VLBA Imaging at 7 mm and Linear Polarimetric Observations at 6 cm and 3 mm of Sagittarius A*

Simple item page
dc.creatorBower, Geoffrey C.
dc.creatorFalcke, Heino
dc.creatorBacker, Don
dc.creatorWright, Melvyn
dc.date1998-11-13
dc.date.accessioned2026-07-07T02:29:06Z
dc.date.available2026-07-07T02:29:06Z
dc.descriptionWe summarize the results of 7 mm VLBA imaging of Sgr A* and discuss some of the difficulties of accurately constraining the size of Sgr A* with VLBI observations. Our imaging results are fully consistent with the hypothesis that the VLBA image of Sgr A* is a resolved elliptical Gaussian caused by the scattering of an intervening thermal plasma. We show that determination of the minor axis size at 7 mm with the VLBA is very unreliable. We also present new polarimetric observations from the VLA and from the BIMA array of Sgr A*. At 4.8 GHz, we find an upper limit to the polarization of 0.1%. At 86 GHz, we report a marginal detection of $1 \pm 1$% linear polarization. We discuss the effects of interstellar propagation on the linear polarization and consider the significance of very low intrinsic linear polarization in Sgr A*.
dc.description10 pages, 3 figures, to appear in "The Central Parsecs of the Galaxy", eds. H. Falcke, A. Cotera, W. Duschl, F. Melia, M. Rieke, ASP Conf. Series
dc.identifierhttps://arxiv.org/abs/astro-ph/9811214
dc.identifierhttp://arxiv.org/abs/astro-ph/9811214
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13336
dc.subjectAstrophysics
dc.titleVLBA Imaging at 7 mm and Linear Polarimetric Observations at 6 cm and 3 mm of Sagittarius A*
dc.typetext

Files

Collections

arXiv