SDSS-DPOSS Sample: File Format

Field (Column) Format Units Label Explanations
1 F10.6 deg ra Right Ascension in decimal degrees (J2000)
2 F10.6 deg dec Declination in decimal degrees (J2000)
3 I3 --- plateID DPOSS Plate ID
4 F9.4 yrs EpochG Epoch of the DPOSS observation in the G band
5 F9.4 yrs EpochR Epoch of the DPOSS observation in the R band
6 F9.4 yrs EpochI Epoch of the DPOSS observation in the I band
7 F6.2 mag G_POSS DPOSS catalog G magnitude (4)
8 F6.2 mag G_ERR Error in G
9 F6.2 mag G_GOOD G-band quality flag (5)
10 F6.2 mag R_POSS DPOSS catalog R magnitude (4)
11 F6.2 mag R_ERR Error in R
12 F6.2 mag R_GOOD R-band quality flag (5)
13 F6.2 mag I_POSS DPOSS catalog I magnitude (4)
14 F6.2 mag I_ERR Error in I
15 I1 mag I_GOOD I-band quality flag (5)
16 I6 --- SDR7ID Row of DR7 Quasar Catalog V (out of 105783)
17 F7.3 mag M_i Absolute i band magnitude (8)
18 F6.4 --- redshift redshift
19 F6.3 [Msun] mbh Black hole mass ('0.000' means none could be found) (7)
20 F6.3 [ergs/s] lbol Bolometric luminosity (7)
21 F6.3 mag A_u Galactic extinction in u filter (3)
22 I1 --- nobs Number of observations
23 I1 --- s82flag Flag for Stripe 82 object (1)
24 I5 days mjd_r_SDSS Modified Julian Date for SDSS imaging observation
25 F6.3 mag g_SDSS BEST SDSS g band PSF magnitude (2)
26 F6.3 mag g_ERR Error in g
27 F6.3 mag r_SDSS BEST SDSS r band PSF magnitude (2)
28 F6.3 mag r_ERR Error in r
29 F6.3 mag i_SDSS BEST SDSS i band PSF magnitude (2)
30 F6.3 mag i_ERR Error in i

Note (1):
    0 = not in SDSS Stripe 82;
    1 = has Stripe 82 light curve.
Note (2): SDSS photometric measurements are asinh magnitudes (Lupton, Gunn,
    and Szalay 1999, AJ, 118, 1406) and are normalized (to ~3% accuracy)
    to the AB-magnitude system (Oke and Gunn 1983, ApJ, 266, 713).
    Uncorrected for Galactic extinction. A 0.000 indicates that the
    value couldn't be retrieved from the SDSS database.
Note (3): Where Ag, Ar, Ai, Az = 0.736, 0.534, 0.405, 0.287 x Au. Values come from Schlegel et al. 1998.
Note (4): Not corrected for Galactic absorption. Bad observations are printed as '-99.99'.
Note (5): Flag indicating whether the recalibrated magnitude is of good quality (a value of 1 is ``good''). See Sesar et al. 2006 for a description of these cuts.
Note (7): In log (base 10) form. Taken from the Shen et al. (2011) catalog.
Note (8): For Ho = 70.0, ΩM = 0.300, ΩL = 0.700, αQ = -0.50.

Return to Main page
Return to SDSS-POSS Sample