Nicolas F. Martin, David L. Nidever, Gurtina Besla, Knut Olsen, Alistair R. Walker, A. Katherina Vivas, Robert A. Gruendl, Catherine C. Kaleida, Ricardo R. Munoz, Robert D. Blum, Abhijit Saha, Blair C. Conn, Eric F. Bell, You-Hua Chu, Maria-Rosa L. Cioni, Thomas J. L. de Boer, Carme Gallart, Shoko Jin, Andrea Kunder, Steven R. Majewski, David Martinez-Delgado, Antonela Monachesi, Matteo Monelli, Lara Monteagudo, Noelia E. D. Noel, Edward W. Olszewski, Guy S. Stringfellow, Roeland P. van der Marel, Dennis Zaritsky
- We present the discovery of a new dwarf galaxy, Hydra II, found serendipitously within the data from the ongoing Survey of the Magellanic Stellar History conducted with the Dark Energy Camera on the Blanco 4 m Telescope. The new satellite is compact (r(h) = 68 +/- 11 pc) and faint (MV = -4.8 +/- 0.3), but well within the realm of dwarf galaxies. The stellar distribution of Hydra II in the color-magnitude diagram is well-described by a metal-poor ([Fe/H] = -2.2) and old (13 Gyr) isochrone and shows a distinct blue horizontal branch, some possible red clump stars, and faint stars that are suggestive of blue stragglers. At a heliocentric distance of 134 +/- 10 kpc, Hydra II is located in a region of the Galactic halo that models have suggested may host material from the leading arm of the Magellanic Stream. A comparison with N-body simulations hints that the new dwarf galaxy could be or could have been a satellite of the Magellanic Clouds.
MetadatenAuthor details: | Nicolas F. Martin, David L. Nidever, Gurtina Besla, Knut Olsen, Alistair R. Walker, A. Katherina Vivas, Robert A. Gruendl, Catherine C. Kaleida, Ricardo R. Munoz, Robert D. Blum, Abhijit Saha, Blair C. Conn, Eric F. Bell, You-Hua Chu, Maria-Rosa L. CioniORCiD, Thomas J. L. de Boer, Carme Gallart, Shoko Jin, Andrea Kunder, Steven R. Majewski, David Martinez-Delgado, Antonela Monachesi, Matteo Monelli, Lara Monteagudo, Noelia E. D. Noel, Edward W. Olszewski, Guy S. Stringfellow, Roeland P. van der Marel, Dennis Zaritsky |
---|
DOI: | https://doi.org/10.1088/2041-8205/804/1/L5 |
---|
ISSN: | 2041-8205 |
---|
ISSN: | 2041-8213 |
---|
Title of parent work (English): | The astrophysical journal : an international review of spectroscopy and astronomical physics ; Part 2, Letters |
---|
Publisher: | IOP Publ. Ltd. |
---|
Place of publishing: | Bristol |
---|
Publication type: | Article |
---|
Language: | English |
---|
Year of first publication: | 2015 |
---|
Publication year: | 2015 |
---|
Release date: | 2017/03/27 |
---|
Tag: | Local Group; Magellanic Clouds; galaxies: individual (Hydra II) |
---|
Volume: | 804 |
---|
Issue: | 1 |
---|
Number of pages: | 6 |
---|
Funding institution: | McLaughlin Fellowship at the University of Michigan; NSF [AST 1008342];
German Academic Exchange Service (DAAD); ERC [308024]; Netherlands
Organization for Scientific Research (NWO) Veni grant [639.041.131];
German Research Foundation (DFB) [Sonderforschungsbereich (SFB) 881];
CONICYT [ACT-1122, BASAL PFB-06]; NASA; DES; DECam; U.S. Department of
Energy; National Science Foundation; Ministry of Education and Science
(Spain); Science and Technology Facilities Council (UK); Higher
Education Funding Council (England); National Center for Supercomputing
Applications, Kavli Institute for Cosmological Physics; Financiadora de
Estudos e Projetos; Fundacao Carlos Chagas Filho de Amparo a Pesquisa;
Conselho Nacional de Desenvolvimento Cientfico e Tecnologico; Ministerio
da Ciencia e Tecnologia (Brazil); German Research Foundation-sponsored
cluster of excellence "Origin and Structure of the Universe"; DES
collaborating institutions |
---|
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
---|
Peer review: | Referiert |
---|