Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...439..682c&link_type=abstract
The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 439, no. 2, p. 682-686
Astronomy and Astrophysics
Astronomy
15
Black Holes (Astronomy), Galactic Bulge, Infrared Photometry, Milky Way Galaxy, Sagittarius Constellation, Accretion Disks, Flux Density, Luminosity, Position Errors, Variability
Scientific paper
An infrared source has been imaged within 0.2 +/- 0.3 arcseconds of the unique Galactic center radio source Sgr A* High angular resolution (averaged value of the Full Width at Half Maximum (FWHM) approximately 0.55 arcseconds) was achieved by rapid (approximately 50 Hz) real-time images motion compensation. The source's near-infrared magnitudes (K = 12.1 +/- 0.3, H = 13.7 +/- 0.3, and J = 16.6 +/- 0.4) are consistent with a hot object reddened by the local extinction Av approximately 27). At the 3 sigma level of confidence, a time series of 80 images limits the source variability to less than 50% on timescales from 3 to 30 minutes. The photometry is consistent with the emission from a simple accretion disk model for a approximately 1 x 106 solar mass black hole. However, the fluxes are also consistent with a hot luminous (L approximately 103.5 to 104-6 solar luminosity) central cluster star positionally coincident with Sgr A*.
Close Laird M.
McCarthy Donald W. Jr.
Melia Fulvio
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