Multiband Observations of the Quasar PKS 2326–502 during Active and Quiescent Gamma-Ray States in 2010–2012
Abstract
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.
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- Contributing Org.:
- Fermi LAT Collaboration
- OSTI Identifier:
- 1355740
- Grant/Contract Number:
- AC02-76SF00515
- Resource 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)
- 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)
Citation Formats
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., 2017.
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. https://doi.org/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. Mon .
"Multiband Observations of the Quasar PKS 2326–502 during Active and Quiescent Gamma-Ray States in 2010–2012". United States. https://doi.org/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 = {Mon Jan 30 00:00:00 EST 2017},
month = {Mon Jan 30 00:00:00 EST 2017}
}
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Works referencing / citing this record:
The large gamma-ray flare of the flat-spectrum radio quasar PKS 0346−27
journal, July 2019
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- Astronomy & Astrophysics, Vol. 627