Determination of the Sun's offset from the Galactic plane using pulsars

doi:10.1093/mnras/stx729

	Determination of the Sun's offset from the Galactic plane using pulsars
	Yao, J. M.1,2; Manchester, R. N.3; Wang, N.1,4
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2017-07-01
卷号	468 期号:3 页码:3289-3294
关键词	Sun: fundamental parameters stars: distances pulsars: general
ISSN号	0035-8711
DOI	10.1093/mnras/stx729
通讯作者	Manchester, R. N.(dick.manchester@csiro.au)
英文摘要	We derive the Sun's offset from the local mean Galactic plane (z(circle dot)) using the observed z-distribution of young pulsars. Pulsar distances are obtained from measurements of annual parallax, HI absorption spectra or associations where available and otherwise from the observed pulsar dispersion and a model for the distribution of free electrons in the Galaxy. We fit the cumulative distribution function for a sech(2)(z)-distribution function, representing an isothermal self-gravitating disc, with uncertainties being estimated using the bootstrap method. We take pulsars having characteristic age tau(c) less than or similar to 10(6.5) yr and located within 4.5 kpc of the Sun, omitting those within the local spiral arm and those significantly affected by the Galactic warp, and solve for z(circle dot) and the scaleheight, H, for different cut-offs in tau(c). We compute these quantities using just the independently determined distances and these together with dispersion measure (DM)-based distances separately using the YMW16 and NE2001 Galactic electron density models. We find that an age cut-off at 10(5.75) yr with YMW16 DM distances gives the best results with a minimum uncertainty in z(circle dot) and an asymptotically stable value for H showing that, at this age and below, the observed pulsar z-distribution is dominated by the dispersion in their birth locations. From this sample of 115 pulsars, we obtain z(circle dot) = 13.4 +/- 4.4 pc and H = 56.9 +/- 6.5 pc, similar to estimated scaleheights for OB stars and open clusters. Consistent results are obtained using the independent-only distances and using the NE2001 model for the DM-based distances.
WOS关键词	MILKY-WAY ; SPATIAL-DISTRIBUTION ; SOLAR NEIGHBORHOOD ; STARS ; EVOLUTION ; DISTANCES ; CLUSTERS ; CATALOG ; GALAXY
WOS研究方向	Astronomy & Astrophysics
语种	英语
出版者	OXFORD UNIV PRESS
WOS记录号	WOS:000402808700061
内容类型	期刊论文
源URL	[http://libir.pmo.ac.cn/handle/332002/23045]
专题	中国科学院紫金山天文台
通讯作者	Manchester, R. N.
作者单位	1.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Xinjiang, Peoples R China 2.Univ Chinese Acad Sci, 19A Yuquan Rd, Beijing 100049, Peoples R China 3.Australia Telescope Natl Facil, CSIRO Astron & Space Sci, POB 76, Epping, NSW 1710, Australia 4.Chinese Acad Sci, Key Lab Radio Astron, Nanjing 210008, Jiangsu, Peoples R China
推荐引用方式 GB/T 7714	Yao, J. M.,Manchester, R. N.,Wang, N.. Determination of the Sun's offset from the Galactic plane using pulsars[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2017,468(3):3289-3294.
APA	Yao, J. M.,Manchester, R. N.,&Wang, N..(2017).Determination of the Sun's offset from the Galactic plane using pulsars.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,468(3),3289-3294.
MLA	Yao, J. M.,et al."Determination of the Sun's offset from the Galactic plane using pulsars".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 468.3(2017):3289-3294.