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J/AJ/149/42 Proper motion of Draco dwarf galaxy from HST (Pryor+, 2015)
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Beginning of ReadMe :J/AJ/149/42 Proper motion of Draco dwarf galaxy from HST (Pryor+, 2015)
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Proper motion of the Draco dwarf galaxy based on Hubble Space Telescope imaging.
Pryor C., Piatek S., Olszewski E.W.
<Astron. J., 149, 42 (2015)>
=2015AJ....149...42P
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ADC_Keywords: Galaxies, nearby ; Proper motions
Keywords: astrometry - galaxies: dwarf - galaxies: individual: Draco -
proper motions
Abstract:
We have measured the proper motion of the Draco dwarf galaxy using
images at two epochs with a time baseline of about two years taken
with the Hubble Space Telescope Advanced Camera for Surveys. Wide
Field Channels 1 and 2 provide two adjacent fields, each containing a
known QSO. The zero point for the proper motion is determined using
both background galaxies and the QSOs and the two methods produce
consistent measurements within each field. Averaging the results from
the two fields gives a proper motion in the equatorial coordinate
system of
(mu_alpha_,mu_delta_)=(-17.7+/-6.3,-22.1+/-6.3)mas/century and
in the Galactic coordinate system of
(mu_l_,mu_b_)=(-23.1+/-6.3,-16.3+/-6.3)mas/century. Removing the
contributions of the motion of the Sun and of the LSR to the measured
proper motion yields a Galactic rest-frame proper motion of
(mu_alpha_^Grf^,(mu_delta_^Grf^)=(51.4+/-6.3,-18.7+/-6.3)mas/century
and (mu_l_^Grf^,(mu_b_^Grf^)=(-21.8+/-6.3,-50.1+/-6.3)mas/century.
The implied space velocity with respect to the Galactic center is
(Pi,Theta,Z)=27+/-14,89+/-25,-212+/-20)km/s. This velocity implies
that the orbital inclination is 70deg, with a 95% confidence
interval of (59deg,80deg), and that the plane of the orbit is
consistent with that of the vast polar structure (VPOS) of Galactic
satellite galaxies.
Description:
We obtained first-epoch images for three distinct pointings in the
direction of Draco using the Advanced Camera for Surveys (ACS) and
Wide Field Channel (WFC) combination on HST in cycle 13 (based on
observations with the NASA/ESA Hubble Space Telescope, obtained at the
Space Telescope Science Institute, which is operated by the
Association of Universities for Research in Astronomy, Inc., under
NASA contract NAS 5-26555. The observations are associated with
programs 10229 and 10812). For each pointing, WFC1 is centered on a
spectroscopically-confirmed QSO. Ideally, second-epoch imaging would
be obtained with the same detector. However, only one pointing was
imaged in cycle 15 before the failure of ACS; the failure forced the
other two to be imaged with the WFPC2. Table 2 summarizes the
observations.