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http://hdl.handle.net/2289/6681Full metadata record
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.author | Yadav, J.S. | - |
| dc.contributor.author | Misra, Ranjeev | - |
| dc.contributor.author | Paul, Biswajit | - |
| dc.contributor.author | Ishwara-Chandra, C.H. | - |
| dc.contributor.author | +9 Co-authors | - |
| dc.date.accessioned | 2017-07-25T10:39:16Z | - |
| dc.date.available | 2017-07-25T10:39:16Z | - |
| dc.date.issued | 2016-12-10 | - |
| dc.identifier.citation | Astrophysical Journal, 2016, Vol. 833, p 27 | en_US |
| dc.identifier.issn | 0004-637X | - |
| dc.identifier.issn | 1538-4357-(Online) | - |
| dc.identifier.uri | http://hdl.handle.net/2289/6681 | - |
| dc.description | Open Access | en_US |
| dc.description.abstract | We present the first quick look analysis of data from nine AstroSat's Large Area X-ray Proportional Counter (LAXPC) observations of GRS 1915+105 during 2016 March when the source had the characteristics of being in the Radio-quiet χ class. We find that a simple empirical model of a disk blackbody emission, with Comptonization and a broad Gaussian Iron line can fit the time-averaged 3–80 keV spectrum with a systematic uncertainty of 1.5% and a background flux uncertainty of 4%. A simple dead time corrected Poisson noise level spectrum matches well with the observed high-frequency power spectra till 50 kHz and as expected the data show no significant high-frequency ($\gt 20\,\mathrm{Hz}$) features. Energy dependent power spectra reveal a strong low-frequency (2–8 Hz) quasi-periodic oscillation and its harmonic along with broadband noise. The QPO frequency changes rapidly with flux (nearly 4 Hz in ~5 hr). With increasing QPO frequency, an excess noise component appears significantly in the high-energy regime ($\gt 8$ keV). At the QPO frequencies, the time-lag as a function of energy has a non-monotonic behavior such that the lags decrease with energy till about 15–20 keV and then increase for higher energies. These first-look results benchmark the performance of LAXPC at high energies and confirms that its data can be used for more sophisticated analysis such as flux or frequency-resolved spectro-timing studies. | en_US |
| dc.language.iso | en | en_US |
| dc.publisher | IOP Sciences for The American Astronomical Society | en_US |
| dc.relation.uri | http://adsabs.harvard.edu/abs/2016ApJ...833...27Y | en_US |
| dc.relation.uri | http://arxiv.org/abs/1608.07023 | en_US |
| dc.relation.uri | http://dx.doi.org/10.3847/0004-637X/833/1/27 | en_US |
| dc.rights | 2016, The American Astronomical Society. | en_US |
| dc.subject | accretion | en_US |
| dc.subject | black hole physics | en_US |
| dc.title | Astrosat/laxpc reveals the high-energy variability of GRS 1915+105 in the χ class | en_US |
| dc.type | Article | en_US |
| Appears in Collections: | Research Papers (A&A) | |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2016_AstroPhyJournal_833_27.pdf | Open Access | 1.39 MB | Adobe PDF | View/Open |
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