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          Institute: MPI für Kernphysik     Collection: High-Energy Astrophysics     Display Documents

ID: 317875.0, MPI für Kernphysik / High-Energy Astrophysics
Chandra Observations of the Gamma-ray Binary LSI+61303: Extended X-ray Structure?
Authors:Paredes, Josep M.; Ribo, M.; Bosch-Ramon, Valenti; West, Jennifer R.; Butt, Yousaf M.; Torres, Diego F.; Martí, Josep
Date of Publication (YYYY-MM-DD):2007-07-20
Title of Journal:Astrophysical Journal, Part 2 Letters
Journal Abbrev.:ApJL
Issue / Number:1
Start Page:L39
End Page:L42
Review Status:not specified
Audience:Experts Only
Abstract / Description:We present a 50 ks observation of the gamma-ray binary LSI+61303 carried out with the ACIS-I array aboard the Chandra X-ray Observatory. This is the highest resolution X-ray observation of the source conducted so far. Possible evidence of an extended structure at a distance between 5 and 12 arcsec towards the North of LSI+61303 have been found at a significance level of 3.2 sigma. The asymmetry of the extended emission excludes an interpretation in the context of a dust-scattered halo, suggesting an intrinsic nature. On the other hand, while the obtained source flux, of F_{0.3-10 keV}=7.1^{+1.8}_{-1.4} x 10^{-12} ergs/cm2/s, and hydrogen column density, N_{H}=0.70+/-0.06 x 10^{22} cm^{-2}, are compatible with previous results, the photon index Gamma=1.25+/-0.09 is the hardest ever found. In light of these new results, we briefly discuss the physics behind the X-ray emission, the location of the emitter, and the possible origin of the extended emission ~0.1 pc away from LSI+61303.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group of W. Hofmann/High Energy Astrophysics (F. Aharonian)
External Affiliations:Departament d'Astronomia i Meteorologia, Universitat de Barcelona, c/Martí i Franquès 1, 08028 Barcelona, Catalonia, Spain
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
Institució Catalana de Recerca i Estudis Avancats (ICREA) & Institut de Ciències de l'Espai (IEEC-CSIC) Campus UAB, Fac. de Ciències, Torre C5, parell, 2a planta, E-08193 Spain
Departamento de Física, Escuela Politécnica Superior, Universidad de Jaén, Las Lagunillas s/n, Edificio A3, 23071 Jaén, Spain
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