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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 660585.0, MPI für Astronomie / Publikationen_mpia
Source-intrinsic near-infrared properties of Sgr A*: Total intensity measurements
Authors:Witzel, G.; Eckart, A.; Bremer, M.; Zamaninasab, M.; Shahzamanian, B.; Valencia-S., M.; Schödel, R.; Karas, V.; Lenzen, R.; Marchili, N.; Sabha, N.; Garcia-Marin, M.; Buchholz, R. M.; Kunneriath, D.; Straubmeier, C.
Date of Publication (YYYY-MM-DD):2012
Journal Abbrev.:The Astrophysical Journal Supplement Series
Issue / Number:2
Start Page:id. 18
Audience:Not Specified
Abstract / Description:We present a comprehensive data description for Ks-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 non-linear 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 min and 100 min compared to what is expected from a red noise random process.
Free Keywords:Astrophysics - High Energy Astrophysical Phenomena; Astrophysics - Galaxy Astrophysics
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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