Common Name: 4C +31.56 MOJAVE 15 GHz [Total intensity movie]   | [Polariz. movie] VLBA 1.4 GHz: University College Cork Program
B1950 Name: 2021+317 2 cm VLBA Image map
J2000 Name: J2023+3153
R.A. and Dec. (J2000): 20h23m19.017s
+31d53'2.306"
AGN Class: LSP BL Lac
Redshift: 0.356 (V.Chavushyan2013priv.comm.)
Luminosity Distance: 1882 Mpc ; 4.96 pc/mas
Radio Spectrum: Flat
Gamma-ray Association LAT: Y, EGRET: N, TeV: N
Kpc-scale morphology: One-sided Halo
Jet Speed: Maximum: 213 13 μas/y ; 4.68 0.28 c
Median: 104 13 μas/y ; 2.28 0.28 c
based on 7 moving features
Lister et al. 2019, ApJ, 874, 43
Separation Versus Time Plot: PNG    PS
Stacked epoch 15 GHz VLBA images:
Uniform weight: [PS]   [GIF]
Natural weight: [PS]   [GIF]
Circular Beam : [PS]   [GIF]
Tapered Beam: [PS]   [GIF]
Pushkarev et al. 2017 :   FITS

Rotation Measure Map: | 2006_08_09 |

Spectral Index Map: | 2006_08_09 |


Multifrequency MOJAVE VLBA Data:

Epoch
8.1 GHz
8.4 GHz
12.1 GHz
2006-08-09
uvf  
uvf  
uvf  

VLBA 23 GHz: RRIFD Database
Kpc-scale: Kharb, Lister, and Cooper 2010, ApJ 710, 764
23 GHz Image
Kpc Image

Fermi LAT and 15 GHz VLBA Light Curves

Fermi LAT and 15 GHz VLBA Light Curves
VLBA 43 GHz: Cheng et al. 2020
Multiepoch Radio Spectrum:
43 GHz Image
Radio Spectrum
Comments: Ratan suggests GPS but spectrum is variable; low b; z=0.356 from V.Chavushyan2013 is unpublished

If you use these data in a publication, we ask that you please contact us so we can add a link to the list of external MOJAVE publications, and ask that you cite Lister et al., 2018, ApJS, 234, 12 and include the following acknowledgment: "This research has made use of data from the MOJAVE database that is maintained by the MOJAVE team (Lister et al. 2018)"

Important Note: The MOJAVE team, working with the OVRO 40m AGN monitoring group, has discovered a systematic error in the flux densities of all VLBA 15 GHz observations taking place after a date that lies between 2019 April 16 and 2019 May 16. All observations after that date have correlated flux densities that are between 10% and 20% too low. The MOJAVE team and NRAO are currently investigating the issue.

Asterisked entries below denote epochs that have not yet been corrected for the VLBA flux density scaling problem.
Epoch
(Y-M-D)
VLBA Code VLBA I
(mJy)
VLBA P
(mJy)
VLBA
P (%)
VLBA
EVPA (deg.)
I Image (Nat. Weight) Tapered I Image Tapered I Image (Widefield) Visibility
Data
Stokes I Radplot Pol.
Image
2021-09-13 * BL286AA
2013-07-30 BL178BG 1188 24 2.0 69 FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS PNG   PS
2012-09-02 BL178AO 1241 6.1 0.5 161 FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS PNG   PS
2012-01-14 BL178AF 1272 30 2.4 123 FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS PNG   PS
2011-07-15 BL149DM 1195 15 1.3 123 FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS PNG   PS
2011-02-20 BL149DB 1186 23 2.0 133 FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS PNG   PS
2010-09-17 BL149CP 1083 21 2.0 122 FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS PNG   PS
2010-01-16 BL149CG 1053 16 1.5 138 FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS PNG   PS
2009-03-25 BL149BJ 1180 36 3.1 112 FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS PNG   PS
2008-07-30 BL149AL 1108 19 1.7 119 FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS PNG   PS
2007-08-09 BL149AE 1051 24 2.3 111 FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS PNG   PS
2006-08-09 BL137H 917 31 3.4 116 FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS PNG   PS
2005-09-16 BL123M 761 12 1.5 137 FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS PNG   PS
2005-03-23 BL123D 693 8.7 1.3 101 FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS PNG   PS
2004-06-11 BL111M 665 11 1.6 85 FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS PNG   PS
2003-02-05 BL111E 604 14 2.4 37 FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS PNG   PS
2001-06-20 BZ026 614 no data FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS
2001-03-04 BK068E 634 no data FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS
1999-05-21 BK068A 1004 no data FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS
1997-08-28 BK052A 1373 no data FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS
1996-05-16 BK037B 2088 no data FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS
1995-04-07 BK016 2157 no data FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS
1995-01-20 BP14 1908 no data FITS   PNG   PS FITS   PNG   PS PNG   PS uvf   PNG   PS
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