Revisiting pulsar velocities using Gaia Data Release 2  

作　　者：Meng Yang Shi Dai Di Li Chao-Wei Tsai Wei-Wei Zhu Jie Zhang 

机构地区：[1]China West Normal University,Nanchong 637000,China [2]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China [3]School of Science,Western Sydney University,Locked Bag 1797,Penrith NSW 2751,Australia [4]CSIRO Astronomy and Space Science,Australia Telescope National Facility,PO Box 76,Epping,NSW 1710,Australia [5]University of Chinese Academy of Sciences,Beijing 100049,China [6]NAOC-UKZN Computational Astrophysics Centre,University of KwaZulu-Natal,Durban 4000,South Africa [7]Qilu Normal University,Zhangqiu 250200,China

出　　处：《Research in Astronomy and Astrophysics》2021年第6期294-300,共7页天文和天体物理学研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.11988101,11725313 and U2031121);Funding for the DPAC has been provided by national institutions,in particular the institutions participating in the Gaia Multilateral Agreement;S.D.is the recipient of an Australian Research Council Discovery Early Career Award(DE210101738)funded by the Australian Government。

摘　　要：Precise measurements of neutron star(NS)velocities provide critical clues in regard to the supernova physics and evolution of binary systems.Based on Gaia Data Release 2(DR2),we selected a sample of 24 young(<3 Myr)pulsars with precise parallax measurements and measured the velocity of their local standard of rest(LSR)and the velocity dispersion among their respective local stellar groups.The median velocity difference between thus calculated LSRs and the Galactic rotation model is~7.6 km s^(-1),small compared to the typical velocity dispersion of~27.5 km s^(-1).For pulsars off the Galactic plane,such differences grow significantly to as large as~40 km s^(-1).More importantly,the velocity dispersion of stars in the local group of low-velocity pulsars can be comparable to their transverse velocities,suggesting that the intrinsic velocities of NS progenitors should be taken into account when we consider their natal kicks and binary evolution.We also examined the double NS system J0737-3039 A/B,and measured its transverse velocity to be 26-13+18 km s^(-1)assuming nearby Gaia sources are representative of their birth environment.This work demonstrated the feasibility and importance of using Gaia data to study the velocity of individual systems and velocity distribution of NSs.

关 键 词：(stars:) pulsars:general 

分 类 号：P145.6[天文地球—天体物理]