A ray-tracing algorithm for spinning compact object spacetimes with arbitrary quadrupole moments. I. Quasi-kerr black holes

Dimitrios Psaltis, Tim Johannsen

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

We describe a new numerical algorithm for ray tracing in the external spacetimes of spinning compact objects characterized by arbitrary quadrupole moments. Such spacetimes describe non-Kerr vacuum solutions that can be used to test the no-hair theorem in conjunction with observations of accreting black holes. They are also appropriate for neutron stars with spin frequencies in the ≃ 300-600 Hz range, which are typical of the bursting sources in low-mass X-ray binaries. We use our algorithm to show that allowing for the quadrupole moment of the spacetime to take arbitrary values leads to observable effects in the profiles of relativistic broadened fluorescent iron lines from geometrically thin accretion disks.

Original languageEnglish (US)
Article number1
JournalAstrophysical Journal
Volume745
Issue number1
DOIs
StatePublished - Jan 20 2012

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ray tracing
metal spinning
quadrupoles
moments
hair
accretion disks
neutron stars
theorems
accretion
iron
vacuum
profiles
x rays
effect
test

Keywords

  • black hole physics
  • radiative transfer
  • relativistic processes

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

A ray-tracing algorithm for spinning compact object spacetimes with arbitrary quadrupole moments. I. Quasi-kerr black holes. / Psaltis, Dimitrios; Johannsen, Tim.

In: Astrophysical Journal, Vol. 745, No. 1, 1, 20.01.2012.

Research output: Contribution to journalArticle

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