scholarly journals The velocity dispersion function of early-type galaxies and its redshift evolution: the newest results from lens redshift test

2021 ◽  
Author(s):  
Shuaibo Geng ◽  
Shuo Cao ◽  
Yuting Liu ◽  
Tonghua Liu ◽  
Marek Biesiada ◽  
...  
Keyword(s):  
Velocity Dispersion ◽  
Cosmic Time ◽  
Dispersion Function ◽  
Gravitational Lenses ◽  
Early Type ◽  
Number Density ◽  
Redshift Distribution ◽  
Perfect Agreement ◽  
Galaxy Surveys ◽  
Early Type Galaxy

Abstract The redshift distribution of galactic-scale lensing systems provides a laboratory to probe the velocity dispersion function (VDF) of early-type galaxies (ETGs) and measure the evolution of early-type galaxies at redshift z ∼ 1. Through the statistical analysis of the currently largest sample of early-type galaxy gravitational lenses, we conclude that the VDF inferred solely from strong lensing systems is well consistent with the measurements of SDSS DR5 data in the local universe. In particular, our results strongly indicate a decline in the number density of lenses by a factor of two and a 20% increase in the characteristic velocity dispersion for the early-type galaxy population at z ∼ 1. Such VDF evolution is in perfect agreement with the ΛCDM paradigm (i.e., the hierarchical build-up of mass structures over cosmic time) and different from ”stellar mass-downsizing” evolutions obtained by many galaxy surveys. Meanwhile, we also quantitatively discuss the evolution of the VDF shape in a more complex evolution model, which reveals its strong correlation with that of the number density and velocity dispersion of early-type galaxies. Finally, we evaluate if future missions such as LSST can be sensitive enough to place the most stringent constraints on the redshift evolution of early-type galaxies, based on the redshift distribution of available gravitational lenses.

Kinematics and stellar populations of the double-barred early-type galaxy NGC357

2007 ◽  
Vol 3 (S245) ◽  
pp. 137-138
Author(s):  
Adriana de Lorenzo-Cáceres ◽  
Alexandre Vazdekis ◽  
J. Alfonso L. Aguerri
Keyword(s):  
Radial Velocity ◽  
Stellar Population ◽  
Velocity Dispersion ◽  
Population Analysis ◽  
Stellar Populations ◽  
Abundance Ratio ◽  
Complete Characterization ◽  
Early Type ◽  
Early Type Galaxy

AbstractWe have carried out a kinematical and stellar population analysis of the double-barred galaxy NGC357 to provide a more complete characterization of these systems and their role in the formation of galaxy bulges. We clearly identify the presence of the inner bar in the radial velocity and velocity dispersion profiles. The age, metallicity and [Mg/Fe] abundance ratio estimates are very similar to those of ellipticals of equivalent central σ. The [Mg/Fe] value for the bulge of this galaxy suggests formation timescales shorter than 1Gyr.

Planetary nebulae as kinematic tracers of galaxy halos

2015 ◽  
Vol 11 (A29B) ◽  
pp. 20-25 ◽  
Author(s):  
Lodovico Coccato ◽  
Keyword(s):  
Surface Brightness ◽  
Velocity Dispersion ◽  
Spiral Galaxies ◽  
Planetary Nebulae ◽  
Early Type ◽  
Number Density ◽  
Host Galaxies ◽  
Galaxy Halos ◽  
Radial Profiles ◽  
Dynamical Properties

AbstractThe kinematics and dynamical properties of galaxy stellar halos are difficult to measure, given the faint surface brightness that characterizes these regions. Gas-rich systems such as spiral galaxies can be probed using the radio Hi emission. Early-type galaxies contain less gas, therefore alternative kinematic tracers need to be used. Planetary Nebulae (PNe) can be easily detected far out in the halo thanks to their bright [O iii] emission at 5007 Å. It is therefore possible to map the halo kinematics also in early-type galaxies, typically out to 5 effective radii or beyond. Thanks to the recent spectroscopic surveys targeting extra-galactic PNe, we can now rely on few tens of galaxies where the kinematics of the stellar halos are measured. I will discuss the most important results: (a) the relation of the stellar surface brightness and the PNe number density; (b) the velocity and velocity dispersion two-dimensional fields; (c) the radial profiles of angular momentum; and (d) the relation between the derived kinematics physical properties of the host galaxies.

scholarly journals The Velocity Dispersion Function of Early‐Type Galaxies

2003 ◽  
Vol 594 (1) ◽  
pp. 225-231 ◽  
Author(s):  
Ravi K. Sheth ◽  
Mariangela Bernardi ◽  
Paul L. Schechter ◽  
Scott Burles ◽  
Daniel J. Eisenstein ◽  
...  
Keyword(s):  
Velocity Dispersion ◽  
Dispersion Function ◽  
Early Type

scholarly journals Stellar Populations in the Most Luminous Obscured Quasars at z > 0.5

