scholarly journals Early-type Galaxies in the Sloan Digital Sky Survey. II. Correlations between Observables

2003 ◽  
Vol 125 (4) ◽  
pp. 1849-1865 ◽  
Author(s):  
Mariangela Bernardi ◽  
Ravi K. Sheth ◽  
James Annis ◽  
Scott Burles ◽  
Daniel J. Eisenstein ◽  
...  
Keyword(s):  
Sloan Digital Sky Survey ◽  
Early Type ◽  
Sky Survey

scholarly journals Dozens of compact and high velocity-dispersion, early-type galaxies in Sloan Digital Sky Survey

2015 ◽  
Vol 578 ◽  
pp. A134 ◽  
Author(s):  
Christoph Saulder ◽  
Remco C. E. van den Bosch ◽  
Steffen Mieske
Keyword(s):  
High Velocity ◽  
Velocity Dispersion ◽  
Sloan Digital Sky Survey ◽  
Early Type ◽  
Sky Survey

scholarly journals Early-Type Galaxies in the Sloan Digital Sky Survey. III. The Fundamental Plane

2003 ◽  
Vol 125 (4) ◽  
pp. 1866-1881 ◽  
Author(s):  
Mariangela Bernardi ◽  
Ravi K. Sheth ◽  
James Annis ◽  
Scott Burles ◽  
Daniel J. Eisenstein ◽  
...  
Keyword(s):  
Sloan Digital Sky Survey ◽  
Early Type ◽  
Fundamental Plane ◽  
Sky Survey

scholarly journals Early-Type Galaxies in the Sloan Digital Sky Survey. IV. Colors and Chemical Evolution

2003 ◽  
Vol 125 (4) ◽  
pp. 1882-1896 ◽  
Author(s):  
Mariangela Bernardi ◽  
Ravi K. Sheth ◽  
James Annis ◽  
Scott Burles ◽  
Douglas P. Finkbeiner ◽  
...  
Keyword(s):  
Chemical Evolution ◽  
Sloan Digital Sky Survey ◽  
Early Type ◽  
Sky Survey

scholarly journals Comparison of Composite and Star-forming Early-type Galaxies

2021 ◽  
Vol 163 (1) ◽  
pp. 28
Author(s):  
Yu-Zhong Wu
Keyword(s):  
Star Formation ◽  
Stellar Mass ◽  
Sloan Digital Sky Survey ◽  
Early Type ◽  
Massive Galaxies ◽  
Star Forming ◽  
Sky Survey ◽  
Excitation Mechanisms ◽  
Stellar Masses ◽  
Evolution Scheme

Abstract I assemble 4684 star-forming early-type galaxies (ETGs) and 2011 composite ETGs (located in the composite region on the BPT diagram) from the catalog of the Sloan Digital Sky Survey Data Release 7 MPA-JHU emission-line measurements. I compare the properties of both ETG samples and investigate their compositions, stellar masses, specific star formation rates (sSFRs), and excitation mechanisms. Compared with star-forming ETGs, composite ETGs have higher stellar mass and lower sSFR. In the stellar mass and u − r color diagram, more than 60% of star-forming ETGs and composite ETGs are located in the green valley, showing that the two ETG samples may have experienced star formation and that ∼17% of star-forming ETGs lie in the blue cloud, while ∼30% of composite ETGs lie in the red sequence. In the [N II]/Hα versus EWHα (the Hα equivalent width) diagram, all star-forming ETGs and most of the composite ETGs are located in the star-forming galaxy region, and composite ETGs have lower EWHα than their counterparts. We show the relations between 12+log(O/H) and log(N/O) for both ETG samples, and suggest that nitrogen production of some star-forming ETGs can be explained by the evolution scheme of Coziol et al., while the prodution of composite ETGs may be a consequence of the inflowing of metal-poor gas and these more evolved massive galaxies.

scholarly journals The quantity of dark matter in early-type galaxies and its relation to the environment

2019 ◽  
Vol 488 (1) ◽  
pp. 1320-1331 ◽  
Author(s):  
A Nigoche-Netro ◽  
G Ramos-Larios ◽  
P Lagos ◽  
E de la Fuente ◽  
A Ruelas-Mayorga ◽  
...  
Keyword(s):  
Dark Matter ◽  
Surface Brightness ◽  
Stellar Mass ◽  
Sloan Digital Sky Survey ◽  
Early Type ◽  
Dynamical Mass ◽  
Redshift Range ◽  
Sky Survey ◽  
The Impact ◽  
Mass Functions

ABSTRACT We study the behaviour of the dynamical and stellar mass inside the effective radius of early-type galaxies (ETGs) as a function of environment considering Newtonian dynamics, different surface-brightness profiles, different initial mass functions (IMF), and different redshift ranges. We use several samples of ETGs – ranging from 19 000 to 98 000 objects – from the ninth data release of the Sloan Digital Sky Survey. We assume that any difference between the dynamical and stellar mass is due to dark matter and/or a non-universal IMF. The main results, considering samples in the redshift range 0.0024 ≤ z ≤ 0.35, are as follows: (i) the amount of dark matter inside ETGs depends on the environment; (ii) ETGs in low-density environments span a wider dark matter range than ETGs in dense environments; (iii) the amount of dark matter inside ETGs in the most dense environments will be less than approximately 55–75 per cent of the dynamical mass; (iv) the accurate value of this upper limit depends on the impact of the IMF on the stellar mass estimation; (v) in the case of an ETG sample which is approximately complete for log(MVirial/MSun) > 10.5 and in the redshift range 0.04 ≤ z ≤ 0.08, we find that the amount of dark matter in the most dense environments will be less than approximately 60–65 per cent of the dynamical mass.

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