Skip to main content Accessibility help
×
Home

The reflection of two past outbursts of Sagittarius A* observed by Chandra during the last decade

  • M. Clavel (a1) (a2), R. Terrier (a1), A. Goldwurm (a1) (a2), M. R. Morris (a3), G. Ponti (a4), S. Soldi (a1) and G. Trap (a1) (a2) (a5)...

Abstract

The supermassive black hole at the Galactic center, Sagittarius A* has experienced periods of higher activity in the past. The reflection of these past outbursts is observed in the molecular material surrounding the black hole but reconstructing its precise lightcurve is difficult since the distribution of the clouds along the line of sight is poorly constrained.

Using Chandra high-resolution data collected from 1999 to 2011 we studied both the 6.4 keV and the 4–8 keV emission of the region located between Sgr A* and the Radio arc, characterizing its variations down to 15″ angular scale and 1-year time scale. The emission from the molecular clouds in the region varies significantly, showing either a 2-year peaked emission or 10-year linear variations. This is the first time that such fast variations are measured. Based on the cloud parameters, we conclude that these two behaviors are likely due to two distinct past outbursts of Sgr A* during which its luminosity rose to at least 1039 erg s−1.

    • 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.

      The reflection of two past outbursts of Sagittarius A* observed by Chandra during the last decade
      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.

      The reflection of two past outbursts of Sagittarius A* observed by Chandra during the last decade
      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.

      The reflection of two past outbursts of Sagittarius A* observed by Chandra during the last decade
      Available formats
      ×

Copyright

References

Hide All
Baganoff, F. K., Maeda, Y., Morris, M., et al. 2003, ApJ 591, 891
Capelli, R., Warwick, R. S., Porquet, D., et al. 2012, A&A 545, A35
Clavel, M., Terrier, R., Goldwurm, A., et al. 2013, A&A 558, A32
Greene, J. E. & Ho, L. C. 2007, ApJ 667, 131
Inui, T., Koyama, K., Matsumoto, H., et al. 2009, PASJ 61, 241
Jones, P. A., Burton, M. G., Cunningham, M. R., et al. 2012, MNRAS 419, 2961
Koyama, K., Maeda, Y., Sonobe, T., et al. 1996, PASJ 48, 249
Muno, M. P., Baganoff, F. K., Brandt, W. N., et al. 2007, ApJL 656, L69
Neilsen, J., Nowak, M. A., Gammie, C., et al. 2013, ApJ 774, 42
Nobukawa, M., Ryu, S. G., Tsuru, T. G., et al. 2011, ApJL 739, L52
Ponti, G., Terrier, R., Goldwurm, A., et al. 2010, ApJ 714, 732
Ponti, G., Morris, M. R., Terrier, R., et al. 2013, in Advances in Solid State Physics, Vol. 34, Cosmic Rays in Star-Forming Environments, ed. Torres, D. F. & Reimer, O., 331
Sunyaev, R. A., Markevitch, M. & Pavlinsky, M. 1993, ApJ 407, 606
Sunyaev, R. A. & Churazov, E. 1998, MNRAS 420, 388
Terrier, R., Ponti, G., Bélanger, G., et al. 2010, ApJ 719, 143
MathJax
MathJax is a JavaScript display engine for mathematics. For more information see http://www.mathjax.org.

Keywords

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