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ERRATUM: "THE PROPER MOTION OF THE GALACTIC CENTER PULSAR RELATIVE TO SAGITTARIUS A*" (2015, ApJ, 798, 120)

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Published 2016 April 22 • © 2016. The American Astronomical Society. All rights reserved.
, , Citation Geoffrey C. Bower et al 2016 ApJ 821 133 DOI 10.3847/0004-637X/821/2/133

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1 Academia Sinica Institute of Astronomy and Astrophysics, 645 N. A'ohoku Place, Hilo, HI 96720, USA; gbower@asiaa.sinica.edu.tw

2 ASTRON, P.O. Box 2, 7990 AA Dwingeloo, The Netherlands

3 NRAO, 520 Edgemont Road, Charlottesville, VA 22903-2475, USA

4 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany

5 Department of Astrophysics, Institute for Mathematics, Astrophysics and Particle Physics (IMAPP), Radboud University, PO Box 9010, 6500 GL Nijmegen, The Netherlands

6 JILA, University of Colorado and NIST, 440 UCB, Boulder, CO 80309-0440, USA

7 Jodrell Bank Centre of Astrophysics, University of Manchester, Manchester M13 9PL, UK

8 Department of Physics, Astrophysics, University of Oxford, Keble Road, Oxford OX1 3RH, UK

9 School of Physics and Astronomy, University of Southampton, Highfield, Southampton SO17 1BJ, UK

10 MIT Haystack Observatory, Route 40, Westford, MA 01886, USA

11 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA

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  1. Received 2016 March 11
  2. Accepted 2016 March 12
  3. Published

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0004-637X/821/2/133

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We used an incorrect value for the ICRF position of Sgr A* at the specified reference date to determine the relative position of the magnetar, PSR J1745-2900, in our analysis. The correct value for the Sgr A* position is 17h45m40.0366s, −29d00'28farcs217 at epoch MJD = 56710. ICRF positions reported for the magnetar are correct as reported in the paper, but relative positions should be adjusted by (+18.36, −32.0) mas. This applies to individual epoch positions reported in columns 6 and 7 of Table 2 and the mean fitted positions reported in rows 1 and 2 of Table 4. For example, the correct fitted offset position using the proper motion bootstrap technique in Table 4 is +1700.53, −1679.41 mas. The relative positions in Figure 1 should be shifted by the same offset. Proper motion, acceleration, and core shift values are unaffected. There are no changes in the interpretation of the results.

Figure 1.

Figure 1. Position as a function of time for PSR J1745-2900 relative to Sgr A*. Different colors are used to identify the wavelength of observations. The solid black line shows the best-fit proper motion in each coordinate (see, text for details of the fit).

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Table 2.  Observed Positions of PSR J1745-2900

MJD Band Flux Density ICRF RA ICRF Dec. ${\rm{\Delta }}\alpha $ ${\rm{\Delta }}\delta $
    (mJy) (J2000) (J2000) (mas) (mas)
56422 X 0.56 17 45 40.166377 ± 0.000020 −29 00 29.8960 ± 00.0002 1699.97 ± 0.26 −1683.38 ± 0.20
56444 X 0.76 17 45 40.166327 ± 0.000012 −29 00 29.8962 ± 00.0001 1699.50 ± 0.16 −1683.24 ± 0.10
56473 Ku 0.58 17 45 40.166263 ± 0.000008 −29 00 29.8962 ± 00.0001 1698.91 ± 0.10 −1682.80 ± 0.10
56486 X 1.47 17 45 40.166222 ± 0.000008 −29 00 29.8965 ± 00.0001 1698.49 ± 0.10 −1682.90 ± 0.10
56658 Ku 2.09 17 45 40.166264 ± 0.000007 −29 00 29.8960 ± 00.0001 1700.52 ± 0.09 −1679.79 ± 0.10
... X 1.18 17 45 40.166276 ± 0.000010 −29 00 29.8960 ± 00.0001 1700.68 ± 0.13 −1679.79 ± 0.10
56710 Ku 1.07 17 45 40.166249 ± 0.000005 −29 00 29.8960 ± 00.0001 1700.77 ± 0.07 −1679.00 ± 0.10
... X 0.94 17 45 40.166237 ± 0.000014 −29 00 29.8962 ± 00.0002 1700.62 ± 0.18 −1679.20 ± 0.20
56750 K 0.92 17 45 40.166235 ± 0.000004 −29 00 29.8961 ± 00.0001 1700.94 ± 0.05 −1678.49 ± 0.10
... Q 0.54 17 45 40.166238 ± 0.000003 −29 00 29.8959 ± 00.0001 1700.98 ± 0.04 −1678.29 ± 0.10
56772 X 1.00 17 45 40.166246 ± 0.000016 −29 00 29.8958 ± 00.0002 1701.27 ± 0.21 −1677.86 ± 0.20
... Ku 1.22 17 45 40.166204 ± 0.000008 −29 00 29.8961 ± 00.0001 1700.72 ± 0.10 −1678.16 ± 0.10
56892 Ku 0.63 17 45 40.166196 ± 0.000028 −29 00 29.8959 ± 00.0003 1701.65 ± 0.37 −1676.15 ± 0.30
56899 K 0.26 17 45 40.166250 ± 0.000025 −29 00 29.8959 ± 00.0003 1702.42 ± 0.33 −1676.06 ± 0.30
... Q 0.15 17 45 40.166215 ± 0.000005 −29 00 29.8958 ± 00.0001 1701.95 ± 0.07 −1675.90 ± 0.10

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Table 4.  Proper Motion Fits for PSR J1745-2900

Parameter Units PM Bootstrap PM LSQ PM + Accel. PM + Core Shift
${\rm{\Delta }}{\alpha }_{0}$ (mas) 1700.53 ± 0.07 1700.52 ± 0.07 1700.54 ± 0.09 1700.52 ± 0.19
${\rm{\Delta }}{\delta }_{0}$ (mas) −1679.41 ± 0.03 −1679.41 ± 0.03 −1679.42 ± 0.05 −1679.35 ± 0.10
${\mu }_{\alpha }$ (mas/yr) 2.45 ± 0.33 2.50 ± 0.22 2.49 ± 0.23 2.51 ± 0.31
${\mu }_{\delta }$ (mas/yr) 5.88 ± 0.11 5.90 ± 0.09 5.92 ± 0.10 5.84 ± 0.12
aα (mas/yr2) ... ... −0.2 ± 1.0 ...
aδ (mas/yr2) ... ... 0.2 ± 0.5 ...
${{\rm{\Phi }}}_{\alpha }$ (mas/cm) ... ... ... −0.00 ± 0.10
${{\rm{\Phi }}}_{\delta }$ (mas/cm) ... ... ... 0.03 ± 0.05
${\chi }_{\alpha }^{2}/{d.o.f.}_{\alpha }$ ... ... 112.3/13 111.8/12 112.3/12
${\chi }_{\delta }^{2}/{d.o.f.}_{\delta }$ ... ... 17.0/13 16.8/12 16.5/12

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10.3847/0004-637X/821/2/133