Mass of the Galaxy Inferred from Outer Rotation Curve

Publications of the Astronomical Society of Japan

Sofue, Yoshiaki¹  Honma, Mareki¹ 

[1] Institute of Astronomy, Faculty of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181 E-mail (MH):

关键词: "Dark matter";    "Galaxies: Milky Way";    Rotation;   

DOI  :  10.1093/pasj/48.6.L103

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

UsinganouterrotationcurveoftheGalaxy,weexplorethegalacticconstantsΘ0andR0andthemassoftheGalaxy.WeshowthatΘ0of200kms−1ismorefavorablethantheIAUstandardvalueof220kms−1,andalsoshowthatifΘ0issmallerthan207kms−1therotationcurvebeyond2R0isdeclininginKeplerianfashion.InthecaseofΘ0=200kms−1andR0=7.6kpc,thetotalmassandtheextentoftheGalaxyinferredfromtherotationcurveare2.0±0.3×1011M⊙and15kpc,respectively.TheseresultsmaysignificantlychangethepreviousviewoftheGalaxy,thatitsouterregionisdominatedbyamassivedarkhaloextendingouttoseveraltensofkpc.

【 授权许可】

Unknown