Proper Motions of Milky Way Ultra-faint Satellites with Gaia DR2 × DES DR1

Pace, Andrew B.; Li, Ting S.

doi:10.3847/1538-4357/ab0aee

Title: Proper Motions of Milky Way Ultra-faint Satellites with Gaia DR2 × DES DR1

Journal Article · Wed Apr 17 00:00:00 EDT 2019 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/ab0aee· OSTI ID:1511665

^[1];

^[2]

Texas A & M Univ., College Station, TX (United States)
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Univ. of Chicago, Chicago, IL (United States)

We present a new, probabilistic method for determining the systemic proper motions of Milky Way (MW) ultra-faint satellites in the Dark Energy Survey (DES). We utilize the superb photometry from the first public data release (DR1) of the DES to select candidate members and cross-match them with the proper motions from the Gaia DR2. We model the candidate members with a mixture model (satellite and MW) in spatial and proper motion space. This method does not require prior knowledge of satellite membership and can successfully determine the tangential motion of 13 DES satellites. With our method, we present measurements of the following satellites: Columba I, Eridanus III, Grus II, Phoenix II, Pictor I, Reticulum III, and Tucana IV. This is the first systemic proper motion measurement for several of these satellites, and the majority lack extensive spectroscopic follow-up studies. We compare these to the predictions of Large Magellanic Cloud satellites and the vast polar structure. With the high-precision DES photometry, we conclude that most of the newly identified member stars are very metal-poor ([Fe/H] ≲ –2), similar to other ultra-faint dwarf galaxies, while Reticulum III is likely more metal-rich. We also find potential members in the following satellites that might indicate their overall proper motion: Cetus II, Kim 2, and Horologium II. Furthermore, due to the small number of members in each satellite, spectroscopic follow-up observations are necessary to determine the systemic proper motion in these satellites.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-07CH11359

OSTI ID:: 1511665

Report Number(s):: arXiv:1806.02345; FERMILAB-PUB-18-768-A; 1730707

Journal Information:: The Astrophysical Journal (Online), Vol. 875, Issue 1; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 53 works

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Segue 2: The Least Massive Galaxy Kirby, Evan N.; Boylan-Kolchin, Michael; Cohen, Judith G. arXiv https://doi.org/10.48550/arxiv.1304.6080	text	January 2013
Search for Gamma-Ray Emission from DES Dwarf Spheroidal Galaxy Candidates with Fermi-LAT Data Collaboration, Lat; Collaboration, The DES; Drlica-Wagner, A. arXiv https://doi.org/10.48550/arxiv.1503.02632	text	January 2015
Hydra II: a faint and compact Milky Way dwarf galaxy found in the Survey of the Magellanic Stellar History Martin, Nicolas F.; Nidever, David L.; Besla, Gurtina arXiv https://doi.org/10.48550/arxiv.1503.06216	text	January 2015
Taking Care of Business in a Flash: Constraining the Timescale for Low-Mass Satellite Quenching with ELVIS Fillingham, Sean P.; Cooper, Michael C.; Wheeler, Coral arXiv https://doi.org/10.48550/arxiv.1503.06803	text	January 2015
Stellar Kinematics and Metallicities in the Ultra-Faint Dwarf Galaxy Reticulum II Simon, J. D.; Drlica-Wagner, A.; Li, T. S. arXiv https://doi.org/10.48550/arxiv.1504.02889	text	January 2015
Kinematics and chemistry of recently discovered Reticulum 2 and Horologium 1 dwarf galaxies Koposov, Sergey E.; Casey, Andrew R.; Belokurov, Vasily arXiv https://doi.org/10.48550/arxiv.1504.07916	text	January 2015
Local ultra faint dwarves as a product of Galactic processing during a Magellanic group infall Yozin, C.; Bekki, K. arXiv https://doi.org/10.48550/arxiv.1508.01031	text	January 2015
Digging deeper into the Southern skies: a compact Milky-Way companion discovered in first-year Dark Energy Survey data Luque, E.; Queiroz, A.; Santiago, B. arXiv https://doi.org/10.48550/arxiv.1508.02381	text	January 2015
Eight Ultra-faint Galaxy Candidates Discovered in Year Two of the Dark Energy Survey Collaboration, The DES; Drlica-Wagner, A.; Bechtol, K. arXiv https://doi.org/10.48550/arxiv.1508.03622	text	January 2015
Magellan/M2FS Spectroscopy of Tucana 2 and Grus 1 Walker, Matthew G.; Mateo, Mario; Olszewski, Edward W. arXiv https://doi.org/10.48550/arxiv.1511.06296	text	January 2015
Identifying true satellites of the Magellanic Clouds Sales, Laura V.; Navarro, Julio F.; Kallivayalil, Nitya arXiv https://doi.org/10.48550/arxiv.1605.03574	text	January 2016
An Ultra-Faint Galaxy Candidate Discovered in Early Data from the Magellanic Satellites Survey Drlica-Wagner, A.; Bechtol, K.; Allam, S. arXiv https://doi.org/10.48550/arxiv.1609.02148	text	January 2016
Farthest Neighbor: The Distant Milky Way Satellite Eridanus II Li, T. S.; Simon, J. D.; Drlica-Wagner, A. arXiv https://doi.org/10.48550/arxiv.1611.05052	text	January 2016
Searches for New Milky Way Satellites from the First Two Years of Data of the Subaru/Hyper Suprime-Cam Survey: Discovery of Cetus~III Homma, Daisuke; Chiba, Masashi; Okamoto, Sakurako arXiv https://doi.org/10.48550/arxiv.1704.05977	text	January 2017
On the nature of ultra-faint dwarf galaxy candidates I: DES1, Eridanus III and Tucana V Conn, Blair C.; Jerjen, Helmut; Kim, Dongwon arXiv https://doi.org/10.48550/arxiv.1712.01439	text	January 2017
Discovery of two neighboring satellites in the Carina constellation with MagLiteS Torrealba, G.; Belokurov, V.; Koposov, S. E. arXiv https://doi.org/10.48550/arxiv.1801.07279	text	January 2018
Chemical Abundances of new member stars in the Tucana II dwarf galaxy Chiti, Anirudh; Frebel, Anna; Ji, Alexander P. arXiv https://doi.org/10.48550/arxiv.1803.01808	text	January 2018
Estimating the Mass of the Milky Way Using the Ensemble of Classical Satellite Galaxies Patel, Ekta; Besla, Gurtina; Mandel, Kaisey arXiv https://doi.org/10.48550/arxiv.1803.01878	text	January 2018
Snake in the Clouds: A new nearby dwarf galaxy in the Magellanic bridge Koposov, Sergey E.; Walker, Matthew G.; Belokurov, Vasily arXiv https://doi.org/10.48550/arxiv.1804.06430	text	January 2018
The Missing Satellites of the Magellanic Clouds? Gaia Proper Motions of the Recently Discovered Ultra-Faint Galaxies Kallivayalil, Nitya; Sales, Laura; Zivick, Paul arXiv https://doi.org/10.48550/arxiv.1805.01448	text	January 2018
The Galactic disk mass-budget : I. stellar mass-function and density Chabrier, G. arXiv https://doi.org/10.48550/arxiv.astro-ph/0107018	text	January 2001
Proper Motions of Dwarf Spheroidal Galaxies from Hubble Space Telescope Imaging. I: Method and a Preliminary Measurement for Fornax Piatek, S.; Pryor, C.; Olszewski, E. W. arXiv https://doi.org/10.48550/arxiv.astro-ph/0209430	text	January 2002
Correcting for the Effects of Interstellar Extinction Fitzpatrick, Edward L. arXiv https://doi.org/10.48550/arxiv.astro-ph/9809387	text	January 1998

