Probing Intergalactic Magnetic Fields in the GLAST Era through Pair Echo Emission from TeV Blazars Export

@article{citeulike:3204079, abstract = {More than a dozen blazars are known to be emitters of multi-TeV gamma rays, often with strong and rapid flaring activity. By interacting with photons of the cosmic microwave and infrared backgrounds, these gamma rays inevitably produce electron-positron pairs, which in turn radiate secondary inverse Compton gamma rays in the GeV-TeV range with a characteristic time delay that depends on the properties of the intergalactic magnetic field (IGMF). For sufficiently weak IGMF, such "pair echo" emission may be detectable by the Gamma-ray Large Area Space Telescope (GLAST), providing valuable information on the IGMF. We perform detailed calculations of the time-dependent spectra of pair echos from flaring TeV blazars such as Mrk 501 and PKS 2155-304, taking proper account of the echo geometry and other crucial effects. In some cases, the presence of a weak but non-zero IGMF may enhance the detectability of echos. We discuss the quantitative constraints that can be imposed on the IGMF from GLAST observations, including the case of non-detections.}, archivePrefix = {arXiv}, author = {Murase, Kohta and Takahashi, Keitaro and Inoue, Susumu and Ichiki, Kiyomoto and Nagataki, Shigehiro}, citeulike-article-id = {3204079}, citeulike-linkout-0 = {http://arxiv.org/abs/0806.2829}, citeulike-linkout-1 = {http://arxiv.org/pdf/0806.2829}, day = {4}, eprint = {0806.2829}, keywords = {blazar, halo}, month = {Sep}, posted-at = {2008-09-08 08:36:28}, priority = {5}, title = {Probing Intergalactic Magnetic Fields in the GLAST Era through Pair Echo Emission from TeV Blazars}, url = {http://arxiv.org/abs/0806.2829}, year = {2008} }

TY - JOUR ID - citeulike:3204079 L3 - citeulike-article-id:3204079 N2 - More than a dozen blazars are known to be emitters of multi-TeV gamma rays, often with strong and rapid flaring activity. By interacting with photons of the cosmic microwave and infrared backgrounds, these gamma rays inevitably produce electron-positron pairs, which in turn radiate secondary inverse Compton gamma rays in the GeV-TeV range with a characteristic time delay that depends on the properties of the intergalactic magnetic field (IGMF). For sufficiently weak IGMF, such "pair echo" emission may be detectable by the Gamma-ray Large Area Space Telescope (GLAST), providing valuable information on the IGMF. We perform detailed calculations of the time-dependent spectra of pair echos from flaring TeV blazars such as Mrk 501 and PKS 2155-304, taking proper account of the echo geometry and other crucial effects. In some cases, the presence of a weak but non-zero IGMF may enhance the detectability of echos. We discuss the quantitative constraints that can be imposed on the IGMF from GLAST observations, including the case of non-detections. TI - Probing Intergalactic Magnetic Fields in the GLAST Era through Pair Echo Emission from TeV Blazars KW - blazar KW - halo AU - Murase, Kohta AU - Takahashi, Keitaro AU - Inoue, Susumu AU - Ichiki, Kiyomoto AU - Nagataki, Shigehiro PY - 2008/Sep/04/ UR - http://arxiv.org/abs/0806.2829 ER -