Skip to main content Accessibility help
×
Home

The infrared K-band identification of the DSO/G2 source from VLT and Keck data

  • A. Eckart (a1) (a2), M. Horrobin (a1), S. Britzen (a2), M. Zamaninasab (a2), K. Mužić (a3), N. Sabha (a1) (a2), B. Shahzamanian (a1) (a2), S. Yazici (a1), L. Moser (a1), M. García-Marin (a1), M. Valencia-S. (a1), A. Borkar (a1) (a2), M. Bursa (a4), G. Karssen (a1), V. Karas (a4), M. Zajaček (a4) (a5), L. Bronfman (a6), R. Finger (a6), B. Jalali (a1), M. Vitale (a1) (a2), C. Rauch (a2), D. Kunneriath (a4), J. Moultaka (a7) (a8), C. Straubmeier (a1), Y. E. Rashed (a1), K. Markakis (a1) (a2) and A. Zensus (a1) (a2)...

Abstract

A fast moving infrared excess source (G2) which is widely interpreted as a core-less gas and dust cloud approaches Sagittarius A* (Sgr A*) on a presumably elliptical orbit. VLT Ks-band and Keck K′-band data result in clear continuum identifications and proper motions of this ∼19m Dusty S-cluster Object (DSO). In 2002-2007 it is confused with the star S63, but free of confusion again since 2007. Its near-infrared (NIR) colors and a comparison to other sources in the field speak in favor of the DSO being an IR excess star with photospheric continuum emission at 2 microns than a core-less gas and dust cloud. We also find very compact L′-band emission (<0.1″) contrasted by the reported extended (0.03″ up to ∼0.2″ for the tail) Brγ emission. The presence of a star will change the expected accretion phenomena, since a stellar Roche lobe may retain a fraction of the material during and after the peri-bothron passage.

    • 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 infrared K-band identification of the DSO/G2 source from VLT and Keck data
      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 infrared K-band identification of the DSO/G2 source from VLT and Keck data
      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 infrared K-band identification of the DSO/G2 source from VLT and Keck data
      Available formats
      ×

Copyright

References

Hide All
Burkert, , et al. 2012, ApJ 750, 58
Cotera, A., Morris, M., Ghez, A. M., et al. 1999, ASPC 186, 240
Eckart, A., Muzic, K., Yazici, S., et al. 2013a, A&A 551, 18
Eckart, A., Horrobin, M., et al. 2013b, Proc. of a conf. on Nuclei of Seyfert galaxies and QSOs - Central engine & conditions of star formation, November 6-8, 2012 Max-Planck-Insitut fr Radioastronomie (MPIfR), Bonn, Germany
Gillessen, , et al. 2012, Nature 481, 51
Gillessen, , et al. 2013a, ApJ 763, 78
Gillessen, , et al. 2013b, ApJ 774, 44
Muzic, K., Schödel, R., Eckart, A., Meyer, L., & Zensus, A. 2008, A&A 482, 173
Muzic, K., Eckart, A., Schödel, R., Meyer, L. & Zensus, A. 2007, A&A 469, 993
Phifer, K., Do, T., & Meyer, L., et al. 2013, ApJ 773, 13
Shcherbakov, R. V. & Baganoff, F. K. 2010, ApJ 716, 504
Stolovy, S. R., Hayward, T. L., & Herter, T. 1996, ApJ 470, L45
Vollmer, B. & Duschl, W. J. 2000, NewA 4, 581
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