S62 and S4711: Indications of a Population of Faint Fast-moving Stars inside the S2 Orbit—S4711 on a 7.6 yr Orbit around Sgr A
We present high-pass filtered NACO and SINFONI images of the newly discovered stars
S4711–S4715 between 2004 and 2016. Our deep H+K-band (SINFONI) and K-band …
S4711–S4715 between 2004 and 2016. Our deep H+K-band (SINFONI) and K-band …
X-ray eruptions every 22 days from the nucleus of a nearby galaxy
Galactic nuclei showing recurrent phases of activity and quiescence have recently been
discovered. Some have recurrence times as short as a few hours to a day and are known as …
discovered. Some have recurrence times as short as a few hours to a day and are known as …
Stellar transits across a magnetized accretion torus as a mechanism for plasmoid ejection
The close neighborhood of a supermassive black hole contains not only the accreting gas
and dust but also stellar-sized objects, such as late-type and early-type stars and compact …
and dust but also stellar-sized objects, such as late-type and early-type stars and compact …
Science with a small two-band UV-photometry mission III: Active Galactic Nuclei and nuclear transients
In this review, the third one in the series focused on a small two-band UV-photometry
mission, we assess possibilities for a small UV two-band photometry mission in studying …
mission, we assess possibilities for a small UV two-band photometry mission in studying …
Standardizing reverberation-measured C iv time-lag quasars, and using them with standardized Mg ii quasars to constrain cosmological parameters
We use 38 C iv quasar (QSO) reverberation-mapped observations, which span eight orders
of magnitude in luminosity and the redshift range 0.001064≤ z≤ 3.368, to simultaneously …
of magnitude in luminosity and the redshift range 0.001064≤ z≤ 3.368, to simultaneously …
Effect of extinction on quasar luminosity distances determined from UV and X-ray flux measurements
In Khadka et al., a sample of X-ray-detected reverberation-mapped quasars was presented
and applied for the comparison of cosmological constraints inferred using two well …
and applied for the comparison of cosmological constraints inferred using two well …
A binary system in the S cluster close to the supermassive black hole Sagittarius A
High-velocity stars and peculiar G objects orbit the central supermassive black hole (SMBH)
Sagittarius A*(Sgr A*). Together, the G objects and high-velocity stars constitute the S …
Sagittarius A*(Sgr A*). Together, the G objects and high-velocity stars constitute the S …
Detection of galactic center source G2 at 3.8 μm during periapse passage
G Witzel, AM Ghez, MR Morris… - The Astrophysical …, 2014 - iopscience.iop.org
We report new observations of the Galactic Center source G2 from the WM Keck
Observatory. G2 is a dusty red object associated with gas that shows tidal interactions as it …
Observatory. G2 is a dusty red object associated with gas that shows tidal interactions as it …
Detection of a drag force in G2's orbit: Measuring the density of the accretion flow onto Sgr A* at 1000 Schwarzschild radii
S Gillessen, PM Plewa, F Widmann… - The Astrophysical …, 2019 - iopscience.iop.org
Abstract The Galactic Center black hole Sgr A* is the archetypical example of an underfed
massive black hole. The extremely low accretion rate can be understood in radiatively …
massive black hole. The extremely low accretion rate can be understood in radiatively …
Effect of electromagnetic interaction on galactic center flare components
Recently, near-infrared GRAVITY@ ESO observations at 2.2 μm announced the detection of
three bright" flares" in the vicinity of the Galactic center supermassive black hole (SMBH) that …
three bright" flares" in the vicinity of the Galactic center supermassive black hole (SMBH) that …