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 language | English |
|---|---|
| Pages (from-to) | 11-14 |
| Number of pages | 4 |
| Journal | Astrophysics and Space Science |
| Volume | 276 |
| Issue number | SUPPL. |
| DOIs | |
| Publication status | Published - 2001 |
| Externally published | Yes |
Fingerprint
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 journal › Article
}
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 -