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Titolo:
Energy, entropy and mass scaling relations for elliptical galaxies. Towards a physical understanding of their photometric properties
Autore:
Marquez, I; Neto, GBL; Capelato, H; Durret, F; Lanzoni, B; Gerbal, D;
Indirizzi:
CSIC, Inst Astrofis Andalucia, E-18080 Granada, Spain CSIC Granada SpainE-18080 st Astrofis Andalucia, E-18080 Granada, Spain USP, Inst Astron & Geofis, BR-09500900 Sao Paulo, Brazil USP Sao Paulo Brazil BR-09500900 BCGeofis, BR-09500900 Sao Paulo, Brazil Inst Nacl Pesquisas Espaciais, BR-12201 Sao Jose Dos Campos, SP, Brazil Inst Nacl Pesquisas Espaciais Sao Jose Dos Campos SP Brazil BR-12201 azil CNRS, Inst Astrophys Paris, F-75014 Paris, France CNRS Paris France F-75014 S, Inst Astrophys Paris, F-75014 Paris, France Univ Paris 07, Observ Paris, DAEC, CNRS,UA 173, F-92195 Meudon, France Univ Paris 07 Meudon France F-92195 CNRS,UA 173, F-92195 Meudon, France Osservatorio Astron Bologna, I-40127 Bologna, Italy Osservatorio Astron Bologna Bologna Italy I-40127 I-40127 Bologna, Italy
Titolo Testata:
ASTRONOMY & ASTROPHYSICS
fascicolo: 3, volume: 379, anno: 2001,
pagine: 767 - 780
SICI:
1432-0746(200112)379:3<767:EEAMSR>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
FUNDAMENTAL PLANE; DISTANCE INDICATOR; LUMINOSITY-PROFILE; DARK-MATTER; CLUSTER; SHAPE; DYNAMICS; SYSTEMS; MERGERS;
Keywords:
galaxies : clusters : individual (Coma, Abell 85; Abell 496); galaxies : elliptical and lenticular, cD; galaxies : fundamental parameters; distance scale; gravitation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Marquez, I CSIC, Inst Astrofis Andalucia, Apartado 3004, E-18080 Granada, Spain CSIC Apartado 3004 Granada Spain E-18080 -18080 Granada, Spain
Citazione:
I. Marquez et al., "Energy, entropy and mass scaling relations for elliptical galaxies. Towards a physical understanding of their photometric properties", ASTRON ASTR, 379(3), 2001, pp. 767-780

Abstract

In the present paper, we show that elliptical galaxies (Es) obey a scalingrelation between potential energy and mass. Since they are relaxed systemsin a post violent-relaxation stage, they are quasi-equilibrium gravitational systems and therefore they also have a quasi-constant specific entropy. Assuming that light traces mass, these two laws imply that in the space defined by the three Sersic law parameters (intensity Sigma (0), scale a and shape v), elliptical galaxies are distributed on two intersecting 2-manifolds: the Entropic Surface and the Energy-Mass Surface. Using a sample of 132 galaxies belonging to three nearby clusters, we have verified that ellipticals indeed follow these laws. This also implies that they are distributed along the intersection line (the Energy-Entropy line), thus they constitute a one-parameter family. These two physical laws (separately or combined), allow to find the theoretical origin of several observed photometrical relations, such as the correlation between absolute magnitude and effective surface brightness, and the fact that ellipticals are located on a surface in the [log R-eff, -2:5 log Sigma (0); log v] space. The fact that elliptical galaxies are a one-parameter family has important implications for cosmologyand galaxy formation and evolution models. Moreover, the Energy-Entropy line could be used as a distance indicator.

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Documento generato il 18/01/21 alle ore 14:08:51