2020MNRAS.492.5247S

Query : 2020MNRAS.492.5247S

2020MNRAS.492.5247S - Mon. Not. R. Astron. Soc., 492, 5247-5260 (2020/March-2)

Improved constraints from ultra-faint dwarf galaxies on primordial black holes as dark matter.

STEGMANN J., CAPELO P.R., BORTOLAS E. and MAYER L.

Abstract (from CDS):

Soon after the recent first ever detection of gravitational waves from merging black holes it has been suggested that their origin is primordial. Appealingly, a sufficient number of primordial black holes (PBHs) could also partially or entirely constitute the dark matter (DM) in our Universe. However, recent studies on PBHs in ultra-faint dwarf galaxies (UFDGs) suggest that they would dynamically heat up the stellar component due to two-body relaxation processes. From the comparison with the observed stellar velocity dispersions and the stellar half-light radii, it was claimed that only PBHs with masses <= 10 M_☉ can significantly contribute to the DM. In this work, we improve the latter constraints by considering the largest observational sample of UFDGs and by allowing the PBH masses to follow an extended (lognormal) distribution. By means of collisional Fokker-Planck simulations, we explore a wide parameter space of UFDGs containing PBHs. The analysis of the half-light radii and velocity dispersions resulting from the simulations leads to three general findings that exclude PBHs with masses ∼ O(1-100) M_☉ from constituting all of the DM: (i) we identify a critical sub-sample of UFDGs that only allows for ∼ O(1) M_☉ PBH masses; (ii) for any PBH mass, there is an UFDG in our sample that disfavours it; (iii) the spatial extensions of a majority of simulated UFDGs containing PBHs are too large to match the observed.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): black hole physics - methods: numerical - galaxies: dwarf - dark matter

Simbad objects: 27

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Number of rows : 27
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 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
2 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
3 NAME Hydrus I G 02 29 33.4 -79 18 32           ~ 80 0
4 NAME Hor I G 02 55 31.7 -54 07 08           ~ 169 0
5 NAME Reticulum II G 03 35 42.1 -54 02 57           ~ 375 0
6 NAME Eridanus II G 03 44 21.1 -43 32 00           ~ 216 0
7 NAME Carina II Dwarf Galaxy G 07 36 25.6 -57 59 57           ~ 86 0
8 NAME Car III Dwarf Galaxy G 07 38 31.2 -57 53 59           ~ 81 0
9 NAME UMa II Galaxy G 08 51 30.0 +63 07 48     13.3     ~ 410 0
10 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
11 NAME UMa I Galaxy G 10 34 52.80 +51 55 12.0     14.4     ~ 355 1
12 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
13 NAME Leo V LSB 11 31 09.60 +02 13 12.0     16.0     ~ 234 0
14 NAME Leo IV LSB 11 32 57.0 -00 32 00     15.1     ~ 419 1
15 NAME Hydra II G 12 21 42.1 -31 59 07           ~ 118 0
16 NAME Coma Dwarf Galaxy G 12 26 59.0 +23 54 15     14.1     ~ 482 1
17 NAME CVn II dSph G 12 57 09.6 +34 19 12     16.1     ~ 287 2
18 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
19 NAME Bootes Dwarf Spheroidal Galaxy G 14 00 00.0 +14 30 00     12.8     ~ 491 0
20 NAME Draco II Gl? 15 52 47.6 +64 33 55           ~ 138 0
21 NAME Hercules Dwarf Galaxy G 16 31 02.0 +12 47 30     14.0     ~ 379 1
22 NAME Pegasus III LSB 22 24 22.6 +05 25 12           ~ 69 0
23 NAME Aquarius 2 G 22 33 55.5 -09 19 39           ~ 66 0
24 NAME Tuc II G 22 51 55.1 -58 34 08           ~ 192 0
25 NAME Grus I G 22 56 42.4 -50 09 48           ~ 126 0
26 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
27 NAME Tuc III G 23 56.6 -59 36           ~ 229 0

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