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• W4377967939 abstract "Abstract The feeding and feedback processes at the vicinity of a supermassive black hole (BH) are essential for our understanding of the connection between supermassive BH and its host galaxy. In this work, we provide a detailed investigation, both observational and theoretical, on the diffuse (∼2″–20″, ∼0.08–0.8 pc) X-ray emission around Sgr A*. Over two-decade Chandra observations are gathered to obtain highest signal-to-noise to date. We find that, the line center of iron lines of the outer 8″–18″ region, <?CDATA ${epsilon }_{{rm{c}}}={6.65}_{-0.03}^{+0.02},mathrm{keV}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mrow> <mml:mi>ϵ</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>c</mml:mi> </mml:mrow> </mml:msub> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mrow> <mml:mn>6.65</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.03</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.02</mml:mn> </mml:mrow> </mml:msubsup> <mml:mspace width=0.25em /> <mml:mi>keV</mml:mi> </mml:math> , is comparable to that ( <?CDATA ${epsilon }_{{rm{c}}}={6.60}_{-0.03}^{+0.05},mathrm{keV}$?> <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML overflow=scroll> <mml:msub> <mml:mrow> <mml:mi>ϵ</mml:mi> </mml:mrow> <mml:mrow> <mml:mi mathvariant=normal>c</mml:mi> </mml:mrow> </mml:msub> <mml:mo>=</mml:mo> <mml:msubsup> <mml:mrow> <mml:mn>6.60</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>0.03</mml:mn> </mml:mrow> <mml:mrow> <mml:mo>+</mml:mo> <mml:mn>0.05</mml:mn> </mml:mrow> </mml:msubsup> <mml:mspace width=0.25em /> <mml:mi>keV</mml:mi> </mml:math> ) of the inner 2″–5″ region. This is somewhat unexpected, since the gas temperature decreases further away from the central BH. Based on a dynamical inflow–outflow model that considers the gas feeding by stellar winds from Wolf–Rayet stars, we calculate the X-ray spectrum based on both the conventional collisional ionization equilibrium (CIE) assumption, and the newly developed non-equilibrium ionization (NEI) assumption. We find that, theoretically gases within ∼8″–10″ remain in a CIE state, outside of this radius they will be in the NEI state. A comparison of the properties of ∼6.6 keV iron lines between CIE and NEI is addressed. Interestingly, the NEI interpretation of outer region is supported by the Chandra line center ϵ c measurements of this region." @default.
• W4377967939 created "2023-05-25" @default.
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• W4377967939 date "2023-07-05" @default.
• W4377967939 modified "2023-09-30" @default.
• W4377967939 title "Does Diffuse Circumnuclear Gas around Sgr A* Achieve Collisional Ionization Equilibrium or Remain Non-equilibrium Ionization?" @default.
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• W4377967939 doi "https://doi.org/10.1088/1674-4527/acd89f" @default.
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