Rotation Curve of a Spiral Galaxy · Rotation curve o Milky wa stays flat with k100 distance Distance from center( kpc)- How To Use Credits
• Rotation curve of Milky Way stays flat with distance
120° 150°180°150° 120° Perseus Outer Vo=220 kmys 90 90° Ro=8 M=XO kry -60 60° GC -30 O° 30°
140 Vo=220 km/s Ro=8 kpc 120 100 80 60 -20 40 10 15 Distance(kpc Calculated radial velocity as a function of distance along a line of sight in the Galactic plane at 1=29.7 degree Formula: Vr= Ro sin /(V(R)/R-Voro).V(R): circular orbit speed of a star; R: Galactocentric radius, Vr radial velocity
Calculated radial velocity as a function of distance along a line of sight in the Galactic plane at l = 29.7 degree Formula: Vr= Ro sin l (V(R)/R – Vo/Ro). V(R):circular orbit speed of a star; R:Galactocentric radius; Vr:radial velocity
The long-standing puzzle on Kes 75/PSrJ1846-0258 is resolved ( Leahy& Tian,2008,A&A,480,L25.已7次独立列用改写了前面的结 果 Becker&He!an1984,4J,283,154,被引用36次) 1. Significant distance revision from 19 kpc to 6 kpc for Kes 75 gives a normal explosion energy(-2x10e51 erg)from a core collapse, contrary to the highly implausible value( 10E53 erg)for an extremely high X-ray luminosity for Kes 75 (4x10E37 ergs/s) obtained previously due to d 19 kpc 2. Small radius 3 pc(1.6)for Kes 75 argues that it harbors a Crab-like rotation powered young pulsar J1846-0258 and PWN (723--884 yr), rather than the previous inferred, much higher ratio of the pulsar-plus-nebula luminosity to spin-down luminosity
The long-standing puzzle on Kes 75/PSR J1846-0258 is resolved (Leahy & Tian, 2008, A&A, 480, L25. 已7次独立引用, 改写了前面的结 果:Becker & Helfand, 1984, ApJ, 283, 154,被引用36次) 1. Significant distance revision from ~19 kpc to ~ 6 kpc for Kes 75 gives a normal explosion energy (~2x10E51 erg) from a core collapse, contrary to the highly implausible value (~10E53 erg) for an extremely high X-ray luminosity for Kes 75 (~4x10E37 ergs /s) obtained previously due to d ~ 19 kpc. 2. Small radius ~ 3 pc (1.6') for Kes 75 argues that it harbors a Crab-like rotation powered young pulsar J1846-0258 and PWN (723--884 yr) , rather than the previous inferred, much higher ratio of the pulsar-plus-nebula luminosity to spin-down luminosity