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Title: Multiband Observations of the Quasar PKS 2326–502 during Active and Quiescent Gamma-Ray States in 2010–2012

We present that quasi-simultaneous observations of the Flat Spectrum Radio Quasar PKS 2326-502 were carried out in the γ-ray, X-ray, UV, optical, near-infrared, and radio bands. Using these observations, we are able to characterize the spectral energy distribution (SED) of the source during two flaring and one quiescent γ-ray states. These data were used to constrain one-zone leptonic models of the SEDs of each flare and investigate the physical conditions giving rise to them. While modeling one flare required only changes in the electron spectrum compared to the quiescent state, modeling the other flare required changes in both the electron spectrum and the size of the emitting region. These results are consistent with an emerging pattern of two broad classes of flaring states seen in blazars. Type 1 flares are explained by changes solely in the electron distribution, whereas type 2 flares require a change in an additional parameter. Finally, this suggests that different flares, even in the same source, may result from different physical conditions or different regions in the jet.
Authors:
; ORCiD logo ; ; ; ORCiD logo ; ORCiD logo ; ; ; ; ; ; ORCiD logo ; ; ;
Publication Date:
Grant/Contract Number:
AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 835; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
Fermi LAT Collaboration
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; galaxies: active; gamma rays: galaxies; quasars: individual (PKS 2326–502); radio continuum: galaxies; ultraviolet: galaxies; X-rays: individual (PKS 2326–502)
OSTI Identifier:
1355740

Dutka, Michael S., Carpenter, Bryce D., Ojha, Roopesh, Finke, Justin D., D’Ammando, Filippo, Kadler, Matthias, Edwards, Philip G., Stevens, Jamie, Torresi, Eleonora, Grandi, Paola, Nesci, Roberto, Krauß, Felicia, Müller, Cornelia, Wilms, Joern, and Gehrels, Neil. Multiband Observations of the Quasar PKS 2326–502 during Active and Quiescent Gamma-Ray States in 2010–2012. United States: N. p., Web. doi:10.3847/1538-4357/835/2/182.
Dutka, Michael S., Carpenter, Bryce D., Ojha, Roopesh, Finke, Justin D., D’Ammando, Filippo, Kadler, Matthias, Edwards, Philip G., Stevens, Jamie, Torresi, Eleonora, Grandi, Paola, Nesci, Roberto, Krauß, Felicia, Müller, Cornelia, Wilms, Joern, & Gehrels, Neil. Multiband Observations of the Quasar PKS 2326–502 during Active and Quiescent Gamma-Ray States in 2010–2012. United States. doi:10.3847/1538-4357/835/2/182.
Dutka, Michael S., Carpenter, Bryce D., Ojha, Roopesh, Finke, Justin D., D’Ammando, Filippo, Kadler, Matthias, Edwards, Philip G., Stevens, Jamie, Torresi, Eleonora, Grandi, Paola, Nesci, Roberto, Krauß, Felicia, Müller, Cornelia, Wilms, Joern, and Gehrels, Neil. 2017. "Multiband Observations of the Quasar PKS 2326–502 during Active and Quiescent Gamma-Ray States in 2010–2012". United States. doi:10.3847/1538-4357/835/2/182. https://www.osti.gov/servlets/purl/1355740.
@article{osti_1355740,
title = {Multiband Observations of the Quasar PKS 2326–502 during Active and Quiescent Gamma-Ray States in 2010–2012},
author = {Dutka, Michael S. and Carpenter, Bryce D. and Ojha, Roopesh and Finke, Justin D. and D’Ammando, Filippo and Kadler, Matthias and Edwards, Philip G. and Stevens, Jamie and Torresi, Eleonora and Grandi, Paola and Nesci, Roberto and Krauß, Felicia and Müller, Cornelia and Wilms, Joern and Gehrels, Neil},
abstractNote = {We present that quasi-simultaneous observations of the Flat Spectrum Radio Quasar PKS 2326-502 were carried out in the γ-ray, X-ray, UV, optical, near-infrared, and radio bands. Using these observations, we are able to characterize the spectral energy distribution (SED) of the source during two flaring and one quiescent γ-ray states. These data were used to constrain one-zone leptonic models of the SEDs of each flare and investigate the physical conditions giving rise to them. While modeling one flare required only changes in the electron spectrum compared to the quiescent state, modeling the other flare required changes in both the electron spectrum and the size of the emitting region. These results are consistent with an emerging pattern of two broad classes of flaring states seen in blazars. Type 1 flares are explained by changes solely in the electron distribution, whereas type 2 flares require a change in an additional parameter. Finally, this suggests that different flares, even in the same source, may result from different physical conditions or different regions in the jet.},
doi = {10.3847/1538-4357/835/2/182},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 835,
place = {United States},
year = {2017},
month = {1}
}