THE DARK-MATTER FRACTION IN THE ELLIPTICAL GALAXY LENSING THE QUASAR PG 1115+080
We determine the most likely dark-matter fraction in the elliptical galaxy quadruply lensing the quasar PG 1115+080 based on analyses of the X-ray fluxes of the individual images in 2000 and 2008. Between the two epochs, the A[subscript 2] image of PG 1115+080 brightened relative to the other images...
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| Format: | Article |
| Language: | en_US |
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American Astronomical Society
2010
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| Online Access: | http://hdl.handle.net/1721.1/52645 https://orcid.org/0000-0002-5665-4172 https://orcid.org/0000-0003-3182-5569 |
| _version_ | 1826213912136122368 |
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| author | Pooley, D. Blackburne, Jeffrey A. Schechter, Paul L. Wambsganss, J. Rappaport, Saul A Schwab, J. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Pooley, D. Blackburne, Jeffrey A. Schechter, Paul L. Wambsganss, J. Rappaport, Saul A Schwab, J. |
| author_sort | Pooley, D. |
| collection | MIT |
| description | We determine the most likely dark-matter fraction in the elliptical galaxy quadruply lensing the quasar PG 1115+080 based on analyses of the X-ray fluxes of the individual images in 2000 and 2008. Between the two epochs, the A[subscript 2] image of PG 1115+080 brightened relative to the other images by a factor of 6 in X-rays. We argue that the A[subscript 2] image had been highly demagnified in 2000 by stellar microlensing in the intervening galaxy and has recently crossed a caustic, thereby creating a new pair of microimages and brightening in the process. Over the same period, the A[subscript 2] image has brightened by a factor of only 1.2 in the optical. The most likely ratio of smooth material (dark matter) to clumpy material (stars) in the lensing galaxy to explain the observations is ~90% of the matter in a smooth dark-matter component and ~10% in stars. |
| first_indexed | 2024-09-23T15:56:48Z |
| format | Article |
| id | mit-1721.1/52645 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:56:48Z |
| publishDate | 2010 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | mit-1721.1/526452022-09-29T17:14:00Z THE DARK-MATTER FRACTION IN THE ELLIPTICAL GALAXY LENSING THE QUASAR PG 1115+080 Pooley, D. Blackburne, Jeffrey A. Schechter, Paul L. Wambsganss, J. Rappaport, Saul A Schwab, J. Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Rappaport, Saul A. Blackburne, Jeffrey A. Rappaport, Saul A. Schechter, Paul L. Schwab, Josiah We determine the most likely dark-matter fraction in the elliptical galaxy quadruply lensing the quasar PG 1115+080 based on analyses of the X-ray fluxes of the individual images in 2000 and 2008. Between the two epochs, the A[subscript 2] image of PG 1115+080 brightened relative to the other images by a factor of 6 in X-rays. We argue that the A[subscript 2] image had been highly demagnified in 2000 by stellar microlensing in the intervening galaxy and has recently crossed a caustic, thereby creating a new pair of microimages and brightening in the process. Over the same period, the A[subscript 2] image has brightened by a factor of only 1.2 in the optical. The most likely ratio of smooth material (dark matter) to clumpy material (stars) in the lensing galaxy to explain the observations is ~90% of the matter in a smooth dark-matter component and ~10% in stars. 2010-03-17T13:36:13Z 2010-03-17T13:36:13Z 2009-05 2008-08 Article http://purl.org/eprint/type/JournalArticle 1538-4357 0004-637X http://hdl.handle.net/1721.1/52645 Pooley, D. et al. “THE DARK-MATTER FRACTION IN THE ELLIPTICAL GALAXY LENSING THE QUASAR PG 1115+080.” The Astrophysical Journal 697.2 (2009): 1892. © 2009 The American Astronomical Society https://orcid.org/0000-0002-5665-4172 https://orcid.org/0000-0003-3182-5569 en_US http://dx.doi.org/10.1088/0004-637X/697/2/1892 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 American Astronomical Society S. Rappaport |
| spellingShingle | Pooley, D. Blackburne, Jeffrey A. Schechter, Paul L. Wambsganss, J. Rappaport, Saul A Schwab, J. THE DARK-MATTER FRACTION IN THE ELLIPTICAL GALAXY LENSING THE QUASAR PG 1115+080 |
| title | THE DARK-MATTER FRACTION IN THE ELLIPTICAL GALAXY LENSING THE QUASAR PG 1115+080 |
| title_full | THE DARK-MATTER FRACTION IN THE ELLIPTICAL GALAXY LENSING THE QUASAR PG 1115+080 |
| title_fullStr | THE DARK-MATTER FRACTION IN THE ELLIPTICAL GALAXY LENSING THE QUASAR PG 1115+080 |
| title_full_unstemmed | THE DARK-MATTER FRACTION IN THE ELLIPTICAL GALAXY LENSING THE QUASAR PG 1115+080 |
| title_short | THE DARK-MATTER FRACTION IN THE ELLIPTICAL GALAXY LENSING THE QUASAR PG 1115+080 |
| title_sort | dark matter fraction in the elliptical galaxy lensing the quasar pg 1115 080 |
| url | http://hdl.handle.net/1721.1/52645 https://orcid.org/0000-0002-5665-4172 https://orcid.org/0000-0003-3182-5569 |
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