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Phat ELVIS: The inevitable effect of the Milky Way’s disc on its dark matter subhaloes Kelley, Tyler; Bullock, James S.; Garrison-Kimmel, Shea Monthly Notices of the Royal Astronomical Society, Vol. 487, Issue 3 https://doi.org/10.1093/mnras/stz1553	journal	June 2019
The southern stellar stream spectroscopic survey (S5): Overview, target selection, data reduction, validation, and early science Li, T. S.; Koposov, S. E.; Zucker, D. B. Monthly Notices of the Royal Astronomical Society, Vol. 490, Issue 3 https://doi.org/10.1093/mnras/stz2731	journal	October 2019
The Milky Way’s disc of classical satellite galaxies in light of Gaia DR2 Pawlowski, Marcel S.; Kroupa, Pavel Monthly Notices of the Royal Astronomical Society, Vol. 491, Issue 2 https://doi.org/10.1093/mnras/stz3163	journal	November 2019
An Updated Small Magellanic Cloud and Magellanic Bridge Catalog of Star Clusters, Associations, and Related Objects Bica, Eduardo; Westera, Pieter; Kerber, Leandro de O. The Astronomical Journal, Vol. 159, Issue 3 https://doi.org/10.3847/1538-3881/ab6595	journal	February 2020
Chemical Abundance Analysis of Tucana III, the Second r -process Enhanced Ultra-faint Dwarf Galaxy Marshall, J. L.; Hansen, T.; Simon, J. D. The Astrophysical Journal, Vol. 882, Issue 2 https://doi.org/10.3847/1538-4357/ab3653	journal	September 2019
Dynamical Histories of the Crater II and Hercules Dwarf Galaxies Fu, Sal Wanying; Simon, Joshua D.; Jara, Alex G. Alarcón The Astrophysical Journal, Vol. 883, Issue 1 https://doi.org/10.3847/1538-4357/ab3658	journal	September 2019
Proper Motions of Stellar Streams Discovered in the Dark Energy Survey Shipp, N.; Li, T. S.; Pace, A. B. The Astrophysical Journal, Vol. 885, Issue 1 https://doi.org/10.3847/1538-4357/ab44bf	journal	October 2019
A Versatile and Accurate Method for Halo Mass Determination from Phase-space Distribution of Satellite Galaxies Li, Zhao-Zhou; Qian, Yong-Zhong; Han, Jiaxin The Astrophysical Journal, Vol. 886, Issue 1 https://doi.org/10.3847/1538-4357/ab4f6d	journal	November 2019
Detailed Abundances in the Ultra-faint Magellanic Satellites Carina II and III Ji, A. P.; Li, T. S.; Simon, J. D. The Astrophysical Journal, Vol. 889, Issue 1 https://doi.org/10.3847/1538-4357/ab6213	journal	January 2020
Dynamical Histories of the Crater II and Hercules Dwarf Galaxies Fu, Sal Wanying; Simon, Joshua D.; Jara, Alex G. Alarcón arXiv https://doi.org/10.48550/arxiv.1901.00594	text	January 2019
The Milky Way's Disk of Classical Satellite Galaxies in Light of Gaia DR2 Pawlowski, Marcel S.; Kroupa, Pavel arXiv https://doi.org/10.48550/arxiv.1911.05081	text	January 2019

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