scholarly journals X-ray emission from the historical supernovae in the spiral galaxy NGC 6946: SN 1980K and SN 1968D recovered ?

1994 ◽  
Vol 108 ◽  
pp. 1893 ◽  
Author(s):  
E. M. Schlegel
Keyword(s):  
Spiral Galaxy ◽  
X Ray ◽  
Ngc 6946

scholarly journals Hot gaseous atmospheres of rotating galaxies observed with XMM–Newton

2020 ◽  
Vol 499 (4) ◽  
pp. 5163-5174
Author(s):  
A Juráňová ◽  
N Werner ◽  
P E J Nulsen ◽  
M Gaspari ◽  
K Lakhchaura ◽  
...  
Keyword(s):  
Angular Momentum ◽  
Active Galactic Nuclei ◽  
Spiral Galaxy ◽  
Galactic Nuclei ◽  
X Ray ◽  
Hot Gas ◽  
Heating And Cooling ◽  
Theoretical Predictions ◽  
Central Regions ◽  
Gaseous Atmospheres

ABSTRACT X-ray emitting atmospheres of non-rotating early-type galaxies and their connection to central active galactic nuclei have been thoroughly studied over the years. However, in systems with significant angular momentum, processes of heating and cooling are likely to proceed differently. We present an analysis of the hot atmospheres of six lenticulars and a spiral galaxy to study the effects of angular momentum on the hot gas properties. We find an alignment between the hot gas and the stellar distribution, with the ellipticity of the X-ray emission generally lower than that of the optical stellar emission, consistent with theoretical predictions for rotationally supported hot atmospheres. The entropy profiles of NGC 4382 and the massive spiral galaxy NGC 1961 are significantly shallower than the entropy distribution in other galaxies, suggesting the presence of strong heating (via outflows or compressional) in the central regions of these systems. Finally, we investigate the thermal (in)stability of the hot atmospheres via criteria such as the TI- and C-ratio, and discuss the possibility that the discs of cold gas present in these objects have condensed out of the hot atmospheres.

scholarly journals Studying the contribution of components and type of spiral galaxy NGC 6946 using digital image processing

2019 ◽  
Vol 13 (28) ◽  
pp. 27-32
Author(s):  
A. K. Ahmed
Keyword(s):  
Spiral Galaxy ◽  
Rough Sets ◽  
Essential Element ◽  
National Research Institute ◽  
Astronomical Image ◽  
Ngc 6946 ◽  
Time Required ◽  
Variable Precision Rough Sets ◽  
Source Of Information ◽  
Classified Image

NGC 6946 have been observed with BVRI filters, on October 15-18,2012, with the Newtonian focus of the 1.88m telescope, Kottamiaobservatory, of the National Research Institute of Astronomy andGeophysics, Egypt (NRIAG), then we combine the BVRI filters toobtain an astronomical image to the spiral galaxy NGC 6946 whichis regarded main source of information to discover the components ofthis galaxy, where galaxies are considered the essential element ofthe universe. To know the components of NGC 6946, we studied itwith the Variable Precision Rough Sets technique to determine thecontribution of the Bulge, disk, and arms of NGC 6946 according todifferent color in the image. From image we can determined thecontribution for each component and its percentage, then what is thepercentage mean. In this technique a good classified image resultand faster time required to done the classification process.

scholarly journals Spectroscopy of H II regions in the late-type spiral galaxy NGC 6946

2013 ◽  
Vol 68 (1) ◽  
pp. 40-52 ◽  
Author(s):  
A. S. Gusev ◽  
F. H. Sakhibov ◽  
S. N. Dodonov
Keyword(s):  
Spiral Galaxy ◽  
H Ii Regions ◽  
Late Type ◽  
Ngc 6946

scholarly journals ASCA Observation of Ultra-Luminous X-Ray Sources in the Nearby Spiral Galaxy NGC 2403

2000 ◽  
Vol 52 (6) ◽  
pp. 1081-1085 ◽  
Author(s):  
Jun'ichi Kotoku ◽  
Tsunefumi Mizuno ◽  
Aya Kubota ◽  
Kazuo Makishima
Keyword(s):  
Spiral Galaxy ◽  
X Ray

Discrete Radio Sources in the Spiral Galaxy NGC 6946

2000 ◽  
Vol 119 (4) ◽  
pp. 1711-1719 ◽  
Author(s):  
Scott D. Hyman ◽  
Christina K. Lacey ◽  
Kurt W. Weiler ◽  
Schuyler D. Van Dyk
Keyword(s):  
Spiral Galaxy ◽  
Radio Sources ◽  
Ngc 6946 ◽  
Discrete Radio Sources

scholarly journals Magnetic Fields in the Spiral Galaxy NGC 6946

1993 ◽  
Vol 157 ◽  
pp. 311-312
Author(s):  
Matthias Ehle ◽  
Rainer Beck
Keyword(s):  
Magnetic Field ◽  
Spiral Galaxy ◽  
High Frequency ◽  
Uniform Magnetic Field ◽  
Large Scale ◽  
Dynamo Model ◽  
Model Parameters ◽  
Radio Waves ◽  
Spiral Pattern ◽  
Ngc 6946

High frequency polarization observations reveal the existence of a large-scale ordered magnetic field in the disk of the spiral galaxy NGC 6946. At lower frequencies the disk is no longer transparent to polarized radio waves due to Faraday depolarization. The spiral pattern of the uniform magnetic field and the distribution of polarized intensities are fairly well simulated by a dynamo model. The model parameters indicate that the dynamo does not only operate in the disk, but also in the halo.

scholarly journals ASCA Observations of Two Ultra-Luminous Compact X-Ray Sources in the Edge-On Spiral Galaxy NGC 4565

1999 ◽  
Vol 51 (5) ◽  
pp. 663-671 ◽  
Author(s):  
Tsunefumi Mizuno ◽  
Tomohisa Ohnishi ◽  
Aya Kubota ◽  
Kazuo Makishima ◽  
Makoto Tashiro
Keyword(s):  
Spiral Galaxy ◽  
X Ray
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