New nearby hypervelocity stars and their spatial distribution from Gaia DR2
Base on about 4,500 large tangential velocity ($V_\mathrm{tan}>0.75V_\mathrm{esc}$) with high-precision proper motions and $5\sigma$ parallaxes in Gaia DR2 5D information derived from parallax and proper motion, we identify more than 600 high velocity stars with $50\%$ unbound probability. Of these, 28 nearby (less than 6 kpc) late-type Hypervelocity stars (HVSs) with over $99\%$ possibility of unbound are discovered. In order to search for the unbound stars from the full Gaia DR2 6D phase space information derived from parallax, proper motion and radial velocity, we also identify 28 stars from the total velocity ($V_\mathrm{gc}>0.75V_\mathrm{esc}$) that have probabilities greater than $50\%$ of being unbound from the Galaxy. Of these, only three have a nearly $99\%$ probabilities of being unbound. On the whole HVSs subsample, there is 12 sources reported by other surveys. We study the spatial distribution of angular positions and angular separation of HVSs. We find the unbound HVSs are spatially anisotropic that is most significant in the Galactic longitude at more than $3\sigma$ level, and lower unbound probability HVSs are systematically more isotropic. The spatial distribution can reflect the origin of HVSs and we discuss the possible origin link with the anisotropy.
NurtureToken New!

Token crowdsale for this paper ends in

Buy Nurture Tokens

Authors

Are you an author of this paper? Check the Twitter handle we have for you is correct.

Cuihua Du (add twitter)
Hefan Li (add twitter)
Yepeng Yan (add twitter)
Heidi Jo Newberg (edit)
Jianrong Shi (add twitter)
Jun Ma (edit)
Yuqin Chen (add twitter)
Zhenyu Wu (add twitter)
Ask The Authors

Ask the authors of this paper a question or leave a comment.

Read it. Rate it.
#1. Which part of the paper did you read?

#2. The paper contains new data or analyses that is openly accessible?
#3. The conclusion is supported by the data and analyses?
#4. The conclusion is of scientific interest?
#5. The result is likely to lead to future research?

Github
User:
None (add)
Repo:
None (add)
Stargazers:
0
Forks:
0
Open Issues:
0
Network:
0
Subscribers:
0
Language:
None
Youtube
Link:
None (add)
Views:
0
Likes:
0
Dislikes:
0
Favorites:
0
Comments:
0
Other
Sample Sizes (N=):
Inserted:
Words Total:
Words Unique:
Source:
Abstract:
None
07/15/19 06:04PM
7,933
2,766
Tweets
AsteroidEnergy: RT @Jos_de_Bruijne: "New nearby hypervelocity stars and their spatial distribution from #GaiaDR2" https://t.co/uC5QXZTkEv "We identify more…
StefanJordanARI: RT @Jos_de_Bruijne: "New nearby hypervelocity stars and their spatial distribution from #GaiaDR2" https://t.co/uC5QXZTkEv "We identify more…
astropierre: RT @Jos_de_Bruijne: "New nearby hypervelocity stars and their spatial distribution from #GaiaDR2" https://t.co/uC5QXZTkEv "We identify more…
AdrienCoffinet: RT @Jos_de_Bruijne: "New nearby hypervelocity stars and their spatial distribution from #GaiaDR2" https://t.co/uC5QXZTkEv "We identify more…
Jos_de_Bruijne: "New nearby hypervelocity stars and their spatial distribution from #GaiaDR2" https://t.co/uC5QXZTkEv "We identify more than 600 high velocity stars with 50% unbound probability" #GaiaMission https://t.co/6bDmrIMTBj
Images
Related