DR15
Explore Home

Search

Imaging Summary
FITS
Finding chart (new window)
Other Observations
Neighbors
Galaxy Zoo
 
PhotoTag
Field
Frame
PhotoObj
PhotoZ

Cross-ID

Spec Summary
All Spectra
FITS
Plate
SpecObj
sppLines
galSpecLine
galSpecIndx
galSpecInfo

Fit Parameters
sppParams
StarformingPort
PassivePort
emissionLinesPort
PCAWiscBC03
PCAWiscM11
FSPSGranEarlyDust
FSPSGranEarlyNoDust
FSPSGranWideDust
FSPSGranWideNoDust

NED search
SIMBAD search
ADS search

Notes
Save in Notes
Show Notes

Print

Powered by
SciServer

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 typeF5
Spectral subclass00
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 min9.35
1-σ max9.93
Best-fit age (Gyr)2.4
1-σ min Age0.7187
1-σ max Age4.5
Best-fit SFR (M / yr)0
1-σ min SFR0
1-σ max SFR0

Passive Model

Best-fit log10(stellar mass)9.95
1-σ min9.95
1-σ max9.95
Best-fit age (Gyr)3
1-σ min Age3
1-σ max Age3
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
6147.62954.743272.9510030.6670566LINER

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
9.91 0.187 92.02 13.307

Assuming model spectra from Maraston & Strömback (2011)

Best-fit log10(stellar mass)ErrorMedian veldisp (km/s)Error VelDisp
9.88 0.136 69.35 14.559

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

Early Galaxy Formation,Dust Attenuation

Best-fit log10(stellar mass)ErrorAge (Gyr)SSFRmetallicity
10.09 0.003 7.06 -1.24 0.01

Early Galaxy Formation,No Dust Attenuation

Best-fit log10(stellar mass)ErrorAge (Gyr)SSFRmetallicity
10.09 0.003 7.69 -1.48 0.01

Wide Range of Formation Times, Dust Attenuation

Best-fit log10(stellar mass)ErrorAge (Gyr)SSFRmetallicity
9.78 0.003 2.00 -1.58 0.01

Wide Range of Formation Times,No Dust Attenuation

Best-fit log10(stellar mass)ErrorAge (Gyr)SSFRmetallicity
9.77 0.003 2.09 -1.98 0.01