Intrinsic Size and Shape of Sgr A*: 3.6 AU by <1 AU
| dc.creator | Lo, K. Y. | |
| dc.creator | Shen, Z. -Q. | |
| dc.creator | Zhao, J. -H. | |
| dc.creator | Ho, Paul~T. P. | |
| dc.date | 1998-11-24 | |
| dc.date.accessioned | 2026-07-07T02:29:15Z | |
| dc.date.available | 2026-07-07T02:29:15Z | |
| dc.description | By means of near-simultaneous multi-wavelength VLBA measurements, we determine for the first time the intrinsic size of Sgr A* to be 3.6 AU by <1 AU with the major axis oriented essentially north-south. Contrary to previous expectation that the intrinsic structure of Sgr A* is observable only at wavelength shorter than 1 mm, we can discern the intrinsic source size at 7~mm because (1) the scattering size along the minor axis is half that along the major axis, and (2) the near simultaneous multi-wavelength mapping of Sgr A* makes it possible to extrapolate precisely the minor axis scattering angle at 7~mm. The intrinsic size and shape place direct constraints on the various theoretical models for Sgr A*. | |
| dc.description | 8 pages including 3 figures and 1 table, LaTeX, uses paspconf.sty, to appear in the proceedings of "The Central Parsecs", Tuscon, Sept. 7-11 1998, eds.H. Falcke, A.Cotera, W. Duschl, F. Melia and M. Rieke, ASP Conf. Series | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9811375 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9811375 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/13399 | |
| dc.subject | Astrophysics | |
| dc.title | Intrinsic Size and Shape of Sgr A*: 3.6 AU by <1 AU | |
| dc.type | text |