期刊
ASTRONOMY & ASTROPHYSICS
卷 542, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201218910
关键词
gamma rays: galaxies; galaxies: active; BL Lacertae objects: individual: 1RXS J101015.9-311909
资金
- Erasmus Mundus, External Cooperation Window
- Namibian authorities and of the University of Namibia
- German Ministry for Education and Research (BMBF)
- Max Planck Society
- French Ministry for Research
- CNRS-IN2P3
- Astroparticle Interdisciplinary Programme of the CNRS
- UK Science and Technology Facilities Council (STFC)
- IPNP of the Charles University
- Polish Ministry of Science and Higher Education
- South African Department of Science and Technology
- National Research Foundation
- University of Namibia
- National Aeronautics and Space Administration
- National Science Foundation
- Science and Technology Facilities Council [PP/E001319/1, ST/I001573/1, ST/I505656/1, PP/E001645/2] Funding Source: researchfish
1RXS J101015.9-311909 is a galaxy located at a redshift of z = 0.14 hosting an active nucleus (called AGN) belonging to the class of bright BL Lac objects. Observations at high (HE, E > 100 MeV) and very high (VHE, E > 100 GeV) energies provide insights into the origin of very energetic particles present in such sources and the radiation processes at work. We report on results from VHE observations performed between 2006 and 2010 with the H. E. S. S. instrument, an array of four imaging atmospheric Cherenkov telescopes. H. E. S. S. data have been analysed with enhanced analysis methods, making the detection of faint sources more significant. VHE emission at a position coincident with 1RXS J101015.9-311909 is detected with H. E. S. S. for the first time. In a total good-quality livetime of about 49 h, we measure 263 excess counts, corresponding to a significance of 7.1 standard deviations. The photon spectrum above 0.2 TeV can be described by a power-law with a photon index of Gamma = 3.08 +/- 0.42(stat) +/- 0.20(sys). The integral flux above 0.2 TeV is about 0.8% of the flux of the Crab nebula and shows no significant variability over the time reported. In addition, public Fermi/LAT data are analysed to search for high energy emission from the source. The Fermi/LAT HE emission in the 100 MeV to 200 GeV energy range is significant at 8.3 standard deviations in the chosen 25-month dataset. UV and X-ray contemporaneous observations with the Swift satellite in May 2007 are also reported, together with optical observations performed with the atom telescope located at the H. E. S. S. site. Swift observations reveal an absorbed X-ray flux of F(0.3-7) keV = 1.04(-0.05)(+0.04) x 10(-11) erg cm(-2) s(-1) in the 0.3-7 keV range. Finally, all the available data are used to study the multi-wavelength properties of the source. The spectral energy distribution (SED) can be reproduced using a simple one-zone Synchrotron Self Compton (SSC) model with emission from a region with a Doppler factor of 30 and a magnetic field between 0.025 and 0.16 G. These parameters are similar to those obtained for other sources of this type.
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