RULING OUT IC/CMB X-RAYS IN PKS 0637-752 AND THE IMPLICATIONS FOR TEV EMISSION FROM LARGE-SCALE QUASAR JETS
| dc.contributor.author | Meyer, Eileen T. | |
| dc.contributor.author | Georganopoulos, Markos | |
| dc.contributor.author | Sparks, William B. | |
| dc.contributor.author | Godfrey, Leith | |
| dc.contributor.author | Lovell, James E. J. | |
| dc.contributor.author | Perlman, Eric | |
| dc.date.accessioned | 2020-08-24T15:49:25Z | |
| dc.date.available | 2020-08-24T15:49:25Z | |
| dc.date.issued | 2015-05-28 | |
| dc.description.abstract | The Chandra X-ray observatory has discovered dozens of resolved, kiloparsec-scale jets associated with powerful quasars in which the X-ray fluxes are observed to be much higher than the expected level based on the radio-optical synchrotron spectrum. The most popular explanation for the anomalously high and hard X-ray fluxes is that these jets do not decelerate significantly by the kiloparsec scale, but rather remain highly relativistic (Lorentz factors Γ ∼10). By adopting a small angle to the line-ofsight, the X-rays can thus be explained by inverse Compton upscattering of CMB photons (IC/CMB), where the observed emission is strongly Doppler boosted. Using over six years of Fermi monitoring data, we show that the expected hard, steady gamma-ray emission implied by the IC/CMB model is not seen in PKS 0637-752, the prototype jet for which this model was first proposed. IC/CMB emission is thus ruled out as the source of the X-rays, joining recent results for the jets in 3C 273 (using the same method; Meyer & Georganopoulos 2014) and PKS 1136-135 (using UV polarization; Cara et al. 2013). We further show that the Fermi observations give an upper limit of δ <6.5 for the four brightest X-ray knots of PKS 0637-752, and derive an updated limit of δ <7.8 for knots A and B1 of 3C 273 (assuming equipartition). Finally, we discuss the fact that high levels of synchrotron X-ray emission in a slow jet will unavoidably lead to a level of angle-integrated TeV emission which exceeds that of the TeV BL Lac class. | en_US |
| dc.description.sponsorship | E. T. M. acknowledges Fermi Grant NNX13AO88G. | en_US |
| dc.description.uri | https://iopscience.iop.org/article/10.1088/0004-637X/805/2/154 | en_US |
| dc.format.extent | 8 pages | en_US |
| dc.genre | journal articles preprints | en_US |
| dc.identifier | doi:10.1088/0004-637x/805/2/154 | |
| dc.identifier.citation | Eileen T. Meyer et al., RULING OUT IC/CMB X-RAYS IN PKS 0637-752 AND THE IMPLICATIONS FOR TEV EMISSION FROM LARGE-SCALE QUASAR JETS, The Astrophysical Journal, Volume 805, Number 2 (2015), doi : 10.1088/0004-637x/805/2/154 | |
| dc.identifier.uri | 10.1088/0004-637x/805/2/154 | |
| dc.identifier.uri | http://hdl.handle.net/11603/19493 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | Eileen T. Meyer et al., RULING OUT IC/CMB X-RAYS IN PKS 0637-752 AND THE IMPLICATIONS FOR TEV EMISSION FROM LARGE-SCALE QUASAR JETS, The Astrophysical Journal, Volume 805, Number 2 (2015), doi: 10.1088/0004-637x/805/2/154 | 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 Joint Center for Earth Systems Technology (JCET) | |
| 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 | © 2015. The American Astronomical Society. All rights reserved. | |
| dc.title | RULING OUT IC/CMB X-RAYS IN PKS 0637-752 AND THE IMPLICATIONS FOR TEV EMISSION FROM LARGE-SCALE QUASAR JETS | en_US |
| dc.type | Text | en_US |