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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 criteriaGAL
SEGUE flagsVnnnX
HAMMER spectral typeNA
Spectral subclassSTARFORMING
Radial velocity (km/s)-9999.0
RV error-9999.00
Effective temp (K) -9999
Teff error -9999
[Fe/H] (dex)-9999.0
[Fe/H] error-9999.00
log10(g) (dex)-9999.0
log10(g) error-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)9.72
1-σ min9.67
1-σ max9.75
Best-fit age (Gyr)2
1-σ min Age1.8
1-σ max Age2.2
Best-fit SFR (M / yr)0
1-σ min SFR0
1-σ max SFR0

Passive Model

Best-fit log10(stellar mass)10.32
1-σ min10.26
1-σ max10.35
Best-fit age (Gyr)11.5
1-σ min Age10.25
1-σ max Age12.5
Best-fit SFR (M / yr)0
1-σ min SFR0
1-σ max SFR0

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

Stellar velocity (km/s)Stellar velocity disperson (km/s)Velocity dispersion errorChi-squared fit of templateBPT classification
3780.68354.319575.7943611.071539Star 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 VelDisp
10.50 0.266 97.08 20.514

Assuming model spectra from Maraston & Strömback (2011)

Best-fit log10(stellar mass)ErrorMedian veldisp (km/s)Error VelDisp
10.41 0.156 85.95 26.312

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

Early Galaxy Formation,Dust Attenuation

Best-fit log10(stellar mass)ErrorAge (Gyr)SSFRmetallicity
10.58 0.021 9.11 -1.74 0.03

Early Galaxy Formation,No Dust Attenuation

Best-fit log10(stellar mass)ErrorAge (Gyr)SSFRmetallicity
10.44 0.019 10.65 -2.40 0.03

Wide Range of Formation Times, Dust Attenuation

Best-fit log10(stellar mass)ErrorAge (Gyr)SSFRmetallicity
10.58 0.021 9.11 -1.74 0.03

Wide Range of Formation Times,No Dust Attenuation

Best-fit log10(stellar mass)ErrorAge (Gyr)SSFRmetallicity
10.44 0.019 10.65 -2.40 0.03