CONTINUED NEUTRON STAR CRUST COOLING OF THE 11 Hz X-RAY PULSAR IN TERZAN 5: A CHALLENGE TO HEATING AND COOLING MODELS?
The transient neutron star low-mass X-ray binary and 11 Hz X-ray pulsar IGR J17480-2446 in the globular cluster Terzan 5 exhibited an 11 week accretion outburst in 2010. Chandra observations performed within five months after the end of the outburst revealed evidence that the crust of the neutron st...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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Institute of Physics/American Astronomical Society
2015
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| Online Access: | http://hdl.handle.net/1721.1/93901 |
| _version_ | 1826197339795095552 |
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| author | Degenaar, N. Wijnands, R. Brown, E. F. Altamirano, D. Cackett, E. M. Fridriksson, Joel K. Homan, Jeroen Heinke, C. O. Miller, J. M. Pooley, D. Sivakoff, G. R. |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Degenaar, N. Wijnands, R. Brown, E. F. Altamirano, D. Cackett, E. M. Fridriksson, Joel K. Homan, Jeroen Heinke, C. O. Miller, J. M. Pooley, D. Sivakoff, G. R. |
| author_sort | Degenaar, N. |
| collection | MIT |
| description | The transient neutron star low-mass X-ray binary and 11 Hz X-ray pulsar IGR J17480-2446 in the globular cluster Terzan 5 exhibited an 11 week accretion outburst in 2010. Chandra observations performed within five months after the end of the outburst revealed evidence that the crust of the neutron star became substantially heated during the accretion episode and was subsequently cooling in quiescence. This provides the rare opportunity to probe the structure and composition of the crust. Here, we report on new Chandra observations of Terzan 5 that extend the monitoring to ≃2.2 yr into quiescence. We find that the thermal flux and neutron star temperature have continued to decrease, but remain significantly above the values that were measured before the 2010 accretion phase. This suggests that the crust has not thermally relaxed yet, and may continue to cool. Such behavior is difficult to explain within our current understanding of heating and cooling of transiently accreting neutron stars. Alternatively, the quiescent emission may have settled at a higher observed equilibrium level (for the same interior temperature), in which case the neutron star crust may have fully cooled. |
| first_indexed | 2024-09-23T10:46:11Z |
| format | Article |
| id | mit-1721.1/93901 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T10:46:11Z |
| publishDate | 2015 |
| publisher | Institute of Physics/American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/939012022-09-30T22:52:49Z CONTINUED NEUTRON STAR CRUST COOLING OF THE 11 Hz X-RAY PULSAR IN TERZAN 5: A CHALLENGE TO HEATING AND COOLING MODELS? Degenaar, N. Wijnands, R. Brown, E. F. Altamirano, D. Cackett, E. M. Fridriksson, Joel K. Homan, Jeroen Heinke, C. O. Miller, J. M. Pooley, D. Sivakoff, G. R. MIT Kavli Institute for Astrophysics and Space Research Homan, Jeroen The transient neutron star low-mass X-ray binary and 11 Hz X-ray pulsar IGR J17480-2446 in the globular cluster Terzan 5 exhibited an 11 week accretion outburst in 2010. Chandra observations performed within five months after the end of the outburst revealed evidence that the crust of the neutron star became substantially heated during the accretion episode and was subsequently cooling in quiescence. This provides the rare opportunity to probe the structure and composition of the crust. Here, we report on new Chandra observations of Terzan 5 that extend the monitoring to ≃2.2 yr into quiescence. We find that the thermal flux and neutron star temperature have continued to decrease, but remain significantly above the values that were measured before the 2010 accretion phase. This suggests that the crust has not thermally relaxed yet, and may continue to cool. Such behavior is difficult to explain within our current understanding of heating and cooling of transiently accreting neutron stars. Alternatively, the quiescent emission may have settled at a higher observed equilibrium level (for the same interior temperature), in which case the neutron star crust may have fully cooled. United States. National Aeronautics and Space Administration (NASA Chandra Award No.G03-14034A) United States. National Aeronautics and Space Administration (NASA Chandra award No. GO2-13043X) European Research Council (ERCstarting grant) Natural Sciences and Engineering Research Council of Canada (NSERC Discovery Grant) University of Alberta (Alberta Ingenuity New Faculty Award Program) 2015-02-06T16:46:18Z 2015-02-06T16:46:18Z 2013-09 2013-06 Article http://purl.org/eprint/type/JournalArticle 0004-637X 1538-4357 http://hdl.handle.net/1721.1/93901 Degenaar, N., R. Wijnands, E. F. Brown, D. Altamirano, E. M. Cackett, J. Fridriksson, J. Homan, et al. “CONTINUED NEUTRON STAR CRUST COOLING OF THE 11 Hz X-RAY PULSAR IN TERZAN 5: A CHALLENGE TO HEATING AND COOLING MODELS?” The Astrophysical Journal 775, no. 1 (September 3, 2013): 48. © 2013 American Astronomical Society. en_US http://dx.doi.org/10.1088/0004-637X/775/1/48 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 Institute of Physics/American Astronomical Society American Astronomical Society |
| spellingShingle | Degenaar, N. Wijnands, R. Brown, E. F. Altamirano, D. Cackett, E. M. Fridriksson, Joel K. Homan, Jeroen Heinke, C. O. Miller, J. M. Pooley, D. Sivakoff, G. R. CONTINUED NEUTRON STAR CRUST COOLING OF THE 11 Hz X-RAY PULSAR IN TERZAN 5: A CHALLENGE TO HEATING AND COOLING MODELS? |
| title | CONTINUED NEUTRON STAR CRUST COOLING OF THE 11 Hz X-RAY PULSAR IN TERZAN 5: A CHALLENGE TO HEATING AND COOLING MODELS? |
| title_full | CONTINUED NEUTRON STAR CRUST COOLING OF THE 11 Hz X-RAY PULSAR IN TERZAN 5: A CHALLENGE TO HEATING AND COOLING MODELS? |
| title_fullStr | CONTINUED NEUTRON STAR CRUST COOLING OF THE 11 Hz X-RAY PULSAR IN TERZAN 5: A CHALLENGE TO HEATING AND COOLING MODELS? |
| title_full_unstemmed | CONTINUED NEUTRON STAR CRUST COOLING OF THE 11 Hz X-RAY PULSAR IN TERZAN 5: A CHALLENGE TO HEATING AND COOLING MODELS? |
| title_short | CONTINUED NEUTRON STAR CRUST COOLING OF THE 11 Hz X-RAY PULSAR IN TERZAN 5: A CHALLENGE TO HEATING AND COOLING MODELS? |
| title_sort | continued neutron star crust cooling of the 11 hz x ray pulsar in terzan 5 a challenge to heating and cooling models |
| url | http://hdl.handle.net/1721.1/93901 |
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