MEASURING A TRUNCATED DISK IN AQUILA X-1
We present NuSTAR and Swift observations of the neutron star Aquila X-1 during the peak of its 2014 July outburst. The spectrum is soft with strong evidence for a broad Fe Kα line. Modeled with a relativistically broadened reflection model, we find that the inner disk is truncated with an inner radi...
| Main Authors: | , , , , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
IOP Publishing
2017
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| Online Access: | http://hdl.handle.net/1721.1/108359 https://orcid.org/0000-0001-8804-8946 |
| _version_ | 1811071593409937408 |
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| author | King, Ashley L. Tomsick, John A. Miller, Jon M. Chenevez, Jérôme Barret, Didier Boggs, Steven E. Chakrabarty, Deepto Christensen, Finn E. Craig, William W. Fürst, Felix Hailey, Charles J. Harrison, Fiona A. Parker, Michael L. Stern, Daniel Romano, Patrizia Walton, Dominic J. Zhang, William W. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics King, Ashley L. Tomsick, John A. Miller, Jon M. Chenevez, Jérôme Barret, Didier Boggs, Steven E. Chakrabarty, Deepto Christensen, Finn E. Craig, William W. Fürst, Felix Hailey, Charles J. Harrison, Fiona A. Parker, Michael L. Stern, Daniel Romano, Patrizia Walton, Dominic J. Zhang, William W. |
| author_sort | King, Ashley L. |
| collection | MIT |
| description | We present NuSTAR and Swift observations of the neutron star Aquila X-1 during the peak of its 2014 July outburst. The spectrum is soft with strong evidence for a broad Fe Kα line. Modeled with a relativistically broadened reflection model, we find that the inner disk is truncated with an inner radius of 15 ± 3R[subscript G]. The disk is likely truncated by either the boundary layer and/or a magnetic field. Associating the truncated inner disk with pressure from a magnetic field gives an upper limit of B < 5 ± x 2 x 10[superscript 8]. Although the radius is truncated far from the stellar surface, material is still reaching the neutron star surface as evidenced by the X-ray burst present in the NuSTAR observation. |
| first_indexed | 2024-09-23T08:53:38Z |
| format | Article |
| id | mit-1721.1/108359 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T08:53:38Z |
| publishDate | 2017 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1083592022-09-30T11:58:16Z MEASURING A TRUNCATED DISK IN AQUILA X-1 King, Ashley L. Tomsick, John A. Miller, Jon M. Chenevez, Jérôme Barret, Didier Boggs, Steven E. Chakrabarty, Deepto Christensen, Finn E. Craig, William W. Fürst, Felix Hailey, Charles J. Harrison, Fiona A. Parker, Michael L. Stern, Daniel Romano, Patrizia Walton, Dominic J. Zhang, William W. Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Chakrabarty, Deepto We present NuSTAR and Swift observations of the neutron star Aquila X-1 during the peak of its 2014 July outburst. The spectrum is soft with strong evidence for a broad Fe Kα line. Modeled with a relativistically broadened reflection model, we find that the inner disk is truncated with an inner radius of 15 ± 3R[subscript G]. The disk is likely truncated by either the boundary layer and/or a magnetic field. Associating the truncated inner disk with pressure from a magnetic field gives an upper limit of B < 5 ± x 2 x 10[superscript 8]. Although the radius is truncated far from the stellar surface, material is still reaching the neutron star surface as evidenced by the X-ray burst present in the NuSTAR observation. 2017-04-21T18:59:22Z 2017-04-21T18:59:22Z 2016-03 2015-10 Article http://purl.org/eprint/type/JournalArticle 2041-8213 2041-8205 http://hdl.handle.net/1721.1/108359 King, Ashley L., John A. Tomsick, Jon M. Miller, Jérôme Chenevez, Didier Barret, Steven E. Boggs, Deepto Chakrabarty, et al. “MEASURING A TRUNCATED DISK IN AQUILA X-1.” The Astrophysical Journal 819, no. 2 (March 7, 2016): L29. © 2016 The American Astronomical Society https://orcid.org/0000-0001-8804-8946 en_US http://dx.doi.org/10.3847/2041-8205/819/2/l29 Astrophysical Journal. Letters 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 IOP Publishing |
| spellingShingle | King, Ashley L. Tomsick, John A. Miller, Jon M. Chenevez, Jérôme Barret, Didier Boggs, Steven E. Chakrabarty, Deepto Christensen, Finn E. Craig, William W. Fürst, Felix Hailey, Charles J. Harrison, Fiona A. Parker, Michael L. Stern, Daniel Romano, Patrizia Walton, Dominic J. Zhang, William W. MEASURING A TRUNCATED DISK IN AQUILA X-1 |
| title | MEASURING A TRUNCATED DISK IN AQUILA X-1 |
| title_full | MEASURING A TRUNCATED DISK IN AQUILA X-1 |
| title_fullStr | MEASURING A TRUNCATED DISK IN AQUILA X-1 |
| title_full_unstemmed | MEASURING A TRUNCATED DISK IN AQUILA X-1 |
| title_short | MEASURING A TRUNCATED DISK IN AQUILA X-1 |
| title_sort | measuring a truncated disk in aquila x 1 |
| url | http://hdl.handle.net/1721.1/108359 https://orcid.org/0000-0001-8804-8946 |
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