scholarly journals Radio observations and spectral index study of the SNR G126.2+1.6

2006 ◽  
Vol 447 (1) ◽  
pp. 205-211 ◽  
Author(s):  
W. W. Tian ◽  
D. A. Leahy
Keyword(s):  
Spectral Index ◽  
Radio Observations ◽  
Index Study

scholarly journals Non-thermal radio emission in Wolf-Rayet stars: is binarity a pre-requisite?

1999 ◽  
Vol 193 ◽  
pp. 348-349
Author(s):  
Sean M. Dougherty
Keyword(s):  
Radio Emission ◽  
Spectral Index ◽  
Thermal Emission ◽  
Radio Observations ◽  
Thermal Radio ◽  
Thermal Radio Emission ◽  
Thermal Emitters

Radio observations of Wolf-Rayet stars currently available in the literature are examined to determine whether binarity is a common feature of WR systems with non-thermal emission. Among 24 stars with observed spectral index values, seven are definite non-thermal emitters, and six others possibly have composite thermal/non-thermal spectra. Stellar companions have been identified in 71% of the non-thermal emitters, strongly supporting a link between non-thermal emission and binarity.

scholarly journals Multifrequency radio observations of a SNR in the LMC: The case of SNR J0527-6549 (DEM l204)

2010 ◽  
pp. 43-49 ◽  
Author(s):  
L.M. Bozzetto ◽  
M.D. Filipovic ◽  
E.J. Crawford ◽  
I.S. Bojicic ◽  
J.L. Payne ◽  
...  
Keyword(s):  
Spectral Index ◽  
Supernova Remnant ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
High Order ◽  
Older Age ◽  
Radio Observations ◽  
Large Size ◽  
Peak Value ◽  
Compact Array

We present a detailed study and results of new Australia Telescope Compact Array (ATCA) observations of supernova remnant SNR J0527-6549. This Large Magellanic Cloud (LMC) object follows a typical supernova remnant (SNR) horseshoe morphology with a diameter of D=(66?58)?1 pc which is among the largest SNRs in the LMC. Its relatively large size indicates older age while a steeper than expected radio spectral index of ?=-0.92?0.11 is more typical of younger and energetic SNRs. Also, we report detections of regions with a high order of polarization at a peak value of ~54%?17% at 6 cm.

scholarly journals A LOFAR-uGMRT spectral index study of distant radio halos

2021 ◽  
Author(s):  
G. Di Gennaro ◽  
R. J. van Weeren ◽  
R. Cassano ◽  
G. Brunetti ◽  
M. Brüggen ◽  
...  
Keyword(s):  
Spectral Index ◽  
Index Study ◽  
Radio Halos

scholarly journals Radio Emission from the Supernova Remnant Vela-X

1968 ◽  
Vol 21 (2) ◽  
pp. 201 ◽  
Author(s):  
DK Milne
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Radio Emission ◽  
Spectral Index ◽  
Supernova Remnants ◽  
Supernova Remnant ◽  
Magnetic Field Direction ◽  
Radio Observations ◽  
Optical Identification ◽  
Polarization Measurements

Radio observations are presented of the fairly large galactic complex Vela-X, Y, and Z. These sources are believed to be the remnant of a supernova having an optical identification with the filamentary nebula Stromlo 16. The brightness distributions, obtained at four frequencies, indicate an open annular structure reminiscent of other supernova remnants. The variation of spectral index over the region is investigated and shows that the radiation is substantially nontherm81, the integrated fluxes yielding a spectral index of -0,3. A high resolution distribution of magnetic field direction is deduced from polarization measurements made at three frequencies; a circumferential magnetic field is a possible interpretation of the field orientations.

The spectral index study for Fermi blazars

2021 ◽  
Vol 366 (1) ◽  
Author(s):  
Zhihao Ouyang ◽  
Hubing Xiao ◽  
Yini Zheng ◽  
Peishan Xu ◽  
Junhui Fan
Keyword(s):  
Spectral Index ◽  
Index Study

Radio Observations of the Marano Field: Sub-Millijansky Source Counts and Spectral Index Studies

1996 ◽  
pp. 525-526 ◽  
Author(s):  
C. Gruppioni ◽  
P. Parma ◽  
H. R. de Ruiter ◽  
G. Zamorani
Keyword(s):  
Spectral Index ◽  
Radio Observations

scholarly journals Radio Observations of the Marano Field: Sub-Millijansky Source Counts and Spectral Index Studies

1996 ◽  
Vol 175 ◽  
pp. 525-526
Author(s):  
C. Gruppioni ◽  
P. Parma ◽  
H.R. De Ruiter ◽  
G. Zamorani
Keyword(s):  
Spectral Index ◽  
Radio Observations ◽  
Flux Limit ◽  
Almost All ◽  
Compact Array

The Marano Field (centered at α(2000)=03h 15m 09s δ(2000)= −55° 13′ 57″) is a deep ROSAT field (flux limit ≃ 4 × 10–15 erg cm–2 s–1), which has been entirely covered by ESO 3.6 m plates and in the inner part by deep CCD exposures. In order to follow up these data in other wavelength regions, deep radio observations of this field have been carried out with the Australia Telescope Compact Array (ATCA) at 1.370 and 2.378 GHz. The minimum reached rms noise value is ≃42 μJy at both frequencies. 80 and 45 sources form complete samples above 5.5 σlocal level at 1.370 and 2.378 GHz respectively, in a square area of ≃0.34 sq. deg. Almost all of the sources detected at 2.378 GHz have been detected also at 1.370 GHz.

scholarly journals A spatially resolved radio spectral index study of the dwarf irregular galaxy NGC 1569

2018 ◽  
Vol 475 (4) ◽  
pp. 5116-5132
Author(s):  
Jonathan Westcott ◽  
Elias Brinks ◽  
Luke Hindson ◽  
Robert Beswick ◽  
Volker Heesen
Keyword(s):  
Spectral Index ◽  
Irregular Galaxy ◽  
Spatially Resolved ◽  
Index Study ◽  
Ngc 1569

scholarly journals Radio spectral index study of the SNRs OA184 and VRO42.05.01

2005 ◽  
Vol 440 (3) ◽  
pp. 929-936 ◽  
Author(s):  
D. Leahy ◽  
W. Tian
Keyword(s):  
Spectral Index ◽  
Index Study
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