THE PROPER MOTION OF THE GALACTIC CENTER PULSAR RELATIVE TO SAGITTARIUS A

We measure the proper motion of the pulsar PSR J1745-2900 relative to the Galactic center massive black hole, Sgr A*, using the Very Long Baseline Array (VLBA). The pulsar has a transverse velocity of 236 + or - 11 km s super(-1) at position angle 22 + or - 2 deg east of north at a projected separat...

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Bibliographic Details
Published in:The Astrophysical journal 2015-01, Vol.798 (2), p.1-13
Main Authors: Bower, Geoffrey C, Deller, Adam, Demorest, Paul, Brunthaler, Andreas, Falcke, Heino, Moscibrodzka, Monika, O'Leary, Ryan M, Eatough, Ralph P, Kramer, Michael, Lee, K J, Spitler, Laura, Desvignes, Gregory, Rushton, Anthony P, Doeleman, Sheperd, Reid, Mark J
Format: Article
Language:English
Subjects:
ACCELERATION
Arrays
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
BLACK HOLES
Black holes (astronomy)
JETS
Massive stars
MILKY WAY
ORBITS
ORIGIN
PROBABILITY
PROPER MOTION
PULSARS
RADIAL VELOCITY
SCATTERING
Star clusters
STARS
Three dimensional
THREE-DIMENSIONAL CALCULATIONS
WAVELENGTHS
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Summary:We measure the proper motion of the pulsar PSR J1745-2900 relative to the Galactic center massive black hole, Sgr A*, using the Very Long Baseline Array (VLBA). The pulsar has a transverse velocity of 236 + or - 11 km s super(-1) at position angle 22 + or - 2 deg east of north at a projected separation of 0.097 pc from Sgr A*. Given the unknown radial velocity, this transverse velocity measurement does not conclusively prove that the pulsar is bound to Sgr A*; however, the probability of chance alignment is very small. We do show that the velocity and position are consistent with a bound orbit originating in the clockwise disk of massive stars orbiting Sgr A* and a natal velocity kick of
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/798/2/120