Diffraction Limited Imaging Spectroscopy of the SgrA* Region using OSIRIS, a new Keck Instrument
| Autor: | Alfred Krabbe, A. Quirrenbach, C. Iserlohe, Michael W. McElwain, James E. Larkin, J. Weiss, Matthew Barczys, Shelley A. Wright |
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| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
Diffraction
Physics Spectral index Infrared Astrophysics::High Energy Astrophysical Phenomena Astrophysics (astro-ph) FOS: Physical sciences Astronomy and Astrophysics Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics law.invention Imaging spectroscopy Laser guide star Space and Planetary Science Observatory law Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Spectrograph Astrophysics::Galaxy Astrophysics Flare |
| Popis: | We present diffraction limited spectroscopic observations of an infrared flare associated with the radio source SgrA*. These are the first results obtained with OSIRIS, the new facility infrared imaging spectrograph for the Keck Observatory operated with the laser guide star adaptive optics system. After subtracting the spectrum of precursor emission at the location of Sgr A*, we find the flare has a spectral index of -2.6 +- 0.9. If we do not subtract the precursor light, then our spectral index is consistent with earlier observations by Ghez et al. (2005). All observations published so far suggest that the spectral index is a function of the flare's K-band flux. paper accepted for publication in ApJ Letters |
| Databáze: | OpenAIRE |
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