J2017+7440

General information

Source (J2000)IAU Source name (J2000)
J2017+7440
Source (B1950)IAU Source name (B1950)
2017+745
Common nameCommon name
4C 74.25
J2000 coordinatesRight ascension α and declination δ in J2000 epoch
α = 20 17 13.079301, δ = +74 40 47.999890
RedshiftRedshift
z = 2.187
Source typeOptical class
Quasar
Optical V magnitudeOptical V magnitude
mV = 18.3

Images and parameters

Observation epoch2010-10-01
S86 GHzTotal single dish flux density measured at 86 GHz obtained from pointing and calibration scan measurements at Pica Veleta or Plateau de Bure [Jy]
0.24
SS [Jy]Correlated flux density [Jy] measured on projected baseline length listed in the next column
0.31 ± 0.011
BS [Mλ]Projected baseline length [Mλ] for the measured flux density listed in the previous column
57
SL [Jy]Correlated flux density [Jy] measured on projected baseline length listed in the next column
0.141 ± 0.012
BS [Mλ]Projected baseline length [Mλ] for the measured flux density listed in the previous column
3138
Ba [μas]Major axis of the restoring beam [μas]
111
Bb [μas]Minor axis of the restoring beam [μas]
38
BPA [degrees]Position angle of the major axis [degrees]
-24.7
St [mJy]Total clean flux density [mJy]
116
Sp [mJy/beam]Peak flux density [mJy/beam]
105
σ [mJy/beam]Off-source r.m.s. noise in the residual image [mJy/beam]
4
ξrQuality factor of the residual
noise in the image
0.93

Component
StotTotal flux density of the component [mJy]
SpeakPeak flux density of the component [mJy/beam]
dComponent size [μas]
rComponent's offset from the core [μas]
θPosition angle of the offset [degrees]
TbBrightness temperature obtained from the model fits [1010K]
Tb,minVisibility based estimate of the minimum brightness temperature [1010K]
Tb,limVisibility based estimate of the maximum brightness temperature [1010K]
1 115 ± 29 104 ± 20 16 ± 3 0 0 23.727 ± 8.704 4.10 10.80

Downloads

Epoch Image UV plot RAD plot FITS file of Image
2010-10-01 eps, jpg eps, jpg eps, jpg fits