2001PASP..113.1247H

Query : 2001PASP..113.1247H

2001PASP..113.1247H - Publ. Astron. Soc. Pac., 113, 1247-1273 (2001/October-0)

All-Stokes parameterization of the main beam and first sidelobe for the Arecibo radio telescope.

HEILES C., PERILLAT P., NOLAN M., LORIMER D., BHAT R., GHOSH T., HOWELL E., LEWIS M., O'NEIL K., SALTER C. and STANIMIROVIC S.

Abstract (from CDS):

Radio astronomical measurements of extended emission require knowledge of the beam shape and response because the measurements need correction for quantities such as beam efficiency and beamwidth. We describe a scheme that characterizes the main beam and sidelobe in all Stokes parameters employing parameters that allow reconstruction of the complete beam patterns and, also, afford an easy way to see how the beam changes with azimuth, zenith angle, and time. For the main beam in Stokes I, the parameters include the beamwidth, ellipticity and its orientation, coma and its orientation, the point-source gain, and the integrated gain (or, equivalently, the main-beam efficiency); for the other Stokes parameters, the beam parameters include beam squint and beam squash. For the first sidelobe ring in Stokes I, the parameters include an eight-term Fourier series describing the height, radius, and radial width; for the other Stokes parameters they include only the sidelobe's fractional polarization.

We illustrate the technique by applying it to the Arecibo telescope. The main-beam width is smaller and the sidelobe levels higher than for a uniformly illuminated aperture of the same effective area. These effects are modeled modestly well by a blocked aperture, with the blocked area equal to about 10% of the effective area (this corresponds to 5% physical blockage). In polarized emission, the effects of beam squint (difference in pointing direction between orthogonal polarizations) and squash (difference in beamwidth between orthogonal polarizations) do not correspond to theoretical expectation and are higher than expected; these effects are almost certainly caused by the blockage. The first sidelobe is highly polarized because of blockage. These polarization effects lead to severe contamination of maps of polarized emission by spatial derivatives in brightness temperature.


Abstract Copyright: ∼

Journal keyword(s): Instrumentation: Polarimeters - Polarization - Techniques: Miscellaneous - 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 - 2026 		#notes
1 4C 09.57 BLL 17 51 32.81857326 +09 39 00.7284066   17.46 16.78 15.57   ~ 1007 1

Query : 2001PASP..113.1247H

Basic data :
4C 09.57 -- BL Lac
Other object types: otypes_help 		Rad (2010AJ,4C,...), QSO (2008ApJS,QSO,...), gam (0FGL,1FGL,...), Bla (2009A&A,RBPL,...), X (2009A&A,1AXG,...), AGN (2011AJ,CGRaBS), Bz? (2022ApJS,[SRM2005]), * (USNO,Gaia), MIR (WISEA,WISE), BLL (2011NewA), Q? (2021MNRAS), G (LEDA), NIR (2MASS)
ICRS coord. (ep=J2000) : 		17 51 32.81857326 +09 39 00.7284066 (Radio) [ 0.030167 0.0305 0 ] A 2020A&A...644A.159C
FK4 coord. (ep=B1950 eq=1950) : 		17 49 10.39566261 +09 39 42.8494280 [ 0.030167 0.0305 0 ]
Gal coord. (ep=J2000) : 		034.91946135757 +17.64514124111 [ 0.030167 0.0305 0 ]
Proper motions mas/yr : 		-0.033 -0.006 [0.066 0.054 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) 81578 [~] / z(spectroscopic) 0.322 [~] / cz 96533 [~]
   D 2011NewA...16..503M
Angular size (arcmin): 		0.0000097 0.0000043 -31 (Rad) D 2010AJ....139.1713C
Fluxes (7) :
B 17.46 [~] D 2010A&A...518A..10V
V 16.78 [~] D 2010A&A...518A..10V
R 15.57 [~] D 2008ApJS..175...97H
G 16.913380 [0.021429] C 2020yCat.1350....0G
J 13.872 [0.029] C 2003yCat.2246....0C
H 13.03 [0.04] C 2003yCat.2246....0C
K 11.995 [0.022] C 2003yCat.2246....0C
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Identifiers (83) :
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4C 09.57 INTREF 862 QSO B1749+096 [CGL99] 21
1AXG J175132+0939 IVS B1749+096 QSO J1751+096 [DGT2001] B1749+096
BWE 1749+0939 JVAS B1749+096 QSO J1751+0939 [HB93] 1749+096
CGRaBS J1751+0939 JVAS J1751+0939 RBPL J1751+0939 [IN88] 1749+096
CLASS J175132.8230+093900.729 1Jy 1749+096 RFC J1751+0939 [MGL2009] BZB J1751+0939
CRATES J175132+093858 1Jy 1749+09 RGB J1751.5+0939 [MGL2009] BZU J1751+0939
2E 3965 LEDA 84878 RGB J1751+096 [MML2015] 5BZB J1751+0939
2E 1749.1+0939 MASIV J1751+0939 RORF 1749+096 [ODS2007] HFP J1751+0939
0FGL J1751.5+0935 2MASS J17513281+0939007 RX J1751.5+0938 [P82] 1749+096
1FGL J1751.5+0937 MITG J1751+0938 S3 1749+09 [SRM2005] J175132.82+093900.7
2FGL J1751.5+0938 MITG J175134+0938 S5 1749+096 [VV2000] J175132.8+093902
3FGL J1751.5+0939 MRC 1749+096 TGSSADR J175132.8+093900 [VV2003] J175132.8+093902
4FGL J1751.5+0938 NRAO 1749+09 TIC 302244526 [VV2006] J175132.8+093902
1FHL J1751.5+0938 NVSS J175132+093901 TXS 1749+096 [VV2010] J175132.8+093902
3FHL J1751.5+0938 OHIO T 081 USNO-A2.0 0975-09850990 [VV96] J175132.8+093902
FL8Y J1751.4+0938 PCCS2 143 G034.90+17.65 VSOP J1751+0939 [VV98] J175132.8+093902
GB6 B1749+0939 PKS J1751+0939 VSOP J1751+0938 EQ 1749+0939
87GB 174910.4+093921 PKS 1749+09 WB 1749+0939 Gaia DR3 4488787487759666304
GLEAM J175132+093908 PKS 1749+096 WISEA J175132.81+093900.7 Gaia DR1 4488787487759666304
ICRF J175132.8+093900 QSO B1749+095 WISE J175132.82+093900.8 Gaia DR2 4488787487759666304
IERS B1749+096 QSO J1751+09 WMAP J1751+0938

References (1007 between 1850 and 2026) (Total 1007)
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 Description of Measurements

Velocities : 5    PM : 3   

   

Observing logs
ISO : 3   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : 4C 09.57

Link by name to the catalogue in VizieR :

4C 09.57 BWE 1749+0939 2E 3965 IERS B1749+096 2MASS J17513281+0939007
MITG J1751+0938 MITG J175134+0938 NVSS J175132+093901 PKS J1751+0939 PKS 1749+09
PKS 1749+096 USNO-A2.0 0975-09850990 VSOP J1751+0939 VSOP J1751+0938 WISEA J175132.81+093900.7
WISE J175132.82+093900.8 WMAP J1751+0938 Gaia DR3 4488787487759666304 Gaia DR1 4488787487759666304 Gaia DR2 4488787487759666304

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