Proper motions of dwarf spheroidal galaxies from <i>Hubble Space Telescope</i> imaging.: V.: Final measurement for Fornax

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dc.contributor.authorPiatek, Slawomir
dc.contributor.authorPryor, Carlton
dc.contributor.authorBristow, Paul
dc.contributor.authorOlszewski, Edward W.
dc.contributor.authorHarris, Hugh C.
dc.contributor.authorMateo, Mario
dc.contributor.authorMinniti, Dante
dc.contributor.authorTinney, Christopher G.
dc.date.accessioned2025-01-21T01:05:38Z
dc.date.available2025-01-21T01:05:38Z
dc.date.issued2007
dc.description.abstractThe measured proper motion of Fornax, expressed in the equatorial coordinate system, is (mu(alpha), mu(delta)) = (47.6 +/- 4.6, -36.0 +/- 4.1) mas century(-1). This proper motion is a weighted mean of four independent measurements for three distinct fields. Each measurement uses a quasi-stellar object as a reference point. Removing the contribution of the motion of the Sun and of the local standard of rest to the measured proper motion produces a Galactic rest-frame proper motion of (mu(Grf)(alpha), mu(Grf)(delta)) = (24.4 +/- 4.6, -14.3 +/- 4.1) mas century(-1). The implied space velocity with respect to the Galactic center has a radial component of V-r = -31.8 +/- 1.7 km s(-1) and a tangential component of V-t = 196 +/- 29 km s(-1). Integrating the motion of Fornax in a realistic potential for the Milky Way produces orbital elements. The perigalacticon and apogalacticon are 118 ( 66, 137) and 152 ( 144, 242) kpc, respectively, where the values in the parentheses represent the 95% confidence intervals derived from Monte Carlo experiments. The eccentricity of the orbit is 0.13 (0.11, 0.38), and the orbital period is 3.2 (2.5, 4.6) Gyr. The orbit is retrograde and inclined by 101 degrees ( 94 degrees, 107 degrees) to the Galactic plane. Fornax could be a member of a proposed "stream'' of galaxies and globular clusters; however, the membership of another proposed galaxy in the stream, Sculptor, has been previously ruled out. Fornax is in the Kroupa-Theis-Boily plane, which contains 11 of the Galactic satellite galaxies, but its orbit will take it out of that plane.
dc.fuente.origenWOS
dc.identifier.eissn1538-3881
dc.identifier.issn0004-6256
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95976
dc.identifier.wosidWOS:000244636600004
dc.issue.numero3
dc.language.isoen
dc.pagina.final844
dc.pagina.inicio818
dc.revistaAstronomical journal
dc.rightsacceso restringido
dc.subjectgalaxies : dwarf
dc.subjectgalaxies : individual (Fornax)
dc.titleProper motions of dwarf spheroidal galaxies from <i>Hubble Space Telescope</i> imaging.: V.: Final measurement for Fornax
dc.typeartículo
dc.volumen133
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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