VLBA polarization observations of BL Lac objects and passive elliptical galaxies

被引：32

作者：

Bondi, M

Marcha, MJM

Polatidis, A

Dallacasa, D

Stanghellini, C

Antón, S

机构：

[1] CNR, Ist Radioastron, I-40129 Bologna, Italy

[2] Observ Astron Lisboa, CAAUL, P-1349018 Lisbon, Portugal

[3] Max Planck Inst Radioastron, D-53121 Bonn, Germany

[4] Dipartimento Astron, I-40127 Bologna, Italy

[5] Ist Radioastron, Sez Noto, I-96017 Noto, Italy

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2004年 / 352卷 / 01期

关键词：

polarization; BL Lacertae objects : general; radio continuum : galaxies;

D O I：

10.1111/j.1365-2966.2004.07903.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present Very Long Baseline Array (VLBA) 5-GHz polarimetric observations of 23 BL Lacertae (BL Lac) objects and radio galaxies selected from the 200-mJy sample. BL Lac objects have core polarization values lower than those found in previous samples. The magnetic field geometry in the jets is not unique: both parallel and perpendicular geometries are observed, even in the same sources. The parsec-scale morphology of radio galaxies is clearly divided in two classes: one-sided core-jet sources, which show polarized emission in the core and/or jet, and two-sided symmetric objects which are not polarized. We discuss and compare the parsec-scale polarization properties of the radio cores and jets for the BL Lac objects and the radio galaxies in relation to their parsec-scale morphology and high-frequency integrated spectral index.

引用

页码：112 / 124

页数：13

共 49 条

[1] The spectral energy distributions of the revised 200-mJy sample [J].