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Stacking the Invisibles: A Guided Search for Low-Luminosity Milky Way Satellites
B. Sesar, S. R. Banholzer, J. G. Cohen +9
Almost every known low-luminosity Milky Way dwarf spheroidal (dSph) satellite galaxy contains at least one RR Lyrae star. Assuming that a fraction of distant (60 < d_{helio} < 100…
Tracing the Orphan Stream to 55 kpc with RR Lyrae Stars
Branimir Sesar, Carl J. Grillmair, Judith G. Cohen +10
We report positions, velocities and metallicities of 50 ab-type RR Lyrae (RRab) stars observed in the vicinity of the Orphan stellar stream. Using about 30 RRab stars classified as…
Two Distant Halo Velocity Groups Discovered by the Palomar Transient Factory
B. Sesar, J. G. Cohen, D. Levitan +8
We report the discovery of two new halo velocity groups (Cancer groups A and B) traced by 8 distant RR Lyrae stars and observed by the Palomar Transient Factory (PTF) survey at R.A…