2012 ◽  
Vol 8 (S295) ◽  
pp. 178-178
Author(s):  
Xin Liu
Keyword(s):  
Black Holes ◽  
Velocity Dispersion ◽  
Star Formation Rate ◽  
Formation Rate ◽  
Cosmic Time ◽  
Stellar Populations ◽  
Spectroscopic Studies ◽  
Number Density ◽  
Host Galaxies ◽  
Crucial Information

There is evidence that the growth of stellar populations and supermassive black holes (SMBHs) are coupled across cosmic time: the redshift evolution of star formation rate and quasar number density are similar; SMBH masses in local inactive galaxies are correlated with the velocity dispersion of their stellar bulges. Models predict that SMBHs predominantly grow in brief quasar phases accompanied by starbursts, but on-going starbursts in luminous quasars have been difficult to quantify. There have been extensive photometric studies of quasar host galaxies. However, spectroscopic studies that provide crucial information on stellar populations such as age and velocity dispersion are scarce, especially at the highest luminosities, where the stars are vastly outshone by the quasar.

scholarly journals Planetary nebulae as kinematic tracers of galaxy halos

2015 ◽  
Vol 11 (A29B) ◽  
Author(s):  
Lodovico Coccato ◽  
Keyword(s):  
Surface Brightness ◽  
Velocity Dispersion ◽  
Spiral Galaxies ◽  
Planetary Nebulae ◽  
Early Type ◽  
Number Density ◽  
Host Galaxies ◽  
Galaxy Halos ◽  
Radial Profiles ◽  
Dynamical Properties

AbstractThe kinematics and dynamical properties of galaxy stellar halos are difficult to measure, given the faint surface brightness that characterizes these regions. Gas-rich systems such as spiral galaxies can be probed using the radio Hi emission. Early-type galaxies contain less gas, therefore alternative kinematic tracers need to be used. Planetary Nebulae (PNe) can be easily detected far out in the halo thanks to their bright [Oiii] emission at 5007 Å. It is therefore possible to map the halo kinematics also in early-type galaxies, typically out to 5 effective radii or beyond. Thanks to the recent spectroscopic surveys targeting extra-galactic PNe, we can now rely on few tens of galaxies where the kinematics of the stellar halos are measured. I will discuss the most important results: (a) the relation of the stellar surface brightness and the PNe number density; (b) the velocity and velocity dispersion two-dimensional fields; (c) the radial profiles of angular momentum; and (d) the relation between the derived kinematics physical properties of the host galaxies.

scholarly journals The Evolution of Passive Galaxies since z=1: Major Mergers vs Secular Processes

2009 ◽  
Vol 5 (S262) ◽  
pp. 209-212
Author(s):  
Carlos López-Sanjuan ◽  
Marc Balcells ◽  
Pablo G. Pérez-González ◽  
Guillermo Barro ◽  
César Enrique García-Dabó ◽  
...  
Keyword(s):  
Cosmic Time ◽  
Sequence Evolution ◽  
Early Type ◽  
Number Density ◽  
Star Forming ◽  
Secular Evolution ◽  
Major Merger ◽  
Minor Mergers ◽  
Merger Rate ◽  
Red Sequence

AbstractWe study the evolution of the red sequence and the blue cloud since z ~ 1 to present in GOODS-S field for MB ≤ −20 and M* ≥ 1010M⊙ selected galaxies. We segregate the galaxies in early-type galaxies (ET, E/S0/Sa), and late-type galaxies (LT, Sb-Irr) by their position in the concentration-asymmetry plane, while in passive and star-forming by their rest-frame NUV – R color and their 24μm properties.We find that red sequence (passive early types) comoving number density rise with cosmic time in both samples, while blue cloud (star-forming late types) number density descent in luminosity-selected samples and increase in mass-selected sample. We also find a third population that comprises star-forming early-type galaxies.Comparing the observed evolution with the disk-disk (wet) major merger rate in GOODS-S, we infer that only ~20% of M* ≥ 1010M⊙ red sequence galaxies appeared since z = 1 can be explained by this kind of mergers, suggesting that minor mergers and secular evolution are the main processes in the red sequence evolution of M* ≥ 1010M⊙ galaxies since z ~ 1.

scholarly journals The Rapid Buildup of Massive Early-type Galaxies: Supersolar Metallicity, High Velocity Dispersion, and Young Age for an Early-type Galaxy at z = 3.35

2020 ◽  
Vol 905 (1) ◽  
pp. 40
Author(s):  
Paolo Saracco ◽  
Danilo Marchesini ◽  
Francesco La Barbera ◽  
Adriana Gargiulo ◽  
Marianna Annunziatella ◽  
...  
Keyword(s):  
High Velocity ◽  
Velocity Dispersion ◽  
Young Age ◽  
Early Type ◽  
Early Type Galaxy

Stellar Metallicities and Type Ia Supernova Rates in the Early‐Type Galaxy NGC 5846 fromROSATandASCAObservations

1999 ◽  
Vol 514 (2) ◽  
pp. 844-855 ◽  
Author(s):  
A. Finoguenov ◽  
C. Jones ◽  
W. Forman ◽  
L. David
Keyword(s):  
Early Type ◽  
Type Ia Supernova ◽  
Type Ia ◽  
Early Type Galaxy
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