1994A&A...292..693G

Query : 1994A&A...292..693G

1994A&A...292..693G - Astronomy and Astrophysics, volume 292693-698 (1994/12-2)

Magnetic beaming and the origin of 100% circular polarization in OH masers.

GRAY M.D. and FIELD D.

Abstract (from CDS):

An analysis is given of the evolution of the Stokes parameters for the amplification of polarized maser radiation in the presence of a magnetic field, for the case relevant to OH, in which the Zeeman splitting greatly exceeds the maser linewidth. Amplification in a σ-transition develops most strongly along the direction of the magnetic field and the beam angle which contains half the flux is shown to be ∼16deg for unsaturated amplification. This phenomenon is termed 'magnetic beaming'. The propagation of rays at high angles to the magnetic field, over longer path lengths, is strongly suppressed through effects of saturation. Magnetic beaming and saturation together give rise to >99.9% circular polarization in the maser radiation. A much more extensive account of the OH maser model, including details of the formation of σ-inversions, will be given elsewhere.

Abstract Copyright: ∼

Journal keyword(s): masers - polarization - magnetic fields - ISM: clouds

Simbad objects: 1

View the references in ADS

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	NAME W 3 OH	HII	02 27 04.1	+61 52 22						~	1064	2

Query : 1994A&A...292..693G

Basic data :

NAME W 3 OH -- HII Region
Other object types:	`IR (IRAS,IRCO,...)`, `Rad (GRS,W,...)`, `HII (1996A&AS,[BNM96])`, `SFR (2016MNRAS)`, `Cld ([RE69])`, `Mas (OH)`
ICRS coord. (ep=J2000) :	`02 27 04.1 +61 52 22 [ ] D ~`
FK4 coord. (ep=B1950 eq=1950) :	`02 23 16.7 +61 38 54 [ ]`
Gal coord. (ep=J2000) :	`133.9481 +01.0637 [ ]`
VLSR :	`-46.4 -49.0 -43.8 [0.13] (Rad)` `1996A&AS..115...81B`

Overlay

points in this preview

2MASS DSS

All

(CDSPortal)

Send to

An access of full data is available using the icon Vizier near the identifier of the catalogue

`NAME W 3 OH`	`OH 133.9+01.1`	`[BNM96] 133.943+1.059`	`[SD73] 10`
`GRS G133.90 +01.10`	`RAFGL 331`	`[KCW94] 133.947+01.064`
`IRAS 02232+6138`	`WB89 422`	`[LG97] B02232+6138`
`IRCO 3556`	`W 3(OH)`	`[RE69] 022316.8+613854`

References (1064 between 1850 and 2026) (Total 1064)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

Follow new references on this object

Collections of Measurements

Observing logs

External archives :

Data at NED - NASA/IPAC Extragalactic Database : NAME W 3 OH

Link by name to the catalogue in VizieR :

IRAS 02232+6138 RAFGL 331

Search by coordinates in Vizier (radius: 5 arcsec)

Annotations :
Annotations allow a user to add a note or report an error concerning the astronomical object and its data. It requires registration to post a note. See description .
Please, have a look at Best practices. The list of all annotations to SIMBAD objects can be found here .

The annotation server is currently not available. Sorry for any inconvenience

To bookmark this query, right click on this link: simbad:objects in 1994A&A...292..693G and select 'bookmark this link' or equivalent in the popup menu