Search for the event horizon by means of optical observations with high temporal resolution

Details Search for the event horizon by means of optical observations with high temporal resolution Search for the event horizon by means of optical observations with high temporal resolution

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..159b&link_type=abstract

Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #

Astronomy and Astrophysics

Astronomy

Scientific paper

The essential property of the black hole is the presence of the event horizon instead of the surface. It may be detected only by means of the detailed study of the emission features (temporal, spectral, polarimetric) of its surroundings. The temporal resolution of such observations has to be better than r[g]/c and lays in the 10-6 - 10 s range depending on the black hole mass. In SAO RAS we have developed the MANIA hardware and software complex based on the panoramic photon counter and use it in observations on 6-m telescope for the search and investigation of the optical variability on the time scales of 10-6 - 103 s of various astronomical objects. We present the hardware and methods used for these photometrical, spectroscopic and polarimetrical observations, the principles and criteria of the object selection, first of all - probable isolated black holes. The list of the latter includes objects with featureless optical spectra (DC white dwarfs, blazars), unidentified gamma-ray sources and long microlensing events. We present the results of the timing observations of the location of the MACHO-1999-BLG-22 object. The limits on the power of variable emission component are derived on the level of 20% to 1% of the background brightness on the time scales from 10 us up to 1000 s, and compared with the results of the optical and IR (Hubble, REM) and x-ray (Chandra, ROSAT), and with the theoretical predictions. The general conclusion is that the lens in this object is the black hole with mass of 20-30 M[sun], located in the bulge. Also, we'll present the results of the observations on the 6-m telescope in June-July 2006.

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