Artículo
Abstract:
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 1380 MHz 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. © ESO 2005.
Registro:
| Documento: | Artículo |
| Título: | A multi-frequency study of the spectral index distribution in the SNR CTB 80 |
| Autor: | Castelletti, G.; Dubner, G. |
| Filiación: | Instituto de Astronomía y Física del Espacio (IAFE), CC 67, Suc. 28, 1428 Buenos Aires, Argentina |
| Palabras clave: | ISM: individual objects: CTB 80; ISM: supernova remnants; Pulsar: individual: PSR B1951+32; Radio continuum: ISM; Infrared radiation; Light absorption; Light emission; Optical resolving power; Radio; ISM: individual objects: CTB 80; ISM: supernova remnants; Pulsar: individual: PSR B1951+32; Radio continuum: ISM; Astrophysics |
| Año: | 2005 |
| Volumen: | 440 |
| Número: | 1 |
| Página de inicio: | 171 |
| Página de fin: | 177 |
| DOI: | http://dx.doi.org/10.1051/0004-6361:20042537 |
| Título revista: | Astronomy and Astrophysics |
| Título revista abreviado: | Astron. Astrophys. |
| ISSN: | 00046361 |
| CODEN: | AAEJA |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v440_n1_p171_Castelletti |
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Citas:
---------- APA ----------
Castelletti, G. & Dubner, G. (2005) . A multi-frequency study of the spectral index distribution in the SNR CTB 80. Astronomy and Astrophysics, 440(1), 171-177.http://dx.doi.org/10.1051/0004-6361:20042537
---------- CHICAGO ----------
Castelletti, G., Dubner, G. "A multi-frequency study of the spectral index distribution in the SNR CTB 80" . Astronomy and Astrophysics 440, no. 1 (2005) : 171-177.http://dx.doi.org/10.1051/0004-6361:20042537
---------- MLA ----------
Castelletti, G., Dubner, G. "A multi-frequency study of the spectral index distribution in the SNR CTB 80" . Astronomy and Astrophysics, vol. 440, no. 1, 2005, pp. 171-177.http://dx.doi.org/10.1051/0004-6361:20042537
---------- VANCOUVER ----------
Castelletti, G., Dubner, G. A multi-frequency study of the spectral index distribution in the SNR CTB 80. Astron. Astrophys. 2005;440(1):171-177.http://dx.doi.org/10.1051/0004-6361:20042537
