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http://hdl.handle.net/20.500.12386/32802
Titolo: | Masers and Galactic structure: Micro-arcsecond astrometry with the VLBA | Autori: | Reid, M. J. Brunthaler, A. Menten, K. M. Ye, Xu Xing-Wu, Zheng MOSCADELLI, Luca |
Data pubblicazione: | 2007 | Titolo del volume in cui è pubblicato il poster: | Astrophysical Masers and their Environments | Curatore/i del volume in cui è pubblicato il contributo: | Chapman, Jessica M.; Baan, Willem A. | Serie: | PROCEEDINGS OF THE INTERNATIONAL ASTRONOMICAL UNION | Numero: | vol. 3, S242 | Da pagina:: | 348 | Abstract: | Astrometric observations with the VLBA with accuracies approaching ~ 10 μas are being conducted in order to better understand the Galaxy. The location of Sgr A* on infrared images can be determined with an accuracy of a few mas, using stars with SiO maser emission as a calibration grid for infrared images. The apparent proper motion of Sgr A*, which is dominated by the effects of the orbit of the Sun around the Galactic center, has been measured with high accuracy. This measurement strongly constrains Θ<SUB>0</SUB>R<SUB>0</SUB> and offers a dynamical definition of the Galactic plane with Sgr A* at its origin. The intrinsic motion of Sgr A* is very small and comparable to that expected for a supermassive black hole. When combined with infrared results, this provides overwhelming evidence that Sgr A* is a supermassive black hole. Finally, we are engaged in a large project to map the spiral structure and kinematics of the Galaxy. Preliminary trigonometric parallaxes, obtained with the VLBA, to eight massive star forming regions are presented. | Titolo del convegno: | Astrophysical Masers and their Environments | Luogo del convegno: | Alice Springs, Australia | Periodo del convegno: | March 12-16, 2007 | URI: | http://hdl.handle.net/20.500.12386/32802 | URL: | https://www.cambridge.org/core/journals/proceedings-of-the-international-astronomical-union/article/masers-and-galactic-structure-microarcsecond-astrometry-with-the-vlba/9AD7F6C06EBEC5055553D487E2482D40 https://api.elsevier.com/content/abstract/scopus_id/38849204211 |
ISSN: | 1743-9213 | ISBN: | 978-0521-87464-9 | DOI: | 10.1017/S1743921307013361 | Bibcode ADS: | 2007IAUS..242..348R | Fulltext: | open |
È visualizzato nelle collezioni: | 3.01 Contributi in Atti di convegno |
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