2004A&A...421L..29M


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.30CEST10:32:20

2004A&A...421L..29M - Astronomy and Astrophysics, volume 421, L29-32 (2004/7-2)

Probing the Canis Major stellar over-density as due to the Galactic warp.

MOMANY Y., ZAGGIA S.R., BONIFACIO P., PIOTTO G., DE ANGELI F., BEDIN L.R. and CARRARO G.

Abstract (from CDS):

Proper-motion, star counts and photometric catalog simulations are used to explain the detected stellar over-density in the region of Canis Major, claimed to be the core of a disrupted dwarf galaxy (CMa, Martin et al., 2004MNRAS.348...12M; Bellazzini et al., 2004, MNRAS, submitted, astro-ph/0311119), as due to the Galactic warp and flare in the external disk. We compare the kinematics of CMa M-giant selected sample with surrounding Galactic disk stars in the UCAC2 catalog and find no peculiar proper motion signature: CMa stars mimic thick disk kinematics. Moreover, when taking into account the Galactic warp and flare of the disk, 2MASS star count profiles reproduce the CMa stellar over-density. This star count analysis is confirmed by direct comparison with synthetic color-magnitude diagrams simulated with the Besancon models (Robin et al., 2003A&A...409..523R) that include the warp and flare of the disk. The presented evidence casts doubt on the identification of the CMa over-density as the core of a disrupted Milky Way satellite. This however does not make clear the origin of over-densities responsible for the ring structure in the anticenter direction of the Galactic halo (Newberg et al., 2002ApJ...569..245N; Yanny et al., 2003ApJ...588..824Y).

Abstract Copyright:

Journal keyword(s): astrometry - Galaxy: structure - Galaxy: formation - Galaxies: interactions

Status at CDS:  

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 C 0658-204 OpC 07 00 29 -20 34.0           ~ 42 0
2 NAME CMa Dwarf Galaxy G 07 12.6 -27 40     -0.1     ~ 186 1
3 NGC 2477 OpC 07 52 10 -38 31.8   6.64 5.8     ~ 256 0

    Equat.    Gal    SGal    Ecl

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2020.03.30-10:32:20

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