Journal
ASTROPHYSICAL JOURNAL
Volume 686, Issue 1, Pages 279-291Publisher
IOP PUBLISHING LTD
DOI: 10.1086/589911
Keywords
galaxy : formation; galaxy : halo; galaxy : structure; local group
Categories
Funding
- DFG [SFB 439]
- EARA-EST Marie Curie Visiting Fellowship
- Science and Technology Facilities Council (STFC)
- STFC-funded Galaxy Formation and Evolution program
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy
- the National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- Participating Institutions
- STFC [PP/E001068/1] Funding Source: UKRI
- Science and Technology Facilities Council [PP/E001068/1, PP/E00105X/1, ST/F001967/1, PP/C002229/1] Funding Source: researchfish
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We quantify the detectability of stellar MilkyWay satellites in the Sloan Digital Sky Survey (SDSS) Data Release 5. We show that the effective search volumes for the recently discovered SDSS satellites depend strongly on their luminosity, with their maximum distance, D-max, substantially smaller than the Milky Way halo's virial radius. Calculating the maximum accessible volume, V-max, for all faint detected satellites allows the calculation of the luminosity function for Milky Way satellite galaxies, accounting quantitatively for their detectability. We find that the number density of satellite galaxies continues to rise toward low luminosities, but may flatten at M-V similar to -5; within the uncertainties, the luminosity function can be described by a single power law dN/dM(V) = 10 x 10(0.1( MV+5)), spanning luminosities from M-V = 2 all the way to the luminosity of the Large Magellanic Cloud. In comparing these results to several semianalytic galaxy formation models, we find that their predictions differ significantly from the data: either the shape of the luminosity function or the model's surface brightness distribution does not match.
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