scholarly journals Studies of SNRS in the Magellanic Clouds

1991 ◽  
Vol 148 ◽  
pp. 313-313
Author(s):  
A. J. Turtle
Keyword(s):  
Spatial Distribution ◽  
Supernova Remnants ◽  
Thermal Emission ◽  
Magellanic Clouds ◽  
Diameter Distribution ◽  
Radio Luminosity ◽  
Radio Observations ◽  
X Ray

In the Magellanic Clouds about 60 confirmed supernova remnants (SNRs) or candidates are known. They have been detected by a combination of X-ray, optical and radio observations. Various statistical aspects of these SNRs will be considered including the implied supernova rate, the spatial distribution, the implications of the radio luminosity/diameter distribution for SNR evolution, and the relation to the extended non-thermal emission.

Supernova Remnant Searches at Molonglo

1984 ◽  
Vol 5 (4) ◽  
pp. 537-540 ◽  
Author(s):  
A. J. Turtle ◽  
B. Y. Mills
Keyword(s):  
Supernova Remnants ◽  
Supernova Remnant ◽  
Magellanic Clouds ◽  
Radio Observations ◽  
X Ray

A catalogue of 38 supernova remnants (SNRs) identified in the Large and Small Magellanic Clouds from X-ray, optical and radio observations has recently been presented by Mills et al. (1984). One important consideration is the completeness of this catalogue and of the Galactic catalogues with which it is compared. These are currently being investigated.

scholarly journals Detecting shocked intergalactic gas with X-ray and radio observations

2019 ◽  
Vol 627 ◽  
pp. A5 ◽  
Author(s):  
F. Vazza ◽  
S. Ettori ◽  
M. Roncarelli ◽  
M. Angelinelli ◽  
M. Brüggen ◽  
...  
Keyword(s):  
Large Scale ◽  
Intergalactic Medium ◽  
Thermal Emission ◽  
Intergalactic Gas ◽  
Radio Observations ◽  
X Ray ◽  
Large Scale Structures ◽  
Hot Gas ◽  
Scale Structures ◽  
Radio Band

Detecting the thermal and non-thermal emission from the shocked cosmic gas surrounding large-scale structures represents a challenge for observations, as well as a unique window into the physics of the warm-hot intergalactic medium. In this work, we present synthetic radio and X-ray surveys of large cosmological simulations in order to assess the chances of jointly detecting the cosmic web in both frequency ranges. We then propose best observing strategies tailored for existing (LOFAR, MWA, and XMM) or future instruments (SKA-LOW and SKA-MID, Athena, and eROSITA). We find that the most promising targets are the extreme peripheries of galaxy clusters in an early merging stage, where the merger causes the fast compression of warm-hot gas onto the virial region. By taking advantage of a detection in the radio band, future deep X-ray observations will probe this gas in emission, and help us to study plasma conditions in the dynamic warm-hot intergalactic medium with unprecedented detail.

scholarly journals Radio and X-ray Study of SNRs in the Magellanic Clouds

1999 ◽  
Vol 192 ◽  
pp. 104-107
Author(s):  
M.D. Filipović ◽  
W. Pietsch ◽  
G. L. White ◽  
F. Haberl ◽  
L. Staveley-Smith ◽  
...  
Keyword(s):  
High Resolution ◽  
Supernova Remnants ◽  
Magellanic Clouds ◽  
Radio Continuum ◽  
H Ii Regions ◽  
Complete Sample ◽  
X Ray ◽  
Compact Array

We present our high-resolution radio-continuum and X-ray study of supernova remnants (SNRs) in the Magellanic Clouds (MCs). These investigations are based on Australia Telescope Compact Array (ATCA) radio-continuum and ROSAT X-ray observations. Our main aim is to study a complete sample of the MC SNRs and H II regions.

scholarly journals Observational Aspects of Supernova Remnants

1974 ◽  
Vol 60 ◽  
pp. 311-327 ◽  
Author(s):  
B. Y. Mills
Keyword(s):  
Radio Source ◽  
Supernova Remnants ◽  
Galactic Plane ◽  
Great Majority ◽  
Magellanic Clouds ◽  
X Ray ◽  
Yield Information ◽  
Show Evidence ◽  
Good Determination

A supernova event may lead to four observable features: a pulsar, an expanding nebulosity, a radio source and an X-ray source. The great majority of supernovae do not produce observable pulsars, and discussion is restricted largely to the other features. An increasing number of X-ray sources is now being detected and the structure and spectrum of the stronger sources investigated; these observations yield information about the physical state of the remnant. Recently, 11 new optical and radio remnants have been found in the Magellanic Clouds. These have led to a good determination of the Σ – D relation, thus providing a more reliable distance scale for galactic SNR, but have also shown that a one-to-one correspondence between a radio source and a supernova event is questionable. When these remnants are combined with corrected earlier catalogues and a new southern catalogue containing a high proportion of distant old remnants the number of known SNR is about 150. The evolution of galactic SNR may be investigated empirically, and although the derived rate of occurrence is very uncertain a rate of about 2 supernovae per century is consistent with most determinations. The galactic SNR are distributed rather like the radio disc emission, but more closely confined to the galactic plane, and selected SNR show evidence of a spiral pattern.

