Jet emission in young radio sources: A Fermi large area telescope gamma-ray view
Abstract
We investigate the contribution of the beamed jet component to the high-energy emission in young and compact extragalactic radio sources, focusing for the first time on the γ-ray band. We derive predictions on the γ-ray luminosities associated with the relativistic jet assuming a leptonic radiative model. The high-energy emission is produced via Compton scattering by the relativistic electrons in a spherical region at the considered scales (≲10 kpc). Simulations show a wide range of γ-ray luminosities, with intensities up to ∼10{sup 46}-10{sup 48} erg s{sup –1} depending on the assumed jet parameters. We find a highly linear relation between the simulated X-ray and γ-ray luminosities that can be used to select candidates for γ-ray detection. We compare the simulated luminosity distributions in the radio, X-ray, and γ-ray regimes with observations for the largest sample of X-ray-detected young radio quasars. Our analysis of ∼4-yr Fermi Large Area Telescope (LAT) data does not yield any statistically significant detections. However, the majority of the model-predicted γ-ray fluxes for the sample are near or below the current Fermi-LAT flux threshold and compatible with the derived upper limits. Our study gives constraints on the minimum jet power (L {sub jet,} {sub kin}/L {sub disk} >more »
- Authors:
-
- Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138 (United States)
- Department of Physics, Broida Hall, University of California, Santa Barbara, CA 93107 (United States)
- Institute of Space and Astronautical Science, JAXA, 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa 252-5210 (Japan)
- Scuola Internazionale Superiore di Studi Avanzati (SISSA), via Bonomea, 265-34136 Trieste (Italy)
- Publication Date:
- OSTI Identifier:
- 22348231
- Resource Type:
- Journal Article
- Journal Name:
- Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 780; Journal Issue: 2; 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; COMPARATIVE EVALUATIONS; COMPTON EFFECT; DETECTION; DISTRIBUTION; EMISSION; ENERGY DENSITY; GALAXIES; GAMMA RADIATION; LIMITING VALUES; LUMINOSITY; MAGNETIC FIELDS; QUASARS; RELATIVISTIC RANGE; SPHERICAL CONFIGURATION; TELESCOPES; X RADIATION
Citation Formats
Migliori, G., Siemiginowska, A., Kelly, B. C., Stawarz, Ł., Celotti, A., and Begelman, M. C., E-mail: migliori@cfa.harvard.edu. Jet emission in young radio sources: A Fermi large area telescope gamma-ray view. United States: N. p., 2014.
Web. doi:10.1088/0004-637X/780/2/165.
Migliori, G., Siemiginowska, A., Kelly, B. C., Stawarz, Ł., Celotti, A., & Begelman, M. C., E-mail: migliori@cfa.harvard.edu. Jet emission in young radio sources: A Fermi large area telescope gamma-ray view. United States. https://doi.org/10.1088/0004-637X/780/2/165
Migliori, G., Siemiginowska, A., Kelly, B. C., Stawarz, Ł., Celotti, A., and Begelman, M. C., E-mail: migliori@cfa.harvard.edu. 2014.
"Jet emission in young radio sources: A Fermi large area telescope gamma-ray view". United States. https://doi.org/10.1088/0004-637X/780/2/165.
@article{osti_22348231,
title = {Jet emission in young radio sources: A Fermi large area telescope gamma-ray view},
author = {Migliori, G. and Siemiginowska, A. and Kelly, B. C. and Stawarz, Ł. and Celotti, A. and Begelman, M. C., E-mail: migliori@cfa.harvard.edu},
abstractNote = {We investigate the contribution of the beamed jet component to the high-energy emission in young and compact extragalactic radio sources, focusing for the first time on the γ-ray band. We derive predictions on the γ-ray luminosities associated with the relativistic jet assuming a leptonic radiative model. The high-energy emission is produced via Compton scattering by the relativistic electrons in a spherical region at the considered scales (≲10 kpc). Simulations show a wide range of γ-ray luminosities, with intensities up to ∼10{sup 46}-10{sup 48} erg s{sup –1} depending on the assumed jet parameters. We find a highly linear relation between the simulated X-ray and γ-ray luminosities that can be used to select candidates for γ-ray detection. We compare the simulated luminosity distributions in the radio, X-ray, and γ-ray regimes with observations for the largest sample of X-ray-detected young radio quasars. Our analysis of ∼4-yr Fermi Large Area Telescope (LAT) data does not yield any statistically significant detections. However, the majority of the model-predicted γ-ray fluxes for the sample are near or below the current Fermi-LAT flux threshold and compatible with the derived upper limits. Our study gives constraints on the minimum jet power (L {sub jet,} {sub kin}/L {sub disk} > 0.01) of a potential jet contribution to the X-ray emission in the most compact sources (≲ 1 kpc) and on the particle-to-magnetic field energy density ratio that are in broad agreement with equipartition assumptions.},
doi = {10.1088/0004-637X/780/2/165},
url = {https://www.osti.gov/biblio/22348231},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 780,
place = {United States},
year = {Fri Jan 10 00:00:00 EST 2014},
month = {Fri Jan 10 00:00:00 EST 2014}
}