Computer Science
Scientific paper
Apr 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006atnf.prop..247m&link_type=abstract
ATNF proposal C1477, Semester: April, 2006
Computer Science
Galactic, Atca
Scientific paper
We propose 3-mm ATCA monitoring for intraday variability (IDV) in Sagittarius A* (Sgr A*), the supermassive black hole at the Galactic Center. Our 3- & 2-mm Nobeyama Millimeter Array (NMA) monitoring of Sgr A* has revealed flares lasting from hours to months, including an IDV detection. ATCA would provide higher angular resolution, a longer observing window, and better calibrations, for tracking these flares. We did a 10 hr `pilot' 3-mm ATCA observation on 18 Oct 2005. The large flux variation in the 3-mm light-curve shows probably the IDV of Sgr A*, this result has demonstrated that the ATCA is very useful in searching the IDV profile. We propose to use our approved 3-mm VLBA time (Shen et al.) for a joint observation with ATCA to look for correlated structural variations during flares; our combined efforts should supply complementary constraints on Sgr A* radio source emission models. Moreover, the coordinated ATCA-NMA observing of Sgr A* would also provide cross-system 3-mm calibration checks, and confirmations of IDV flares.
Fletcher Andre B.
Miyazaki Atsushi
Miyoshi Makoto
Sault Bob
Shen Zhi-Qiang
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