PROBING THE OUTSKIRTS OF THE EARLY-STAGE GALAXY CLUSTER MERGER A1750
We present results from recent Suzaku and Chandra X-ray and Multiple Mirrior Telescope optical observations of the strongly merging "double cluster" A1750 out to its virial radius, both along and perpendicular to a putative large-scale structure filament. Some previous studies of individua...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Other Authors: | |
| Format: | Article |
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American Astronomical Society/IOP Publishing
2018
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| Online Access: | http://hdl.handle.net/1721.1/114227 https://orcid.org/0000-0002-1379-4482 |
| _version_ | 1826195404179374080 |
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| author | Bulbul, Esra Randall, Scott W. Bayliss, Matthew Miller, Eric Andrade-Santos, Felipe Johnson, Ryan Blanton, Elizabeth L. Forman, William R. Jones, Christine Paterno-Mahler, Rachel Murray, Stephen S. Sarazin, Craig L. Smith, Randall K. Ezer, Cemile Miller, Eric D Bautz, Marshall W. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Bulbul, Esra Randall, Scott W. Bayliss, Matthew Miller, Eric Andrade-Santos, Felipe Johnson, Ryan Blanton, Elizabeth L. Forman, William R. Jones, Christine Paterno-Mahler, Rachel Murray, Stephen S. Sarazin, Craig L. Smith, Randall K. Ezer, Cemile Miller, Eric D Bautz, Marshall W. |
| author_sort | Bulbul, Esra |
| collection | MIT |
| description | We present results from recent Suzaku and Chandra X-ray and Multiple Mirrior Telescope optical observations of the strongly merging "double cluster" A1750 out to its virial radius, both along and perpendicular to a putative large-scale structure filament. Some previous studies of individual clusters have found evidence for ICM entropy profiles that flatten at large cluster radii, as compared with the self-similar prediction based on purely gravitational models of hierarchical cluster formation, and gas fractions that rise above the mean cosmic value. Weakening accretion shocks and the presence of unresolved cool gas clumps, both of which are expected to correlate with large-scale structure filaments, have been invoked to explain these results. In the outskirts of A1750, we find entropy profiles that are consistent with self-similar expectations, and gas fractions that are consistent with the mean cosmic value, both along and perpendicular to the putative large-scale filament. Thus, we find no evidence for gas clumping in the outskirts of A1750, in either direction. This may indicate that gas clumping is less common in lower temperature (kT ap; 4 keV), less massive systems, consistent with some (but not all) previous studies of low-mass clusters and groups. Cluster mass may, therefore, play a more important role in gas clumping than dynamical state. Finally, we find evidence for diffuse, cool ( < 1 keV) gas at large cluster radii (R 200 ) along the filament, which is consistent with the expected properties of the denser, hotter phase of the warm-hot intergalactic medium. Key words: galaxies: clusters: individual (A1750); large-scale structure of universe; X-rays: galaxies: clusters |
| first_indexed | 2024-09-23T10:12:07Z |
| format | Article |
| id | mit-1721.1/114227 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T10:12:07Z |
| publishDate | 2018 |
| publisher | American Astronomical Society/IOP Publishing |
| record_format | dspace |
| spelling | mit-1721.1/1142272022-09-26T16:25:36Z PROBING THE OUTSKIRTS OF THE EARLY-STAGE GALAXY CLUSTER MERGER A1750 Bulbul, Esra Randall, Scott W. Bayliss, Matthew Miller, Eric Andrade-Santos, Felipe Johnson, Ryan Blanton, Elizabeth L. Forman, William R. Jones, Christine Paterno-Mahler, Rachel Murray, Stephen S. Sarazin, Craig L. Smith, Randall K. Ezer, Cemile Miller, Eric D Bautz, Marshall W. Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research Miller, Eric D Bautz, Marshall W We present results from recent Suzaku and Chandra X-ray and Multiple Mirrior Telescope optical observations of the strongly merging "double cluster" A1750 out to its virial radius, both along and perpendicular to a putative large-scale structure filament. Some previous studies of individual clusters have found evidence for ICM entropy profiles that flatten at large cluster radii, as compared with the self-similar prediction based on purely gravitational models of hierarchical cluster formation, and gas fractions that rise above the mean cosmic value. Weakening accretion shocks and the presence of unresolved cool gas clumps, both of which are expected to correlate with large-scale structure filaments, have been invoked to explain these results. In the outskirts of A1750, we find entropy profiles that are consistent with self-similar expectations, and gas fractions that are consistent with the mean cosmic value, both along and perpendicular to the putative large-scale filament. Thus, we find no evidence for gas clumping in the outskirts of A1750, in either direction. This may indicate that gas clumping is less common in lower temperature (kT ap; 4 keV), less massive systems, consistent with some (but not all) previous studies of low-mass clusters and groups. Cluster mass may, therefore, play a more important role in gas clumping than dynamical state. Finally, we find evidence for diffuse, cool ( < 1 keV) gas at large cluster radii (R 200 ) along the filament, which is consistent with the expected properties of the denser, hotter phase of the warm-hot intergalactic medium. Key words: galaxies: clusters: individual (A1750); large-scale structure of universe; X-rays: galaxies: clusters National Science Foundation (U.S.) (Grant AST-1009012) 2018-03-19T19:41:23Z 2018-03-19T19:41:23Z 2016-02 2015-09 2018-02-16T14:29:35Z Article http://purl.org/eprint/type/JournalArticle 1538-4357 0004-637X http://hdl.handle.net/1721.1/114227 Bulbul, Esra et al. “PROBING THE OUTSKIRTS OF THE EARLY-STAGE GALAXY CLUSTER MERGER A1750.” The Astrophysical Journal 818, 2 (February 2016): 131 © 2016 The American Astronomical Society https://orcid.org/0000-0002-1379-4482 http://dx.doi.org/10.3847/0004-637X/818/2/131 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/IOP Publishing |
| spellingShingle | Bulbul, Esra Randall, Scott W. Bayliss, Matthew Miller, Eric Andrade-Santos, Felipe Johnson, Ryan Blanton, Elizabeth L. Forman, William R. Jones, Christine Paterno-Mahler, Rachel Murray, Stephen S. Sarazin, Craig L. Smith, Randall K. Ezer, Cemile Miller, Eric D Bautz, Marshall W. PROBING THE OUTSKIRTS OF THE EARLY-STAGE GALAXY CLUSTER MERGER A1750 |
| title | PROBING THE OUTSKIRTS OF THE EARLY-STAGE GALAXY CLUSTER MERGER A1750 |
| title_full | PROBING THE OUTSKIRTS OF THE EARLY-STAGE GALAXY CLUSTER MERGER A1750 |
| title_fullStr | PROBING THE OUTSKIRTS OF THE EARLY-STAGE GALAXY CLUSTER MERGER A1750 |
| title_full_unstemmed | PROBING THE OUTSKIRTS OF THE EARLY-STAGE GALAXY CLUSTER MERGER A1750 |
| title_short | PROBING THE OUTSKIRTS OF THE EARLY-STAGE GALAXY CLUSTER MERGER A1750 |
| title_sort | probing the outskirts of the early stage galaxy cluster merger a1750 |
| url | http://hdl.handle.net/1721.1/114227 https://orcid.org/0000-0002-1379-4482 |
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