PROPER MOTION OF THE SAGITTARIUS DWARF GALAXY BASED ON HUBBLE SPACE TELESCOPE IMAGING

Pryor, Carlton; Piatek, Slawomir

doi:10.1088/0004-6256/139/3/839; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)

Title: PROPER MOTION OF THE SAGITTARIUS DWARF GALAXY BASED ON HUBBLE SPACE TELESCOPE IMAGING

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Abstract

We have derived a proper motion of Sagittarius using archival data obtained with the Hubble Space Telescope. The data consist of imaging at three epochs with a time baseline of about four years in three distinct fields. The zero point for the proper motion is based on the foreground Galactic stellar populations along the line of sight. The measured proper motion in the Galactic coordinate system is ({mu}{sub l}, {mu} {sub b}) = (-2.615 {+-} 0.22, 1.87 {+-} 0.19) mas yr{sup -1} and in the equatorial coordinate system is ({mu}{sub {alpha}}, {mu}{sub {delta}}) = (-2.75 {+-} 0.20, - 1.65 {+-} 0.22) mas yr{sup -1}. Removing the contribution of the motion of the Sun and of the LSR to the measured proper motion produces a Galactic rest-frame proper motion of ({mu}{sup Grf} {sub l}, {mu}{sup Grf} {sub b}) = (-0.82 {+-} 0.22, 1.98 {+-} 0.19) mas yr{sup -1} and ({mu}{sup Grf} {sub {alpha}}, {mu}{sup Grf} {sub {delta}}) = (-2.14 {+-} 0.20, 0.03 {+-} 0.20) mas yr{sup -1}. The implied space velocity with respect to the Galactic center is ({pi}, {theta}, Z) = (141.9 {+-} 6.9, 117 {+-} 29, 238 {+-} 27) km s{sup -1}. This velocity implies that the instantaneous orbitalmore »« less

Authors:

Pryor, Carlton ^[1]; Piatek, Slawomir ^[2]

Department of Physics and Astronomy, Rutgers, State University of New Jersey, 136 Frelinghuysen Road, Piscataway, NJ 08854-8019 (United States)
Department of Physics, New Jersey Institute of Technology, Newark, NJ 07102 (United States)

Publication Date:: Mon Mar 15 00:00:00 EDT 2010

OSTI Identifier:: 21301299

Resource Type:: Journal Article

Journal Name:: Astronomical Journal (New York, N.Y. Online)

Additional Journal Information:: Journal Volume: 139; Journal Issue: 3; Other Information: DOI: 10.1088/0004-6256/139/3/839; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1538-3881

Country of Publication:: United States

Language:: English

Subject:: 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; 99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE; COLOR; COORDINATES; DWARF STARS; GALAXIES; PHOTOMETRY; PROPER MOTION; SUN; TELESCOPES

Citation Formats


                    Pryor, Carlton, Piatek, Slawomir, and Olszewski, Edward W. PROPER MOTION OF THE SAGITTARIUS DWARF GALAXY BASED ON HUBBLE SPACE TELESCOPE IMAGING.  United States: N. p., 2010. 
        Web.  doi:10.1088/0004-6256/139/3/839; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).

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                    Pryor, Carlton, Piatek, Slawomir, & Olszewski, Edward W. PROPER MOTION OF THE SAGITTARIUS DWARF GALAXY BASED ON HUBBLE SPACE TELESCOPE IMAGING.  United States.  https://doi.org/10.1088/0004-6256/139/3/839; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)

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                    Pryor, Carlton, Piatek, Slawomir, and Olszewski, Edward W. 2010.  
        "PROPER MOTION OF THE SAGITTARIUS DWARF GALAXY BASED ON HUBBLE SPACE TELESCOPE IMAGING".  United States.  https://doi.org/10.1088/0004-6256/139/3/839; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).

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@article{osti_21301299,

  title        = {PROPER MOTION OF THE SAGITTARIUS DWARF GALAXY BASED ON HUBBLE SPACE TELESCOPE IMAGING},

  author       = {Pryor, Carlton and Piatek, Slawomir and Olszewski, Edward W.},

  abstractNote = {We have derived a proper motion of Sagittarius using archival data obtained with the Hubble Space Telescope. The data consist of imaging at three epochs with a time baseline of about four years in three distinct fields. The zero point for the proper motion is based on the foreground Galactic stellar populations along the line of sight. The measured proper motion in the Galactic coordinate system is ({mu}{sub l}, {mu} {sub b}) = (-2.615 {+-} 0.22, 1.87 {+-} 0.19) mas yr{sup -1} and in the equatorial coordinate system is ({mu}{sub {alpha}}, {mu}{sub {delta}}) = (-2.75 {+-} 0.20, - 1.65 {+-} 0.22) mas yr{sup -1}. Removing the contribution of the motion of the Sun and of the LSR to the measured proper motion produces a Galactic rest-frame proper motion of ({mu}{sup Grf} {sub l}, {mu}{sup Grf} {sub b}) = (-0.82 {+-} 0.22, 1.98 {+-} 0.19) mas yr{sup -1} and ({mu}{sup Grf} {sub {alpha}}, {mu}{sup Grf} {sub {delta}}) = (-2.14 {+-} 0.20, 0.03 {+-} 0.20) mas yr{sup -1}. The implied space velocity with respect to the Galactic center is ({pi}, {theta}, Z) = (141.9 {+-} 6.9, 117 {+-} 29, 238 {+-} 27) km s{sup -1}. This velocity implies that the instantaneous orbital inclination is 67 deg., with a 95% confidence interval of (58 deg., 79 deg.). We also present photometry and membership probabilities for the stars in our sample, which can be used to generate color-magnitude diagrams for stellar populations selected by proper motion.},

  doi          = {10.1088/0004-6256/139/3/839; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)},

  url          = {https://www.osti.gov/biblio/21301299},
  journal      = {Astronomical Journal (New York, N.Y. Online)},

  issn         = {1538-3881},

  number       = 3,

  volume       = 139,

  place        = {United States},

  year         = {Mon Mar 15 00:00:00 EDT 2010},

  month        = {Mon Mar 15 00:00:00 EDT 2010}

}

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https://doi.org/10.1088/0004-6256/139/3/839; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)

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