The Milky Way Tomography with SDSS. I. Stellar Number Density Distribution | Zendy

Mario Jurić | Zendy; Željko Ivezić | Zendy; Alyson Brooks | Zendy; Robert H. Lupton | Zendy; David J. Schlegel | Zendy; Douglas P. Finkbeiner | Zendy; Nikhil Padmanabhan | Zendy; Nicholas A. Bond | Zendy; Branimir Sesar | Zendy; Constance M. Rockosi | Zendy; G. R. Knapp | Zendy; James E. Gunn | Zendy; T. Sumi | Zendy; Donald P. Schneider | Zendy; John C. Barentine | Zendy; H. Brewington | Zendy; J. Brinkmann | Zendy; M. Fukugita | Zendy; Michael Harvanek | Zendy; S. J. Kleinman | Zendy; J. Krzesiński | Zendy; Dan Long | Zendy; Eric H. Neilsen | Zendy; A. Nitta | Zendy; Stephanie A. Snedden | Zendy; Donald G. York | Zendy

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The Milky Way Tomography with SDSS. I. Stellar Number Density Distribution

Author(s) -

Mario Jurić,

Željko Ivezić,

Alyson Brooks,

Robert H. Lupton,

David J. Schlegel,

Douglas P. Finkbeiner,

Nikhil Padmanabhan,

Nicholas A. Bond,

Branimir Sesar,

Constance M. Rockosi,

G. R. Knapp,

James E. Gunn,

T. Sumi,

Donald P. Schneider,

John C. Barentine,

H. Brewington,

J. Brinkmann,

M. Fukugita,

Michael Harvanek,

S. J. Kleinman,

J. Krzesiński,

Dan Long,

Eric H. Neilsen,

A. Nitta,

Stephanie A. Snedden,

Donald G. York

Publication year - 2008

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 - 10.1086/523619

Subject(s) - physics , astrophysics , milky way , halo , sky , galaxy , thick disk , star count , dwarf galaxy , surface brightness , stars , astronomy , k type main sequence star , t tauri star

Abridged: We estimate the distances to ~48 million stars detected by theSloan Digital Sky Survey and map their 3D number density distribution in 100 1000deg^2 of sky towards the constellation of Virgo, at distances of~6-20 kpc. Compared to a region symmetric with respect to the l=0 line, theVirgo overdensity is responsible for a factor of 2 number density excess andmay be a nearby tidal stream or a low-surface brightness dwarf galaxy mergingwith the Milky Way. After removal of the resolved overdensities, the remainingdata are consistent with a smooth density distribution; we detect no evidenceof further unresolved clumpy substructure at scales ranging from ~50pc in thedisk, to ~1 - 2 kpc in the halo.Comment: 60 pages, 46 figures (reduced resolution; see the ApJ for hi-res version

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