Table 4.
Used spectral indices.
| Spectral | Band | λ range | Used by, for example |
|---|---|---|---|
| indices | range | (μm) | |
| αKM | Ks to M1 | 2–24 | Dunham et al. (2015) |
| Heiderman & Evans (2015) | |||
| Kim et al. (2016) | |||
| αIM | I1 to M1 | 3–24 | – |
| αIRAC | I1 to I4 | 3–8 | Lada et al. (2006) |
| αI2M | I2 to M1 | 4–24 | FFA16 |
| αI3M | I3 to M1 | 5–24 | Muench et al. (2007) |
| αKI3 | Ks to I3 | 2–5 | – |
| αKW3 | Ks to W3 | 2–12 | – |
| αKW | Ks to W4 | 2–22 | – |
| αW13 | W1 to W3 | 3–12 | – |
| αWISE | W1 to W4 | 3–22 | – |
| αKW12M | Ks to M1 | 2–24 | – |
Notes. The top six rows list spectral indices which are composed of VISTA and Spitzer bands, and the following four rows are composed of VISTA and WISE bands. All available bands are used between the individually given ranges, however, Spitzer and WISE are not mixed, except for the last spectral index, where we combine Ks with W12 and M1, used for sources beyond the IRAC coverage but still inside the MIPS coverage.
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