Accretion disk spectra of super-luminal jet sources and ultra-luminous compact X-ray sources in nearby spiral galaxies

Ken Ebisawa, Aya Kubota, Tsunefumi Mizuno, Piotr Zycki

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The Ultra-luminous Compact X-ray Sources (ULXs) in nearby spiral galaxies and the Galactic super-luminal jet sources share the common spectral characteristic that they have extremely high disk temperatures which cannot be explained in the framework of the standard accretion disk model in the Schwarzschild metric. We have calculated an extreme Kerr disk model to examine if the Kerr disk model can instead explain the observed 'too hot' accretion disk spectra. We found that the Kerr disk spectrum becomes significantly harder compared to the Schwarzschild disk only when the disk is highly inclined. For super-luminal jet sources, which are known to be inclined systems, the Kerr disk model may thus work if we choose proper values for the black hole angular momentum. For the ULXs, however, the Kerr disk interpretation will be problematic, as is is highly unlikely that their accretion disks are preferentially inclined.

Original languageEnglish
Pages (from-to)11-14
Number of pages4
JournalAstrophysics and Space Science
Volume276
Issue numberSUPPL.
DOIs
Publication statusPublished - 2001
Externally publishedYes

Fingerprint

spiral galaxies
accretion disks
accretion
x rays
angular momentum
Schwarzschild metric

Keywords

  • Accretion disk
  • Black hole
  • Relativistic jet
  • X-ray sources

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Accretion disk spectra of super-luminal jet sources and ultra-luminous compact X-ray sources in nearby spiral galaxies. / Ebisawa, Ken; Kubota, Aya; Mizuno, Tsunefumi; Zycki, Piotr.

In: Astrophysics and Space Science, Vol. 276, No. SUPPL., 2001, p. 11-14.

Research output: Contribution to journalArticle

@article{3911b329239d4808890c4abcaac9f126,
title = "Accretion disk spectra of super-luminal jet sources and ultra-luminous compact X-ray sources in nearby spiral galaxies",
abstract = "The Ultra-luminous Compact X-ray Sources (ULXs) in nearby spiral galaxies and the Galactic super-luminal jet sources share the common spectral characteristic that they have extremely high disk temperatures which cannot be explained in the framework of the standard accretion disk model in the Schwarzschild metric. We have calculated an extreme Kerr disk model to examine if the Kerr disk model can instead explain the observed 'too hot' accretion disk spectra. We found that the Kerr disk spectrum becomes significantly harder compared to the Schwarzschild disk only when the disk is highly inclined. For super-luminal jet sources, which are known to be inclined systems, the Kerr disk model may thus work if we choose proper values for the black hole angular momentum. For the ULXs, however, the Kerr disk interpretation will be problematic, as is is highly unlikely that their accretion disks are preferentially inclined.",
keywords = "Accretion disk, Black hole, Relativistic jet, X-ray sources",
author = "Ken Ebisawa and Aya Kubota and Tsunefumi Mizuno and Piotr Zycki",
year = "2001",
doi = "10.1023/A:1011697718976",
language = "English",
volume = "276",
pages = "11--14",
journal = "Astrophysics and Space Science",
issn = "0004-640X",
publisher = "Springer Netherlands",
number = "SUPPL.",

}

TY - JOUR

T1 - Accretion disk spectra of super-luminal jet sources and ultra-luminous compact X-ray sources in nearby spiral galaxies

AU - Ebisawa, Ken

AU - Kubota, Aya

AU - Mizuno, Tsunefumi

AU - Zycki, Piotr

PY - 2001

Y1 - 2001

N2 - The Ultra-luminous Compact X-ray Sources (ULXs) in nearby spiral galaxies and the Galactic super-luminal jet sources share the common spectral characteristic that they have extremely high disk temperatures which cannot be explained in the framework of the standard accretion disk model in the Schwarzschild metric. We have calculated an extreme Kerr disk model to examine if the Kerr disk model can instead explain the observed 'too hot' accretion disk spectra. We found that the Kerr disk spectrum becomes significantly harder compared to the Schwarzschild disk only when the disk is highly inclined. For super-luminal jet sources, which are known to be inclined systems, the Kerr disk model may thus work if we choose proper values for the black hole angular momentum. For the ULXs, however, the Kerr disk interpretation will be problematic, as is is highly unlikely that their accretion disks are preferentially inclined.

AB - The Ultra-luminous Compact X-ray Sources (ULXs) in nearby spiral galaxies and the Galactic super-luminal jet sources share the common spectral characteristic that they have extremely high disk temperatures which cannot be explained in the framework of the standard accretion disk model in the Schwarzschild metric. We have calculated an extreme Kerr disk model to examine if the Kerr disk model can instead explain the observed 'too hot' accretion disk spectra. We found that the Kerr disk spectrum becomes significantly harder compared to the Schwarzschild disk only when the disk is highly inclined. For super-luminal jet sources, which are known to be inclined systems, the Kerr disk model may thus work if we choose proper values for the black hole angular momentum. For the ULXs, however, the Kerr disk interpretation will be problematic, as is is highly unlikely that their accretion disks are preferentially inclined.

KW - Accretion disk

KW - Black hole

KW - Relativistic jet

KW - X-ray sources

UR - http://www.scopus.com/inward/record.url?scp=0012454507&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0012454507&partnerID=8YFLogxK

U2 - 10.1023/A:1011697718976

DO - 10.1023/A:1011697718976

M3 - Article

VL - 276

SP - 11

EP - 14

JO - Astrophysics and Space Science

JF - Astrophysics and Space Science

SN - 0004-640X

IS - SUPPL.

ER -