skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: EXPLORING THE DARK ACCELERATOR HESS J1745-303 WITH THE FERMI LARGE AREA TELESCOPE

Abstract

We present a detailed analysis of the {gamma}-ray emission from HESS J1745-303 with the data obtained by the Fermi Gamma-ray Space Telescope in its first {approx}29 month observation. The source can clearly be detected at the levels of {approx}18{sigma} and {approx}6{sigma} in 1-20 GeV and 10-20 GeV, respectively. We do not find any evidence of the variability seen in the results obtained by the Compton Gamma-ray Observatory. Most of the emission in 10-20 GeV is found to coincide with region C of HESS J1745-303. A simple power law is sufficient to describe the GeV spectrum with a photon index of {Gamma} {approx} 2.6. The power-law spectrum inferred in the GeV regime can be connected to that of a particular spatial component of HESS J1745-303 in 1-10 TeV without any spectral break. These properties impose independent constraints for understanding the nature of this 'dark particle accelerator'.

Authors:
 [1]; ; ;  [2]; ; ;  [3]
  1. Department of Astronomy and Space Science, Chungnam National University, Daejeon 305-764 (Korea, Republic of)
  2. Department of Physics, University of Hong Kong, Pokfulam Road (Hong Kong)
  3. Institute of Astronomy and Department of Physics, National Tsing Hua University, Hsinchu, Taiwan (China)
Publication Date:
OSTI Identifier:
21578386
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 735; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/735/2/115; Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATORS; COSMIC GAMMA SOURCES; EMISSION; SPECTRA; COSMIC RAY SOURCES

Citation Formats

Hui, C. Y., Wu, E. M. H., Wu, J. H. K., Cheng, K. S., Huang, R. H. H., Tam, P. H. T., and Kong, A. K. H. EXPLORING THE DARK ACCELERATOR HESS J1745-303 WITH THE FERMI LARGE AREA TELESCOPE. United States: N. p., 2011. Web. doi:10.1088/0004-637X/735/2/115.
Hui, C. Y., Wu, E. M. H., Wu, J. H. K., Cheng, K. S., Huang, R. H. H., Tam, P. H. T., & Kong, A. K. H. EXPLORING THE DARK ACCELERATOR HESS J1745-303 WITH THE FERMI LARGE AREA TELESCOPE. United States. doi:10.1088/0004-637X/735/2/115.
Hui, C. Y., Wu, E. M. H., Wu, J. H. K., Cheng, K. S., Huang, R. H. H., Tam, P. H. T., and Kong, A. K. H. Sun . "EXPLORING THE DARK ACCELERATOR HESS J1745-303 WITH THE FERMI LARGE AREA TELESCOPE". United States. doi:10.1088/0004-637X/735/2/115.
@article{osti_21578386,
title = {EXPLORING THE DARK ACCELERATOR HESS J1745-303 WITH THE FERMI LARGE AREA TELESCOPE},
author = {Hui, C. Y. and Wu, E. M. H. and Wu, J. H. K. and Cheng, K. S. and Huang, R. H. H. and Tam, P. H. T. and Kong, A. K. H.},
abstractNote = {We present a detailed analysis of the {gamma}-ray emission from HESS J1745-303 with the data obtained by the Fermi Gamma-ray Space Telescope in its first {approx}29 month observation. The source can clearly be detected at the levels of {approx}18{sigma} and {approx}6{sigma} in 1-20 GeV and 10-20 GeV, respectively. We do not find any evidence of the variability seen in the results obtained by the Compton Gamma-ray Observatory. Most of the emission in 10-20 GeV is found to coincide with region C of HESS J1745-303. A simple power law is sufficient to describe the GeV spectrum with a photon index of {Gamma} {approx} 2.6. The power-law spectrum inferred in the GeV regime can be connected to that of a particular spatial component of HESS J1745-303 in 1-10 TeV without any spectral break. These properties impose independent constraints for understanding the nature of this 'dark particle accelerator'.},
doi = {10.1088/0004-637X/735/2/115},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 735,
place = {United States},
year = {2011},
month = {7}
}