SEARCHING FOR THE 3.5 keV LINE IN THE STACKED SUZAKU OBSERVATIONS OF GALAXY CLUSTERS
We perform a detailed study of the stacked Suzaku observations of 47 galaxy clusters, spanning a redshift range of 0.01–0.45, to search for the unidentified 3.5 keV line. This sample provides an independent test for the previously detected line. We detect a 2σ-significant spectral feature at 3.5 keV...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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IOP Publishing
2017
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| Online Access: | http://hdl.handle.net/1721.1/108042 |
| _version_ | 1826214963892453376 |
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| author | Markevitch, Maxim Foster, Adam Loewenstein, Mike Randall, Scott W. Smith, Randall K. Bulbul, Gul E Miller, Eric D Bautz, Mark |
| author2 | MIT Kavli Institute for Astrophysics and Space Research |
| author_facet | MIT Kavli Institute for Astrophysics and Space Research Markevitch, Maxim Foster, Adam Loewenstein, Mike Randall, Scott W. Smith, Randall K. Bulbul, Gul E Miller, Eric D Bautz, Mark |
| author_sort | Markevitch, Maxim |
| collection | MIT |
| description | We perform a detailed study of the stacked Suzaku observations of 47 galaxy clusters, spanning a redshift range of 0.01–0.45, to search for the unidentified 3.5 keV line. This sample provides an independent test for the previously detected line. We detect a 2σ-significant spectral feature at 3.5 keV in the spectrum of the full sample. When the sample is divided into two subsamples (cool-core and non-cool core clusters), the cool-core subsample shows no statistically significant positive residuals at the line energy. A very weak (~2σ confidence) spectral feature at 3.5 keV is permitted by the data from the non-cool-core clusters sample. The upper limit on a neutrino decay mixing angle of sin[superscript 2](2θ) = 6.1 x 1[superscript -11] from the full Suzaku sample is consistent with the previous detections in the stacked XMM-Newton sample of galaxy clusters (which had a higher statistical sensitivity to faint lines), M31, and Galactic center, at a 90% confidence level. However, the constraint from the present sample, which does not include the Perseus cluster, is in tension with previously reported line flux observed in the core of the Perseus cluster with XMM-Newton and Suzaku. |
| first_indexed | 2024-09-23T16:14:25Z |
| format | Article |
| id | mit-1721.1/108042 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:14:25Z |
| publishDate | 2017 |
| publisher | IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1080422022-10-02T07:13:55Z SEARCHING FOR THE 3.5 keV LINE IN THE STACKED SUZAKU OBSERVATIONS OF GALAXY CLUSTERS Markevitch, Maxim Foster, Adam Loewenstein, Mike Randall, Scott W. Smith, Randall K. Bulbul, Gul E Miller, Eric D Bautz, Mark MIT Kavli Institute for Astrophysics and Space Research Bulbul, Gul E Miller, Eric D Bautz, Mark We perform a detailed study of the stacked Suzaku observations of 47 galaxy clusters, spanning a redshift range of 0.01–0.45, to search for the unidentified 3.5 keV line. This sample provides an independent test for the previously detected line. We detect a 2σ-significant spectral feature at 3.5 keV in the spectrum of the full sample. When the sample is divided into two subsamples (cool-core and non-cool core clusters), the cool-core subsample shows no statistically significant positive residuals at the line energy. A very weak (~2σ confidence) spectral feature at 3.5 keV is permitted by the data from the non-cool-core clusters sample. The upper limit on a neutrino decay mixing angle of sin[superscript 2](2θ) = 6.1 x 1[superscript -11] from the full Suzaku sample is consistent with the previous detections in the stacked XMM-Newton sample of galaxy clusters (which had a higher statistical sensitivity to faint lines), M31, and Galactic center, at a 90% confidence level. However, the constraint from the present sample, which does not include the Perseus cluster, is in tension with previously reported line flux observed in the core of the Perseus cluster with XMM-Newton and Suzaku. United States. National Aeronautics and Space Administration (Contracts NNX14AF78G, NNX13AE77G, and NNX15AC76G) United States. National Aeronautics and Space Administration (Grants NNX13AE77G and NNX15AC76G) 2017-04-11T14:19:39Z 2017-04-11T14:19:39Z 2016-10 2016-07 Article http://purl.org/eprint/type/JournalArticle 1538-4357 http://hdl.handle.net/1721.1/108042 Bulbul, Esra et al. “SEARCHING FOR THE 3.5 keV LINE IN THE STACKED SUZAKU OBSERVATIONS OF GALAXY CLUSTERS.” The Astrophysical Journal 831.1 (2016): 55. © 2016 The American Astronomical Society en_US http://dx.doi.org/10.3847/0004-637x/831/1/55 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 IOP Publishing |
| spellingShingle | Markevitch, Maxim Foster, Adam Loewenstein, Mike Randall, Scott W. Smith, Randall K. Bulbul, Gul E Miller, Eric D Bautz, Mark SEARCHING FOR THE 3.5 keV LINE IN THE STACKED SUZAKU OBSERVATIONS OF GALAXY CLUSTERS |
| title | SEARCHING FOR THE 3.5 keV LINE IN THE STACKED SUZAKU OBSERVATIONS OF GALAXY CLUSTERS |
| title_full | SEARCHING FOR THE 3.5 keV LINE IN THE STACKED SUZAKU OBSERVATIONS OF GALAXY CLUSTERS |
| title_fullStr | SEARCHING FOR THE 3.5 keV LINE IN THE STACKED SUZAKU OBSERVATIONS OF GALAXY CLUSTERS |
| title_full_unstemmed | SEARCHING FOR THE 3.5 keV LINE IN THE STACKED SUZAKU OBSERVATIONS OF GALAXY CLUSTERS |
| title_short | SEARCHING FOR THE 3.5 keV LINE IN THE STACKED SUZAKU OBSERVATIONS OF GALAXY CLUSTERS |
| title_sort | searching for the 3 5 kev line in the stacked suzaku observations of galaxy clusters |
| url | http://hdl.handle.net/1721.1/108042 |
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