2019A&A...627A.104D


Query : 2019A&A...627A.104D

2019A&A...627A.104D - Astronomy and Astrophysics, volume 627A, 104-104 (2019/7-1)

Flying far and fast: the distribution of distant hypervelocity star candidates from Gaia DR2 data.

DE LA FUENTE MARCOS R. and DE LA FUENTE MARCOS C.

Abstract (from CDS):

Context. Hypervelocity stars move fast enough to leave the gravitational field of their home galaxies and venture into intergalactic space. The most extreme examples known have estimated speeds in excess of 1000km/s. These can be easily induced at the centres of galaxies via close encounters between binary stars and supermassive black holes; however, a number of other mechanisms operating elsewhere can produce them as well. Aims. Recent studies suggest that hypervelocity stars are ubiquitous in the local Universe. In the Milky Way, the known hypervelocity stars are anisotropically distributed, but it is unclear why. Here, we used Gaia Data Release 2 (DR2) data to perform a systematic exploration aimed at confirming or refuting these findings. Methods. Our basic premise is that the farther the candidate hypervelocity stars are, the more likely they are to be unbound from the Galaxy. We used the statistical analysis of both the spatial distribution and kinematics of these objects to achieve our goals. Monte Carlo sampling techniques were applied to deal with large uncertainties. No global parallax zero-point correction was performed. Results. Focussing on nominal Galactocentric distances greater than 30kpc, which are the most distant candidates, we isolated a sample with speeds in excess of 500km/s that exhibits a certain degree of anisotropy but remains compatible with possible systematic effects. We find that the effect of the Eddington-Trumpler-Weaver bias is important in our case: over 80% of our sources are probably located further away than implied by their parallaxes; therefore, most of our velocity estimates are lower limits. If this bias is as strong as suggested here, the contamination by disc stars may not significantly affect our overall conclusions. Conclusions. The subsample with the lowest uncertainties shows stronger, but obviously systematic, anisotropies and includes a number of candidates of possible extragalactic origin and young age with speeds of up to 2000km/s.

Abstract Copyright: © ESO 2019

Journal keyword(s): methods: statistical - Galaxy: disk - celestial mechanics - stars: kinematics and dynamics - Galaxy: structure - Galaxy: halo

