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Title: DETECTION OF VHE {gamma}-RAYS FROM HESS J0632+057 DURING THE 2011 FEBRUARY X-RAY OUTBURST WITH THE MAGIC TELESCOPES

Abstract

The very high energy (VHE) {gamma}-ray source HESS J0632+057 has recently been confirmed to be a {gamma}-ray binary. The optical counterpart is the Be star MWC 148, and a compact object of unknown nature orbits it every {approx}321 days with a high eccentricity of {approx}0.8. We monitored HESS J0632+057 with the stereoscopic MAGIC telescopes from 2010 October to 2011 March and detected significant VHE {gamma}-ray emission during 2011 February, when the system exhibited an X-ray outburst. We find no {gamma}-ray signal in the other observation periods when the system did not show increased X-ray flux. Thus, HESS J0632+057 exhibits {gamma}-ray variability on timescales of the order of one to two months possibly linked to the X-ray outburst that takes place about 100 days after the periastron passage. Furthermore, our measurements provide for the first time the {gamma}-ray spectrum down to about 140 GeV and indicate no turnover of the spectrum at low energies. We compare the properties of HESS J0632+057 with the similar {gamma}-ray binary LS I +61 Degree-Sign 303 and discuss the possible origin of the multi-wavelength emission of the source.

Authors:
;  [1]; ; ;  [2]; ;  [3];  [4];  [5]; ; ;  [6];  [7]; ;  [8];  [9];  [10]; ;  [11];  [12] more »; « less
  1. IFAE, Edifici Cn., Campus UAB, E-08193 Bellaterra (Spain)
  2. Grupo de Fisica Altas Energias, Universidad Complutense, E-28040 Madrid (Spain)
  3. INAF National Institute for Astrophysics, I-00136 Rome (Italy)
  4. Dipartimento di Fisica, Universita di Siena and INFN Pisa, I-53100 Siena (Italy)
  5. Technische Universitaet Dortmund, D-44221 Dortmund (Germany)
  6. Max-Planck-Institut fuer Physik, D-80805 Muenchen (Germany)
  7. Dipartimento di Fisica, Universita di Padova and INFN, I-35131 Padova (Italy)
  8. Instituto de Astrofisica de Canarias, E-38200 La Laguna, Tenerife (Spain)
  9. Department of Astrophysics, University of Lodz, PL-90236 Lodz (Poland)
  10. Deutsches Elektronen-Synchrotron (DESY), D-15738 Zeuthen (Germany)
  11. ETH Zurich, CH-8093 Zurich (Switzerland)
  12. Facultat de Fisica, Universitat de Barcelona (ICC/IEEC), E-08028 Barcelona (Spain)
Publication Date:
OSTI Identifier:
22047657
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal Letters
Additional Journal Information:
Journal Volume: 754; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 2041-8205
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; BINARY STARS; COMPARATIVE EVALUATIONS; COSMIC GAMMA SOURCES; GAMMA ASTRONOMY; GAMMA DETECTION; GAMMA RADIATION; GEV RANGE; ORBITS; PHOTON EMISSION; STARS; X RADIATION; X-RAY DETECTION

Citation Formats

Aleksic, J, Blanch, O, Alvarez, E A, Asensio, M, Barrio, J A, Antonelli, L A, Bonnoli, G, Antoranz, P, Backes, M, Barres de Almeida, U, Bock, R K, Borla Tridon, D, Bastieri, D, Becerra Gonzalez, J, Berger, K, Bednarek, W, Bernardini, E, Biland, A, Boller, A, Bosch-Ramon, V, and others, and. DETECTION OF VHE {gamma}-RAYS FROM HESS J0632+057 DURING THE 2011 FEBRUARY X-RAY OUTBURST WITH THE MAGIC TELESCOPES. United States: N. p., 2012. Web. doi:10.1088/2041-8205/754/1/L10.
Aleksic, J, Blanch, O, Alvarez, E A, Asensio, M, Barrio, J A, Antonelli, L A, Bonnoli, G, Antoranz, P, Backes, M, Barres de Almeida, U, Bock, R K, Borla Tridon, D, Bastieri, D, Becerra Gonzalez, J, Berger, K, Bednarek, W, Bernardini, E, Biland, A, Boller, A, Bosch-Ramon, V, & others, and. DETECTION OF VHE {gamma}-RAYS FROM HESS J0632+057 DURING THE 2011 FEBRUARY X-RAY OUTBURST WITH THE MAGIC TELESCOPES. United States. doi:10.1088/2041-8205/754/1/L10.
Aleksic, J, Blanch, O, Alvarez, E A, Asensio, M, Barrio, J A, Antonelli, L A, Bonnoli, G, Antoranz, P, Backes, M, Barres de Almeida, U, Bock, R K, Borla Tridon, D, Bastieri, D, Becerra Gonzalez, J, Berger, K, Bednarek, W, Bernardini, E, Biland, A, Boller, A, Bosch-Ramon, V, and others, and. Fri . "DETECTION OF VHE {gamma}-RAYS FROM HESS J0632+057 DURING THE 2011 FEBRUARY X-RAY OUTBURST WITH THE MAGIC TELESCOPES". United States. doi:10.1088/2041-8205/754/1/L10.
@article{osti_22047657,
title = {DETECTION OF VHE {gamma}-RAYS FROM HESS J0632+057 DURING THE 2011 FEBRUARY X-RAY OUTBURST WITH THE MAGIC TELESCOPES},
author = {Aleksic, J and Blanch, O and Alvarez, E A and Asensio, M and Barrio, J A and Antonelli, L A and Bonnoli, G and Antoranz, P and Backes, M and Barres de Almeida, U and Bock, R K and Borla Tridon, D and Bastieri, D and Becerra Gonzalez, J and Berger, K and Bednarek, W and Bernardini, E and Biland, A and Boller, A and Bosch-Ramon, V and others, and},
abstractNote = {The very high energy (VHE) {gamma}-ray source HESS J0632+057 has recently been confirmed to be a {gamma}-ray binary. The optical counterpart is the Be star MWC 148, and a compact object of unknown nature orbits it every {approx}321 days with a high eccentricity of {approx}0.8. We monitored HESS J0632+057 with the stereoscopic MAGIC telescopes from 2010 October to 2011 March and detected significant VHE {gamma}-ray emission during 2011 February, when the system exhibited an X-ray outburst. We find no {gamma}-ray signal in the other observation periods when the system did not show increased X-ray flux. Thus, HESS J0632+057 exhibits {gamma}-ray variability on timescales of the order of one to two months possibly linked to the X-ray outburst that takes place about 100 days after the periastron passage. Furthermore, our measurements provide for the first time the {gamma}-ray spectrum down to about 140 GeV and indicate no turnover of the spectrum at low energies. We compare the properties of HESS J0632+057 with the similar {gamma}-ray binary LS I +61 Degree-Sign 303 and discuss the possible origin of the multi-wavelength emission of the source.},
doi = {10.1088/2041-8205/754/1/L10},
journal = {Astrophysical Journal Letters},
issn = {2041-8205},
number = 1,
volume = 754,
place = {United States},
year = {2012},
month = {7}
}