scholarly journals X-rays from the mode-switching PSR B0943+10

2017 ◽  
Vol 13 (S337) ◽  
pp. 62-65 ◽  
Author(s):  
S. Mereghetti ◽  
L. Kuiper ◽  
A. Tiengo ◽  
J. Hessels ◽  
W. Hermsen ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Thermal Emission ◽  
Mode Switching ◽  
X Rays ◽  
Radio Telescopes ◽  
Polar Cap ◽  
Radio Observations ◽  
X Ray ◽  
First Time

AbstractNew simultaneous X-ray and radio observations of the archetypal mode-switching pulsar PSR B0943+10 have been carried out with XMM-Newton and the LOFAR, LWA and Arecibo radio telescopes in November 2014. They allowed us to better constrain the X-ray spectral and variability properties of this pulsar and to detect, for the first time, the X-ray pulsations also during the X-ray-fainter mode. The combined timing and spectral analysis indicates that unpulsed non-thermal emission, likely of magnetospheric origin, and pulsed thermal emission from a small polar cap are present during both radio modes and vary in a correlated way.

scholarly journals Deep Imaging of SNRs at Low Frequencies Using the GMRT

2002 ◽  
Vol 199 ◽  
pp. 307-308
Author(s):  
Sanjay Bhatnagar
Keyword(s):  
High Resolution ◽  
Supernova Remnants ◽  
Thermal Emission ◽  
Large Range ◽  
High Resolution Imaging ◽  
Radio Observations ◽  
Low Frequencies ◽  
Deep Imaging ◽  
The Galaxy ◽  
Resolution Imaging

Radio observations of large Supernova Remnants (SNRs) in the Galaxy are plagued with the problems of confusion and limitations of synthesis telescopes in imaging the emission at large angular scales. Since most SNRs are brighter at low radio frequencies, and the contamination due to thermal emission is reduced, deep and high resolution imaging of Galactic SNRs at meterwave lengths is most useful in their detection and classification. Relatively high resolution and sensitivity over a large range of angular scales provided by the GMRT at meterwave lengths makes it an ideal instrument for detailed multi-frequency imaging of Galactic SNRs.

scholarly journals Observational limits on the X-ray emission from the bubble nebula surrounding Ho IX X-1

2019 ◽  
Vol 488 (4) ◽  
pp. 4614-4622 ◽  
Author(s):  
Rajath Sathyaprakash ◽  
Timothy P Roberts ◽  
Magdalena M Siwek
Keyword(s):  
Strong Evidence ◽  
Thermal Emission ◽  
High Energy ◽  
Accretion Disc ◽  
Spatial Extent ◽  
X Rays ◽  
Radio Observations ◽  
High Energy Astrophysics ◽  
Photometric Analysis ◽  
X Ray

ABSTRACT Optical and radio observations of shock-ionized bubble nebulae surrounding ultraluminous X-ray sources (ULXs) suggest that they are powered by jets or supercritical outflows presumably launched from the ULX accretion disc. Recent simulations of these systems have shown that the shocked wind can emit thermal X-rays with estimated luminosities ≲1036 erg s−1. In this work, we investigated whether it is possible to detect and spatially resolve the X-ray emission from these systems using archival Chandra observations of the ULX Holmberg IX X-1 (Ho IX X-1). This source is an ideal target to study for two reasons: it is surrounded by an optical bubble nebula with a large spatial extent (∼400 pc) that can easily be resolved with Chandra. Further, it has a hard X-ray continuum that is easily distinguishable from the expected soft thermal emission from the nebula. However, a spectral and photometric analysis on stacked Chandra observations of the source reveals that there is no strong evidence for an X-ray bubble associated with it, to a limiting luminosity of ∼2 × 1036 erg s−1. The detection of such X-ray nebulae may be possible with future X-ray missions such as Advanced Telescope for High ENergy Astrophysics(ATHENA), which would provide useful constraints on the kinematics of the outflow. Finally, our observations also emphasize that the nebular emission does not contribute significantly to the residuals in the X-ray spectrum of the source, which are more likely to be linked to processes localized to the ULX.

scholarly journals Soft X-ray Observation of Supernova Remnants in the Small Magellanic Cloud

1983 ◽  
Vol 101 ◽  
pp. 535-540 ◽  
Author(s):  
H. Inoue ◽  
K. Koyama ◽  
Y. Tanaka
Keyword(s):  
Supernova Remnants ◽  
Magellanic Cloud ◽  
Magellanic Clouds ◽  
X Rays ◽  
Small Magellanic Cloud ◽  
X Ray

The Small and Large Magellanic Clouds (SMC and LMC) are the nearest neighbouring galaxies. Their proximity enables us to investigate these galaxies in X-rays in fair detail.

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