INFLOW-OUTFLOW MODEL WITH CONDUCTION AND SELF-CONSISTENT FEEDING FOR Sgr A*
We propose a two-temperature radial inflow-outflow model near Sgr A* with self-consistent feeding and conduction. Stellar winds from individual stars are considered to find the rates of mass injection and energy injection. These source terms help to partially eliminate the boundary conditions on the...
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2015
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| Online Access: | http://hdl.handle.net/1721.1/95677 |
| _version_ | 1826205110041051136 |
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| author | Shcherbakov, Roman V. Baganoff, Frederick K |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Shcherbakov, Roman V. Baganoff, Frederick K |
| author_sort | Shcherbakov, Roman V. |
| collection | MIT |
| description | We propose a two-temperature radial inflow-outflow model near Sgr A* with self-consistent feeding and conduction. Stellar winds from individual stars are considered to find the rates of mass injection and energy injection. These source terms help to partially eliminate the boundary conditions on the inflow. Electron thermal conduction is crucial for inhibiting the accretion. Energy diffuses out from several gravitational radii, unbinding more gas at several arcseconds and limiting the accretion rate to <1% of Bondi rate. We successfully fit the X-ray surface brightness profile found from the extensive Chandra observations and reveal the X-ray point source in the center. The super-resolution technique allows us to infer the presence and estimate the unabsorbed luminosity L ≈ 4 × 10[superscript 32] erg s[superscript -1] of the point source. The employed relativistic heat capacity and direct heating of electrons naturally lead to low electron temperature T[subscript e] ≈ 4 × 10[superscript 10] K near the black hole. Within the same model, we fit 86 GHz optically thick emission and obtain the order of magnitude agreement of Faraday rotation measure, thus achieving a single accretion model suitable at all radii. |
| first_indexed | 2024-09-23T13:07:11Z |
| format | Article |
| id | mit-1721.1/95677 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T13:07:11Z |
| publishDate | 2015 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/956772022-10-01T13:09:56Z INFLOW-OUTFLOW MODEL WITH CONDUCTION AND SELF-CONSISTENT FEEDING FOR Sgr A* Shcherbakov, Roman V. Baganoff, Frederick K MIT Kavli Institute for Astrophysics and Space Research Baganoff, Frederick K. We propose a two-temperature radial inflow-outflow model near Sgr A* with self-consistent feeding and conduction. Stellar winds from individual stars are considered to find the rates of mass injection and energy injection. These source terms help to partially eliminate the boundary conditions on the inflow. Electron thermal conduction is crucial for inhibiting the accretion. Energy diffuses out from several gravitational radii, unbinding more gas at several arcseconds and limiting the accretion rate to <1% of Bondi rate. We successfully fit the X-ray surface brightness profile found from the extensive Chandra observations and reveal the X-ray point source in the center. The super-resolution technique allows us to infer the presence and estimate the unabsorbed luminosity L ≈ 4 × 10[superscript 32] erg s[superscript -1] of the point source. The employed relativistic heat capacity and direct heating of electrons naturally lead to low electron temperature T[subscript e] ≈ 4 × 10[superscript 10] K near the black hole. Within the same model, we fit 86 GHz optically thick emission and obtain the order of magnitude agreement of Faraday rotation measure, thus achieving a single accretion model suitable at all radii. United States. National Aeronautics and Space Administration (Grant NNX08AX04H) United States. National Aeronautics and Space Administration (Grant NNX08AH32G) United States. National Aeronautics and Space Administration (Chandra Award GO9-0101X) Smithsonian Astrophysical Observatory (Award 2834-MIT-SAO-4018) National Science Foundation (U.S.) (Grant AST-0805832) 2015-02-26T19:23:09Z 2015-02-26T19:23:09Z 2010-05 2009-12 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/95677 Shcherbakov, Roman V., and Frederick K. Baganoff. “INFLOW-OUTFLOW MODEL WITH CONDUCTION AND SELF-CONSISTENT FEEDING FOR Sgr A*.” The Astrophysical Journal 716, no. 1 (May 19, 2010): 504–509. © 2010 The American Astronomical Society en_US http://dx.doi.org/10.1088/0004-637x/716/1/504 Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing American Astronomical Society |
| spellingShingle | Shcherbakov, Roman V. Baganoff, Frederick K INFLOW-OUTFLOW MODEL WITH CONDUCTION AND SELF-CONSISTENT FEEDING FOR Sgr A* |
| title | INFLOW-OUTFLOW MODEL WITH CONDUCTION AND SELF-CONSISTENT FEEDING FOR Sgr A* |
| title_full | INFLOW-OUTFLOW MODEL WITH CONDUCTION AND SELF-CONSISTENT FEEDING FOR Sgr A* |
| title_fullStr | INFLOW-OUTFLOW MODEL WITH CONDUCTION AND SELF-CONSISTENT FEEDING FOR Sgr A* |
| title_full_unstemmed | INFLOW-OUTFLOW MODEL WITH CONDUCTION AND SELF-CONSISTENT FEEDING FOR Sgr A* |
| title_short | INFLOW-OUTFLOW MODEL WITH CONDUCTION AND SELF-CONSISTENT FEEDING FOR Sgr A* |
| title_sort | inflow outflow model with conduction and self consistent feeding for sgr a |
| url | http://hdl.handle.net/1721.1/95677 |
| work_keys_str_mv | AT shcherbakovromanv inflowoutflowmodelwithconductionandselfconsistentfeedingforsgra AT baganofffrederickk inflowoutflowmodelwithconductionandselfconsistentfeedingforsgra |