Journal
ASTROPHYSICAL JOURNAL
Volume 899, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/ab9c1c
Keywords
B stars; Galactic center; Black holes; Relativistic stars; the Milky Way
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG) via the Cologne Bonn Graduate School (BCGS)
- Max Planck Society through the International Max Planck Research School (IMPRS) for Astronomy and Astrophysics
- University of Cologne
- Deutsche Forschungsgemeinschaft (DFG) [184018867]
- National Science Centre, Poland [2017/26/A/ST9/00756 (Maestro 9)]
- [SFB 956]
Ask authors/readers for more resources
We present high-pass filtered NACO and SINFONI images of the newly discovered stars S4711-S4715 between 2004 and 2016. Our deepH+K-band (SINFONI) andK-band (NACO) data show the S-cluster star S4711 on a highly eccentric trajectory around Sgr A* with an orbital period of 7.6 yr and a periapse distance of 144 au to the supermassive black hole (SMBH). S4711 is hereby the star with the shortest orbital period and the smallest mean distance to the SMBH during its orbit to date. The used high-pass filtered images are based on coadded data sets to improve the signal to noise. The spectroscopic SINFONI data let us determine detailed stellar properties of S4711 like the mass and the rotational velocity. The faint S-cluster star candidates, S4712-S4715, can be observed in a projected distance to Sgr A* of at least temporarily <= 120 mas. From these stars, S4714 is the most prominent, with an orbital period of 12 yr and an eccentricity of 0.985. The stars S4712-S4715 show similar properties, with magnitudes and stellar masses comparable to those of S4711. The MCMC simulations determine confidently precise uncertainties for the orbital elements of S62 and S4711-S4715. The presence of S4711 in addition to S55, S62, and the also newly found star S4714 implies a population of faint stars that can be found at distances to Sgr A* that are comparable to the size of our solar system. These short orbital time period stars in the dense cluster around the SMBH in the center of our Galaxy are perfect candidates to observe gravitational effects such as the periapse shift.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available