THE INTRINSIC SHAPE OF SAGITTARIUS A* AT 3.5mm WAVELENGTH
文献类型：期刊论文
| 作者 | Ortiz-Leon, Gisela N.2; Johnson, Michael D.3; Doeleman, Sheperd S.3,4; Blackburn, Lindy3; Fish, Vincent L.4; Loinard, Laurent2,5; Reid, Mark J.3; Castillo, Edgar6; Chael, Andrew A.3; Hernandez-Gomez, Antonio2 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2016-06-10 |
| 卷号 | 824期号:1 |
| 关键词 | Accretion, Accretion Disks Galaxies: Active A*GA*A*lA*A*xA*iA*eA*sA*:A* A*IA*nA*dA*iA*vA*iA*dA*uA*A*lA* A*(A*SA*gA*rA* A*A**A*)A* Galaxy: Center Techniques: Interferometric |
| ISSN号 | 0004-637X |
| DOI | 10.3847/0004-637X/824/1/40 |
| 英文摘要 | The radio emission from Sgr A* is thought to be powered by accretion onto a supermassive black hole of similar to 4 x 10(6) M-circle dot at the Galactic Center. At millimeter wavelengths, Very Long Baseline Interferometry (VLBI) observations can directly resolve the bright innermost accretion region of Sgr A*. Motivated by the addition of many sensitive long baselines in the north-south direction, we developed a full VLBI capability at the Large Millimeter Telescope Alfonso Serrano (LMT). We successfully detected Sgr A* at 3.5 mm with an array consisting of six Very Long Baseline Array telescopes and the LMT. We model the source as an elliptical Gaussian brightness distribution and estimate the scattered size and orientation of the source from closure amplitude and self-calibration analysis, obtaining consistent results between methods and epochs. We then use the known scattering kernel to determine the intrinsic two-dimensional source size at 3.5 mm: (147 +/- 7 mu as) x (120 +/- 12 mu as), at position angle 88 degrees +/- 7 degrees east of north. Finally, we detect non-zero closure phases on some baseline triangles, but we show that these are consistent with being introduced by refractive scattering in the interstellar medium and do not require intrinsic source asymmetry to explain. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000377937300040 |
| 出版者 | IOP PUBLISHING LTD |
| 源URL | [http://119.78.226.72/handle/331011/32791]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Ortiz-Leon, Gisela N. |
| 作者单位 | 1.Univ Massachusetts, Dept Astron, Amherst, MA 01002 USA 2.Univ Nacl Autonoma Mexico, Inst Radioastron & Astrofis, Morelia 58089, Michoacan, Mexico 3.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA 4.MIT, Haystack Observ, Route 40, Westford, MA 01886 USA 5.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany 6.Inst Nacl Astrofis Opt & Electr, Apartado Postal 51 & 216, Puebla 72000, Mexico 7.Univ Ghent, Sterrenkundig Observ, Krijgslaan 281-S9, B-9000 Ghent, Belgium 8.Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ortiz-Leon, Gisela N.,Johnson, Michael D.,Doeleman, Sheperd S.,et al. THE INTRINSIC SHAPE OF SAGITTARIUS A* AT 3.5mm WAVELENGTH[J]. ASTROPHYSICAL JOURNAL,2016,824(1). |
| APA | Ortiz-Leon, Gisela N..,Johnson, Michael D..,Doeleman, Sheperd S..,Blackburn, Lindy.,Fish, Vincent L..,...&Vertatschitsch, Laura.(2016).THE INTRINSIC SHAPE OF SAGITTARIUS A* AT 3.5mm WAVELENGTH.ASTROPHYSICAL JOURNAL,824(1). |
| MLA | Ortiz-Leon, Gisela N.,et al."THE INTRINSIC SHAPE OF SAGITTARIUS A* AT 3.5mm WAVELENGTH".ASTROPHYSICAL JOURNAL 824.1(2016). |
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来源：上海天文台
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