Simbad objects: 52

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Number of rows : 52
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10372 1
2 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 6414 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 16254 1
4 NAME Gal Anticenter reg 05 46 +28.9           ~ 826 0
5 Gaia DR3 5531793499296526336 HV* 07 45 21.3271757808 -44 53 26.680223904           ~ 1 0
6 Gaia DR3 5489467833544327040 HV* 07 50 32.5347587400 -53 24 01.355533704           ~ 1 0
7 Gaia DR3 5317776481532378240 HV* 08 41 58.7829550680 -54 47 47.935607784           ~ 1 0
8 Gaia DR3 5641968206535885696 HV* 08 42 05.3714559864 -30 44 07.576622556           ~ 1 0
9 Gaia DR3 5317229302706969088 HV* 08 55 17.7643439880 -54 33 36.479035548           ~ 1 0
10 Gaia DR3 5303914835370054656 HV* 09 03 31.2242729160 -57 26 01.854584232           ~ 1 0
11 [BGK2006] HV 1 HV* 09 07 44.9922286848 +02 45 06.878226600     19.84     B 43 0
12 Gaia DR3 5304019117178317312 HV* 09 10 44.6424033240 -56 44 10.305373344           ~ 1 0
13 LAMOST-HVS1 Em* 09 12 06.5238309096 +09 16 21.890911908   12.96 13.06     B1IV/V 17 0
14 Gaia DR3 5252768161477321472 HV* 10 07 14.9120336832 -63 04 19.510733100           ~ 1 0
15 Gaia DR3 5365388599188363648 HV* 10 23 19.0341292152 -47 29 29.332732560           ~ 1 0
16 ATO J167.4740-01.7840 HV* 11 09 53.7801006408 -01 47 02.366237760           ~ 2 0
17 Gaia DR3 5348384273914768000 HV* 11 18 55.5438760104 -52 54 19.945425708           ~ 1 0
18 Gaia DR3 5370493837834558976 HV* 11 34 54.8130021624 -48 52 33.819600252           ~ 1 0
19 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6318 0
20 [SRB2011] H70848 GlC 12 30 54.6875708736 +12 40 58.601157276           ~ 6 0
21 NAME NGP reg 12 51 26.275 +27 07 41.70           ~ 1114 0
22 Gaia DR3 5846959127210423424 HV* 14 00 03.1296241896 -69 49 40.902070116           ~ 1 0
23 Gaia DR3 1696697285206197248 HV* 15 46 52.7183415624 +73 13 49.664331912           ~ 1 0
24 NAME Nor Arm PoG 16 00 -50.0           ~ 388 0
25 Gaia DR3 1383279090527227264 HV* 16 01 20.9988781536 +41 10 00.536406384           ~ 5 0
26 Gaia DR3 5932173855446728064 HV* 16 16 28.3488053376 -54 26 25.550729196           ~ 7 0
27 Gaia DR3 1409724578557941248 HV* 16 23 51.5846791392 +45 51 19.813029516           ~ 1 0
28 Gaia DR3 1331376987735140864 HV* 16 35 29.4731165760 +37 12 37.925299188           ~ 1 0
29 Gaia DR3 4326973843264734208 HV* 16 35 34.1727708888 -14 31 05.841457968           ~ 3 0
30 Gaia DR3 1314483506970781824 HV* 16 47 12.0170881416 +34 05 25.674107316           ~ 1 0
31 Gaia DR3 1635042132022938752 HV* 16 47 39.0402314112 +64 59 50.554492800           ~ 1 0
32 Gaia DR3 1438071495854426880 HV* 16 52 32.2034139720 +60 07 21.037136412           ~ 1 0
33 Gaia DR3 1353387698695201792 HV* 17 04 56.3073557616 +39 28 41.054548548           ~ 1 0
34 Gaia DR3 4395399303719163904 HV* 17 15 00.0322561488 +08 43 53.134489236           ~ 1 0
35 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2006 0
36 Cl* NGC 6341 BARN 73 HV* 17 17 08.3187943320 +43 09 35.781551136   13.71 12.51     ~ 5 0
37 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13189 0
38 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3953 3
39 Gaia DR3 1417386319177949824 HV* 17 52 34.1124088920 +54 38 06.984994380           ~ 1 0
40 Gaia DR3 2040146269183375232 HV* 18 56 59.9974547832 +27 40 06.426065856           ~ 1 0
41 Gaia DR3 2130229806599268480 HV* 19 11 07.9021580664 +45 29 47.577322212           ~ 1 0
42 Gaia DR3 2255126837089768192 HV* 19 11 17.6291189112 +67 10 01.640310492           ~ 1 0
43 Gaia DR3 2101802964257385984 HV* 19 22 14.4914819736 +41 36 30.228819120           ~ 1 0
44 Gaia DR3 2045060021021275776 HV* 19 30 05.2553522352 +31 32 36.266046072           ~ 1 0
45 Gaia DR3 2076234920873478272 HV* 19 39 48.0559164360 +39 16 02.767381536           ~ 1 0
46 2MASS J19411869+4502298 HV* 19 41 18.6949733760 +45 02 29.859239544           K5II 2 0
47 Gaia DR3 2186552770772130048 HV* 20 31 03.2614855824 +55 03 42.491341260           ~ 1 0
48 Gaia DR3 6456587609813249536 HV* 21 09 26.5889148552 -57 54 44.357760756           ~ 3 0
49 Gaia DR3 1867261981412622976 HV* 21 10 00.6841443048 +35 03 47.621357244           ~ 1 0
50 LAMOST-HVS4 HV* 22 58 37.5583345464 +40 00 05.413913136           ~ 6 0
51 NAME Galactic Bulge reg ~ ~           ~ 3928 0
52 NAME Local Group GrG ~ ~           ~ 7769 0

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2022.09.28-14:01:46

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