THE MAGNETIC-FIELD IN THE DISK OF OUR GALAXY

CORC > 北京大学 > 地球与空间科学学院

	THE MAGNETIC-FIELD IN THE DISK OF OUR GALAXY
	HAN, JL ; QIAO, GJ
刊名	astronomy astrophysics
	1994
关键词	INTERSTELLAR MEDIUM, MAGNETIC FIELDS GALAXY, STRUCTURE GALAXY, GENERAL ROTATION MEASURES SPIRAL GALAXIES LINEAR-POLARIZATION PULSAR ROTATION GALACTIC PLANE MHZ
英文摘要	The magnetic field in the disk of our Galaxy is investigated by using the Rotation Measures (RMs) of pulsars and Extragalactic Radio Sources (ERSes). Through analyses of the RMs of carefully selected pulsar samples, it is found that the Galaxy has a global field of BiSymmetric Spiral (BSS) configuration, rather than a concentric ring or an AxiSymmetric Spiral (ASS) configuration. The Galactic magnetic field of BSS structure is supposed to be of primordial origin. The pitch angle of the BSS structure is -8.2-degrees +/- 0.5-degrees. The field geometry shows that the field goes along the Carina-Sagittarius arm, which is delineated by Giant Molecular Clouds (GMCs). The amplitude of the BSS field is 1.8 +/- 0.3 muG. The first field strength maximum is at r0 = 11.9 +/- 0.15 kpc in the direction of l = 180-degrees. The field is strong in the interarm regions and it reverses in the arm regions. In the vicinity of the Sun, it has a strength of approximately 1.4 muG and reverses at 0.2-0.3 kpc in the direction of l = 0-degree. Because of the unknown electron distribution of the Galaxy and other difficulties, it is impossible to derive the galactic field from the RMs of ERSes very quantitatively. Nevertheless, the RMs of ERSes located in the region of the two galactic poles are used to estimate the vertical component of the local galactic field, which is found to have a strength of 0.2-0.3 muG and is directed from the south galactic pole to the north galactic pole. The scale height of the magnetic disk of the Galaxy is estimated from the RMs of all-sky distributed ERSes, being about 1.2+/-0.4 pc. The regular magnetic field of our Galaxy, which is probably similar to that of M81, extends far from the optical disk.; Astronomy & Astrophysics; SCI(E); 145; ARTICLE; 3; 759-772; 288
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/403129]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	HAN, JL,QIAO, GJ. THE MAGNETIC-FIELD IN THE DISK OF OUR GALAXY[J]. astronomy astrophysics,1994.
APA	HAN, JL,&QIAO, GJ.(1994).THE MAGNETIC-FIELD IN THE DISK OF OUR GALAXY.astronomy astrophysics.
MLA	HAN, JL,et al."THE MAGNETIC-FIELD IN THE DISK OF OUR GALAXY".astronomy astrophysics (1994).