2014MNRAS.441.2650K


Query : 2014MNRAS.441.2650K

2014MNRAS.441.2650K - Mon. Not. R. Astron. Soc., 441, 2650-2662 (2014/July-1)

To be or not to be oblate: the shape of the dark matter halo in polar ring galaxies.

KHOPERSKOV S.A., MOISEEV A.V., KHOPERSKOV A.V. and SABUROVA A.S.

Abstract (from CDS):

With the aim of determining the spatial distribution of the dark matter halo, we investigate two polar ring galaxies, NGC 4262 and SPRC-7. For both galaxies, the stellar kinematics data for the central galaxy were obtained from optical spectroscopy at the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences. Information about polar gaseous components was taken from optical three-dimensional spectroscopic observations of ionized gas (for SPRC-7) and from Hi radio observations (for NGC 4262). SPRC-7 is a system with a relative angle δ = 73° towards the central galaxy and quite a massive stellar-gaseous polar component. Meanwhile, NGC 4262 is a classic polar case with δ = 88°, where the polar ring mainly consists of neutral gas with a negligible stellar contribution to the mass. Thus, we are dealing with two different systems, and the results are also diverse. The observed properties of both galaxies were compared with the results of self-consistent simulations of velocity fields of the polar component along with the rotation curve of the central lenticular galaxy. For SPRC-7, we have found a slightly flattened halo towards the polar plane with the axial ratio c/a ≃ 1.7±0.2 for the isothermal halo model and c/a ≃ 1.5±0.2 for the NFW model. NGC 4262 is more unusual, because the shape of the dark matter distribution varies strongly with radius. That is, the dark matter halo is flattened in the vicinity of the galactic disc (c/a ~ 0.4±0.1), but it is prolate far beyond the central galaxy (c/a ~ 1.7 for the isothermal halo model and c/a ~ 2.3 for the NFW model).

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): galaxies: evolution - galaxies: haloes - galaxies: kinematics and dynamics

CDS comments: SPRC-7 is SDSS J075234.32+292049.7 in Simbad.

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 IC 51 IG 00 46 24.215 -13 26 32.63   13.41   12.69 12.8 ~ 85 0
2 2MASX J01385522-0745553 GiC 01 38 55.2336829296 -07 45 55.565640144   15.62       ~ 69 0
3 NGC 660 Sy2 01 43 02.350 +13 38 44.45   12.02 11.16     ~ 544 2
4 NAME Sagittarius Stream St* 02 22 +00.0           ~ 799 0
5 ESO 415-26 G 02 28 20.1024142368 -31 52 51.628774224   14.6   13.14   ~ 74 0
6 IC 2006 EmG 03 54 28.4628183240 -35 58 01.673622516   12.39   10.94 11.9 ~ 203 0
7 SDSS J075234.32+292049.7 G 07 52 34.3259200008 +29 20 49.702856748           ~ 16 0
8 NVSS J081056+364947 rG 08 10 56.118 +36 49 45.60   14.7       ~ 43 0
9 NGC 2685 Sy2 08 55 34.7027817000 +58 44 03.876540108   13.68 12.70     ~ 421 1
10 NGC 3718 GiP 11 32 34.8571790688 +53 04 04.520222040   11.35 10.61     ~ 368 1
11 NGC 4262 GiG 12 19 30.5694336288 +14 52 39.517143276 13.00 12.49 11.55     ~ 346 1
12 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6377 0
13 UGC 7576 GiC 12 27 41.8591778952 +28 41 53.026524312   16.0       ~ 62 0
14 ESO 322-69 GiG 12 44 49.0352044176 -40 42 51.691570488   14.12 13.58 13.29 13.9 ~ 192 0
15 NGC 4753 GiG 12 52 22.112 -01 11 58.88 11.26 10.85 9.95     ~ 267 1
16 NGC 5122 GiG 13 24 14.9402501712 -10 39 15.431171292   14   13.36   ~ 46 0
17 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 738 1
18 UGC 9796 GiP 15 15 56.3061737160 +43 10 00.480168228   16.0       ~ 43 0
19 AM 1934-563 G 19 38 39 -56 27.3           ~ 14 1
20 2MASX J20235495-5039063 GiG 20 23 54.9120351168 -50 39 06.848951112   14.72   13.59   ~ 56 0

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2023.01.28-11:36:52

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