Discovery of Andromeda XIV: A Dwarf Spheroidal Dynamical Rogue in the Local Group? | Zendy

Steven R. Majewski | Zendy; Rachael L. Beaton | Zendy; Richard J. Patterson | Zendy; J. Kalirai | Zendy; Marla Geha | Zendy; Ricardo R. Muñoz | Zendy; Marc S. Seigar | Zendy; Puragra Guhathakurta | Zendy; Karoline M. Gilbert | Zendy; R. Michael Rich | Zendy; James S. Bullock | Zendy; David B. Reitzel | Zendy

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Discovery of Andromeda XIV: A Dwarf Spheroidal Dynamical Rogue in the Local Group?

Author(s) -

Steven R. Majewski,

Rachael L. Beaton,

Richard J. Patterson,

J. Kalirai,

Marla Geha,

Ricardo R. Muñoz,

Marc S. Seigar,

Puragra Guhathakurta,

Karoline M. Gilbert,

R. Michael Rich,

James S. Bullock,

David B. Reitzel

Publication year - 2007

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/524033

Subject(s) - local group , andromeda , physics , dwarf spheroidal galaxy , astrophysics , andromeda galaxy , dwarf galaxy , galaxy , radius , astronomy , satellite galaxy , halo , milky way , interacting galaxy , computer security , computer science

In the course of our survey of the outer halo of the Andromeda Galaxy we havediscovered a remote, possible satellite of that system at a projected 162 kpc(11.7 degrees) radius. The fairly elongated (0.31 +/- 0.09 ellipticity) dwarfcan be fit with a King profile of 1.07 kpc (d/784 kpc) limiting radius, wherethe satellite distance, d, is estimated at ~630-850 kpc from the tip of the redgiant branch. The newfound galaxy, ``Andromeda XIV'' (``AndXIV''),distinguishes itself from other Local Group galaxies by its extreme dynamics:Keck/DEIMOS spectroscopy reveals it to have a large heliocentric radialvelocity (-481 km/s), or -206 km/s velocity relative to M31. Even at itsprojected radius AndXIV already is at the M31 escape velocity based on thelatest M31 mass models. If AndXIV is bound to M31, then recent models withreduced M31 virial masses need revision upward. If not bound to M31, thenAndXIV is just now falling into the Local Group for the first time andrepresents a dwarf galaxy that formed and spent almost its entire life inisolation.Comment: 5 pages, 5 figures, accepted for publication in ApJ Letter

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