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Related papers: The Flux Distribution of Sgr A*

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Daily X-ray flaring represents an enigmatic phenomenon of Sgr A$^{\star}$ --- the supermassive black hole at the center of our Galaxy. We report initial results from a systematic X-ray study of this phenomenon, based on extensive {\it…

High Energy Astrophysical Phenomena · Physics 2015-12-29 Qiang Yuan , Q. Daniel Wang

The Galactic Center was observed at 8.6 mum in order to detect a mid-infrared (MIR) counterpart of Sgr A*, parallel to NIR observations. The goal was to set constraints on possible emission mechanisms.Imaging data were acquired with the…

Astrophysics · Physics 2007-05-23 R. Schoedel , A. Eckart , K. Muzic , L. Meyer , T. Viehmann , G. C. Bower

(Abridged) Sgr A$^\star$ is the electromagnetic counterpart of the accreting supermassive black hole in the Galactic center. Its emission is variable in the near-infrared (NIR) and X-ray wavelengths on short timescales. The physical origin…

High Energy Astrophysical Phenomena · Physics 2024-10-15 Maria Petropoulou , Gabriele Ponti , Giovanni Stel , Apostolos Mastichiadis

Sagittarius~A$^*$, the supermassive black hole at the center of our galaxy, exhibits flares across various wavelengths, yet their origins remain elusive. We performed 3D two-temperature General Relativistic Magnetohydrodynamic (GRMHD)…

High Energy Astrophysical Phenomena · Physics 2025-07-18 Hong-Xuan Jiang , Yosuke Mizuno , Indu K. Dihingia , Feng Yuan , Xi Lin , Christian M. Fromm , Antonios Nathanail , Ziri Younsi

We report the first detection of the Galactic Centre massive black hole, Sgr~A*, in the far infrared. Our measurements were obtained with PACS on board the \emph{Herschel} satellite at $100~\mathrm{\mu m}$ and $160~\mathrm{\mu m}$. While…

Energetic flares are observed in the Galactic supermassive black hole Sagittarius A* from radio to X-ray wavelengths. On a few occasions, simultaneous flares have been detected in IR and X-ray observations, but clear counterparts at longer…

Variable emission from Sgr~A*, the luminous counterpart to the super-massive black hole at the center of our Galaxy, arises from the innermost portions of the accretion flow. Better characterization of the variability is important for…

High Energy Astrophysical Phenomena · Physics 2016-07-06 Jordan M. Stone , D. P. Marrone , C. D. Dowell , B. Schulz , C. O. Heinke , F. Yusef-Zadeh

The Galaxy's supermassive black hole, Sgr A*, produces an outburst of infrared radiation about once every 6 hours, sometimes accompanied by an even more energetic flurry of X-rays. The NIR photons are produced by nonthermal synchrotron…

Astrophysics of Galaxies · Physics 2018-09-26 Fulvio Melia , Maurizio Falanga , Andrea Goldwurm

The radiative counterpart of the supermassive black hole at the Galactic center (GC), Sgr A*, is subject to frequent flares visible simultaneously in X-rays and near-infrared (NIR). Often, enhanced radio variability from centimeter to…

Observations of Sagittarius A* (Sgr A*) in near-infrared (NIR) show irregular flaring activity. Flares coincide with astrometric rotation of brightness centroid and with looping patterns in fractional linear polarization. These signatures…

High Energy Astrophysical Phenomena · Physics 2024-11-27 A. I. Yfantis , M. Wielgus , M. A. Mościbrodzka

The super-massive 4 million solar mass black hole (SMBH) SgrA* shows flare emission from the millimeter to the X-ray domain. The nucleus of the Milky Way has properties (stellar cluster, young stars, molecular gas and an accreting SMBH)…

Sagittarius A$^*$ in the Galactic center harbors a supermassive black hole and exhibits various active phenomena. Besides quiescent emission in radio and submillimeter radiation, flares in the near infrared (NIR) and X-ray bands are…

High Energy Astrophysical Phenomena · Physics 2015-05-20 Masaaki Kusunose , Fumio Takahara

We present a new way of describing the flares from Sgr A* with a self-consistent calculation of the particle distribution. All relevant radiative processes are taken into account in the evolution of the electron distribution and resulting…

High Energy Astrophysical Phenomena · Physics 2015-04-15 Salome Dibi , Sera Markoff , Renaud Belmont , Julien Malzac , Nicolas M. Barriere , John A. Tomsick

Sagittarius A* (Sgr A*) -- the supermassive black hole (SMBH) in the center of our galaxy -- has been observed in most of the electromagnetic spectrum, from radio to X-rays. Diffuse gamma-ray emission has been observed around Sgr A* and a…

High Energy Astrophysical Phenomena · Physics 2021-09-08 Fabio Cafardo , Rodrigo Nemmen

The Galactic Center is the closest galactic nucleus that allows us to determine the multi-frequency behavior of the supermassive black hole counterpart Sagittarius A* in great detail. We put SgrA*, as a nucleus with weak activity, into the…

Sagittarius A* (Sgr A*) is the variable radio, near-infrared (NIR), and X-ray source associated with accretion onto the Galactic center black hole. We present an analysis of the most comprehensive NIR variability dataset of Sgr A* to date:…

Information about the X-ray luminosity of the supermassive black hole located at the Galactic center (GC), Sgr A*, and its temporal variations in the past is imprinted in the scattered emission observed today in the direction towards giant…

Astrophysics · Physics 2009-11-07 Conrad K. Cramphorn , Rashid A. Sunyaev

Radio and mm-wavelength observations of Sagittarius A* (Sgr A*), the radio source associated with the supermassive black hole at the center of our Galaxy, show that it behaves as a partially self-absorbed synchrotron-emitting source. The…

High-resolution, multi-wavelength, and time-domain observations of the Galactic centre black hole candidate, Sgr A*, allow for a direct test of contemporary accretion theory. To date, all models have assumed alignment between the accretion…

High Energy Astrophysical Phenomena · Physics 2015-06-04 Jason Dexter , P. Chris Fragile

In recent years, near-IR and X-ray flares have been detected from the Galaxy's central radio point source, Sagittarius A* (Sgr A*), believed to be a \~3.10^6 solar masses supermassive black hole. In some cases, the transient emission…

Astrophysics · Physics 2009-11-13 Michel Tagger , Fulvio Melia