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A candidate sub-parsec supermassive binary black hole system.

Todd A Boroson1, Tod R Lauer

  • 1National Optical Astronomy Observatory, Tucson, Arizona 85726, USA. tyb@noao.edu

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|March 6, 2009
PubMed
Summary
This summary is machine-generated.

Astronomers discovered a unique quasar, SDSS J153636.22+044127.0, which is likely a binary supermassive black hole system. This finding supports the theory that such systems are common in the universe.

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Area of Science:

  • Astrophysics
  • Cosmology
  • Galaxy Evolution

Background:

  • Galaxy mergers are a primary mechanism for galaxy formation and growth.
  • Most large galaxies are known to host supermassive black holes (SMBHs) at their centers.
  • The prevalence of SMBHs suggests that binary SMBH systems should be common due to galaxy mergers.

Purpose of the Study:

  • To identify and characterize potential binary supermassive black hole systems.
  • To investigate unusual quasar properties that may indicate the presence of a binary SMBH.

Main Methods:

  • Spectroscopic analysis of the quasar SDSS J153636.22+044127.0.
  • Identification of distinct emission and absorption line systems within the quasar's spectrum.
  • Velocity separation analysis of spectral features.

Main Results:

  • The quasar SDSS J153636.22+044127.0 exhibits two broad-line emission systems with a velocity separation of 3,500 km/s.
  • A third system of unresolved absorption lines was detected at an intermediate velocity.
  • These spectral characteristics are unique among all known quasars.

Conclusions:

  • The observed spectral features strongly suggest that SDSS J153636.22+044127.0 is a binary supermassive black hole system.
  • The estimated masses of the black holes are 10^7.3 and 10^8.9 solar masses.
  • The binary system is predicted to have an orbital period of approximately 100 years and a separation of about 0.1 parsec.