond this redshift and largely disappears at z = 1. Our data are most consistent with models where early-type galaxies contain minority stellar populations with non-cosmological helium abundances, up to around 46%, formed at z ≥ 3, resembling globular clusters with multiple stellar populations in our Galaxy. This suggests that elliptical galaxies and globular clusters share similar chemical evolution and star formation histories. The vast majority of the stellar mass in these galaxies also must have been in place at z > 3.

scholarly journals Abundance Ratios in Dwarf Elliptical Galaxies

2016 ◽  
Vol 11 (S321) ◽  
pp. 269-269
Author(s):  
Seyda Sen ◽  
Reynier F. Peletier ◽  
Elisa Toloba ◽  
Jaco J. Mentz
Keyword(s):  
Star Formation ◽  
Stellar Population ◽  
Population Analysis ◽  
Elliptical Galaxies ◽  
Virgo Cluster ◽  
Scaling Relations ◽  
Unusual Behaviour ◽  
Dwarf Elliptical Galaxies ◽  
Index Index ◽  
Star Formation Histories

AbstractThe aim of this study is to determine abundance ratios and star formation histories (SFH) of dwarf ellipticals in the nearby Virgo cluster. We perform a stellar population analysis of 39 dEs and study them using index-index and scaling relations. We find an unusual behaviour where [Na/Fe] is under-abundant w.r.t. solar while [Ca/Fe] is over-abundant.

scholarly journals STAR FORMATION HISTORIES OF BRIGHTEST CLUSTER GALAXIES WITH INTERMEDIATE CENTRAL AGES

2021 ◽  
Vol 57 (2) ◽  
pp. 391-397
Author(s):  
J. Umanzor ◽  
M. L. Talavera
Keyword(s):  
Star Formation ◽  
Elliptical Galaxies ◽  
Large Telescope ◽  
Population Code ◽  
Full Spectrum ◽  
Cluster Galaxies ◽  
Very Large Telescope ◽  
Brightest Cluster Galaxies ◽  
Star Formation Histories ◽  
Spectrum Fitting

This work is devoted to the study of the star formation histories (SFHs) of the brightest cluster galaxies (BCGs) with intermediate central ages (from 5 to 10Gyr), to confirm if BCGs with these ages represent different accretion histories or simply a stochastic effect. The sample is composed of 6 BCGs with intermediate central ages and 3 BCGs with old central ages (> 12Gyr) as comparison galaxies. The galaxies were observed with the integrated field spectrograph VIMOS installed in the Very Large Telescope (VLT). The SFHs were obtained with the full spectrum fitting technique using the star population code STARLIGHT. The BCGs of intermediate central age analyzed formed almost 100% of their stars at z > 2 and their SFHs are similar to the SFHs of BCGs of old central ages and elliptical galaxies of similar mass (MDyn > 1011 Mʘ); therefore, these BCGs do not represent different SFHs.

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