2018ApJ...866...39B

Query : 2018ApJ...866...39B

2018ApJ...866...39B - Astrophys. J., 866, 39-39 (2018/October-2)

Gaia and the Galactic Center origin of hypervelocity stars.

BROWN W.R., LATTANZI M.G., KENYON S.J. and GELLER M.J.

Abstract (from CDS):

We use new Gaia measurements to explore the origin of the highest velocity stars in the hypervelocity star (HVS) survey. The measurements reveal a clear pattern in B-type stars. Halo stars dominate the sample at speeds of ≃100 km s–1 below Galactic escape velocity. Disk runaway stars have speeds up to ≃100 km s–1 above Galactic escape velocity, but most disk runaways are bound. Stars with speeds >=100 km s–1 above Galactic escape velocity originate from the Galactic center. Two bound stars may also originate from the Galactic center. Future Gaia measurements will enable a large, clean sample of Galactic center ejections for measuring the massive black hole ejection rate of HVSs, and for constraining the mass distribution of the Milky Way dark matter halo.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): Galaxy: halo - Galaxy: kinematics and dynamics - stars: early-type - stars: kinematics and dynamics

CDS comments: Stars B080 and B149 are not in SIMBAD.

Simbad objects: 44

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Number of rows : 44
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 SDSS J002810.33+215809.6 HV* 00 28 10.3294287336 +21 58 09.685026012           B 4 0
2 SDSS J005956.06+313439.2 HV* 00 59 56.0616669120 +31 34 39.319232520           B 4 0
3 HE 0437-5439 HS* 04 38 12.7828168224 -54 33 11.834984736 15.37 16.18 16.42     sdB+F 81 0
4 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
5 HD 271791 HV* 06 02 27.8785167216 -66 47 28.695328404   12.17 12.28     B2(III) 73 0
6 SDSS J074950.24+243841.2 HV* 07 49 50.2371016152 +24 38 41.171992404           B8 10 0
7 SDSS J081828.07+570922.1 HV* 08 18 28.0596415704 +57 09 22.105831968           B9 10 0
8 SDSS J090710.08+365957.5 HV* 09 07 10.0822194984 +36 59 57.516238572           B9 11 0
9 [BGK2006] HV 1 HV* 09 07 44.9922286848 +02 45 06.878226600     19.84     B 48 0
10 [BGK2006] HV 4 HS* 09 13 01.0031830944 +30 51 19.878673752   18.1 18.5     sdB/sdO 24 0
11 [BGK2006] HV 5 HV* 09 17 59.4745317960 +67 22 38.377645896     17.70     B 25 0
12 US 708 HS* 09 33 20.8631859264 +44 17 05.495440452   18.5 18.8     sdOHe 103 0
13 [BGK2006] HV 8 HV* 09 42 14.0373776496 +20 03 22.048679124           B 19 0
14 Ton 30 HS* 10 10 18.8246436384 +30 20 28.168497816   16.02 15.96     B5V 28 0
15 [BGK2006] J101359.79+563111.7 HV* 10 13 59.7911018160 +56 31 11.623629468     19.95     A 8 0
16 [BGK2006] HV 9 HB* 10 21 37.0841538528 -00 52 34.724086248     18.76     B 16 0
17 2QZ J103357.2-011508 HV* 10 33 57.2597163600 -01 15 07.405462944           B 5 0
18 SDSS J103418.25+481134.5 HV* 10 34 18.2559429792 +48 11 34.617506928           B 9 0
19 2QZ J104318.2-013503 HV* 10 43 18.2919467616 -01 35 02.538914460   19.53       B 8 0
20 [BGK2006] HV 12 HV* 10 50 09.5966400120 +03 15 50.619146796   20.2 19.76 19.8   sd 21 0
21 [BGK2006] HV 13 HV* 10 52 48.3065102592 -00 01 33.870967284   20.33 20.16     B 19 0
22 SDSS J110224.37+025002.8 HV* 11 02 24.3754875480 +02 50 02.872024728           A1 12 0
23 [BGK2006] HV 6 HV* 11 05 57.4506801480 +09 34 39.493679160     19.11     B 19 0
24 2QZ J111136.4+005855 HV* 11 11 36.4436777976 +00 58 56.430744600           B 10 0
25 SDSS J112255.77-094734.9 HV* 11 22 55.7776765128 -09 47 34.881305604           B 6 0
26 SDSS J113312.12+010824.8 HS* 11 33 12.1225194672 +01 08 24.841717008   17.2 17.80 17.7   sdB 35 0
27 [BGK2006] HV 15 HV* 11 33 41.0930661720 -01 21 14.317169544   19.35 19.33     B 19 0
28 SDSS J113517.76+080201.4 HV* 11 35 17.7523524840 +08 02 01.441881744           B 8 0
29 SDSS J113637.13+033106.8 HV* 11 36 37.1370991368 +03 31 06.933976356           B 9 0
30 SDSS J114146.44+044217.2 HV* 11 41 46.4442775200 +04 42 17.306056008           ~ 8 0
31 SDSS J115245.91-021116.2 HV* 11 52 45.9116957424 -02 11 16.229811912           A1 12 0
32 [BGK2006] HV 10 HV* 12 03 37.8548727096 +18 02 50.385104700     19.36     B 17 0
33 [BGK2006] HV 16 HV* 12 25 23.4044930736 +05 22 33.899852892     19.49     B 12 0
34 CSO 408 HV* 14 04 32.3843183256 +35 22 58.439941248   17       B8 15 0
35 GD 492 WD* 14 06 35.4162372480 +74 18 58.013654688   15.80 15.51 16.16   DZ 44 0
36 SDSS J141723.34+101245.7 HV* 14 17 23.3382362160 +10 12 45.697381020           A1 10 0
37 SDSS J142001.94+124404.8 HV* 14 20 01.9366078920 +12 44 04.840195092           B9 9 0
38 SDSS J144955.58+310351.4 HV* 14 49 55.5761686536 +31 03 51.382720188           A1 12 0
39 SDSS J154806.92+093423.9 HV* 15 48 06.9281797872 +09 34 23.914201548           B 6 0
40 SDSS J164156.38+472346.1 HV* 16 41 56.3885629656 +47 23 46.069950660           B 12 0
41 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
42 SDSS J180050.86+482424.6 HV* 18 00 50.8619237328 +48 24 24.601277196           B 5 0
43 SDSS J232229.47+043651.4 HV* 23 22 29.4771097896 +04 36 51.503422032           B 6 0
44 SDSS J232904.94+330011.4 HV* 23 29 04.9504064568 +33 00 11.528546652           B 8 0

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