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

  title={Probing the Canis Major stellar over-density as due to the Galactic warp},
  author={Yazan Momany and Simone Zaggia and Piercarlo Bonifacio and Giampaolo Piotto and Francesca de Angeli and Luigi R. Bedin and G Astr and Universit̀a di Padova and Inaf - Oss. Astr. Trieste},
  journal={Astronomy and Astrophysics},
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. [CITE], MNRAS, 348, 12; Bellazzini et al. [CITE], [arXiv: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… 

Figures from this paper

Why the Canis Major overdensity is not due to the Warp: analysis of its radial profile and velocities
In response to criticism by Momany et al. (2004), that the recently-identified Canis Major (CMa) overdensity could be simply explained by the Galactic warp, we present proof of the existence of a
The core of the Canis Major galaxy as traced by red clump stars
The recently discovered stellar system in Canis Major is analysed using He-burning red clump stars as tracers. Canis Major turns out to be the strongest and the most spatially confined overdensity of
Re-affirming the connection between the Galactic stellar warp and the Canis Major over-density
Aims. We aim to understand the real nature of the stellar overdensity at southern galactic latitudes in the region of CMa. Methods. We perform a critical re-analysis and discussion of recent results
The Milky Way's external disc constrained by 2MASS star counts
Context. Thanks to recent large-scale surveys in the near infrared, such as 2MASS, the galactic plane that most suffers from extinction is revealed so its overall structure can be studied. Aims. This
Our multi-epoch survey of ~20 deg2 of the Canis Major (CMa) overdensity has detected only 10 RR Lyrae stars (RRLS). We show that this number is consistent with the number expected from the Galactic
UVES observations of the Canis Major overdensity
We present the first detailed chemical abundances for three giant stars which are candidate members of the Canis Major overdensity, obtained by using FLAMES-UVES at VLT. The stars, in the background
Outer structure of the Galactic warp and flare: explaining the Canis Major over-density
Aims. In this paper we derive the structure of the Galactic stellar warp and flare. Methods. We use 2MASS red clump and red giant stars, selected at mean and fixed heliocentric distances of
Absolute Proper Motion of the Canis Major Dwarf Galaxy Candidate
We have measured the absolute proper motion of the candidate Canis Major dwarf galaxy (CMa), at (l, b) =(240°, -8°). Likely main-sequence stars in CMa have been selected from a region in the
Modelling star counts in the Monoceros stream and the Galactic anti-centre
Context. There is a continuing debate as to the form of the outer disc of the Milky Way galaxy, which has important implications for understanding the Galaxy’s formation. Stars are known to exist at
Modeling the Stellar Populations in the Canis Major Overdensity: The Relation between the Old and Young Populations
We analyze the stellar populations of the Canis Major stellar overdensity using quantitative color-magnitude diagram (CMD) fitting techniques. The analysis is based on photometry obtained with the


A dwarf galaxy remnant in Canis Major: the fossil of an in-plane accretion on to the Milky Way
An analysis of the asymmetries in the population of Galactic M-giant stars present in the 2MASS All Sky catalogue suggests that the Canis Major dwarf galaxy is a building block of the Galactic thick disk, that the thick disk is continually growing, even up to the present time, and that thick disk globular clusters were accreted onto the Milky Way from dwarf galaxies in co-planar orbits.
Exploring Halo Substructure with Giant Stars: Spectroscopy of Stars in the Galactic Anticenter Stellar Structure
To determine the nature of the recently discovered, ringlike stellar structure at the Galactic anticenter, we have collected spectra of a set of presumed constituent M giants selected from the Two
Tracing the Galactic Anticenter Stellar Stream with 2MASS M Giants
The recently discovered, ringlike structure just outside the Galactic disk in Monoceros is detected and traced among 2MASS M giant stars. We have developed a method to recover the signature of this
Old stellar Galactic disc in near-plane regions according to 2MASS: Scales, cut-off, flare and warp
We have pursued two dierent methods to analyze the old stellar population near the Galactic plane, using data from the 2MASS survey. The first method is based on the isolation of the red clump giant
The warp of the Galactic stellar disk detected in IRAS source counts
About 90,000 IRAS point sources have been used as disk tracers in order to explore the possibility of warp in the Galactic stellar disk. The results imply that the Galactic stellar disk is warped at
A synthetic view on structure and evolution of the Milky Way
Since the Hipparcos mission and recent large scale surveys in the optical and the near-infrared, new constraints have been obtained on the structure and evolution history of the Milky Way. The
Dirbe evidence for a wrap in the interstellar dust layer and stellar disk of the galaxy
The Diffuse Infrared Background Experiment (DIRBE) of the Cosmic Background Explorer (COBE) has mapped the surface brightness distributions of the Galactic plane at wavelengths from 1.25 to 240
The Kinematics, Orbit, and Survival of the Sagittarius Dwarf Spheroidal Galaxy
The Sagittarius galaxy (Sgr), the closest satellite galaxy of the Milky Way, has survived for many orbits about the Galaxy. Extant numerical calculations modeled this galaxy as a system with a
Space Velocities of Globular Clusters. III. Cluster Orbits and Halo Substructure
We have compiled a catalog of absolute proper motions of globular clusters from various sources. The sample consists of 38 clusters, from which most of the southern ones (15 clusters) were measured
The Ghost of Sagittarius and Lumps in the Halo of the Milky Way
We identify new structures in the halo of the Milky Way from positions, colors, and magnitudes of five million stars detected in the Sloan Digital Sky Survey. Most of these stars are within 126 of