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Simple TargetList Of TargetsFast Xmatch with large catalogs or Simbad
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NB: The epoch used for the query is the original epoch of the table(s)Radius Box size

  
J/A+A/711/A285
  Euclid spectroscopy of quasars. 1. (Euclid Coll.+, 2026)
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2026A&A...711A.285E
Similar Catalogs
Post annotation 		img(gal)
1.J/A+A/711/A285/table2Mean, geometric mean, and median Euclid Q1 quasar composite spectra, along with RMS, S/N and the number of spectra in each wavelength bin (3651 rows)
2.J/A+A/711/A285/tableb1(c)Catalogue of spectroscopically identified bright quasars from Euclid Q1 (3468 rows)

Simple ConstraintList Of Constraints
 
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Column  Constraint Explain   (UCD)
  (ALL)recno  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)
  (1)lambda nm [240.0/1700.0] Wavelength bin center (nm) (em.wl)
  (1)FluxMean   [0.77/16.58] Arithmetic-mean flux density (arbitrary units) (phot.flux)
  (1)e_FluxMean   [0.0/1.23] Uncertainty on arithmetic-mean flux density (stat.error)
  (1)FluxGeo   [0.72/15.98] Geometric-mean flux density (arbitrary units) (phot.flux)
  (1)e_FluxGeo   [0.0/12.31] Uncertainty on geometric-mean flux density (stat.error)
  (1)FluxMed   [0.79/17.12] Median flux density (arbitrary units) (phot.flux)
  (1)FluxRMS   [0.04/5.09] RMS flux density in bin (arbitrary units) (stat.error)
  (1)snr   [9.68/616.47] Signal-to-noise ratio in bin (stat.snr)
  (1)nSpectra   [5/1761] Number of spectra contributing to the bin (meta.number)
  (2)ObjectId  Euclid Q1 unique source identifier (object_id) (meta.id)

ALL cols		    
 (i)indexed column
  (2)Name (char) IAU-formatted source name (EUCL JHHMMSS.ss+DDMMSS.s) (name) (meta.id;meta.main)
  (2)RAJ2000 deg (i) Source barycenter right ascension (J2000) (ra) (pos.eq.ra;meta.main)
  (2)DEJ2000 deg (i) Source barycenter declination (J2000) (dec) (pos.eq.dec;meta.main)
  (2)Classvi (char) Visual classification of the source (class_vi) (meta.code.class)
  (2)zvi  Visual redshift of the source (z_vi) (src.redshift.phot)
  (2)sumMask  Sum of the mask values of the spectrum within [12047, 18734]Å (sum_mask) (meta.number)
  (2)Ninvalid  Number of invalid pixels in the spectrum within [12047, 18734]Å (n_invalid) (meta.number)
  (2)medSNR  Median signal-to-noise ratio of the spectrum within [12047, 18734]Å (med_snr) (stat.snr)
  (2)mumax-mag mag/arcsec2The difference between mu_max and magstargalsep, valid even for NIR-only sources (sec-2 mumaxminus) (stat.fit.param)
  (2)KronRadius pix Major semi-axis (in pixels) of the elliptical aperture used for total (Kron) aperture photometry on the detection image (kron_radius) (phys.angSize;src)
  (2)GaiaDR3  (n) Associated Gaia source id (gaia_id) (meta.id)
  (2)fpsf  (n) PSF fraction of the source from VIS image (f_psf) (Note 1)   (stat.fit.param)
  (2)VISmagpsf mag (n) VIS IE band PSF-fitting AB magnitude (from fluxvispsf) (magvispsf) (phot.mag;em.opt)
  (2)e_VISmagpsf mag (n) Error on VIS IE band PSF- fitting AB magnitude (magerrvispsf) (stat.error)
  (2)YEmag mag (n) YE band template-fit AB magnitude (from fluxytemplfit) (magytemplfit) (phot.mag;em.IR.J)
  (2)e_YEmag mag (n) Error on YE band template- fit AB magnitude (magerrytemplfit) (stat.error;phot.mag)
  (2)JEmag mag (n) JE band template-fit AB magnitude (from fluxjtemplfit) (magjtemplfit) (phot.mag;em.IR.J)
  (2)e_JEmag mag (n) Error on JE band template- fit AB magnitude (magerrjtemplfit) (stat.error;phot.mag)
  (2)HEmag mag (n) HE band template-fit AB magnitude (from fluxhtemplfit) (maghtemplfit) (phot.mag;em.IR.H)
  (2)e_HEmag mag (n) Error on HE band template- fit AB magnitude (magerrhtemplfit) (stat.error;phot.mag)

ALL cols		    
(n) indicates a possible blank or NULL column(i)indexed column
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