Source-intrinsic near-infrared properties of Sgr A*: Total intensity measurements

0382833 - ASÚ 2013 RIV US eng J - Článek v odborném periodiku
Witzel, G. - Eckart, A. - Bremer, M. - Zamaninasab, M. - Shanzamanian, B. - Valencia-S, M. - Schoedel, R. - Karas, Vladimír - Lenzen, R. - Marchili, N. - Sabha, N. - García-Marín, M. - Buchholz, R. M. - Kunneriath, Devaky - Straubmeier, C.
Source-intrinsic near-infrared properties of Sgr A*: Total intensity measurements.
Astrophysical Journal Supplement Series. Roč. 203, č. 2 (2012), 18/1-18/36. ISSN 0067-0049. E-ISSN 1538-4365
Grant CEP: GA MŠMT ME09036
Institucionální podpora: RVO:67985815
Klíčová slova: black holes * galactic centre
Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika

We present a comprehensive data description for K s-band measurements of Sgr A*. We characterize the statistical properties of the variability of Sgr A* in the near-infrared, which we find to be consistent with a single-state process forming a power-law distribution of the flux density. We discover a linear rms-flux relation for the flux density range up to 12 mJy on a timescale of 24 minutes. This and the power-law flux density distribution implies a phenomenological, formally nonlinear statistical variability model with which we can simulate the observed variability and extrapolate its behavior to higher flux levels and longer timescales.
Trvalý link: http://hdl.handle.net/11104/0212948