Tag Name |
Data Type / Units
|
Description
|
| plateid |
int[1] |
Plate number |
| fiberid |
int[1] |
Fiber number (1 - 640) |
| sigma_balmer |
float[1] km/s |
Velocity dispersion (sigma not
FWHM) measured simultaneously in all of the Balmer lines |
| sigma_balmer_err |
float[1] km/s |
Error in the above |
| sigma_forbidden |
float[1] km/s |
Velocity dispersion (sigma not
FWHM) measured simultaneously in all the forbidden lines |
| sigma_forbidden_err |
float[1] km /s |
Error in the above |
| v_off_balmer |
float[1] km/s |
Velocity offset of the Balmer
lines from the measured redshift |
| v_off_balmer_err |
float[1] km/s |
Error in the above |
| v_off_forbidden |
float[1] km/s |
Velocity offset of the forbidden
lines from the measured redshift |
| v_off_forbidden_err |
float[1] km/s |
Error in the above |
| (line_name)_cont |
float[1] 1E-17 erg/s/cm^2/A |
Continuum at line center from
200 pixel median smoothing of the emission-line subtracted
continuum |
| (line_name)_cont_err |
float[1] 1E-17 erg/s/cm^2/A |
Error in the continuum computed
from the variance in the band pass (check this!!) |
| (line_name)_reqw | Angstroms |
The equivalent width of the
continuum-subtracted emission line computed from straight integration
over the bandpasses listed below (emisison is negative). In
this case the continuum comes from a running 200 pixel median and does
not properly account for stellar absorption. In general the
EQW measurements provide a better measure of the true equivalent
width. The purpose of this measurement is to help characterize
the stellar absorption effecting the line. (EW_stellar = REQW -
EQW) |
| (line_name)_reqw_err | Angstroms | Error in the equivalent width described above |
| (line_name)_eqw | Angstroms |
The equivalent width of the BC03 continuum-subtracted emission line computed from straight integration over the bandpasses listed below (emisison is negative) . This properly takes into account stellar absorption. Note that it will not be correct in the case of blended lines (ie NII & H-alpha) -- instead use FLUX/CONT. |
| (line_name)_eqw_err | Angstroms |
Error
in the equivalent width described above |
| (line_name)_flux | float[1] 1E-17 erg/s/cm^2/A |
Flux
from Gaussian fit to continuum subtracted data. (Note that the
fit is done simultaneously to all the lines so de-blending happens
automatically) |
| (line_name)_flux_err | float[1] 1E-17 erg/s/cm^2/A |
Error in the flux -- comes from
MPFIT routine -- currently it is not clear if this is correct.
There are pretty large differences in the errors depending on if
numerical or empirical derivatives are used. |
| (line_name)_inst_res | float[1] km/s |
Instrumental resolution at the
line center (measured for each spectrum from the ARC lamps) |
| (line_name)_chisq | float[1] |
Reduced chi-squared of the line
fit over the bandpass used for the EW measurement |