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Walker, Roeland P. van der Marel, Sangmo Tony Sohn","submitted_at":"2017-07-09T15:15:23Z","abstract_excerpt":"We present new proper motion (PM) measurements of the dwarf spheroidal galaxies (dSphs) Draco and Sculptor using multi-epoch images obtained with the Hubble Space Telescope ACS/WFC. Our PM results have uncertainties far lower than previous measurements, even made with the same instrument. The PM results for Draco and Sculptor are (mu_W,mu_N)_Dra = (-0.0562+/-0.0099,-0.1765+/-0.0100) mas/yr and (mu_W,mu_N)_Scl = (-0.0296+/-0.0209,-0.1358 +/-0.0214) mas/yr. The implied Galactocentric velocity vectors for Draco and Sculptor have radial and tangential components: (V_rad,V_tan)_Dra = (-88.6,161.4) "},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1707.02593","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-07-09T15:15:23Z","cross_cats_sorted":[],"title_canon_sha256":"3eaa6caa3b8753a676e14cad211d6bd5053e7e883026d70383bc7479587daf74","abstract_canon_sha256":"4111f62213d6ba9302598ed824baf10d5389d8a6a594130ed400401d5b2fe190"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:31:19.146145Z","signature_b64":"SxusgQQOQiMY3byWKWd6pKGeKZx1l44iNJ4T1YD8L8qm9BjM33miMuTJ5/ic7tS2bg7RanalUJHz3WY6NOfzCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2cb269d349d528591bf4b3e06c50444dc8667de4676b152ff61b4911c5bac3a4","last_reissued_at":"2026-05-18T00:31:19.145350Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:31:19.145350Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Space Motions of the Dwarf Spheroidal Galaxies Draco and Sculptor based on HST Proper Motions with ~10-year Time Baseline","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Ekta Patel, Glenn van de Ven, Gurtina Besla, James S. Bullock, Louis E. Strigari, Matthew G. Walker, Roeland P. van der Marel, Sangmo Tony Sohn","submitted_at":"2017-07-09T15:15:23Z","abstract_excerpt":"We present new proper motion (PM) measurements of the dwarf spheroidal galaxies (dSphs) Draco and Sculptor using multi-epoch images obtained with the Hubble Space Telescope ACS/WFC. Our PM results have uncertainties far lower than previous measurements, even made with the same instrument. The PM results for Draco and Sculptor are (mu_W,mu_N)_Dra = (-0.0562+/-0.0099,-0.1765+/-0.0100) mas/yr and (mu_W,mu_N)_Scl = (-0.0296+/-0.0209,-0.1358 +/-0.0214) mas/yr. 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