The Fate of Former Companions to Hypervelocity Stars Originating at the Galactic Center
نویسندگان
چکیده
The hypervelocity star SDSS J090745.0+024507 in the halo of the Milky Way galaxy (Brown et al. 2005) most likely originated from the breakup of a binary star system by the central black hole, SgrA* (Hills 1988). We examine the fate of former binary companions to similar hypervelocity stars (HVSs) by simulating 600 different binary orbits around SgrA* with a direct N-body integration code. For some orbital parameters, the binary breakup process leads to HVSs with ejection velocities that are almost an order of magnitude larger than the velocity observed for SDSS J090745.0+024507.The former companion stars populate highly eccentric orbits which resemble the observed orbits for some of the stars nearest to SgrA*.
منابع مشابه
Hypervelocity Stars and the Galactic Center
In 2005 we reported the discovery of the first HVS: a 3 M⊙ main sequence star traveling with a Galactic rest frame velocity of at least +709 ± 12 km s, more than twice the Milky Way’s escape velocity at the star’s distance of 110 kpc (Brown et al. 2005). This star cannot be explained by normal stellar interactions: the maximum ejection velocity from binary disruption mechanisms (Blaauw 1961; Po...
متن کاملRunaway and Hypervelocity Stars in the Galactic Halo: Binary Rejuvenation and Triple Disruption
Young stars observed in the distant Galactic halo are usually thought to have formed elsewhere, either in the Galactic disk or perhaps the Galactic center, and subsequently ejected at high velocities to their current position. However, some of these stars have apparent lifetimes shorter the required flight time from the Galactic disk/center. We suggest that such stars have evolved in close runa...
متن کاملThe effect of variation of stellar dispersion velocities by the galactic latitude in interpreting gravitational microlensing observations
Our galaxy is a spiral galaxy and its stars are mostly in a thin disk and rotate around the galactic center. The vertical component of the dispersion velocity of stars is a function of the galactic latitude and decreases with increasing it. In the galactic Besancon model, this dependence is ignored and they just consider the dependence of dispersion velocity on the stellar age. Becanson model i...
متن کاملSearch for Hypervelocity Stars One Parsec from the Galactic Center Ucla Physics & Astronomy Reu 2008
The first hypervelocity stars, bodies with radial velocities greater than the escape speed of the Milky Way, have previously been observed only in the halo of our Galaxy. However, they are thought to originate near the Galactic center. We present the most extensive search to date for hypervelocity stars in this region. Our images were taken over a one year baseline with the W. M. Keck II 10 m t...
متن کاملA Successful Targeted Search for Hypervelocity Stars
Hypervelocity stars (HVSs) travel with velocities so extreme that dynamical ejection from a massive black hole is their only suggested origin. Following the discovery of the first HVS by Brown and collaborators, we have undertaken a dedicated survey for more HVSs in the Galactic halo and present here the resulting discovery of two new HVSs: SDSS J091301.0+305120 and SDSS J091759.5+672238, trave...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2008