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Gravitational Waves and X-Ray Signals from Stellar Disruption by a Massive Black Hole

Kobayashi, Shiho and Laguna, Pablo and Phinney, E. Sterl and Mészáros, Peter (2004) Gravitational Waves and X-Ray Signals from Stellar Disruption by a Massive Black Hole. Astrophysical Journal, 615 (2). pp. 855-865. ISSN 0004-637X.

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Gravitational waves and X-ray flares are expected from tidal disruption of stars by a massive black hole. Using a relativistic smoothed particle hydrodynamics code, we investigate the fate of main-sequence and helium stars in plunge orbits passing near Schwarzschild or Kerr black holes of mass ~10^5-10^6 M☉. We show that quadrupole gravitational waves emitted during the tidal disruption process are described reasonably well by a point-particle approximation even in the strong-encounter case. An additional hydrodynamic calculation based on the Godunov method indicates that shocks develop for sufficiently high tidal compressions. The shock heating results in an X-ray flare, which for solar-type stars disrupted by ~10^6 M☉ black holes is in the keV range associated with the gravitational wave signal. The hardness and duration of the X-ray flare may serve as a diagnostic of the mass of the central black hole.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Kobayashi, Shiho0000-0001-7946-4200
Additional Information:© 2004 The American Astronomical Society. Received 2004 April 7; accepted 2004 July 22. We thank M. Rees, S. Sigurdsson, T. Alexander, S. Mahadevan, and the referee for valuable comments. This work is supported by NASA NAG5-13286, NASA NAG5-10707, NSF AST 00-98416, the Monell Foundation, the Merle Kingsley fund, and the Pennsylvania State University Center for Gravitational Wave Physics, funded under cooperative agreement by NSF PHY 01-14375.
Funding AgencyGrant Number
NSFAST 00-98416
Monell FoundationUNSPECIFIED
Merle Kingsley FundUNSPECIFIED
Pennsylvania State UniversityUNSPECIFIED
NSFPHY 01-14375
Subject Keywords:black hole physics — galaxies: nuclei — gravitational waves — hydrodynamics — X-rays: bursts
Issue or Number:2
Record Number:CaltechAUTHORS:20190205-134552727
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Official Citation:Shiho Kobayashi et al 2004 ApJ 615 855
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92678
Deposited By: Tony Diaz
Deposited On:05 Feb 2019 22:36
Last Modified:09 Mar 2020 13:18

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