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 Emission-line objects from ALFALFA Hα survey (Kellar+, 2012)
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1.J/AJ/143/145/Ha_dotHα dot candidates-observed properties, spectroscopic results and derived quantities {em(tables 2, 3 and 4)} (61 rows)

Query by Constraints constraints help applied on Columns (Output Order: + - )
ShowSortColumn  Constraint Explain   (UCD)
  recno  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)
  Dot   [1/61] Hα dot candidate number dicS{[KSW2012] NNN} in Simbad (Note G1)   (;meta.main)
  f_Dot (char) [s] Multiple detections (Note G2)   (meta.code)
  RAJ2000 "h:m:s" Hour of Right Ascension (J2000) (pos.eq.ra;meta.main)
  DEJ2000 "d:m:s" Degree of Declination (J2000) (pos.eq.dec;meta.main)
  Dmag mag Difference between the instrumental R and Hα magnitudes (Note 1)   (phot.mag;em.line.Halpha)
  Ratio  Ratio of the magnitude difference Dmag to the magnitude difference error (Note 2)   (
  Flux 10-17W/m2The measured emission-line flux as measured from the continuum-subtracted narrowband images (in 10–14erg/s/cm2) (phot.flux)
  e_Flux 10-17W/m2Error in Flux (in 10–14erg/s/cm2) (stat.error;phot.flux)
  Rmag mag [15.83/22.64] The measured broadband R magnitude; VEGA system (phot.mag;em.opt.R)
  e_Rmag mag Error in Rmag (stat.error;phot.mag;em.opt.R)

ALL cols
  ELG (char) Emission-line galaxy type (Note 3)   (src.class)
  z  (n) Spectroscopic redshift, derived from the average redshift all strong emission lines (typical uncertainties are 15-30km/s) (src.redshift)
  cHb  (n) Decimal reddening coefficient c, derived from the Balmer-line ratio Hα/Hβ (phot.color.excess)
  W(Ha) 0.1nm (n) Equivalent width of the Hα line (spect.line.eqWidth)
  W(O3) 0.1nm (n) Equivalent width of the [OIII] line (spect.line.eqWidth)
  log(N2/Ha) [---] (n) Key reddening-corrected emission-line ratio log([NII]λ6583/Hα) (Note 4)   (spect.line.intensity;arith.ratio)
  f_log(N2/Ha) (char) [*] Unreliable log([NII]/Ha) (Note 5)   (meta.code)
  log(O3/Hb) [---] (n) Key reddening-corrected emission-line ratio log([OIII]λ5007/Hβ) (Note 4)   (spect.line.intensity;arith.ratio)
  f_log(O3/Hb) (char) [*] Unreliable log([OIII]/Hb) (Note 5)   (meta.code)
  log(O2/Hb) [---] (n) Key reddening-corrected emission-line ratio log([OII]λ3727/Hβ) (Note 4)   (spect.line.intensity;arith.ratio)
  f_log(O2/Hb) (char) [*] Unreliable log([OII]/Hb) (Note 5)   (meta.code)
  log(S2/Ha) [---] (n) Key reddening-corrected emission-line ratio log([SII]λλ6717, 6731/Hα) (Note 4)   (spect.line.intensity;arith.ratio)
  f_log(S2/Ha) (char) [*] Unreliable log([SII]/Ha) (Note 5)   (meta.code)
  [O/H] [Sun] (n) Metallicity (log(O/H)+12) (see Section 6.2) (phys.abund)
  Dist Mpc (n)Distance (pos.distance;pos.heliocentric)
  RMag mag (n) Absolute R magnitude (phot.mag;em.opt.R)
  log(LHa) [10-7W] (n) The Hα luminosity log(L) (in erg/s) (Note 6)   (phys.luminosity;em.line.Halpha)
  SFR Msun/yr (n) Star-formation rate (Note 7)   (phys.SFR)
  DV km/s (n) Velocity difference (Note 8)   (phys.veloc;arith.diff)
  DR Mpc (n) Physical separation distance (Note 8)   (pos.distance)
  Simbad  ask the {f g{FireBrick}Simbad} data-base about this object (meta.ref.url)

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