Characteristics of EGRET blazars in the VLBA Imaging and Polarimetry Survey (VIPS)
We examine the radio properties of EGRET-detected blazars observed as part of the VLBA Imaging and Polarimetry Survey (VIPS). VIPS has a flux limit roughly an order of magnitude below the MOJAVE survey and most other samples that have been used to study the properties of EGRET blazars. At lower flux...
| Main Authors: | , , , , , , , , , , , , , , |
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| 格式: | Journal article |
| 语言: | English |
| 出版: |
Institute of Physics Publishing
2007
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| _version_ | 1826266640388456448 |
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| author | Taylor, G Healey, SE Helmboldt, J Tremblay, S Fassnacht, C Walker, R Sjouwerman, L Pearson, T Readhead, A Weintraub, L Gehrels, N Romani, R Michelson, P Blandford, R Cotter, G |
| author_facet | Taylor, G Healey, SE Helmboldt, J Tremblay, S Fassnacht, C Walker, R Sjouwerman, L Pearson, T Readhead, A Weintraub, L Gehrels, N Romani, R Michelson, P Blandford, R Cotter, G |
| author_sort | Taylor, G |
| collection | OXFORD |
| description | We examine the radio properties of EGRET-detected blazars observed as part of the VLBA Imaging and Polarimetry Survey (VIPS). VIPS has a flux limit roughly an order of magnitude below the MOJAVE survey and most other samples that have been used to study the properties of EGRET blazars. At lower flux levels, radio flux density does not directly correlate with gamma-ray flux density. We do find that the EGRET-detected blazars tend to have higher brightness temperatures, greater core fractions, and possibly larger than average jet opening angles. A weak correlation is also found with jet length and with polarization. All of the well-established trends can be explained by systematically larger Doppler factors in the gamma-ray-loud blazars, consistent with the measurements of higher apparent velocities found in monitoring programs carried out at radio frequencies above 10 GHz. © 2007. The American Astronomical Society. All rights reserved. |
| first_indexed | 2024-03-06T20:42:00Z |
| format | Journal article |
| id | oxford-uuid:3497f6b8-4585-42c9-8b1f-42fbd711349b |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T20:42:00Z |
| publishDate | 2007 |
| publisher | Institute of Physics Publishing |
| record_format | dspace |
| spelling | oxford-uuid:3497f6b8-4585-42c9-8b1f-42fbd711349b2022-03-26T13:27:00ZCharacteristics of EGRET blazars in the VLBA Imaging and Polarimetry Survey (VIPS)Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:3497f6b8-4585-42c9-8b1f-42fbd711349bEnglishSymplectic Elements at OxfordInstitute of Physics Publishing2007Taylor, GHealey, SEHelmboldt, JTremblay, SFassnacht, CWalker, RSjouwerman, LPearson, TReadhead, AWeintraub, LGehrels, NRomani, RMichelson, PBlandford, RCotter, GWe examine the radio properties of EGRET-detected blazars observed as part of the VLBA Imaging and Polarimetry Survey (VIPS). VIPS has a flux limit roughly an order of magnitude below the MOJAVE survey and most other samples that have been used to study the properties of EGRET blazars. At lower flux levels, radio flux density does not directly correlate with gamma-ray flux density. We do find that the EGRET-detected blazars tend to have higher brightness temperatures, greater core fractions, and possibly larger than average jet opening angles. A weak correlation is also found with jet length and with polarization. All of the well-established trends can be explained by systematically larger Doppler factors in the gamma-ray-loud blazars, consistent with the measurements of higher apparent velocities found in monitoring programs carried out at radio frequencies above 10 GHz. © 2007. The American Astronomical Society. All rights reserved. |
| spellingShingle | Taylor, G Healey, SE Helmboldt, J Tremblay, S Fassnacht, C Walker, R Sjouwerman, L Pearson, T Readhead, A Weintraub, L Gehrels, N Romani, R Michelson, P Blandford, R Cotter, G Characteristics of EGRET blazars in the VLBA Imaging and Polarimetry Survey (VIPS) |
| title | Characteristics of EGRET blazars in the VLBA Imaging and Polarimetry Survey (VIPS) |
| title_full | Characteristics of EGRET blazars in the VLBA Imaging and Polarimetry Survey (VIPS) |
| title_fullStr | Characteristics of EGRET blazars in the VLBA Imaging and Polarimetry Survey (VIPS) |
| title_full_unstemmed | Characteristics of EGRET blazars in the VLBA Imaging and Polarimetry Survey (VIPS) |
| title_short | Characteristics of EGRET blazars in the VLBA Imaging and Polarimetry Survey (VIPS) |
| title_sort | characteristics of egret blazars in the vlba imaging and polarimetry survey vips |
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