2004MNRAS.349.1365S

Query : 2004MNRAS.349.1365S

2004MNRAS.349.1365S - Mon. Not. R. Astron. Soc., 349, 1365-1380 (2004/April-3)

Contaminants in ATCA baselines with shadowing: a case study of cross-talk in short-spacing interferometers.

SUBRAHMANYAN R. and DESHPANDE A.A.

Abstract (from CDS):

Interferometric telescopes made of close-packed antenna elements are an important tool for imaging extended radio sources, specifically structures that have angular sizes comparable to or even greater than the full width at half maximum of the beams of the antennas. They have proved useful in observations of cosmic microwave background anisotropies that require high brightness sensitivity. However, the visibilities measured in baselines formed between close antenna elements - in particular, between shadowed elements - of Fourier-synthesis arrays are often observed to be corrupted. We discuss the multiplicative and additive errors affecting such short-baseline interferometers.

As a case study, we have examined the nature of the spurious correlations between the Cassegrain-type paraboloidal reflectors that are elements of the Australia Telescope Compact Array. In configurations with geometric shadowing, the cross-talk here appears as an additive component. Analysis of the characteristics of this cross-talk leads us to believe that when these reflector antennas are in a shadowed configuration, the receivers in the antenna pair pick up correlated emission from opposite sides of the main reflector surface of the front antenna. The slots between the panels that make up the main reflector surface provide the pathway for the coupling across the reflector surface. This mode of cross-talk may be avoided by constructing the main reflectors of short-spacing interferometers as continuous conducting surfaces.

Abstract Copyright: 2004 RAS

Journal keyword(s): atmospheric effects - instrumentation: interferometers - techniques: interferometric - telescopes - cosmic microwave background - cosmology: observations

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	QSO B1741-038	Bla	17 43 58.85613537	-03 50 04.6167326			20.40	17.98		~	583	1

Query : 2004MNRAS.349.1365S

Basic data :

QSO B1741-038 -- Blazar

Rad (2010AJ,GLEAM,...), QSO (2009ApJS,QSO,...), gam (3EG,1FGL,...), Bla (2009A&A,[MGL2009],...), X (2009A&A,RX,...), MIR (WISEA,WISE), AGN (CGRaBS), Q? (2021MNRAS), AG? (2022ApJS), G (LEDA), * (Gaia), NIR (2MASS)

17 43 58.85613537 -03 50 04.6167326 (Radio) [ 0.0302784 0.0305 0 ] A 2020A&A...644A.159C

17 41 20.62182890 -03 48 48.8771625 [ 0.0302784 0.0305 0 ]

021.59106696886 +13.12741363212 [ 0.0302784 0.0305 0 ]

-0.029 0.090 [0.149 0.113 90] A 2020yCat.1350....0G

V(km/s) 184543 [~] / z(spectroscopic) 1.05 [~] / cz 314782 [~] (Opt) D 2017ApJS..233....3T

0.0035 [0.1413] A 2020yCat.1350....0G

0.0000127 0.0000055 2 (Rad) D 2010AJ....139.1713C

V 20.40 [~] D 2010ApJ...710..764K

R 17.98 [~] D 2008ApJS..175...97H

G 18.134712 [0.005867] C 2020yCat.1350....0G

J 15.731 [0.055] C 2003yCat.2246....0C

H 14.893 [0.057] C 2003yCat.2246....0C

K 13.927 [0.047] C 2003yCat.2246....0C

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`QSO B1741-038`	`2MASS J17435886-0350045`	`1RXS J174358.8-034958`	`[MGL2009] BZQ J1743-0350`
`CGRaBS J1743-0350`	`MRC 1741-038`	`SQUAD DR1 J174358-035004`	`[MML2015] 5BZQ J1743-0350`
`3EG J1744-0310`	`NEWPS5 J1743-0350`	`SRGA J174400.1-035013`	`[P82] 1741-038`
`1FGL J1744.6-0354`	`NVSS J174358-035004`	`TGSSADR J174358.7-035005`	`[VV2000] J174358.8-035005`
`3FGL J1744.3-0353`	`OHIO T -068`	`TIC 41124008`	`[VV2003] J174358.8-035005`
`4FGL J1744.2-0353`	`PKS 1741-03`	`TXS 1741-038`	`[VV2006] J174358.8-035005`
`FL8Y J1744.2-0353`	`PKS J1743-0350`	`VSOP J1743-0350`	`[VV2010] J174358.8-035005`
`GLEAM J174358-035004`	`PKS 1741-038`	`WB 1741-0348`	`[VV96] J174358.8-035005`
`ICRF J174358.8-035004`	`PMN J1743-0350`	`WISEA J174358.84-035004.7`	`[VV98] J174358.8-035005`
`IERS B1741-038`	`QSO B1741-0348`	`WISE J174358.84-035004.5`	`[WCO2009] J174356-034842`
`INTREF 817`	`QSO B1741-03`	`WMAP J1743-0350`	`[WPW2003] J1743-0350`
`IVS B1741-038`	`QSO J1743-0350`	`[CGL99] 20`	`Gaia DR3 4176506462983010176`
`1Jy 1741-03`	`RFC J1743-0350`	`[GGR94] 1741-038`	`Gaia DR1 4176506462983010176`
`1Jy 1741-038`	`RORF 1741-038`	`[GR92] 1741-038`	`Gaia DR2 4176506462983010176`
`LEDA 2829362`	`RX J1743.9-0349`	`[HB93] 1741-038`

References (583 between 1850 and 2026) (Total 583)
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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Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : QSO B1741-038

Link by name to the catalogue in VizieR :

`3EG J1744-0310`	`IERS B1741-038`	`2MASS J17435886-0350045`	`NVSS J174358-035004`	`PKS 1741-03`
`PKS J1743-0350`	`PKS 1741-038`	`PMN J1743-0350`	`1RXS J174358.8-034958`	`VSOP J1743-0350`
`WISEA J174358.84-035004.7`	`WISE J174358.84-035004.5`	`WMAP J1743-0350`	`Gaia DR3 4176506462983010176`	`Gaia DR1 4176506462983010176`
`Gaia DR2 4176506462983010176`

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