Near infrared variability of Sgr A* - spectral index measurements

Autor:	Leo Meyer, E. E. Becklin, Jessica R. Lu, G. Witzel, Randy D. Campbell, Mark Morris, Tuan Do, Andrea M. Ghez, Keith Matthews
Rok vydání:	2013
Předmět:	Sagittarius A Physics Methods statistical Spectral index Space and Planetary Science Near-infrared spectroscopy Astronomy Time lag Astronomy and Astrophysics Astrophysics
Zdroj:	Proceedings of the International Astronomical Union. 9:274-282
ISSN:	1743-9221 1743-9213
Popis:	We discuss observations of Sagittarius A* with NACO@VLT in K-band and recent synchronous observations with NIRC2@Keck II and OSIRIS@Keck I in L′-band and H-band, respectively. The variability of Sagittarius A* in the near infrared is a continuous one-state process that can be described by a pure red-noise process having a timescale of a few hours. We describe this process and its properties in detail. Our newest observations with the Keck telescopes represent the first truly synchronous high cadence data set to test for time variability of the spectral index within the near infrared. We discovered a time-variable spectral index that might be interpreted as a time lag of the L′-band with respect to the H-band.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::19c9fe71a2f74cff1ffc298fbd616ec7 https://doi.org/10.1017/s1743921314000738 Zobrazit plný text záznamu Plný text ve formátu PDF