Skip to main content Accessibility help
×
Home

Evidence for a wide electron spectra scatter among different SNR regions from high radio-frequency observations

  • A. Pellizzoni (a1), E. Egron (a1), M. N. Iacolina (a1), S. Loru (a1) (a2), M. Marongiu (a1), S. Righini (a3), M. Cardillo (a4), A. Giuliani (a5), S. Mulas (a2), G. Murtas (a2) and D. Simeone (a2)...

Abstract

In the framework of the Sardinia Radio Telescope (SRT) Early Science Program, we obtained single-dish high-resolution imaging of the Supernova Remnants IC443 and W44 at 7 GHz. By coupling them with SRT 1.5 GHz maps, we provided spatially-resolved spectral measurements that are highlighting a spread in spectral slope distribution. The observed features range from flat or slightly inverted spectra corresponding to bright radio limbs and filaments, to relatively steep spectra in fainter radio regions. Different theoretical possibilities explaining the above challenging findings are discussed. In particular, we exclude that the observed region-dependent wide spread in spectral slope distribution could be related to absorption processes. Our high-frequency results can be directly related to distinct electron populations in the SNRs including secondary hadronic electrons and resulting from different shocks conditions and/or undergoing different cooling processes. Integrated fluxes associated with the whole SNRs obtained by SRT in comparison with previous results in the literature support the evidence for a slight spectral steepening above 1 GHz for both sources, which could be related to primary electrons or more likely secondary hadronic electrons cut-offs.

    • Send article to Kindle

      To send this article to your Kindle, first ensure no-reply@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about sending to your Kindle. Find out more about sending to your Kindle.

      Note you can select to send to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be sent to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

      Find out more about the Kindle Personal Document Service.

      Evidence for a wide electron spectra scatter among different SNR regions from high radio-frequency observations
      Available formats
      ×

      Send article to Dropbox

      To send this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Dropbox.

      Evidence for a wide electron spectra scatter among different SNR regions from high radio-frequency observations
      Available formats
      ×

      Send article to Google Drive

      To send this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your <service> account. Find out more about sending content to Google Drive.

      Evidence for a wide electron spectra scatter among different SNR regions from high radio-frequency observations
      Available formats
      ×

Copyright

References

Hide All
Abdo, A. A. et al. 2010, Science, 327, 1103
Ackermann, M. et al. 2013, Science, 339, 807
Cardillo, M. et al. 2014, A&A, 565, A74
Cardillo, M., Amato, E., & Blasi, P. 2016, A&A, 595, 58
Castelletti, G., Dubner, G., Clarke, T., & Kassim, N. E. 2007, A&A, 471, 537
Castelletti, G., Dubner, G., Clarke, T., & Kassim, N. E. 2011, A&A, 534, A21
Ellison, D. C., Baring, M. G., & Jones, F. C. 1995, ApJ, 453, 873
Ellison, D. C., Baring, M. G., & Jones, F. C. 1997, ApJ, 473, 1029
Giuliani, A. et al. 2011, ApJ, 742, L30
Humensky, B., the VERITAS Collaboration 2015, ICRC, 34, 875
Lee, S-H., Patnaude, D. J., Raymond, J. C., Nagataki, S., Slane, P. O., & Ellison, D. C. 2015, ApJ, 806, 71
Sturner, S. J., Skibo, J. G., Dermer, C. D., & Mattox, J. R. 1997, ApJ, 490, 619
MathJax
MathJax is a JavaScript display engine for mathematics. For more information see http://www.mathjax.org.

Keywords

Evidence for a wide electron spectra scatter among different SNR regions from high radio-frequency observations

  • A. Pellizzoni (a1), E. Egron (a1), M. N. Iacolina (a1), S. Loru (a1) (a2), M. Marongiu (a1), S. Righini (a3), M. Cardillo (a4), A. Giuliani (a5), S. Mulas (a2), G. Murtas (a2) and D. Simeone (a2)...

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed