2010MNRAS.405...77S


C.D.S. - SIMBAD4 rel 1.7 - 2021.06.21CEST06:30:07

2010MNRAS.405...77S - Mon. Not. R. Astron. Soc., 405, 77-90 (2010/June-2)

Polytropic dark haloes of elliptical galaxies.

SAXTON C.J. and FERRERAS I.

Abstract (from CDS):

The kinematics of stars and planetary nebulae in early-type galaxies provide vital clues to the enigmatic physics of their dark matter haloes. We fit published data for 14 such galaxies using a spherical, self-gravitating model with two components: (i) a Sérsic stellar profile fixed according to photometric parameters, and (ii) a polytropic dark matter halo that conforms consistently to the shared gravitational potential. The polytropic equation of state can describe extended theories of dark matter involving self-interaction, non-extensive thermostatistics or boson condensation (in a classical limit). In such models, the flat-cored mass profiles widely observed in disc galaxies are due to innate dark physics, regardless of any baryonic agitation. One of the natural parameters of this scenario is the number of effective thermal degrees of freedom of dark matter (Fd) which is proportional to the dark heat capacity. By default, we assume a cosmic ratio of baryonic and dark mass. Non-Sérsic kinematic ideosyncrasies and possible non-sphericity thwart fitting in some cases. In all 14 galaxies, the fit with a polytropic dark halo improves or at least gives similar fits to the velocity dispersion profile, compared to a stars-only model. The good halo fits usually prefer Fd values from six to eight. This range complements the recently inferred limit of 7 < Fd< 10, derived from constraints on galaxy cluster core radii and black hole masses. However, a degeneracy remains: radial orbital anisotropy or a depleted dark mass fraction could shift our models' preference towards lower Fd; whereas a loss of baryons would favour higher Fd.

Abstract Copyright: © 2010 The Authors. Journal compilation © 2010 RAS

Journal keyword(s): stellar dynamics - galaxies: elliptical and lenticular, cD - galaxies: haloes - galaxies: structure - dark matter

Simbad objects: 17

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Number of rows : 17

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 821 G 02 08 21.150 +10 59 41.53   12.210 11.310 10.739 9.744 ~ 546 0
2 NGC 1023 IG 02 40 24.012 +39 03 47.70 10.91 10.35 9.35 7.83   ~ 618 2
3 NGC 1340 GiG 03 28 19.668 -31 04 05.45   11.20 10.32 9.70   ~ 199 1
4 NGC 1400 EmG 03 39 30.851 -18 41 17.25 12.48 12.01 10.96 10.45   ~ 282 1
5 NGC 1407 GiG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 537 1
6 NGC 3377 GiP 10 47 42.400 +13 59 08.30 11.55 11.24 10.38     ~ 736 1
7 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1398 0
8 [WKK93] G G 11 06 33.33 -18 21 24.0           ~ 35 1
9 [VV2006] J111654.8+180304 QSO 11 16 54.657 +18 03 06.51   13.84 12.76     ~ 443 0
10 NGC 3608 LIN 11 16 58.967 +18 08 54.71   11.7       ~ 484 0
11 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1673 2
12 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6055 0
13 NGC 4494 GiP 12 31 24.034 +25 46 29.93   10.55 9.74     ~ 455 0
14 NGC 4564 GiG 12 36 26.994 +11 26 21.55 12.51 12.05 11.12     ~ 570 1
15 NGC 4697 GiG 12 48 35.8992791099 -05 48 02.497675635   10.97   9.83   ~ 815 0
16 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4104 3
17 NGC 5846 BiC 15 06 29.253 +01 36 20.29   11.9   9.74   ~ 791 1

    Equat.    Gal    SGal    Ecl

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2021.06.21-06:30:07

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