2008A&A...478L..23R


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.03CET10:03:49

2008A&A...478L..23R - Astronomy and Astrophysics, volume 478, L23-26 (2008/2-1)

The dark matter halo of NGC1399 - CDM or MOND?

RICHTLER T., SCHUBERTH Y., HILKER M., DIRSCH B., BASSINO L. and ROMANOWSKY A.J.

Abstract (from CDS):

Central galaxies in galaxy clusters may be key discriminants in the competition between the cold dark matter (CDM) paradigm and modified Newtonian dynamics (MOND). We investigate the dark halo of NGC1399, the central galaxy of the Fornax cluster, out to a galactocentric distance of 80kpc. The data base consists of 656 radial velocities of globular clusters obtained with MXU/VLT and GMOS/Gemini, which is the largest sample so far for any galaxy. We performed a Jeans analysis for a non-rotating isotropic model.An NFW halo with the parameters rs=50kpc and ρs=0.0065M/pc3 provides a good description of our data, fitting well to the X-ray mass. More massive halos are also permitted that agree with the mass of the Fornax cluster as derived from galaxy velocities. We compare this halo with the expected MOND models under isotropy and find that additional dark matter on the order of the stellar mass is needed to get agreement. A fully radial infinite globular cluster system would be needed to change this conclusion. Regarding CDM, we cannot draw firm conclusions. To really constrain a cluster wide halo, more data covering a larger radius are necessary. The MOND result appears as a small-scale variant of the finding that MOND in galaxy clusters still needs dark matter.

Abstract Copyright:

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: kinematics and dynamics - galaxies: individual: NGC 1399

Simbad objects: 9

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Number of rows : 9

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 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1473 1
2 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1589 0
3 NGC 1404 GiP 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 678 1
4 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1392 0
5 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1985 2
6 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6351 3
7 NGC 4636 LIN 12 42 49.867 +02 41 16.01   12.62 11.84     ~ 1048 1
8 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1115 1
9 3C 338.0 QSO 16 28 38.2447110 +39 33 04.233634   12.78 11.78     ~ 713 5

    Equat.    Gal    SGal    Ecl

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2021.03.03-10:03:49

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