NuSTAR and multifrequency study of the two high-redshift blazars S5 0836+710 and PKS 2149-303
Abstract
Powerful blazars are flat-spectrum radio quasars whose emission is dominated by a Compton component peaking between a few hundred keV and a few hundred MeV. We observed two bright blazars, PKS 2149–306 at redshift z = 2.345 and S5 0836+710 at z = 2.172, in the hard X-ray band with the Nuclear Spectroscopic Telescope Array satellite. Simultaneous soft-X-rays and UV–optical observations were performed with the Swift satellite, while near-infrared (near-IR) data were obtained with the Rapid Eye Mount telescope. To study their variability, we repeated these observations for both sources on a timescale of a few months. While no fast variability was detected during a single observation, both sources were variable in the X-ray band, up to 50%, between the two observations, with larger variability at higher energies. No variability was detected in the optical/NIR band. These data, together with Fermi-Large Area Telescope, Wide-field Infrared Survey Explorer, and other literature data, are then used to study the overall spectral energy distributions (SEDs) of these blazars. Although the jet nonthermal emission dominates the SED, it leaves the UV band unhidden, allowing us to detect the thermal emission of the disk and to estimate the black hole mass. The nonthermal emission ismore »
- Authors:
-
[1];
[3];
[1];
[9];
[4];
- INAF - Osservatoria Astronomico di Brera, Merate (Italy)
- ASI - Science Data Center, Rome (Italy); INAF - Osservatorio Astronomico di Roma, Monteporzio Catone (Italy)
- Univ. of Tokyo, Chiba (Japan)
- California Inst. of Technology (CalTech), Pasadena, CA (United States)
- ASI - Science Data Center, Rome (Italy)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- INAF - Osservatoria Astronomico di Brera, Merate (Italy); Univ. di Milano Bicocca, Milano (Italy)
- Univ. of California, Berkeley, CA (United States)
- Technical Univ. of Denmark, Lyngby (Denmark)
- Technical Univ. of Denmark, Lyngby (Denmark); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- Columbia Univ., New York, NY (United States)
- NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1261113
- Grant/Contract Number:
- AC02-76SF0051
- Resource Type:
- Accepted Manuscript
- Journal Name:
- The Astrophysical Journal (Online)
- Additional Journal Information:
- Journal Name: The Astrophysical Journal (Online); Journal Volume: 807; 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; BL Lacertae objects: individual (PKS 2149-306, S5 0836+710); galaxies: active; galaxies: jets; quasars: general; X-rays: general
Citation Formats
Tagliaferri, Gianpiero, Ghisellini, G., Perri, M., Hayashida, M., Balokovic´, M., Covino, S., Giommi, P., Madejski, G. M., Puccetti, S., Sbarrato, T., Boggs, S. E., Chiang, J., Christensen, F. E., Craig, W. W., Hailey, C. J., Harrison, F. A., Stern, D., and Zhang, W. W. NuSTAR and multifrequency study of the two high-redshift blazars S5 0836+710 and PKS 2149-303. United States: N. p., 2015.
Web. doi:10.1088/0004-637X/807/2/167.
Tagliaferri, Gianpiero, Ghisellini, G., Perri, M., Hayashida, M., Balokovic´, M., Covino, S., Giommi, P., Madejski, G. M., Puccetti, S., Sbarrato, T., Boggs, S. E., Chiang, J., Christensen, F. E., Craig, W. W., Hailey, C. J., Harrison, F. A., Stern, D., & Zhang, W. W. NuSTAR and multifrequency study of the two high-redshift blazars S5 0836+710 and PKS 2149-303. United States. https://doi.org/10.1088/0004-637X/807/2/167
Tagliaferri, Gianpiero, Ghisellini, G., Perri, M., Hayashida, M., Balokovic´, M., Covino, S., Giommi, P., Madejski, G. M., Puccetti, S., Sbarrato, T., Boggs, S. E., Chiang, J., Christensen, F. E., Craig, W. W., Hailey, C. J., Harrison, F. A., Stern, D., and Zhang, W. W. Thu .
"NuSTAR and multifrequency study of the two high-redshift blazars S5 0836+710 and PKS 2149-303". United States. https://doi.org/10.1088/0004-637X/807/2/167. https://www.osti.gov/servlets/purl/1261113.
@article{osti_1261113,
title = {NuSTAR and multifrequency study of the two high-redshift blazars S5 0836+710 and PKS 2149-303},
author = {Tagliaferri, Gianpiero and Ghisellini, G. and Perri, M. and Hayashida, M. and Balokovic´, M. and Covino, S. and Giommi, P. and Madejski, G. M. and Puccetti, S. and Sbarrato, T. and Boggs, S. E. and Chiang, J. and Christensen, F. E. and Craig, W. W. and Hailey, C. J. and Harrison, F. A. and Stern, D. and Zhang, W. W.},
abstractNote = {Powerful blazars are flat-spectrum radio quasars whose emission is dominated by a Compton component peaking between a few hundred keV and a few hundred MeV. We observed two bright blazars, PKS 2149–306 at redshift z = 2.345 and S5 0836+710 at z = 2.172, in the hard X-ray band with the Nuclear Spectroscopic Telescope Array satellite. Simultaneous soft-X-rays and UV–optical observations were performed with the Swift satellite, while near-infrared (near-IR) data were obtained with the Rapid Eye Mount telescope. To study their variability, we repeated these observations for both sources on a timescale of a few months. While no fast variability was detected during a single observation, both sources were variable in the X-ray band, up to 50%, between the two observations, with larger variability at higher energies. No variability was detected in the optical/NIR band. These data, together with Fermi-Large Area Telescope, Wide-field Infrared Survey Explorer, and other literature data, are then used to study the overall spectral energy distributions (SEDs) of these blazars. Although the jet nonthermal emission dominates the SED, it leaves the UV band unhidden, allowing us to detect the thermal emission of the disk and to estimate the black hole mass. The nonthermal emission is well reproduced by a one-zone leptonic model by the synchrotron, self-Compton, and external Compton processes. Our data are better reproduced if we assume that the location of the dissipation region of the jet, Rdiss, is in between the torus and the broad-line region. As a result, the observed variability is explained by changing a minimum number of model parameters by a very small amount.},
doi = {10.1088/0004-637X/807/2/167},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 807,
place = {United States},
year = {Thu Jul 09 00:00:00 EDT 2015},
month = {Thu Jul 09 00:00:00 EDT 2015}
}
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