Bult, Peter (2017) The stochastic X-ray variability of the accreting millisecond pulsar MAXI J0911-655. Astrophysical Journal, 837 (1). Art. No. 61. ISSN 1538-4357. doi:10.3847/1538-4357/aa607f. https://resolver.caltech.edu/CaltechAUTHORS:20170222-115108839
![[img]](https://authors.library.caltech.edu/style/images/fileicons/application_pdf.png) |
PDF
- Accepted Version
See Usage Policy. 509kB |
Use this Persistent URL to link to this item: https://resolver.caltech.edu/CaltechAUTHORS:20170222-115108839
Abstract
In this work, I report on the stochastic X-ray variability of the 340 Hz accreting millisecond pulsar MAXI J0911–655. Analyzing pointed observations of the XMM-Newton and NuSTAR observatories, I find that the source shows broad band-limited stochastic variability in the 0.01-10 Hz range with a total fractional variability of ~24% rms in the 0.4-3 keV energy band that increases to ~40% rms in the 3–10 keV band. Additionally, a pair of harmonically related quasi-periodic oscillations (QPOs) are discovered. The fundamental frequency of this harmonic pair is observed between frequencies of 62 and 146 mHz. Like the band-limited noise, the amplitudes of the QPOs show a steep increase as a function of energy; this suggests that they share a similar origin, likely the inner accretion flow. Based on their energy dependence and frequency relation with respect to the noise terms, the QPOs are identified as low-frequency oscillations and discussed in terms of the Lense–Thirring precession model.
| Item Type: | Article | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Related URLs: |
| |||||||||
| Additional Information: | © 2017 The American Astronomical Society. Received 2017 January 5; revised 2017 February 3; accepted 2017 February 8; published 2017 March 3. I would like to thank Marieke van Doesburgh for sharing some of the data behind Figure 4 and the referee for constructive feedback that helped improve the paper. This work was supported by an NPP fellowship at NASA Goddard Space Flight Center. | |||||||||
| Group: | NuSTAR | |||||||||
| Subject Keywords: | X-rays: individual (MAXI J0911-655) – stars: neutron – X-rays: binaries | |||||||||
| Issue or Number: | 1 | |||||||||
| DOI: | 10.3847/1538-4357/aa607f | |||||||||
| Record Number: | CaltechAUTHORS:20170222-115108839 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20170222-115108839 | |||||||||
| Official Citation: | Peter Bult 2017 ApJ 837 61 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 74470 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Joy Painter | |||||||||
| Deposited On: | 22 Feb 2017 19:56 | |||||||||
| Last Modified: | 11 Nov 2021 05:27 |
Repository Staff Only: item control page
