scholarly journals Collisional Relaxation and Dynamical Scaling in Multiparticle Collisions Dynamics

2019 ◽  
pp. 364-374
Author(s):  
Stefano Lepri ◽  
Hugo Bufferand ◽  
Guido Ciraolo ◽  
Pierfrancesco Di Cintio ◽  
Philippe Ghendrih ◽  
...  
Keyword(s):  
Collisional Relaxation ◽  
Dynamical Scaling

scholarly journals A Precise Benchmark for Cluster Scaling Relations: Fundamental Plane, Mass Plane and IMF in the Coma Cluster from Dynamical Models

2020 ◽  
Author(s):  
Shravan Shetty ◽  
Michele Cappellari ◽  
Richard M McDermid ◽  
Davor Krajnović ◽  
P T de Zeeuw ◽  
...  
Keyword(s):  
Galaxy Formation ◽  
Scaling Relations ◽  
Coma Cluster ◽  
Dynamical Models ◽  
Fundamental Plane ◽  
Cluster Galaxies ◽  
Dynamical Scaling ◽  
Small Uncertainty ◽  
Cluster Distance ◽  
Using Data

Abstract We study a sample of 148 early-type galaxies in the Coma cluster using SDSS photometry and spectra, and calibrate our results using detailed dynamical models for a subset of these galaxies, to create a precise benchmark for dynamical scaling relations in high-density environments. For these galaxies, we successfully measured global galaxy properties, modeled stellar populations, and created dynamical models, and support the results using detailed dynamical models of 16 galaxies, including the two most massive cluster galaxies, using data taken with the SAURON IFU. By design, the study provides minimal scatter in derived scaling relations due to the small uncertainty in the relative distances of galaxies compared to the cluster distance. Our results demonstrate low (≤55% for 90th percentile) dark matter fractions in the inner 1Re of galaxies. Owing to the study design, we produce the tightest, to our knowledge, IMF-σe relation of galaxies, with a slope consistent with that seen in local galaxies. Leveraging our dynamical models, we transform the classical Fundamental Plane of the galaxies to the Mass Plane. We find that the coefficients of the mass plane are close to predictions from the virial theorem, and have significantly lower scatter compared to the Fundamental plane. We show that Coma galaxies occupy similar locations in the (M* - Re) and (M* - σe) relations as local field galaxies but are older. This, and the fact we find only three slow rotators in the cluster, is consistent with the scenario of hierarchical galaxy formation and expectations of the kinematic morphology-density relation.

Collisional relaxation times in a three-level maser

1977 ◽  
Vol 26 (2) ◽  
pp. 319-326 ◽  
Author(s):  
C. Bottcher ◽  
C. Feuillade
Keyword(s):  
Relaxation Times ◽  
Collisional Relaxation

Speed dependence of collisional relaxation in ground vibrational state of OCS: Rotational behaviour

2012 ◽  
Vol 136 (12) ◽  
pp. 124316 ◽  
Author(s):  
Maxim A. Koshelev ◽  
Mikhail Yu. Tretyakov ◽  
François Rohart ◽  
Jean-Pierre Bouanich
Keyword(s):  
Vibrational State ◽  
Rotational Behaviour ◽  
Collisional Relaxation ◽  
Ground Vibrational State ◽  
Speed Dependence
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