Witzel, G., Eckart, A., Bremer, M., Zamaninasab, M., Shahzamanian, B., Valencia-S, M., Schoedel, R., Karas, V., Lenzen, R., Marchili, N., Sabha, N., Garcia-Marin, M., Buchholz, R. M., Kunneriath, D. and Straubmeier, C. (2012). SOURCE-INTRINSIC NEAR-INFRARED PROPERTIES OF SGR A*: TOTAL INTENSITY MEASUREMENTS. Astrophys. J. Suppl. Ser., 203 (2). BRISTOL: IOP PUBLISHING LTD. ISSN 1538-4365

Full text not available from this repository.

Abstract

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. We present reasons why data with our cadence cannot be used to decide on the question whether the power spectral density of the underlying random process shows more structure at timescales between 25 minutes and 100 minutes compared to what is expected from a red-noise random process.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Witzel, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eckart, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bremer, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zamaninasab, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shahzamanian, B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Valencia-S, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schoedel, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Karas, V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lenzen, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Marchili, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sabha, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Garcia-Marin, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Buchholz, R. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kunneriath, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Straubmeier, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-477428
DOI: 10.1088/0067-0049/203/2/18
Journal or Publication Title: Astrophys. J. Suppl. Ser.
Volume: 203
Number: 2
Date: 2012
Publisher: IOP PUBLISHING LTD
Place of Publication: BRISTOL
ISSN: 1538-4365
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
SUPERMASSIVE BLACK-HOLE; X-RAY VARIABILITY; GALACTIC-CENTER; STELLAR ORBITS; SPECTRAL INDEX; CENTRAL PARSEC; POWER SPECTRA; TIME-SERIES; LIGHT-CURVE; XMM-NEWTONMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/47742

Downloads

Downloads per month over past year

Altmetric

Export

Actions (login required)

View Item View Item