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Title: HERSCHEL PACS AND SPIRE OBSERVATIONS OF BLAZAR PKS 1510-089: A CASE FOR TWO BLAZAR ZONES

Abstract

We present the results of observations of blazar PKS 1510-089 with the Herschel Space Observatory PACS and SPIRE instruments, together with multiwavelength data from Fermi/LAT, Swift, SMARTS, and Submillimeter Array. The source was found in a quiet state, and its far-infrared spectrum is consistent with a power law with a spectral index of {alpha} {approx_equal} 0.7. Our Herschel observations were preceded by two 'orphan' gamma-ray flares. The near-infrared data reveal the high-energy cutoff in the main synchrotron component, which cannot be associated with the main gamma-ray component in a one-zone leptonic model. This is because in such a model the luminosity ratio of the external-Compton (EC) and synchrotron components is tightly related to the frequency ratio of these components, and in this particular case an unrealistically high energy density of the external radiation would be implied. Therefore, we consider a well-constrained two-zone blazar model to interpret the entire data set. In this framework, the observed infrared emission is associated with the synchrotron component produced in the hot-dust region at the supra-parsec scale, while the gamma-ray emission is associated with the EC component produced in the broad-line region at the sub-parsec scale. In addition, the optical/UV emission is associated with themore » accretion disk thermal emission, with the accretion disk corona likely contributing to the X-ray emission.« less

Authors:
 [1];  [2]; ;  [3];  [4];  [5]; ;  [6]
  1. University of Colorado, UCB 440, Boulder, CO 80309 (United States)
  2. Nicolaus Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw (Poland)
  3. Kavli Institute for Particle Astrophysics and Cosmology, SLAC National Accelerator Laboratory, Stanford University, 2575 Sand Hill Road M/S 29, Menlo Park, CA 94025 (United States)
  4. Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200 D, B-3001 Leuven (Belgium)
  5. Nicolaus Copernicus Astronomical Center, Rabianska 8, 87-100, Torun (Poland)
  6. Herschel Science Centre, ESAC, P.O. Box 78, E-28691 Villanueva de la Canada, Madrid (Spain)
Publication Date:
OSTI Identifier:
22086267
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 760; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCRETION DISKS; ASTRONOMY; ASTROPHYSICS; COMPTON EFFECT; COSMIC DUST; ENERGY DENSITY; GALAXIES; GAMMA RADIATION; INFRARED SPECTRA; JETS; LUMINOSITY; PHOTON EMISSION; QUASARS; STELLAR FLARES; SYNCHROTRON RADIATION; X RADIATION

Citation Formats

Nalewajko, Krzysztof, Sikora, Marek, Madejski, Greg M, Szostek, Anna, Exter, Katrina, Szczerba, Ryszard, Kidger, Mark R, and Lorente, Rosario. HERSCHEL PACS AND SPIRE OBSERVATIONS OF BLAZAR PKS 1510-089: A CASE FOR TWO BLAZAR ZONES. United States: N. p., 2012. Web. doi:10.1088/0004-637X/760/1/69.
Nalewajko, Krzysztof, Sikora, Marek, Madejski, Greg M, Szostek, Anna, Exter, Katrina, Szczerba, Ryszard, Kidger, Mark R, & Lorente, Rosario. HERSCHEL PACS AND SPIRE OBSERVATIONS OF BLAZAR PKS 1510-089: A CASE FOR TWO BLAZAR ZONES. United States. https://doi.org/10.1088/0004-637X/760/1/69
Nalewajko, Krzysztof, Sikora, Marek, Madejski, Greg M, Szostek, Anna, Exter, Katrina, Szczerba, Ryszard, Kidger, Mark R, and Lorente, Rosario. Tue . "HERSCHEL PACS AND SPIRE OBSERVATIONS OF BLAZAR PKS 1510-089: A CASE FOR TWO BLAZAR ZONES". United States. https://doi.org/10.1088/0004-637X/760/1/69.
@article{osti_22086267,
title = {HERSCHEL PACS AND SPIRE OBSERVATIONS OF BLAZAR PKS 1510-089: A CASE FOR TWO BLAZAR ZONES},
author = {Nalewajko, Krzysztof and Sikora, Marek and Madejski, Greg M and Szostek, Anna and Exter, Katrina and Szczerba, Ryszard and Kidger, Mark R and Lorente, Rosario},
abstractNote = {We present the results of observations of blazar PKS 1510-089 with the Herschel Space Observatory PACS and SPIRE instruments, together with multiwavelength data from Fermi/LAT, Swift, SMARTS, and Submillimeter Array. The source was found in a quiet state, and its far-infrared spectrum is consistent with a power law with a spectral index of {alpha} {approx_equal} 0.7. Our Herschel observations were preceded by two 'orphan' gamma-ray flares. The near-infrared data reveal the high-energy cutoff in the main synchrotron component, which cannot be associated with the main gamma-ray component in a one-zone leptonic model. This is because in such a model the luminosity ratio of the external-Compton (EC) and synchrotron components is tightly related to the frequency ratio of these components, and in this particular case an unrealistically high energy density of the external radiation would be implied. Therefore, we consider a well-constrained two-zone blazar model to interpret the entire data set. In this framework, the observed infrared emission is associated with the synchrotron component produced in the hot-dust region at the supra-parsec scale, while the gamma-ray emission is associated with the EC component produced in the broad-line region at the sub-parsec scale. In addition, the optical/UV emission is associated with the accretion disk thermal emission, with the accretion disk corona likely contributing to the X-ray emission.},
doi = {10.1088/0004-637X/760/1/69},
url = {https://www.osti.gov/biblio/22086267}, journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 760,
place = {United States},
year = {2012},
month = {11}
}

Works referencing / citing this record:

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Two-zone Emission Modeling of PKS 1510-089 during the High State of 2015
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