Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/4292
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dc.contributor.authorKantharia, N. G-
dc.contributor.authorAnupama, G. C-
dc.contributor.authorSubramanian, P-
dc.date.accessioned2009-01-28T16:22:38Z-
dc.date.available2009-01-28T16:22:38Z-
dc.date.issued2005-
dc.identifier.citationB. Sripathi Acharya, Sunil Gupta, P. Jagadeesan, Atul Jain, S. Karthikeyan, Samuel Morris, and Suresh Tonwar., eds., Proceedings of the 29th International Cosmic Ray Conference. August 3 - 10, 2005, Pune, pp. 245 - 248en
dc.identifier.urihttp://hdl.handle.net/2248/4292-
dc.description.abstractRadio observations of the nova remnant of GK Per around 1985 (epoch 1) have shown it to have a spectral index of -0.4 (S propto nu^alpha) at frequencies <1.4 GHz and a spectral index of -0.7 at frequencies >1.4 GHz (Seaquist et al 1989, Biermann et al 1995). This spectrum is either due to secondary electrons from p-p interactions (Biermann et al 1995) or due to the presence of at least two electron populations which dominate the emission at different frequencies. Our radio observations (Anupama & Kantharia 2005) of the remnant of GK Persei using the Giant Metrewave Radio Telescope (GMRT) and archival Very Large Array (VLA) data show that the nova remnant has a low frequency (<1.3 GHz) spectral index alpha ~ -0.85 (in 2003; epoch 3) and a high frequency spectral index of alpha ~ -0.7 (1997; epoch 2). Moreover the higher frequencies show an annual secular decrease of ~ 2.1 % between epochs 1 and 2 whereas there is no change at 0.33 GHz. This suggests a significant evolution of the spectrum over 20 years. In this paper, we discuss a possible physical basis for this spectral evolution based on a comparison of the synchrotron loss and electron acceleration timescales.en
dc.language.isoenen
dc.publisherTata Institute of Fundamental Research-
dc.relation.ispartofseriesInternational Cosmic Ray Conference, Vol. 3-
dc.relation.urihttp://adsabs.harvard.edu/abs/2005ICRC....3..245Ken
dc.subjectCosmic rayen
dc.subjectElectron accelerationen
dc.subjectRemnant of novaen
dc.subjectGK Perseien
dc.titleCosmic ray electron acceleration in the remnant of nova GK Persei?en
dc.typeArticleen
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