2016ApJ...825L...6B


Query : 2016ApJ...825L...6B

2016ApJ...825L...6B - Astrophys. J., 825, L6-L6 (2016/July-1)

A dipole on the sky: predictions for hypervelocity stars from the Large Magellanic Cloud.

BOUBERT D. and EVANS N.W.

Abstract (from CDS):

We predict the distribution of hypervelocity stars (HVSs) ejected from the Large Magellanic Cloud (LMC), under the assumption that the dwarf galaxy hosts a central massive black hole (MBH). For the majority of stars ejected from the LMC, the orbital velocity of the LMC has contributed a significant fraction of their galactic rest-frame velocity, leading to a dipole density distribution on the sky. We quantify the dipole using spherical harmonic analysis and contrast with the monopole expected for HVSs ejected from the Galactic center (GC). There is a tendril in the density distribution that leads the LMC, which is coincident with the well-known and unexplained clustering of HVSs in the constellations of Leo and Sextans. Our model is falsifiable since it predicts that Gaia will reveal a large density of HVSs in the southern hemisphere.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy: halo - Galaxy: stellar content - Magellanic Clouds

Simbad objects: 10

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Number of rows : 10
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 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
4 HE 0437-5439 HS* 04 38 12.7828168224 -54 33 11.834984736 15.37 16.18 16.42     sdB+F 81 0
5 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
6 NAME Sextans dSph LSB 10 13 02.9 -01 36 53   12 10.4     ~ 921 0
7 PB 3877 HS* 12 11 50.2659399816 +14 37 16.213280448           sdB+K3V 25 1
8 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
9 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
10 NAME Local Group GrG ~ ~           ~ 9325 0

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