Skip to main content Accessibility help
×
Home

A strong radio brightening at the jet base of M87 during the elevated very-high-energy γ-ray state in 2012

  • K. Hada (a1) (a2), M. Giroletti (a1), M. Kino (a3) (a4), G. Giovannini (a1) (a5), F. D' Ammando (a1), C. C. Cheung (a6), M. Beilicke (a7), H. Nagai (a7), A. Doi (a4), K. Akiyama (a2) (a8), M. Honma (a2) (a9), K. Niinuma (a9), C. Casadio (a10), M. Orienti (a1), H. Krawczynski (a7), J. L. Gómez (a10), S. Sawada-Satoh (a2), S. Koyama (a2) (a4) (a8), A. Cesarini (a11), S. Nakahara (a12) and M. A. Gurwell (a13)...

Abstract

The nearby radio galaxy M87 offers a unique opportunity for exploring the connection between γ-ray production and jet formation at an unprecedented linear resolution. However, the origin and location of the γ-rays in this source is still elusive. Based on previous radio/TeV correlation events, the unresolved jet base (radio core) and the peculiar knot HST-1 at >120 pc from the nucleus are proposed as candidate site(s) of γ-ray production. Here we report our intensive, high-resolution radio monitoring observations of the M87 jet with the VLBI Exploration of Radio Astrometry (VERA) and the European VLBI Network (EVN) from February 2011 to October 2012. During this period, an elevated level of the M87 flux is reported at TeV with VERITAS. We detected a remarkable flux increase in the radio core with VERA at 22/43 GHz coincident with the VHE activity. Meanwhile, HST-1 remained quiescent in terms of its flux density and structure at radio. These results strongly suggest that the TeV γ-ray activity in 2012 originates in the jet base within 0.03 pc (projected) from the central supermassive black hole.

    • 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.

      A strong radio brightening at the jet base of M87 during the elevated very-high-energy γ-ray state in 2012
      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.

      A strong radio brightening at the jet base of M87 during the elevated very-high-energy γ-ray state in 2012
      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.

      A strong radio brightening at the jet base of M87 during the elevated very-high-energy γ-ray state in 2012
      Available formats
      ×

Copyright

References

Hide All
Abdo, A. A., Ackermann, M., Ajello, M., et al. 2009, ApJ, 707, 55
Abramowski, A., Acero, F., Aharonian, F., et al. 2012, ApJ, 746, 151
Acciari, V. A., Aliu, E., Arlen, T., et al. 2009, Science, 325, 444
Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., et al. 2006, Science, 314, 1424
Asada, K. & Nakamura, M. 2012, ApJ, 745, L28
Barkov, M. V., Aharonian, F. A., & Bosch-Ramon, V. 2010, ApJ, 724, 1517
Beilicke, M., VERITAS Collaboration 2012, arXiv:1210.7830
Cheung, C. C., Harris, D. E. & Stawarz, Ł. 2007, ApJ, 663, L65
Doeleman, S. S., Fish, V. L., Schenck, D. E., et al. 2012, Science, 338, 355
Georganopoulos, M., Perlman, E. S., & Kazanas, D. 2005, ApJ, 634, L33
Giannios, D., Uzdensky, D. A., & Begelman, M. C. 2010, MNRAS, 402, 1649
Giroletti, M., Hada, K., Giovannini, G., et al. 2012, A&A, 538, L10
Hada, K., Doi, A., Kino, M., et al. 2011, Nature, 477, 185
Hada, K., Kino, M., Nagai, H., et al. 2012, ApJ, 760, 52
Hada, K., Kino, M., Doi, A., et al. 2013, ApJ, 775, 70
Hada, K., Giroletti, M., Kino, M., et al. 2014, ApJ, 788, 165
Harris, D. E., Cheung, C. C., Stawarz, Ł., et al. 2009, ApJ, 699, 305
Harris, D. E., Massaro, F., Cheung, C. C., et al. 2011, ApJ, 743, 177
Lenain, J.-P., Boisson, C., Sol, H., & Katarzyński, K. 2008, A&A, 478, 111
Neronov, A. & Aharonian, F. A. 2007, ApJ, 671, 85
Niinuma, K., Lee, S.-S., Kino, M., et al. 2014, PASJ, 66, 103
Stawarz, Ł., Aharonian, F., Kataoka, J., et al. 2006, MNRAS, 370, 981
Tavecchio, F. & Ghisellini, G. 2008, MNRAS, 385, L98
MathJax
MathJax is a JavaScript display engine for mathematics. For more information see http://www.mathjax.org.

Keywords

Metrics

Altmetric attention score

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