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Simple Target
List Of Targets
Fast Xmatch with large catalogs or Simbad
Target
Name (resolved by
Sesame
) or
Position
:
J2000
B1975
B1950
B1900
B1875
B1855
Galactic
Supergal.
Ecl.J2000
Target dimension:
deg
arcmin
arcsec
NB: The epoch used for the query is the original epoch of the table(s)
Radius
Box size
J/ApJ/905/52
-1
Extreme variability QSOs from SDSS DR16 (Guo+, 2020)
ReadMe+ftp
2020ApJ...905...52G
Similar Catalogs
spectrum
Post annotation
1.
J/ApJ/905/52/table3
Catalog
[spectrum]
(696 rows)
meta
J/ApJ/905/52/table3
Simple Constraint
List Of Constraints
Query by
Constraints
applied on Columns
(
Output Order:
+
-
)
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Column
Constraint
Explain
(
UCD
)
recno
Record number assigned by the VizieR team. Should Not be used for identification.
(
meta.record
)
(
RECORD
)
GroupID
[10859/292717] SDSS DR16 repeat catalog object identifier
(
meta.id
)
(
ID_IDENTIFIER
)
m_GroupID
(n)
Number of SDSS spectra in this table for this quasar
(
meta.number
)
(
NUMBER
)
Plate
[309/11703] SDSS spectroscopic plate number
(
meta.id;instr.plate
)
(
ID_PLATE
)
MJD
d
[51792/58543] Modified Julian Date of spectroscopic observation
(
time.epoch
)
(
TIME_DATE
)
Fiber
[2/1000] SDSS spectroscopic fiber number
(
meta.number;pos.parallax.spect
)
(
ID_FIBER
)
RAJ2000
deg
(i)
Right Ascension (J2000)
(
pos.eq.ra;meta.main
)
(
POS_EQ_RA_MAIN
)
DEJ2000
deg
(i)
[-8.5/65.6] Declination (J2000)
(
pos.eq.dec;meta.main
)
(
POS_EQ_DEC_MAIN
)
z
[1.5/4] Spectroscopic redshift
(
src.redshift
)
(
REDSHIFT_HC
)
Nep
[2/23] Number of spectroscopic observations
(
meta.number
)
(
NUMBER
)
FIRST
[-1/1] FIRST detection code (1=detected; -1=out of FIRST footprint)
(
meta.code
)
(
CODE_MISC
)
ALL
cols
(n)
indicates a possible blank or NULL column
(i)
indexed column
F1.4GHz
mJy
(n)
[0.7/160] Observed FIRST 20cm flux density
(
phot.flux.density;em.radio.750-1500MHz
)
(
PHOT_FLUX_RADIO_1.4G
)
Flag
[-1/1] Brightest/faintest epoch flag (1=brightest or -1=faintest epoch)
(
meta.code.error
)
(
CODE_MISC
)
1450avg
[1/2.1] Rest frame 1450Å continuum variability
(Note 1)
(
src.var;spect.continuum
)
(
VAR_AMPLITUDE_VALUE
)
F1450
cW/m2/nm
[-0.007/122] Rest frame 1450Å flux density; erg/s/cm
2
/Å
(
phot.flux
)
(
SPECT_FLUX_VALUE
)
SN1450
[-0.012/26] Signal-to-Noise at 1450Å
(
stat.snr
)
(
INST_S/N
)
SNCIV
[0.1/57.2] Signal-to-Noise of CIV line
(
stat.snr
)
(
SPECT_S/N
)
L1350
[10-7W]
[-1/47.2] Log monochromatic 1350Å luminosity; erg/s
(
phys.luminosity
)
(
SPECT_LUMINOSITY
)
e_L1350
[10-7W]
(n)
[0/0.3] Uncertainty in L1350
(
stat.error
)
(
ERROR
)
FWHM-civ
km/s
[1199/13274] Whole CIV line Full-Width at Half-Maximum
(
spect.line.width
)
(
SPECT_LINE_FWHM
)
e_FWHM-civ
km/s
(n)
[0.2/7636] Uncertainty in FWHM-civ
(
stat.error
)
(
ERROR
)
EW-civ
0.1nm
[13.6/283.8] Rest frame broad CIV equivalent width; in Angstroms
(
spect.line.eqWidth
)
(
SPECT_EQ-WIDTH
)
e_EW-civ
0.1nm
(n)
[0/89.6] Uncertainty in EW-civ
(
stat.error;spect.line.eqWidth
)
(
ERROR
)
BH-civ
[Msun]
(n)
[7.2/9.8] Log virial BH mass from CIV
(Note 2)
(
phys.mass
)
(
PHYS_MASS_MISC
)
e_BH-civ
[Msun]
(n)
[0.001/1.2] Uncertainty in BH-civ
(
stat.error
)
(
ERROR
)
BH-mean
[Msun]
(n)
[7.4/10] Log adopted fiducial virial BH mass
(Note 3)
(
phys.mass
)
(
PHYS_MASS_MISC
)
e_BH-mean
[Msun]
(n)
[0.002/1.2] Uncertainty in BH-mean
(
stat.error
)
(
ERROR
)
LogEdd
[-]
(n)
[-2.1/0.3] Log Eddington ratio based on logMBHa
(
phys.mass;arith.ratio
)
(
PHYS_MASS_RATIO
)
chi2
[1.4/33] Reduced χ
2
for CIV line fitting
(
stat.fit.chi2
)
(
FIT_CHI2
)
Type
[0/1] Type (0=changing-look quasar (CLQ); 1=extreme variability quasar (EVQ), 650 occurrences)
(
meta.code
)
(
CODE_MISC
)
DR16
Display data from the SDSS DR16 (
V/154
) and DR16Q (
VII/289
) catalogs
(
meta.ref.url
)
(
DATA_LINK
)
Sp
Interactive spectrum from SDSS-DR16
(
meta.ref.url
)
(
DATA_LINK
)
spectrum
SimbadName
(char)
(n)
Designation understandable by the
Simbad
data-base
(
meta.id
)
(
ID_ALTERNATIVE
)
NED
ask the
NED
data-base about this object
(
meta.ref.url
)
(
DATA_LINK
)
ALL
cols
(n)
indicates a possible blank or NULL column
(i)
indexed column
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https://cdsannotations.u-strasbg.fr/annotations/vizierTable//
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