Detection of Superluminal Motion in the X-Ray Jet of M87

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dc.contributor.authorSnios, Bradford
dc.contributor.authorNulsen, Paul. E. J.
dc.contributor.authorKraft, Ralph P.
dc.contributor.authorCheung, C. C.
dc.contributor.authorMeyer, Eileen T.
dc.contributor.authorForman, William R.
dc.contributor.authorJones, Christine
dc.contributor.authorMurray, Stephen S.
dc.date.accessioned2019-10-08T14:34:52Z
dc.date.available2019-10-08T14:34:52Z
dc.date.issued2019-06-26
dc.description.abstractChandra 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 jeten_US
dc.description.sponsorshipSupport 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.urihttps://iopscience.iop.org/article/10.3847/1538-4357/ab2119en_US
dc.format.extent9 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2khft-sosq
dc.identifier.citationBradford 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/ab2119en_US
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ab2119
dc.identifier.urihttp://hdl.handle.net/11603/14977
dc.language.isoen_USen_US
dc.publisherThe American Astronomical Societyen_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Physics Department Collection
dc.relation.ispartofUMBC Faculty Collection
dc.relation.ispartofUMBC Center for Space Sciences and Technology (CSST) / Center for Research and Exploration in Space Sciences & Technology II (CRSST II)
dc.rightsThis 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.rightsThis 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.rightsPublic Domain Mark 1.0
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/
dc.subjectgalaxies: activeen_US
dc.subjectgalaxies: individual (M87)en_US
dc.subjectgalaxies: jetsen_US
dc.subjectX-rays: galaxiesen_US
dc.titleDetection of Superluminal Motion in the X-Ray Jet of M87en_US
dc.typeTexten_US

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