Physics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002gcnew..15....4z&link_type=abstract
GCNEWS - Galactic Center Newsletter, vol. 15, p. 4-9 (eds. A. Cotera, H. Falcke, & S. Markoff)
Physics
1
Galactic Center, Sma, Sgr A*, Submm
Scientific paper
We summarize the results from recent observations of Sgr A* at short-/sub-millimeter wavelengths made with the partially finished Sub-Millimeter Array (SMA) on Mauna Kea. A total of 25 epochs of observations were carried out over the past 15 months. Noticeable variations in flux density at lambda 1.3 mm were observed showing three ''flares''. The SMA observations suggest that Sgr A* is highly pulsed towards the submillimeter wavelengths during a flare suggesting the presence of a break wavelength around lambda 3 mm. Cross-correlations of the SMA data at lambda 1 mm with the lambda 1 cm data obtained with the VLA show negative lags, suggesting that sub-millimeter wavelengths tend to peak first. The SMA observations indicate that Sgr A* is constantly powered by the central engine but the flaring plasma might well be confined within the characteristic radius (40 Rsc) at lambda 3 mm. The SMA data appears to provide unique, important information for understanding the puzzling phenomenon of Sgr A*. The trial observations of Sgr A* have demonstrated that the SMA is a powerful telescope for studying the nature of accretion flows, possible outflows and their immediate environments surrounding a supermassive black hole.
No associations
LandOfFree
Submm Array Observations of Sagittarius A* does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Submm Array Observations of Sagittarius A*, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Submm Array Observations of Sagittarius A* will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-733096