Constraints on Blazar Jet Conditions During Gamma-Ray Flaring from Radiative Transfer Modeling
As part of a program to investigate jet flow conditions during GeV gamma-ray flares detected by Fermi, we are using UMRAO multi-frequency, centimeter-band total flux density and linear polarization monitoring observations to constrain radiative transfer models incorporating propagating shocks orient...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2013-12-01
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| Series: | EPJ Web of Conferences |
| Online Access: | http://dx.doi.org/10.1051/epjconf/20136107002 |
| _version_ | 1828952474627604480 |
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| author | Aller Margo F. Hughes Philip A. Aller Hugh D. Hovatta Talvikki |
| author_facet | Aller Margo F. Hughes Philip A. Aller Hugh D. Hovatta Talvikki |
| author_sort | Aller Margo F. |
| collection | DOAJ |
| description | As part of a program to investigate jet flow conditions during GeV gamma-ray flares detected by Fermi, we are using UMRAO multi-frequency, centimeter-band total flux density and linear polarization monitoring observations to constrain radiative transfer models incorporating propagating shocks orientated at an arbitrary angle to the flow direction. We describe the characteristics of the model, illustrate how the data are used to constrain the models, and present results for three program sources with diverse characteristics: PKS 0420-01, OJ 287, and 1156+295. The modeling of the observed spectral behavior yields information on the sense, strength and orientation of the shocks producing the radio-band flaring; on the energy distribution of the radiating particles; and on the observer’s viewing angle with respect to the jet independent of VLBI data. We present evidence that, while a random component dominates the jet magnetic field, a distinguishing feature of those radio events with an associated γ-ray flare is the presence of a weak but non-negligible ordered magnetic field component along the jet axis. |
| first_indexed | 2024-12-14T06:53:12Z |
| format | Article |
| id | doaj.art-a387d40b88c643748443b27dcdf8083a |
| institution | Directory Open Access Journal |
| issn | 2100-014X |
| language | English |
| last_indexed | 2024-12-14T06:53:12Z |
| publishDate | 2013-12-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | EPJ Web of Conferences |
| spelling | doaj.art-a387d40b88c643748443b27dcdf8083a2022-12-21T23:12:49ZengEDP SciencesEPJ Web of Conferences2100-014X2013-12-01610700210.1051/epjconf/20136107002Constraints on Blazar Jet Conditions During Gamma-Ray Flaring from Radiative Transfer ModelingAller Margo F.Hughes Philip A.Aller Hugh D.Hovatta TalvikkiAs part of a program to investigate jet flow conditions during GeV gamma-ray flares detected by Fermi, we are using UMRAO multi-frequency, centimeter-band total flux density and linear polarization monitoring observations to constrain radiative transfer models incorporating propagating shocks orientated at an arbitrary angle to the flow direction. We describe the characteristics of the model, illustrate how the data are used to constrain the models, and present results for three program sources with diverse characteristics: PKS 0420-01, OJ 287, and 1156+295. The modeling of the observed spectral behavior yields information on the sense, strength and orientation of the shocks producing the radio-band flaring; on the energy distribution of the radiating particles; and on the observer’s viewing angle with respect to the jet independent of VLBI data. We present evidence that, while a random component dominates the jet magnetic field, a distinguishing feature of those radio events with an associated γ-ray flare is the presence of a weak but non-negligible ordered magnetic field component along the jet axis.http://dx.doi.org/10.1051/epjconf/20136107002 |
| spellingShingle | Aller Margo F. Hughes Philip A. Aller Hugh D. Hovatta Talvikki Constraints on Blazar Jet Conditions During Gamma-Ray Flaring from Radiative Transfer Modeling EPJ Web of Conferences |
| title | Constraints on Blazar Jet Conditions During Gamma-Ray Flaring from Radiative Transfer Modeling |
| title_full | Constraints on Blazar Jet Conditions During Gamma-Ray Flaring from Radiative Transfer Modeling |
| title_fullStr | Constraints on Blazar Jet Conditions During Gamma-Ray Flaring from Radiative Transfer Modeling |
| title_full_unstemmed | Constraints on Blazar Jet Conditions During Gamma-Ray Flaring from Radiative Transfer Modeling |
| title_short | Constraints on Blazar Jet Conditions During Gamma-Ray Flaring from Radiative Transfer Modeling |
| title_sort | constraints on blazar jet conditions during gamma ray flaring from radiative transfer modeling |
| url | http://dx.doi.org/10.1051/epjconf/20136107002 |
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