2020MNRAS.492.3263G

Query : 2020MNRAS.492.3263G

2020MNRAS.492.3263G - Mon. Not. R. Astron. Soc., 492, 3263-3271 (2020/March-1)

A consistency test for determining whether ultracompact dwarf galaxies could be the remnant nuclei of threshed galaxies.

GRAHAM A.W.

Abstract (from CDS):

It has been suggested that ultracompact dwarf (UCD) galaxies are the `threshed' remains of larger galaxies. Simulations have revealed that extensive tidal-stripping may pare a galaxy back to its tightly bound, compact nuclear star cluster. It has therefore been proposed that the two-component nature of UCD galaxies may reflect the original nuclear star cluster surrounded by the paltry remnants of its host galaxy. A simple quantitative test of this theory is devised and applied here. If the mass of the central black hole (BH) in UCD galaxies, relative to the mass of the UCD galaxies' inner stellar component, i.e. the suspected nuclear star cluster, matches with the (black hole mass)-(nuclear star cluster mass) relation observed in other galaxies, then it would provide quantitative support for the stripped galaxy scenario. Such consistency is found for four of the five UCD galaxies reported to have a massive BH. This (black hole mass)-(nuclear star cluster mass) relation is then used to predict the central BH mass in two additional UCD galaxies, and to reveal that NGC 205 and possibly NGC 404 (which only has an upper limit to its black hole mass) also follow this scaling relation.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: nuclei - galaxies: star clusters: general - galaxies: structure

Simbad objects: 32

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Number of rows : 32
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NAME Mayall II GlC 00 32 46.5323801712 +39 34 40.504803060   14.564 13.807 13.208 12.684 ~ 400 1
3 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
4 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
5 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
6 NGC 404 LIN 01 09 27.02 +35 43 05.3   12.56 11.73     ~ 511 0
7 NGC 1023 AG? 02 40 24.0133575864 +39 03 47.663392896 10.91 10.35 9.35 7.83   ~ 689 2
8 CGF 1-4 GlC 03 38 54.0545340024 -35 33 33.320376180   18.5 18.06     ~ 81 1
9 NGC 3115 GiG 10 05 13.9270507008 -07 43 06.982712292   11   9.37   ~ 1067 2
10 NGC 3319 SyG 10 39 09.533 +41 41 12.74   11.48 11.07     ~ 325 1
11 NGC 4178 H2G 12 12 46.443 +10 51 57.59   12.9       ~ 367 0
12 IC 3292 GiG 12 24 48.3555488664 +18 11 42.410950008   15.5       ~ 90 0
13 NGC 4486B GiG 12 30 31.985 +12 29 24.85   14.5       ~ 428 0
14 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
15 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
16 Hanes IV-67 G 12 30 57.3837738072 +12 25 44.498928792   19.32 17.97     ~ 54 0
17 IC 3442 GiG 12 31 20.1836306184 +14 06 54.669163572   15.4       ~ 109 0
18 [NK2011] NGC 4546 UCD1 G 12 35 28.70 -03 47 21.1           ~ 21 0
19 NGC 4546 Sy2 12 35 29.4931619736 -03 47 35.383858656 11.89 11.30 10.32     ~ 230 1
20 IC 3602 GiG 12 38 07.097 +10 04 57.22   15.5       ~ 86 0
21 IC 3633 GiG 12 40 11.2491451848 +09 53 46.054801392   15.4       ~ 82 0
22 SDSS J124155.33+114003.7 G 12 41 55.3338419712 +11 40 03.790134948           ~ 56 0
23 SDSS J124211.04+113841.2 G 12 42 11.0513 +11 38 41.257           ~ 42 0
24 NAME M60-UCD1 G 12 43 35.9688 +11 32 04.700           ~ 100 0
25 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
26 [VHH81] 21 GlC 13 25 52.7266111104 -43 05 46.501781856 19.16 18.76 17.87 17.32 16.77 ~ 51 0
27 CXOU J132554.5-425924 GlC 13 25 54.5684562024 -42 59 25.329473880 18.92 18.29 17.22 16.62 15.95 ~ 49 0
28 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
29 NGC 6624 GlC 18 23 40.51 -30 21 39.7           ~ 939 1
30 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
31 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
32 NAME Local Group GrG ~ ~           ~ 9325 0

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