Parameters from Spectroscopic Fitting

For most objects, SDSS processing pipelines find estimates of the physical parameters most likely to have produced the observed spectrum. Many different estimates are available - the right one to use will depend on the problem at hand.

Click on the name of each set of estimates for more information on the pipeline that produced those estimates (opens in a new window). Most objects will have either estimated stellar parameters or galaxy properties, but a few objects will have both.

Stellar Parameters

SEGUE Stellar Parameters Pipeline (SSPP)

APOGEE Stellar Parameters and Chemical Abundances Pipeline (ASPCAP)

Galaxy Property Estimates

Model Fitting: Portsmouth group (Spectro-photometric matching)

Stellar Kinematics: Portsmouth group (Emission Line Fluxes)

Wisconsin group (Principal Component Analysis)

Assuming model spectra from Bruzal & Charlot (2003)

Assuming model spectra from Maraston & Strömback (2011)

Granada group (Flexible Stellar Population Synthesis)

Early Galaxy Formation,Dust Attenuation

Early Galaxy Formation,No Dust Attenuation

Wide Range of Formation Times, Dust Attenuation

Wide Range of Formation Times,No Dust Attenuation