Hydra II: a faint and compact milky way dwarf galaxy found in the survey of the magellanic stellar history
dc.contributor.author | Martin, Nicolas F. | |
dc.contributor.author | Nidever, David L. | |
dc.contributor.author | Besla, Gurtina | |
dc.contributor.author | Olsen, Knut | |
dc.contributor.author | Walker, Alistair R. | |
dc.contributor.author | Vivas, A. Katherina | |
dc.contributor.author | Gruendl, Robert A. | |
dc.contributor.author | Kaleida, Catherine C. | |
dc.contributor.author | Muñoz, Ricardo R. | |
dc.contributor.author | Blum, Robert D. | |
dc.contributor.author | Saha, Abhijit | |
dc.contributor.author | Conn, Blair C. | |
dc.contributor.author | Bell, Eric F. | |
dc.contributor.author | Chu, You Hua | |
dc.contributor.author | Cioni, M-R.L. | |
dc.contributor.author | De Boer, Thomas J. L. | |
dc.contributor.author | Gallart, Carme | |
dc.contributor.author | Jin, Shoko | |
dc.contributor.author | Kunder, Andrea | |
dc.contributor.author | Majewski, Steven R. | |
dc.contributor.author | Martinez-Delgado, David | |
dc.contributor.author | Monachesi, Antonela | |
dc.contributor.author | Monelli, Matteo | |
dc.contributor.author | Monteagudo, Lara | |
dc.contributor.author | Noël, Noelia E.D. | |
dc.contributor.author | Olszewski, Edward W. | |
dc.contributor.author | Stringfellow, Guy S. | |
dc.contributor.author | Van Der Marel, Roeland P. | |
dc.contributor.author | Zaritsky, Dennis | |
dc.date.accessioned | 2015-06-01T13:36:01Z | |
dc.date.available | 2015-06-01T13:36:01Z | |
dc.date.issued | 2015-05-01 | |
dc.identifier.citation | Martin , N F , Nidever , D L , Besla , G , Olsen , K , Walker , A R , Vivas , A K , Gruendl , R A , Kaleida , C C , Muñoz , R R , Blum , R D , Saha , A , Conn , B C , Bell , E F , Chu , Y H , Cioni , M-RL , De Boer , T J L , Gallart , C , Jin , S , Kunder , A , Majewski , S R , Martinez-Delgado , D , Monachesi , A , Monelli , M , Monteagudo , L , Noël , N E D , Olszewski , E W , Stringfellow , G S , Van Der Marel , R P & Zaritsky , D 2015 , ' Hydra II: a faint and compact milky way dwarf galaxy found in the survey of the magellanic stellar history ' , Astrophysical Journal Letters , vol. 804 , no. 1 , L5 . https://doi.org/10.1088/2041-8205/804/1/L5 | |
dc.identifier.issn | 2041-8205 | |
dc.identifier.uri | http://hdl.handle.net/2299/15966 | |
dc.description | Date of Acceptance: 31/03/2015 | |
dc.description.abstract | 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 (M_V = -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. | en |
dc.format.extent | 714477 | |
dc.language.iso | eng | |
dc.relation.ispartof | Astrophysical Journal Letters | |
dc.subject | galaxies: individual (Hydra II) | |
dc.subject | Local Group | |
dc.subject | Magellanic Clouds | |
dc.title | Hydra II: a faint and compact milky way dwarf galaxy found in the survey of the magellanic stellar history | en |
dc.contributor.institution | School of Physics, Astronomy and Mathematics | |
dc.contributor.institution | Science & Technology Research Institute | |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.1088/2041-8205/804/1/L5 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true |