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Title: A luminous gamma-ray binary in the large magellanic cloud

Abstract

Gamma-ray binaries consist of a neutron star or a black hole interacting with a normal star to produce gamma-ray emission that dominates the radiative output of the system. Previously, only a handful of such systems have been discovered, all within our Galaxy. We report the discovery of a luminous gamma-ray binary in the Large Magellanic Cloud, found with the Fermi Large Area Telescope (LAT), from a search for periodic modulation in all sources in the third Fermi LAT catalog. This is the first such system to be found outside the Milky Way. Furthermore, the system has an orbital period of 10.3 days, and is associated with a massive O5III star located in the supernova remnant DEM L241, previously identified as the candidate high-mass X-ray binary (HMXB) CXOU J053600.0–673507. X-ray and radio emission are also modulated on the 10.3 day period, but are in anti-phase with the gamma-ray modulation. Optical radial velocity measurements suggest that the system contains a neutron star. The source is significantly more luminous than similar sources in the Milky Way, at radio, optical, X-ray, and gamma-ray wavelengths. The detection of this extra-galactic system, but no new Galactic systems, raises the possibility that the predicted number of gamma-raymore » binaries in our Galaxy has been overestimated, and that HMXBs may be born containing relatively slowly rotating neutron stars.« less

Authors:
 [1]; ORCiD logo [2];  [3]; ORCiD logo [4]; ORCiD logo [5];  [6];  [7];  [8];  [6]; ORCiD logo [2];  [9];  [10]
  1. Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Maryland Inst. College of Art, Baltimore, MD (United States)
  2. Michigan State Univ., East Lansing, MI (United States). Dept. of Physics and Astronomy
  3. Univ. of Southampton (United Kingdom). School of Physics and Astronomy
  4. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
  5. Univ. of Grenoble (France). Inst. of Planetology nad Astrophysics
  6. Commonwealth Scientific and Industrial Research Organization Astronomy and Space Science, New South Wales (Australia)
  7. Univ. of Toulouse (France). Inst. of Astrophysical Research and Planetology
  8. Univ. of Cape Town (South Africa). Dept. of Astronomy; South African Astronomical Observatory (South Africa)
  9. Univ. of Cape Town (South Africa). Dept. of Astronomy
  10. Warsaw Univ. Observatory (Poland)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1355709
Grant/Contract Number:
AC02-76SF00515
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 829; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; gamma rays: stars; stars: individual (CXOU J053600.0-673507); stars: neutron

Citation Formats

Corbet, R. H. D., Chomiuk, L., Coe, M. J., Coley, J. B., Dubus, G., Edwards, P. G., Martin, P., McBride, V. A., Stevens, J., Strader, J., Townsend, L. J., and Udalski, A. A luminous gamma-ray binary in the large magellanic cloud. United States: N. p., 2016. Web. doi:10.3847/0004-637X/829/2/105.
Corbet, R. H. D., Chomiuk, L., Coe, M. J., Coley, J. B., Dubus, G., Edwards, P. G., Martin, P., McBride, V. A., Stevens, J., Strader, J., Townsend, L. J., & Udalski, A. A luminous gamma-ray binary in the large magellanic cloud. United States. doi:10.3847/0004-637X/829/2/105.
Corbet, R. H. D., Chomiuk, L., Coe, M. J., Coley, J. B., Dubus, G., Edwards, P. G., Martin, P., McBride, V. A., Stevens, J., Strader, J., Townsend, L. J., and Udalski, A. Tue . "A luminous gamma-ray binary in the large magellanic cloud". United States. doi:10.3847/0004-637X/829/2/105. https://www.osti.gov/servlets/purl/1355709.
@article{osti_1355709,
title = {A luminous gamma-ray binary in the large magellanic cloud},
author = {Corbet, R. H. D. and Chomiuk, L. and Coe, M. J. and Coley, J. B. and Dubus, G. and Edwards, P. G. and Martin, P. and McBride, V. A. and Stevens, J. and Strader, J. and Townsend, L. J. and Udalski, A.},
abstractNote = {Gamma-ray binaries consist of a neutron star or a black hole interacting with a normal star to produce gamma-ray emission that dominates the radiative output of the system. Previously, only a handful of such systems have been discovered, all within our Galaxy. We report the discovery of a luminous gamma-ray binary in the Large Magellanic Cloud, found with the Fermi Large Area Telescope (LAT), from a search for periodic modulation in all sources in the third Fermi LAT catalog. This is the first such system to be found outside the Milky Way. Furthermore, the system has an orbital period of 10.3 days, and is associated with a massive O5III star located in the supernova remnant DEM L241, previously identified as the candidate high-mass X-ray binary (HMXB) CXOU J053600.0–673507. X-ray and radio emission are also modulated on the 10.3 day period, but are in anti-phase with the gamma-ray modulation. Optical radial velocity measurements suggest that the system contains a neutron star. The source is significantly more luminous than similar sources in the Milky Way, at radio, optical, X-ray, and gamma-ray wavelengths. The detection of this extra-galactic system, but no new Galactic systems, raises the possibility that the predicted number of gamma-ray binaries in our Galaxy has been overestimated, and that HMXBs may be born containing relatively slowly rotating neutron stars.},
doi = {10.3847/0004-637X/829/2/105},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 829,
place = {United States},
year = {Tue Sep 27 00:00:00 EDT 2016},
month = {Tue Sep 27 00:00:00 EDT 2016}
}

