2005A&A...440..171C


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.19CET07:48:12

2005A&A...440..171C - Astronomy and Astrophysics, volume 440, 171-177 (2005/9-2)

A multi-frequency study of the spectral index distribution in the SNR CTB 80.

CASTELLETTI G. and DUBNER G.

Abstract (from CDS):

We have conducted a study at radio wavelengths of the spectral behaviour of the supernova remnant (SNR) CTB 80. Based on an homogenised data set of integrated flux densities, we calculated for the whole SNR a radio index α=-0.36±0.02. The shape of the global spectrum suggests absorption by ionized gas in the interstellar medium (ISM) along the line of sight. Spatial spectral variations across the SNR are investigated based on high-angular resolution data at 240, 324, 610, and 1380MHz using different techniques. The three extended arms associated with this SNR show a clear indication of spectral steepening when moving outwards from the central nebula, with variations of up to Δα~-0.9. However, while the spectral steepening is smooth along the eastern arm, the northern and soutwestern arms include locally flatter structures, which in all cases coincide with radio, IR and optical emission enhancements. We interpret this spectral property as the result of the combination of two different particle populations: aging relativistic electrons injected by PSR B1951+32 and particles accelerated at the sites where the SNR shock front encounters interstellar gas inhomogeneities. Concerning the central nebula, the angular resolution of the available database does not permit a detailed spectral study of the core region, i.e. the 45'' region around PSR B1951+32, where we can only confirm an average spectral index α=0.0. The surrounding 8' plateau nebula has an <α≳-0.25, with a peak of α~-0.29 coincident with a secondary maximun located at the termination of a twisted filament that trails to the east, behind the pulsar.

Abstract Copyright:

Journal keyword(s): ISM: individual objects: CTB 80 - pulsar: individual: PSR B1951+32 - ISM: supernova remnants - continuum: ISM radio

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 W 49b SNR 19 11 09.000 +09 06 24.00           ~ 384 1
2 SNR G068.8+02.6 SNR 19 52 55 +32 54.2           ~ 327 1
3 PSR B1951+32 Psr 19 52 58.181 +32 52 40.98           ~ 548 2
4 NAME Cyg A Sy2 19 59 28.35645829 +40 44 02.0966496   16.22 15.10     ~ 2058 2
5 NAME Cyg Loop SNR 20 51.0 +30 40           ~ 808 0

    Equat.    Gal    SGal    Ecl

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2019.11.19-07:48:12

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