Detection of Superluminal Motion in the X-Ray Jet of M87
| dc.contributor.author | Snios, Bradford | |
| dc.contributor.author | Nulsen, Paul. E. J. | |
| dc.contributor.author | Kraft, Ralph P. | |
| dc.contributor.author | Cheung, C. C. | |
| dc.contributor.author | Meyer, Eileen T. | |
| dc.contributor.author | Forman, William R. | |
| dc.contributor.author | Jones, Christine | |
| dc.contributor.author | Murray, Stephen S. | |
| dc.date.accessioned | 2019-10-08T14:34:52Z | |
| dc.date.available | 2019-10-08T14:34:52Z | |
| dc.date.issued | 2019-06-26 | |
| dc.description.abstract | Chandra HRC observations are investigated for evidence of proper motion and brightness changes in the X-ray jet of the nearby radio galaxy M87. Using images spanning 5 yr, proper motion is measured in the X-ray knot HST-1, with a superluminal apparent speed of 6.3 ± 0.4c, or 24.1 ± 1.6 mas yr⁻¹ , and in Knot D, with a speed of 2.4 ± 0.6c. Upper limits are placed on the speeds of the remaining jet features. The X-ray knot speeds are in excellent agreement with existing measurements in the radio, optical, and ultraviolet. Comparing the X-ray results with images from the Hubble Space Telescope indicates that the X-ray and optical/UV emitting regions co-move. The X-ray knots also vary by up to 73% in brightness, whereas there is no evidence of brightness changes in the optical/UV. Using the synchrotron cooling models, we determine lower limits on magnetic field strengths of ∼ 420 μG and ∼ 230 μG for HST-1 and Knot A, respectively, consistent with estimates of the equipartition fields. Together, these results lend strong support to the synchrotron cooling model for Knot HST-1, which requires that its superluminal motion reflects the speed of the relativistic bulk flow in the jet | en_US |
| dc.description.sponsorship | Support for this work was provided by the National Aeronautics and Space Administration through Chandra Award Number G07-18104X issued by the Chandra X-ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for and on behalf of the National Aeronautics Space Administration under contract NAS8- 03060. P.E.J.N. and R.P.K. were supported in part by NASA contract NAS8-03060. | en_US |
| dc.description.uri | https://iopscience.iop.org/article/10.3847/1538-4357/ab2119 | en_US |
| dc.format.extent | 9 pages | en_US |
| dc.genre | journal articles | en_US |
| dc.identifier | doi:10.13016/m2khft-sosq | |
| dc.identifier.citation | Bradford Snios, et.al, Detection of Superluminal Motion in the X-Ray Jet of M87, The Astrophysical Journal, Volume 879, Number 1, https://doi.org/10.3847/1538-4357/ab2119 | en_US |
| dc.identifier.uri | https://doi.org/10.3847/1538-4357/ab2119 | |
| dc.identifier.uri | http://hdl.handle.net/11603/14977 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | The American Astronomical Society | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Physics Department Collection | |
| dc.relation.ispartof | UMBC Faculty Collection | |
| dc.relation.ispartof | UMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II) | |
| dc.rights | This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author. | |
| dc.rights | This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law. | |
| dc.rights | Public Domain Mark 1.0 | |
| dc.rights.uri | http://creativecommons.org/publicdomain/mark/1.0/ | |
| dc.subject | galaxies: active | en_US |
| dc.subject | galaxies: individual (M87) | en_US |
| dc.subject | galaxies: jets | en_US |
| dc.subject | X-rays: galaxies | en_US |
| dc.title | Detection of Superluminal Motion in the X-Ray Jet of M87 | en_US |
| dc.type | Text | en_US |