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J/AJ/139/390/Rloud Optically selected BL Lac objects from SDSS-DR7 (Plotkin+, 2010)
Observed and derived parameters of radio-loud BL Lac candidates (tables 5 and 7 of paper) (637 rows)
  recno=537
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ColumnValue  Explain   (UCD)
_RAJ200015 34 47.2104 "h:m:s" Right ascension (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra)
_DEJ2000+37 15 54.540 "d:m:s" Declination (FK5, Equinox=J2000.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec)
_RAB195015 32 54.3830 "h:m:s" Right ascension (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.ra)
_DEB1950+37 25 50.938 "d:m:s" Declination (FK4, Equinox=B1950.0) (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.eq.dec)
_Glon059.8599011 deg Galactic longitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lon)
_Glat+54.2889800 deg Galactic latitude (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services) (pos.galactic.lat)
537recno 537  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)

SDSS153447.21+371554.5  SDSS source name (HHMMSS.ss+DDMMSS.s) (Note 1)   (meta.id;meta.main)
RAJ2000233.69671 deg (i) Right ascension (J2000) (pos.eq.ra;meta.main)
DEJ2000+37.26515 deg (i) Declination (J2000) (pos.eq.dec;meta.main)
ClH   [HL] High or Low-confidence Classification (Note 2)   (meta.code.qual)
NBY   [NY] Object appears as NED BL Lac object? (Note 3)   (meta.code)
umag18.38 mag SDSS u-band apparent magnitude (phot.mag;em.opt.U)
gmag17.84 mag SDSS g-band apparent magnitude (phot.mag;em.opt.B)
rmag17.34 mag SDSS r-band apparent magnitude (phot.mag;em.opt.R)
imag17.04 mag SDSS i-band apparent magnitude (phot.mag;em.opt.I)
zmag16.82 mag SDSS z-band apparent magnitude (phot.mag;em.opt.I)
zsp 0.143   Spectroscopic redshift (src.redshift)
q_zspR   [LRTU] Redshift reliability (Note 4)   (meta.code.qual)
C 0.176   CaII H/K break strength (spect.line.intensity)
alpha 1.24  Optical spectral index referenced at 616.5nm αν (spect.index)
CommentsA07,P08   Additional comments (Note 5)   (meta.note)

SloanSloan  Display the SDSS data for this BL Lac object (meta.ref.url)

zgal    Host galaxy redshift limit (Note 6)   (src.redshift)
FAGN17.00 mag AGN component apparent magnitude (Note 7)   (phot.mag)
logLo29.286 [10-7W/Hz] Log AGN component optical specific luminosity (Note 8)   (phys.luminosity;em.opt)
f_F1.4F   [FNUX] Radio flag, U=upper limit (Note 9)   (meta.code)
F1.4 22.140 mJy Radio flux density at observed-frame 1.4GHz (Note 10)   (phot.flux.density;em.radio.750-1500MHz)
logLr31.150 [10-7W/Hz] Log radio specific luminosity (Note 11)   (phys.luminosity;em.radio)
f_FXR   [RU] X-ray flag, U=upper limit (Note 12)   (meta.code)
FX 3.885 10-16W/m2 Unabsorbed X-ray flux in 10–13erg/scm2 (Note 13)   (phot.flux;em.X-ray)
logLX25.360 [10-7W/Hz] Log X-ray specific luminosity (Note 14)   (phys.luminosity;em.X-ray)
a(ro) 0.367   Radio-optical spectral index αro (Note 15)   (spect.index)
a(oX) 1.508  Optical-X-ray spectral index αoX (Note 16)   (spect.index)

NEDNED  ask the NED data-base about this object (meta.ref)
  
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