scholarly journals Ultraluminous X-Ray Sources in External Galaxies

2001 ◽  
Vol 552 (2) ◽  
pp. L109-L112 ◽  
Author(s):  
A. R. King ◽  
M. B. Davies ◽  
M. J. Ward ◽  
G. Fabbiano ◽  
M. Elvis
Keyword(s):  
X Ray ◽  
External Galaxies

scholarly journals H2 Emission from External Galaxies

1992 ◽  
Vol 150 ◽  
pp. 103-107
Author(s):  
Kimiaki Kawara
Keyword(s):  
Uv Radiation ◽  
Supernova Remnants ◽  
Emission Lines ◽  
Hot Stars ◽  
Shock Excitation ◽  
X Ray ◽  
Spectroscopic Observations ◽  
Near Ir ◽  
Bare Nucleus ◽  
External Galaxies

2 μm spectroscopic observations by many authors have revealed significant rotation-vibrational H2 emission is widespread from starburst to bare nucleus galaxies. Near-IR H2 emission lines can arise from various excitation sources: UV radiation by hot stars, shock excitation by supernova remnants or AGN driven winds, and UV/X-ray radiation by an AGN. In this review recent data will be compared with such H2 excitation models.

scholarly journals High-Temperature Chemistry in External Galaxies

2017 ◽  
Vol 13 (S332) ◽  
pp. 25-36 ◽  
Author(s):  
Nanase Harada
Keyword(s):  
Black Holes ◽  
High Temperature ◽  
High Sensitivity ◽  
Cosmic Ray ◽  
Chemical Compositions ◽  
X Ray ◽  
Chemical Models ◽  
External Galaxies ◽  
Nearby Galaxies ◽  
High Temperature Chemistry

AbstractIn external galaxies, some galaxies have higher activities of star formation and central supermassive black holes. The interstellar medium in those galaxies can be heated by different mechanisms such as UV-heating, X-ray heating, cosmic-ray heating, and shock/mechanical heating. Chemical compositions can also be affected by those heating mechanisms. Observations of many molecular species in those nearby galaxies are now possible with the high sensitivity of Atacama Large Millimeter/sub-millimeter Array (ALMA). Here I cover different chemical models for those heating mechanisms. In addition, I present recent ALMA results of extragalactic astrochemistry including our results of a face-on galaxy M83 and an infrared-luminous merger NGC 3256.

Luminous Supersoft X‐Ray Sources in External Galaxies

2003 ◽  
Vol 592 (2) ◽  
pp. 884-899 ◽  
Author(s):  
R. Di Stefano ◽  
A. K. H. Kong
Keyword(s):  
X Ray ◽  
External Galaxies

scholarly journals X-rays from Core-collapse Supernovae

2013 ◽  
Vol 9 (S296) ◽  
pp. 103-107
Author(s):  
David Pooley
Keyword(s):  
Spatial Resolution ◽  
Core Collapse ◽  
X Rays ◽  
Host Galaxies ◽  
X Ray ◽  
The Past ◽  
External Galaxies ◽  
X Ray Binaries

AbstractCore-collapse supernovae can produce X-rays through a variety of mechanisms, which are briefly reviewed. Through a combination of targeted searches of specific supernovae and archival searches for serendipitous coverage of supernovae, the number of known X-ray supernovae has grown by a factor of five in the past 13 years, when the Chandra X-ray Observatory and XMM-Newton were launched. The Swift satellite has contributed greatly to the discovery of X-ray emitted supernovae, but care must taken with all Swift detections given its spatial resolution and the number of X-ray binaries typically seen in external galaxies. About half of the reported Swift detections of X-ray emission from supernovae are in fact not due to the supernovae but from unrelated nearby sources in the host galaxies.

scholarly journals Variability of ultraluminous X-ray sources in the Cartwheel Ring

2006 ◽  
Vol 2 (S238) ◽  
pp. 255-258
Author(s):  
Anna Wolter ◽  
Ginevra Trinchieri ◽  
Monica Colpi
Keyword(s):  
Black Hole ◽  
Star Formation ◽  
Luminosity Function ◽  
High Mass ◽  
High Luminosity ◽  
Intermediate Mass ◽  
X Ray ◽  
External Galaxies ◽  
X Ray Binaries

AbstractThe Cartwheel is one of the most outstanding examples of a dynamically perturbed galaxy where star formation is occurring inside the ring–like structure. In previous studies with Chandra, we detected 16 Ultra Luminous X-ray sources lying along the southern portion of the ring. Their Luminosity Function is consistent with them being in the high luminosity tail of the High Mass X-ray Binaries distribution, but with one exception: source N.10. This source, detected with Chandra at LX = 1 × 1041 erg s−1, is among the brightest non–nuclear sources ever seen in external galaxies. Recently, we have observed the Cartwheel with XMM-Newton in two epochs, six months apart. After having been at its brightest for at least 4 years, the source has dimmed by at least a factor of two between the two observations. This fact implies that the source is compact in nature. Given its extreme isotropic luminosity, there is the possibility that the source hosts an accreting intermediate–mass black hole. Other sources in the ring vary in flux between the different datasets. We discuss our findings in the context of ULX models.

scholarly journals Properties of SS433 and ultraluminous X-ray sources in external galaxies

2005 ◽  
Vol 1 (S230) ◽  
pp. 278-281 ◽  
Author(s):  
S. Fabrika ◽  
S. Karpov ◽  
P. Abolmasov ◽  
O. Sholukhova
Keyword(s):  
X Ray ◽  
External Galaxies

scholarly journals Classifying X‐Ray Sources in External Galaxies from X‐Ray Colors

2003 ◽  
Vol 595 (2) ◽  
pp. 719-726 ◽  
Author(s):  
A. H. Prestwich ◽  
J. A. Irwin ◽  
R. E. Kilgard ◽  
M. I. Krauss ◽  
A. Zezas ◽  
...  
Keyword(s):  
X Ray ◽  
External Galaxies

scholarly journals A catalogue of ultraluminous X-ray sources in external galaxies

2005 ◽  
Vol 429 (3) ◽  
pp. 1125-1129 ◽  
Author(s):  
Q. Z. Liu ◽  
I. F. Mirabel
Keyword(s):  
X Ray ◽  
External Galaxies

scholarly journals The supercritical accretion disk in SS 433 and ultraluminous X-ray sources

2006 ◽  
Vol 2 (S238) ◽  
pp. 225-228
Author(s):  
S. N. Fabrika ◽  
P. K. Abolmasov ◽  
S. Karpov
Keyword(s):  
Accretion Disk ◽  
Accretion Disks ◽  
X Rays ◽  
X Ray ◽  
Ss 433 ◽  
Disk Wind ◽  
Flux Variability ◽  
Typical Time ◽  
Supercritical Accretion ◽  
External Galaxies

AbstractSS 433 is the only known persistent supercritical accretor, it may be very important for understanding ultraluminous X-ray sources (ULXs) located in external galaxies. We describe main properties of the SS 433 supercritical accretion disk and jets. Basing on observational data of SS 433 and published 2D simulations of supercritical accretion disks we estimate parameters of the funnel in the disk/wind of SS 433. We argue that the UV radiation of the SS 433 disk (∼ 50000 K, ∼ 1040erg/s) is roughly isotropic, but X-ray radiation (∼ 107K, ∼ 1040erg/s) of the funnel is mildly anisotropic. A face-on SS 433 object has to be ultraluminous in X-rays (1040–41erg/s). Typical time-scales of the funnel flux variability are estimated. Shallow and very broad (0.1-0.3c) and blue-shifted absorption lines are expected in the funnel X-ray spectrum.

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