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Table 3

Format of the binary FITS file that contains “trough-by-trough” information for BAL quasars.

Column Name Format Description

1 SDSS_NAME STRING SDSS-DR12 designation hhmmss.ss+ddmmss.s (J2000)
2 RA DOUBLE Right Ascension in decimal degrees (J2000)
3 Dec DOUBLE Declination in decimal degrees (J2000)
4 THING_ID INT32 Thing_ID (unique SDSS source identifier)
5 PLATE INT32 Spectroscopic Plate number
6 MJD INT32 Spectroscopic MJD
7 FIBERID INT32 Spectroscopic Fiber number

8 Z_VI DOUBLE Redshift from visual inspection
9 Z_PIPE DOUBLE Redshift from BOSS pipeline
10 ERR_ZPIPE DOUBLE Error on BOSS pipeline redshift
11 ZWARNING INT32 ZWARNING flag
12 Z_PCA DOUBLE PCA redshift
13 ERR_ZPCA DOUBLE Error on PCA redshift

14 SDSS_MORPHO INT32 SDSS morphology flag 0 = point source 1 = extended
15 BOSS_TARGET1 INT64 BOSS target flag for main survey
16 ANCILLARY_TARGET1 INT64 BOSS target flag for ancillary programs
17 ANCILLARY_TARGET2 INT64 BOSS target flag for ancillary programs
18 EBOSS_TARGET0 INT64 Target selection flag for eBOSS pilot survey

19 PSFFLUX FLOAT[5] flux in the u, g, r, i and z-bands (not corrected for Galactic extinction)
20 IVAR_PSFLUX FLOAT[5] inverse variance of u, g, r, i and z fluxes
21 PSFMAG FLOAT[5] PSF magnitudes in u, g, r, i and z-bands (not corrected for Galactic
extinction)
22 ERR_PSFMAG FLOAT[5] error in u, g, r, i and z PSF magnitudes
23 GAL_EXT FLOAT[5] Galactic extinction in the 5 SDSS bands (from Schlegel et al. 1998)

24 SNR_SPEC FLOAT Median signal-to-noise ratio per pixel over the whole spectrum
25 SNR_1700 FLOAT Median signal-to-noise ratio per pixel in the window 1650–1750 Å
(rest frame)
26 SNR_3000 FLOAT Median signal-to-noise ratio per pixel in the window 2950–3050 Å
(rest frame)

27 BI_CIV DOUBLE Balnicity Index (BI)
28 ERR_BI_CIV DOUBLE Error on Balnicity index
29 NCIV_2000 INT32 Number of troughs wider than 2000 km s-1
30 VMIN_CIV_2000 DOUBLE[5] Minimum velocity of each detected absorption trough (Col. #29)
31 VMAX_CIV_2000 DOUBLE[5] Maximum velocity of each detected absorption trough (Col. #29)
32 POSMIN_CIV_2000 DOUBLE[5] Position of the minimum of each absorption trough
33 FMIN_CIV_2000 DOUBLE[5] Normalized flux density at the minimum of each absorption trough
34 AI_CIV DOUBLE Absorption index (AI)
35 ERR_AI_CIV DOUBLE Error on absorption index
36 NCIV_450 INT32 Number of absorption trough wider than 450 km s-1
37 VMIN_CIV_450 DOUBLE[17] Minimum velocity of each detected absorption trough (Col. #36)
38 VMAX_CIV_450 DOUBLE[17] Maximum velocity of each detected absorption trough (Col. #36)
39 POSMIN_CIV_450 DOUBLE[17] Position of the minimum of each absorption trough
40 FMIN_CIV_450 DOUBLE[17] Normalized flux density at the minimum of each absorption trough

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