Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-05-10
Astrophys.J.662:L83-L86,2007
Astronomy and Astrophysics
Astrophysics
Accept by ApJL May 9, 2007
Scientific paper
10.1086/519684
As part of preparations for a southern sky search for faint Milky Way dwarf galaxy satellites, we report the discovery of a stellar overdensity in the Sloan Digital Sky Survey Data Release 5, lying at an angular distance of only 1.5 degrees from the recently discovered Bo{\"o}tes dwarf. The overdensity was detected well above statistical noise by employing a sophisticated data mining algorithm and does not correspond to any catalogued object. Overlaid isochrones using stellar population synthesis models show that the color-magnitude diagram of that region has the signature of an old (12 Gyr), metal-poor (${\rm Fe/H}\approx-2.0$) stellar population at a tentative distance of 60 kpc, evidently the same heliocentric distance as the Bo\"otes dwarf. We estimate the new object to have a total magnitude of $M_{V}\sim-3.1\pm1.1$ mag and a half-light radius of $r_{h}=4'.1\pm1'.6$ ($72\pm28$ pc) placing it in an apparent $40
Jerjen Helmut
Walsh S. M.
Willman Beth
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