NO TIME FOR DEAD TIME: TIMING ANALYSIS OF BRIGHT BLACK HOLE BINARIES WITH NuSTAR

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Details zur Publikation

Autorinnen und Autoren: Bachetti M, Harrison FA, Cook R, Tomsick J, Schmid C, Grefenstette BW, Barret D, Boggs SE, Christensen FE, Craig WW, Fabian AC, Fuerst F, Gandhi P, Hailey CJ, Kara E, Maccarone TJ, Miller JM, Pottschmidt K, Stern D, Uttley P, Walton DJ, Wilms J, Zhang WW
Zeitschrift: Astrophysical Journal
Verlag: American Astronomical Society
Jahr der Veröffentlichung: 2015
Band: 800
ISSN: 0004-637X


Abstract

Timing of high-count-rate sources with the NuSTAR Small Explorer Mission requires specialized analysis techniques. NuSTAR was primarily designed for spectroscopic observations of sources with relatively low count rates rather than for timing analysis of bright objects. The instrumental dead time per event is relatively long (similar to 2.5msec) and varies event-to-event by a few percent. The most obvious effect is a distortion of the white noise level in the power density spectrum (PDS) that cannot be easily modeled with standard techniques due to the variable nature of the dead time. In this paper, we show that it is possible to exploit the presence of two completely independent focal planes and use the cospectrum, the real part of the cross PDS, to obtain a good proxy of the white-noise-subtracted PDS. Thereafter, one can use a Monte Carlo approach to estimate the remaining effects of dead time, namely, a frequency-dependent modulation of the variance and a frequency-independent drop of the sensitivity to variability. In this way, most of the standard timing analysis can be performed, albeit with a sacrifice in signal-to-noise ratio relative to what would be achieved using more standard techniques. We apply this technique to NuSTAR observations of the black hole binaries GX 339-4, Cyg X-1, and GRS 1915+105.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Schmid, Christian Dr.
Dr.Karl-Remeis-Sternwarte Bamberg, Astronomisches Institut
Wilms, Jörn Prof. Dr.
Professur für Astronomie und Astrophysik


Einrichtungen weiterer Autorinnen und Autoren

California Institute of Technology (Caltech)
Columbia University
Durham University
National Aeronautics and Space Administration (NASA)
Technical University of Denmark / Danmarks Tekniske Universitet (DTU)
Texas Tech University (TTU)
University of Amsterdam
University of California, Berkeley
University of Cambridge
University of Maryland, Baltimore County
University of Michigan
University of Toulouse


Zitierweisen

APA:
Bachetti, M., Harrison, F.A., Cook, R., Tomsick, J., Schmid, C., Grefenstette, B.W.,... Zhang, W.W. (2015). NO TIME FOR DEAD TIME: TIMING ANALYSIS OF BRIGHT BLACK HOLE BINARIES WITH NuSTAR. Astrophysical Journal, 800. https://dx.doi.org/10.1088/0004-637X/800/2/109

MLA:
Bachetti, Matteo, et al. "NO TIME FOR DEAD TIME: TIMING ANALYSIS OF BRIGHT BLACK HOLE BINARIES WITH NuSTAR." Astrophysical Journal 800 (2015).

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