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Cited by: 7works
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  • Gamma-ray binaries consist of a neutron star or a black hole interacting with a normal star to produce gamma-ray emission that dominates the radiative output of the system. Only a handful of such systems have been previously discovered, all within our Galaxy. Here, we report the discovery of a luminous gamma-ray binary in the Large Magellanic Cloud, found with the Fermi Large Area Telescope (LAT), from a search for periodic modulation in all sources in the third Fermi LAT catalog. This is the first such system to be found outside the Milky Way. The system has an orbital period ofmore » 10.3 days, and is associated with a massive O5III star located in the supernova remnant DEM L241, previously identified as the candidate high-mass X-ray binary (HMXB) CXOU J053600.0–673507. X-ray and radio emission are also modulated on the 10.3 day period, but are in anti-phase with the gamma-ray modulation. Optical radial velocity measurements suggest that the system contains a neutron star. The source is significantly more luminous than similar sources in the Milky Way, at radio, optical, X-ray, and gamma-ray wavelengths. The detection of this extra-galactic system, but no new Galactic systems, raises the possibility that the predicted number of gamma-ray binaries in our Galaxy has been overestimated, and that HMXBs may be born containing relatively slowly rotating neutron stars.« less
  • Cited by 24
  • At a distance of 50 kpc and with a dark matter mass of ~10 10 M , the large magellanic cloud (LMC) is a natural target for indirect dark matter searches. We use five years of data from the Fermi Large Area Telescope (LAT) and updated models of the gamma-ray emission from standard astrophysical components to search for a dark matter annihilation signal from the LMC. We perform a rotation curve analysis to determine the dark matter distribution, setting a robust minimum on the amount of dark matter in the LMC, which we use to set conservative bounds on the annihilationmore » cross section. The LMC emission is generally very well described by the standard astrophysical sources, with at most a 1–2σ excess identified near the kinematic center of the LMC once systematic uncertainties are taken into account. As a result, we place competitive bounds on the dark matter annihilation cross section as a function of dark matter particle mass and annihilation channel.« less
  • We report on the results from our deep Chandra observation (120 ks) of the supernova remnant (SNR) N49 and soft gamma-ray repeater (SGR) 0526-66 in the Large Magellanic Cloud. We firmly establish the detection of an ejecta 'bullet' beyond the southwestern boundary of N49. The X-ray spectrum of the bullet is distinguished from that of the main SNR shell, showing significantly enhanced Si and S abundances. We also detect an ejecta feature in the eastern shell, which shows metal overabundances similar to those of the bullet. If N49 was produced by a core-collapse explosion of a massive star, the detectedmore » Si-rich ejecta may represent explosive O-burning or incomplete Si-burning products from deep interior of the SN. On the other hand, the observed Si/S abundance ratio in the ejecta may favor Type Ia origin for N49. We refine the Sedov age of N49, {tau}{sub Sed} {approx} 4800 yr, with the explosion energy E{sub 0} {approx} 1.8 Multiplication-Sign 10{sup 51} erg. Our blackbody (BB) + power law (PL) model for the quiescent X-ray emission from SGR 0526-66 indicates that the PL photon index ({Gamma} {approx} 2.5) is identical to that of PSR 1E1048.1-5937, the well-known candidate transition object between anomalous X-ray pulsars and SGRs. Alternatively, the two-component BB model implies X-ray emission from a small (R {approx} 1 km) hot spot(s) (kT {approx} 1 keV) in addition to emission from the neutron star's cooler surface (R {approx} 10 km, kT {approx} 0.4 keV). There is a considerable discrepancy in the estimated column toward 0526-66 between BB+PL and BB+BB model fits. Discriminating these spectral models would be crucial to test the long-debated physical association between N49 and 0526-66.« less