Free Access

Table 4

K-band spectral indices for pre-flare, dim, and bright states of SgrA*.

Author Subtraction method α Pre-flare α Dim State α Bright State
Flux  < 2 mJy 2 mJy  ≤  Flux  ≤  5.5 mJy Flux  >  5.5 mJy

off state subtr. −2.4 ± 0.8 −1.7 ± 0.8 −0.4 ± 0.4
Based on Gillessen et al. (2006) small apertures −2.8 ± 0.6 −2.7 ± 0.8 −1.1 ± 0.6
constant subtr. −4.4 ± 0.8 −3.3 ± 0.6 −1.3 ± 0.4

Based on Hornstein et al. (2007) off state subtr. −2.3 ± 4.1 −1.5 ± 1.1 −1.1 ± 0.4

Adopted in this work −1.9 to −4.3 −1.4 to −3.1 −0.6 to −1.6

Notes. Summary of spectral index derivations between NIR bands centered around 1.6 μm and 2.2 μm.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.