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Title: The youngest known X-ray binary: Circinus X-1 and its natal supernova remnant

Because supernova remnants are short-lived, studies of neutron star X-ray binaries within supernova remnants probe the earliest stages in the life of accreting neutron stars. However, such objects are exceedingly rare: none were known to exist in our Galaxy. We report the discovery of the natal supernova remnant of the accreting neutron star Circinus X-1, which places an upper limit of t < 4600 yr on its age, making it the youngest known X-ray binary and a unique tool to study accretion, neutron star evolution, and core-collapse supernovae. This discovery is based on a deep 2009 Chandra X-ray observation and new radio observations of Circinus X-1. Circinus X-1 produces type I X-ray bursts on the surface of the neutron star, indicating that the magnetic field of the neutron star is small. Thus, the young age implies either that neutron stars can be born with low magnetic fields or that they can rapidly become de-magnetized by accretion. Circinus X-1 is a microquasar, creating relativistic jets that were thought to power the arcminute-scale radio nebula surrounding the source. Instead, this nebula can now be attributed to non-thermal synchrotron emission from the forward shock of the supernova remnant. The young age is consistentmore » with the observed rapid orbital evolution and the highly eccentric orbit of the system and offers the chance to test the physics of post-supernova orbital evolution in X-ray binaries in detail for the first time.« less
Authors:
;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ; ;  [7] ; ;  [8]
  1. Department of Astronomy, University of Wisconsin-Madison, Madison, WI 53706 (United States)
  2. Sub-department of Astrophysics, University of Oxford, Oxford OX1 3RH (United Kingdom)
  3. SRON, Netherlands Institute for Space Research, 3584-CA, Utrecht (Netherlands)
  4. Department of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802 (United States)
  5. Department of Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ (United Kingdom)
  6. Australia Telescope National Facility, CSIRO, Epping, NSW 1710 (Australia)
  7. Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139 (United States)
  8. Astronomical Institute "Anton Pannekoek," University of Amsterdam, 1090-GE Amsterdam (Netherlands)
Publication Date:
OSTI Identifier:
22348385
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 779; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BINARY STARS; EMISSION; EVOLUTION; GALAXIES; MAGNETIC FIELDS; NEBULAE; NEUTRON STARS; NEUTRONS; RELATIVISTIC RANGE; SUPERNOVA REMNANTS; SUPERNOVAE; SURFACES; X RADIATION