NuSTAR STUDY OF HARD X-RAY MORPHOLOGY AND SPECTROSCOPY OF PWN G21.5–0.9
We present NuSTAR high-energy X-ray observations of the pulsar wind nebula (PWN)/supernova remnant G21.5–0.9. We detect integrated emission from the nebula up to ~40 keV, and resolve individual spatial features over a broad X-ray band for the first time. The morphology seen by NuSTAR agrees well wit...
| Main Authors: | , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2015
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| Online Access: | http://hdl.handle.net/1721.1/92935 |
| _version_ | 1826190213431427072 |
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| author | Nynka, Melania Hailey, Charles J. Reynolds, Stephen P. An, Hongjun Boggs, Steven E. Christensen, Finn E. Craig, William W. Gotthelf, Eric V. Grefenstette, Brian W. Harrison, Fiona A. Krivonos, Roman A. Madsen, Kristin K. Mori, Kaya Perez, Kerstin Stern, Daniel Wik, Daniel R. Zhang, William W. Zoglauer, Andreas Baganoff, Frederick K |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Nynka, Melania Hailey, Charles J. Reynolds, Stephen P. An, Hongjun Boggs, Steven E. Christensen, Finn E. Craig, William W. Gotthelf, Eric V. Grefenstette, Brian W. Harrison, Fiona A. Krivonos, Roman A. Madsen, Kristin K. Mori, Kaya Perez, Kerstin Stern, Daniel Wik, Daniel R. Zhang, William W. Zoglauer, Andreas Baganoff, Frederick K |
| author_sort | Nynka, Melania |
| collection | MIT |
| description | We present NuSTAR high-energy X-ray observations of the pulsar wind nebula (PWN)/supernova remnant G21.5–0.9. We detect integrated emission from the nebula up to ~40 keV, and resolve individual spatial features over a broad X-ray band for the first time. The morphology seen by NuSTAR agrees well with that seen by XMM-Newton and Chandra below 10 keV. At high energies, NuSTAR clearly detects non-thermal emission up to ~20 keV that extends along the eastern and northern rim of the supernova shell. The broadband images clearly demonstrate that X-ray emission from the North Spur and Eastern Limb results predominantly from non-thermal processes. We detect a break in the spatially integrated X-ray spectrum at ~9 keV that cannot be reproduced by current spectral energy distribution models, implying either a more complex electron injection spectrum or an additional process such as diffusion compared to what has been considered in previous work. We use spatially resolved maps to derive an energy-dependent cooling length scale, L(E) E[superscript m] with m = –0.21 ± 0.01. We find this to be inconsistent with the model for the morphological evolution with energy described by Kennel & Coroniti. This value, along with the observed steepening in power-law index between radio and X-ray, can be quantitatively explained as an energy-loss spectral break in the simple scaling model of Reynolds, assuming particle advection dominates over diffusion. This interpretation requires a substantial departure from spherical magnetohydrodynamic, magnetic-flux-conserving outflow, most plausibly in the form of turbulent magnetic-field amplification. |
| first_indexed | 2024-09-23T08:36:48Z |
| format | Article |
| id | mit-1721.1/92935 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:36:48Z |
| publishDate | 2015 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/929352022-09-23T13:16:21Z NuSTAR STUDY OF HARD X-RAY MORPHOLOGY AND SPECTROSCOPY OF PWN G21.5–0.9 Nynka, Melania Hailey, Charles J. Reynolds, Stephen P. An, Hongjun Boggs, Steven E. Christensen, Finn E. Craig, William W. Gotthelf, Eric V. Grefenstette, Brian W. Harrison, Fiona A. Krivonos, Roman A. Madsen, Kristin K. Mori, Kaya Perez, Kerstin Stern, Daniel Wik, Daniel R. Zhang, William W. Zoglauer, Andreas Baganoff, Frederick K MIT Kavli Institute for Astrophysics and Space Research Baganoff, Frederick K. We present NuSTAR high-energy X-ray observations of the pulsar wind nebula (PWN)/supernova remnant G21.5–0.9. We detect integrated emission from the nebula up to ~40 keV, and resolve individual spatial features over a broad X-ray band for the first time. The morphology seen by NuSTAR agrees well with that seen by XMM-Newton and Chandra below 10 keV. At high energies, NuSTAR clearly detects non-thermal emission up to ~20 keV that extends along the eastern and northern rim of the supernova shell. The broadband images clearly demonstrate that X-ray emission from the North Spur and Eastern Limb results predominantly from non-thermal processes. We detect a break in the spatially integrated X-ray spectrum at ~9 keV that cannot be reproduced by current spectral energy distribution models, implying either a more complex electron injection spectrum or an additional process such as diffusion compared to what has been considered in previous work. We use spatially resolved maps to derive an energy-dependent cooling length scale, L(E) E[superscript m] with m = –0.21 ± 0.01. We find this to be inconsistent with the model for the morphological evolution with energy described by Kennel & Coroniti. This value, along with the observed steepening in power-law index between radio and X-ray, can be quantitatively explained as an energy-loss spectral break in the simple scaling model of Reynolds, assuming particle advection dominates over diffusion. This interpretation requires a substantial departure from spherical magnetohydrodynamic, magnetic-flux-conserving outflow, most plausibly in the form of turbulent magnetic-field amplification. United States. National Aeronautics and Space Administration (Contract NNG08FD60C) 2015-01-16T16:10:16Z 2015-01-16T16:10:16Z 2014-07 2013-11 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/92935 Nynka, Melania, Charles J. Hailey, Stephen P. Reynolds, Hongjun An, Frederick K. Baganoff, Steven E. Boggs, Finn E. Christensen, et al. “NuSTAR STUDY OF HARD X-RAY MORPHOLOGY AND SPECTROSCOPY OF PWN G21.5–0.9.” The Astrophysical Journal 789, no. 1 (June 17, 2014): 72. © 2014 The American Astronomical Society en_US http://dx.doi.org/10.1088/0004-637x/789/1/72 The Astrophysical Journal Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf IOP Publishing American Astronomical Society |
| spellingShingle | Nynka, Melania Hailey, Charles J. Reynolds, Stephen P. An, Hongjun Boggs, Steven E. Christensen, Finn E. Craig, William W. Gotthelf, Eric V. Grefenstette, Brian W. Harrison, Fiona A. Krivonos, Roman A. Madsen, Kristin K. Mori, Kaya Perez, Kerstin Stern, Daniel Wik, Daniel R. Zhang, William W. Zoglauer, Andreas Baganoff, Frederick K NuSTAR STUDY OF HARD X-RAY MORPHOLOGY AND SPECTROSCOPY OF PWN G21.5–0.9 |
| title | NuSTAR STUDY OF HARD X-RAY MORPHOLOGY AND SPECTROSCOPY OF PWN G21.5–0.9 |
| title_full | NuSTAR STUDY OF HARD X-RAY MORPHOLOGY AND SPECTROSCOPY OF PWN G21.5–0.9 |
| title_fullStr | NuSTAR STUDY OF HARD X-RAY MORPHOLOGY AND SPECTROSCOPY OF PWN G21.5–0.9 |
| title_full_unstemmed | NuSTAR STUDY OF HARD X-RAY MORPHOLOGY AND SPECTROSCOPY OF PWN G21.5–0.9 |
| title_short | NuSTAR STUDY OF HARD X-RAY MORPHOLOGY AND SPECTROSCOPY OF PWN G21.5–0.9 |
| title_sort | nustar study of hard x ray morphology and spectroscopy of pwn g21 5 0 9 |
| url | http://hdl.handle.net/1721.1/92935 |
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