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Proceedings Paper

Beating the confusion limit: the necessity of high angular resolution for probing the physics of Sagittarius A* and its environment: opportunities for LINC-NIRVANA (LBT), GRAVITY (VLTI) and and METIS (E-ELT)
Author(s): A. Eckart; N. Sabha; G. Witzel; C. Straubmeier; B. Shahzamanian; M. Valencia-S.; Macarena García-Marín; M. Horrobin; L. Moser; J. Zuther; S. Fischer; C. Rauch; S. Rost; C. Iserlohe; S. Yazici; S. Smajic; M. Wiest; C. Araujo-Hauck; I. Wank
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Paper Abstract

The super-massive 4 million solar mass black hole (SMBH) SgrA* shows variable emission from the millimeter to the X-ray domain. A detailed analysis of the infrared light curves allows us to address the accretion phenomenon in a statistical way. The analysis shows that the near-infrared flux density excursions are dominated by a single state power law, with the low states of SgrA* are limited by confusion through the unresolved stellar background. We show that for 8-10m class telescopes blending effects along the line of sight will result in artificial compact star-like objects of 0.5-1 mJy that last for about 3-4 years. We discuss how the imaging capabilities of GRAVITY at the VLTI, LINC-NIRVANA at the LBT and METIS at the E-ELT will contribute to the investigation of the low variability states of SgrA*.

Paper Details

Date Published: 12 September 2012
PDF: 10 pages
Proc. SPIE 8445, Optical and Infrared Interferometry III, 84451F (12 September 2012); doi: 10.1117/12.925157
Show Author Affiliations
A. Eckart, Univ. of Cologne (Germany)
MPIfR (Germany)
N. Sabha, Univ. of Cologne (Germany)
G. Witzel, Univ. of Cologne (Germany)
Univ. of California, Los Angeles (United States)
C. Straubmeier, Univ. of Cologne (Germany)
B. Shahzamanian, Univ. of Cologne (Germany)
MPIfR (Germany)
M. Valencia-S., Univ. of Cologne (Germany)
MPIfR (Germany)
Macarena García-Marín, Univ. of Cologne (Germany)
M. Horrobin, Univ. of Cologne (Germany)
L. Moser, Univ. of Cologne (Germany)
J. Zuther, Univ. of Cologne (Germany)
S. Fischer, Univ. of Cologne (Germany)
C. Rauch, Univ. of Cologne (Germany)
S. Rost, Univ. of Cologne (Germany)
C. Iserlohe, Univ. of Cologne (Germany)
S. Yazici, Univ. of Cologne (Germany)
S. Smajic, Univ. of Cologne (Germany)
M. Wiest, Univ. of Cologne (Germany)
C. Araujo-Hauck, Univ. of Cologne (Germany)
I. Wank, Univ. of Cologne (Germany)

Published in SPIE Proceedings Vol. 8445:
Optical and Infrared Interferometry III
Françoise Delplancke; Jayadev K. Rajagopal; Fabien Malbet, Editor(s)

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