DR10

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) (new window)

Targeting criteriaSEGUE flagsHAMMER spectral typeSpectral subclass
GALEnnnXNASBT
Radial velocity (km/s)RV errorEffective temp (K)Teff error
-9999.0-9999.00 -9999 -9999
[Fe/H] (dex)[Fe/H] errorlog10(g) (dex)log10(g) error
-9999.0-9999.00-9999.0-9999.00

APOGEE Stellar Parameters and Chemical Abundances Pipeline (ASPCAP) (new window)

 

Galaxy Property Estimates (new window)

Model Fitting: Portsmouth group (Spectro-photometric matching) (new window)

Star Forming Model

Best-fit log10(stellar mass)1-σ min1-σ max
8.458.458.58
Best-fit age (Gyr)1-σ min1-σ max
0.3210.3210.3602
Best-fit SFR (M☉ / yr)1-σ min1-σ max
0.200.2

Passive Model

Best-fit log10(stellar mass)1-σ min1-σ max
9.429.429.42
Best-fit age (Gyr)1-σ min1-σ max
333
Best-fit SFR (M☉ / yr)1-σ min1-σ max
000

Stellar Kinematics: Portsmouth group (Emission Line Fluxes) (new window)

Stellar velocity (km/s)Stellar velocity disperson (km/s)Velocity dispersion error
9039.13920.230641487.788
Chi-squared fit of template0.9348503
BPT classificationStar Forming

Wisconsin group (Principal Component Analysis) (new window)

Assuming model spectra from Bruzal & Charlot (2003)

Best-fit log10(stellar mass)ErrorMedian veldisp (km/s)Error
9.09 0.155 109.88 45.781

Assuming model spectra from Maraston & Strömback (2011)

Best-fit log10(stellar mass)ErrorMedian veldisp (km/s)Error
9.03 0.089 134.76 87.078

Granada group (Flexible Stellar Population Synthesis) (new window)

Early Galaxy Formation, Dust Attenuation

Best-fit log10(stellar mass)ErrorAge (Gyr)SSFRmetallicity
9.43 0.014 6.58 -1.10 0.01

Early Galaxy Formation, No Dust Attenuation

Best-fit log10(stellar mass)ErrorAge (Gyr)SSFRmetallicity
9.43 0.014 6.58 -1.10 0.01

Wide Range of Formation Times, Dust Attenuation

Best-fit log10(stellar mass)ErrorAge (Gyr)SSFRmetallicity
8.99 0.023 1.30 -0.28 0.01

Wide Range of Formation Times, Dust Attenuation

Best-fit log10(stellar mass)ErrorAge (Gyr)SSFRmetallicity
8.99 0.027 1.42 -0.41 0.01