2015A&A...579A..38P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST15:34:44

2015A&A...579A..38P - Astronomy and Astrophysics, volume 579A, 38-38 (2015/7-1)

A skewer survey of the Galactic halo from deep CFHT and INT images.

PILA-DIEZ B., DE JONG J.T.A., KUIJKEN K., VAN DER BURG R.F.J. and HOEKSTRA H.

Abstract (from CDS):

We study the density profile and shape of the Galactic halo using deep multicolour images from the MENeaCS and CCCP projects, over 33 fields selected to avoid overlap with the Galactic plane. Using multicolour selection and point spread function homogenization techniques we obtain catalogues of F stars (near-main sequence turnoff stars) out to Galactocentric distances up to 60kpc. Grouping nearby lines of sight, we construct the stellar density profiles through the halo in eight different directions by means of photometric parallaxes. Smooth halo models are then fitted to these profiles. We find clear evidence for a steepening of the density profile power law index around R=20kpc, from -2.50±0.04 to -4.85±0.04, and for a flattening of the halo towards the poles with best-fit axis ratio 0.79±0.02. Furthermore, we cannot rule out a mild triaxiality (w≥0.88±0.07). We recover the signatures of well-known substructure and streams that intersect our lines of sight. These results are consistent with those derived from wider but shallower surveys, and augur well for upcoming, wide-field surveys of comparable depth to our pencil beam surveys.

Abstract Copyright:

Journal keyword(s): Galaxy: structure - Galaxy: halo - Galaxy: stellar content

Simbad objects: 12

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Number of rows : 12

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 NAME Sgr Stream St* 02 22 +00.0           ~ 644 0
2 NAME Gal Anticenter reg 05 46 +28.9           ~ 720 0
3 ACO 1033 ClG 10 31 33.7 +35 04 34           ~ 61 0
4 ACO 1361 ClG 11 43 39.6 +46 21 20           ~ 81 0
5 NGC 5466 GlC 14 05 27.29 +28 32 04.0   10.5 9.70     ~ 719 0
6 ACO 1927 ClG 14 31 06.2 +25 38 15           ~ 92 0
7 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11533 0
8 NAME SDG G 18 55 03.1 -30 28 42   4.5 3.6     ~ 1737 2
9 NAME Pisces Overdensity G 23 19.0 +00 00           ~ 45 0
10 NAME Triangulum-Andromeda Region reg ~ ~           ~ 70 0
11 NAME Monoceros Stream St* ~ ~           ~ 311 0
12 NAME Orphan Stream St* ~ ~           ~ 189 0

    Equat.    Gal    SGal    Ecl

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2020.07.04-15:34:44

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