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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
2017-07-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN0035-8711
Volume468Issue:3Pages:3289-3294
Corresponding AuthorManchester, R. N.(dick.manchester@csiro.au)
AbstractWe 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.
KeywordSun: fundamental parameters stars: distances pulsars: general
DOI10.1093/mnras/stx729
WOS KeywordMILKY-WAY ; SPATIAL-DISTRIBUTION ; SOLAR NEIGHBORHOOD ; STARS ; EVOLUTION ; DISTANCES ; CLUSTERS ; CATALOG ; GALAXY
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000402808700061
PublisherOXFORD UNIV PRESS
Citation statistics
Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/23046
Collection中国科学院紫金山天文台
Corresponding AuthorManchester, R. N.
Affiliation1.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
Recommended Citation
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.
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