2019ApJ...876...54D

Query : 2019ApJ...876...54D

2019ApJ...876...54D - Astrophys. J., 876, 54-54 (2019/May-1)

Intensity-coupled polarization in instruments with a continuously rotating half-wave plate.

DIDIER J., MILLER A.D., ARAUJO D., AUBIN F., GEACH C., JOHNSON B., KOROTKOV A., RAACH K., WESTBROOK B., YOUNG K., ABOOBAKER A.M., ADE P., BACCIGALUPI C., BAO C., CHAPMAN D., DOBBS M., GRAINGER W., HANANY S., HELSON K., HILLBRAND S., HUBMAYR J., JAFFE A., JONES T.J., KLEIN J., LEE A., LIMON M., MacDERMID K., MILLIGAN M., PASCALE E., REICHBORN-KJENNERUD B., SAGIV I., TUCKER C., TUCKER G.S. and ZILIC K.

Abstract (from CDS):

We discuss a systematic effect associated with measuring polarization with a continuously rotating half-wave plate (HWP). The effect was identified with the data from the E and B Experiment, which was a balloon-borne instrument designed to measure the polarization of the cosmic microwave background (CMB) as well as that from Galactic dust. The data show polarization fractions larger than 10%, while less than 3% were expected from instrumental polarization. We give evidence that the excess polarization is due to detector nonlinearity in the presence of a continuously rotating HWP. The nonlinearity couples intensity signals to polarization. We develop a map-based method to remove the excess polarization. Applying this method to the 150 (250) GHz band data, we find that 81% (92%) of the excess polarization was removed. Characterization and mitigation of this effect are important for future experiments aiming to measure the CMB B-modes with a continuously rotating HWP.

Journal keyword(s): balloons - cosmic background radiation - instrumentation: polarimeters - methods: data analysis - polarization - 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	RCW 38	SFR	08 59 05.50	-47 30 39.4						~	327	2

Query : 2019ApJ...876...54D

Basic data :

RCW 38 -- Star Forming Region
Other object types:	`SFR ()`, `Rad (GRS,Kes,...)`, `HII (RCW,[HBB99],...)`, `* (MHR)`
ICRS coord. (ep=J2000) :	`08 59 05.50 -47 30 39.4 [ ] D ~`
FK4 coord. (ep=B1950 eq=1950) :	`08 57 23.57 -47 18 56.1 [ ]`
Gal coord. (ep=J2000) :	`267.94067 -01.05770 [ ]`

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`GAL 268.0-01.1`	`Kes 5`	`[GS70] 268.0-01.0`	`[WMG70] 268.0-01.1`
`GRS G267.94 -01.03`	`MHR 5`	`[HBB99] 268.034-0.984`
`GRS G267.94 -01.06`	`MSH 08-4-07`	`[KC97c] G268.0-01.0`
`GRS G268.00 -01.10`	`RCW 38`	`[SG70] 268.0-1.1`

References (327 between 1850 and 2026) (Total 327)
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Data at NED - NASA/IPAC Extragalactic Database : RCW 38

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