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Dissecting X-ray-emitting Gas around the Center of our Galaxy

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arxiv 1307.5845 v2 pith:6AFKIROU submitted 2013-07-22 astro-ph.HE

Dissecting X-ray-emitting Gas around the Center of our Galaxy

Q. D. Wang , M. A. Nowak , S. B. Markoff , F. K. Baganoff , S. Nayakshin , F. Yuan , J. Cuadra , J. Davis
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J. Dexter A. C. Fabian N. Grosso D. Haggard J. Houck L. Ji Z. Li J. Neilsen D. Porquet F. Ripple R. V. Shcherbakov
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keywords emissiongalaxyaccretionkalphasmbhstarsx-rayaccreting
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Most supermassive black holes (SMBHs) are accreting at very low levels and are difficult to distinguish from the galaxy centers where they reside. Our own Galaxy's SMBH provides a uniquely instructive exception, and we present a close-up view of its quiescent X-ray emission based on 3 mega-second of Chandra observations. Although the X-ray emission is elongated and aligns well with a surrounding disk of massive stars, we can rule out a concentration of low-mass coronally active stars as the origin of the emission based on the lack of predicted Fe Kalpha emission. The extremely weak H-like Fe Kalpha line further suggests the presence of an outflow from the accretion flow onto the SMBH. These results provide important constraints for models of the prevalent radiatively inefficient accretion state.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Outflow Behavior from the Transonic Advective Disks: A Hydrodynamical Simulation Study

    astro-ph.HE 2026-07 conditional novelty 5.0

    In 2D hydro simulations, colder transonic accretion disks launch faster, lower-density, more energetic bipolar outflows than hotter disks, and outflow strength rises with viscosity.

  2. Simulations of interaction between outflow and surrounding broken power-law circumnuclear medium: implications for different radio light curves of TDEs

    astro-ph.HE 2026-06 unverdicted novelty 5.0

    3D hydro simulations show that TDE outflow interactions with a broken power-law CNM can reproduce the range of observed radio light curves via early flares inside the Bondi radius and possible late rebrightenings outside it.

  3. Outflow Behavior from the Transonic Advective Disks: A Hydrodynamical Simulation Study

    astro-ph.HE 2026-07 conditional novelty 4.0

    In viscous hydro simulations, colder transonic advective disks drive faster, higher kinetic-energy and momentum bipolar outflows than hotter disks, and outflow strength increases with viscosity.