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Astrophysics > Astrophysics of Galaxies

arXiv:2207.02142 (astro-ph)
[Submitted on 5 Jul 2022]

Title:Observation of S4716 -- a Star with a 4 yr Orbit around Sgr A*

Authors:Florian Peissker, Andreas Eckart, Michal Zajacek, Silke
Britzen
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    Abstract: The ongoing monitoring of the Galactic center and Sgr
    A*, the central supermassive black hole, produces surprising and
    unexpected findings. This goes hand in hand with the technical
    evolution of ground- and space-based telescopes and instruments,
    but also with the progression of image filter techniques such as
    the Lucy Richardson algorithm. As we continue to trace the
    members of the S cluster close to Sgr A* on their expected
    trajectory around the supermassive black hole, we present the
    finding of a new stellar source, which we call S4716. The newly
    found star orbits SgrA* in about 4.0 yr and can be detected with
    NIRC2 (Keck), OSIRIS (Keck), SINFONI (VLT), NACO (VLT), and
    GRAVITY (VLTI). With a periapse distance of about 100 au, S4716
    shows an equivalent distance toward Sgr A* as S4711. These
    fast-moving stars undergo a similar dynamical evolution, since
    S4711-S4716 share comparable orbital properties. We will
    furthermore draw a connection between the recent finding of a new
    faint star called S300 and the data presented here. Additionally,
    we observed a blend-star event with S4716 and another newly
    identified S star S148 in 2017.

Comments: 33 pages, 23 figures, published at ApJ
Subjects: Astrophysics of Galaxies (astro-ph.GA); Solar and Stellar
          Astrophysics (astro-ph.SR)
Cite as:  arXiv:2207.02142 [astro-ph.GA]
          (or arXiv:2207.02142v1 [astro-ph.GA] for this version)
          https://doi.org/10.48550/arXiv.2207.02142
          Focus to learn more
          arXiv-issued DOI via DataCite
Related   https://doi.org/10.3847/1538-4357/ac752f
DOI:      Focus to learn more
          DOI(s) linking to related resources

Submission history

From: Florian Peissker [view email]
[v1] Tue, 5 Jul 2022 16:06:54 UTC (11,991 KB)
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