2008A&A...492..757F


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.10CET00:42:33

2008A&A...492..757F - Astronomy and Astrophysics, volume 492, 757-766 (2008/12-4)

Observations of the Goldreich-Kylafis effect in star-forming regions with XPOL at the IRAM 30 m telescope.

FORBRICH J., WIESEMEYER H., THUM C., BELLOCHE A. and MENTEN K.M.

Abstract (from CDS):

The Goldreich-Kylafis (GK) effect causes certain molecular line emission to be weakly linearly polarized, e.g., in the presence of a magnetic field. Compared to polarized dust emission, the GK effect potentially yields additional information along the line of sight through its dependence on velocity in the line profile. Our goal was to detect polarized molecular line emission toward the DR21(OH), W3OH/H2O, G34.3+0.2, and UYSO 1 dense molecular cloud cores in transitions of rare CO isotopologues and CS. The feasibility of such observations had to be established by studying the influence of polarized sidelobes, e.g., in the presence of extended emission in the surroundings of compact sources.The observations were carried out with the IRAM 30m telescope employing the correlation polarimeter XPOL and using two orthogonally polarized receivers. We produced beam maps to investigate instrumental polarization.While a polarized signal is found in nearly all transitions toward all sources, its degree of polarization in only one case surpasses the polarization that can be expected from instrumental effects. It is shown that any emission in the polarized sidelobes of the system can produce instrumental polarization, even if the source is unpolarized. Tentative evidence of astronomically polarized line emission with pL≲1.5% was found in the CS(2-1) line toward G34.3+0.2.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: molecules - line: profiles - techniques: polarimetric

CDS comments: G34.3+0.2 is [L89b] 34.254+00.144 in Simbad.

Simbad objects: 13

goto Full paper

goto View the reference in ADS

Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 930 2
2 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 571 1
3 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 462 0
4 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 545 0
5 [MCK88] NGC 2024 FIR 5 cor 05 41 44.6 -01 55 38           ~ 91 0
6 NAME NGC 2071 IR SFR 05 47 04.4 +00 21 49           ~ 62 0
7 NAME UYSO 1 Y*O 07 05 11 -12 19.0           ~ 10 0
8 IRC +10216 C* 09 47 57.406 +13 16 43.56     10.96     C9,5e 2109 0
9 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11082 0
10 [MSL2003] W43-MM1 cor 18 47 47.0 -01 54 28           ~ 86 0
11 NAME G34.4MM Y*O 18 53 18.01 +01 25 25.6           ~ 23 2
12 OH 34.26 +0.15 SFR 18 53 18.54 +01 14 57.9           ~ 450 0
13 [MBS2007c] CygX-N44 Rad 20 39 01.01 +42 22 50.2           ~ 356 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2008A&A...492..757F and select 'bookmark this link' or equivalent in the popup menu


2019.12.10-00:42:33

© Université de Strasbourg/CNRS

    • Contact