2011A&A...527A.108S

Query : 2011A&A...527A.108S

2011A&A...527A.108S - Astronomy and Astrophysics, volume 527A, 108-108 (2011/3-1)

Revisiting the radio interferometer measurement equation. III. Addressing direction-dependent effects in 21 cm WSRT observations of 3C 147.

SMIRNOV O.M.

Abstract (from CDS):

Papers I and II of this series have extended the radio interferometry measurement equation (RIME) formalism to the full-sky case, and provided a RIME-based description of calibration and the problem of direction-dependent effects (DDEs). This paper aims to provide a practical demonstration of a RIME-based approach to calibration, via an example of extremely high-dynamic range calibration of WSRT observations of 3C 147 at 21cm, with full treatment of DDEs. A version of the RIME incorporating differential gains has been implemented in MeqTrees, and applied to the 3C 147 data. This was used to perform regular selfcal, then solve for interferometer-based errors and for differential gains. The resulting image of the field around 3C 147 is thermal noise-limited, has a very high dynamic range (1.6 million), and none of the off-axis artefacts that plague regular selfcal. The differential gain solutions show a high signal-to-noise ratio, and may be used to extract information on DDEs and errors in the sky model. The differential gain approach can eliminate DDE-related artefacts, and provide information for iterative improvements of sky models. Perhaps most importantly, sources as faint as 2mJy have been shown to yield meaningful differential gain solutions, and thus can be used as potential calibration beacons in other DDE-related schemes.

Abstract Copyright: ∼

Journal keyword(s): methods: analytical - methods: data analysis - methods: numerical - techniques: interferometric - techniques: polarimetric

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1493 1

Query : 2011A&A...527A.108S

Basic data :
ICRF J054236.1+495107 -- Seyfert 1 Galaxy
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types: 		Sy1 (), Rad (2014ApJS,ICRF,...), QSO (2016A&A,QSO,...), smm (JCMTSE,JCMTSF), MIR (WISEA,WISE), AGN (2020MNRAS), G (LEDA), * (Gaia), X (2E), NIR (2MASS), IR (2MASSI)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) : 		05 42 36.13789710 +49 51 07.2337139 (Radio) [ 0.0463263 0.0537 0 ] A 2020A&A...644A.159C
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) : 		05 38 43.51443647 +49 49 42.8001620 [ 0.0463263 0.0537 0 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) : 		161.68637309389 +10.29833477080 [ 0.0463263 0.0537 0 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr : 		0.000 0.165 [0.108 0.077 90] A 2020yCat.1350....0G
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, ∼=unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz : 		V(km/s) 123574 [~] / z(spectroscopic) 0.55 [~] / cz 164886 [~]
   (Opt) D 2017ApJS..233....3T
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas): 		0.0594 [0.0967] A 2020yCat.1350....0G
Syntax of angular size is : "maj-axis min-axis angle (wtype) quality bibcode"
  • maj-axis : major axis size (arc minutes)
  • min-axis : minor axis size (arc minutes)
  • angle : orientation angle (in degrees)
  • (wtype) : wavelength class for the origin of the angular size (Rad, mm, IR, Opt, UV, Xray, Gam)
  • quality : flag of quality of the angular size values ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the angular size reference
Angular size (arcmin): 		0.25 0.22 66 (Opt) E 2003A&A...412...45P
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (7) :
B 18.45 [~] D 2010A&A...518A..10V
V 17.80 [~] D 2010A&A...518A..10V
R 17.210 [~] D 2010ApJ...712..303C
G 17.730537 [0.004100] C 2020yCat.1350....0G
J 15.733 [0.073] C 2003yCat.2246....0C
H 15.080 [0.098] C 2003yCat.2246....0C
K 14.555 [0.087] C 2003yCat.2246....0C
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!). sed-help-icon
Some important notes on this object about identifications and objects associations.
notes:

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (62) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

ICRF J054236.1+495107 GRA B0538+49 QSO J0542+4951 [HB93] 0538+498
BP 30 HBH 10 QSO B0538+498 [P82] 0538+498
BWE 0538+4949 IERS B0538+498 QSO B0538+49 [S77] 91
3C 147.0 JCMTSE J054236.2+495105 QSO B0538+4949 [SJS95] 0538+498
3C 147 JCMTSF J054236.2+495105 QSO J0542+498 [VV2000] J054236.3+495107
4C 49.14 1Jy 0538+49 RORF 0538+498 [VV2003] J054236.3+495107
6C 053843+494946 1Jy 0538+498 S4 0538+49 [VV2006] J054236.3+495107
6C 053843+494943 LEDA 2355407 S4 0538+498 [VV2010] J054236.3+495107
CJ1 0538+498 LHE 154 TGSSADR J054236.1+495107 [VV96] J054236.3+495107
3CR 147 2MASS J05423614+4951071 TIC 311122424 [VV98] J054236.3+495107
CTA 39 2MASSI J0542361+495107 UT 0538+498 [WTW94] 0538+498
DA 186 MY 053844.2+494952.3 VSOP J0542+4951 Gaia DR3 214160985073379840
2E 1506 MY 053844.2+495116.7 WB 0538+4949 Gaia DR1 214160985073379840
2E 0538.7+4949 NRAO 221 WISEA J054236.14+495107.1 Gaia DR2 214160985073379840
GB6 B0538+4949 NVSS J054236+495107 WISE J054236.14+495107.1
87GB 053841.9+494948 OHIO G 465 WN B0538.7+4949

References (1493 between 1850 and 2024) (Total 1493)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements


velocities : 7    PLX : 2    PM : 3   

   

Observing logs


herschel : 2   

   

External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : ICRF J054236.1+495107

Link by name to the catalogue in VizieR :

BWE 0538+4949 3C 147.0 3C 147 4C 49.14 3CR 147
2E 1506 IERS B0538+498 2MASS J05423614+4951071 2MASSI J0542361+495107 NVSS J054236+495107
VSOP J0542+4951 WISEA J054236.14+495107.1 WISE J054236.14+495107.1 WN B0538.7+4949 Gaia DR3 214160985073379840
Gaia DR1 214160985073379840 Gaia DR2 214160985073379840

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