J/MNRAS/453/690 Fornax VST ATLAS catalogue (Bate+, 2015)
The shell game: a panoramic view of Fornax.
Bate N.F., McMonigal B., Lewis G.F., Irwin M.J., Gonzalez-Solares E.,
Shanks T., Metcalfe N.
<Mon. Not. R. Astron. Soc., 453, 690-703 (2015)>
=2015MNRAS.453..690B 2015MNRAS.453..690B (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Photometry, SDSS
Keywords: galaxies: dwarf - galaxies: individual: Fornax dSph - Local Group -
galaxies: stellar content
Abstract:
We present a panoramic study of the Fornax dwarf spheroidal galaxy,
using data obtained as part of the VLT Survey Telescope (VST) ATLAS
Survey. The data presented here - a subset of the full survey -
uniformly cover a region of 25deg2 centred on the galaxy, in g, r and
i bands. This large area coverage reveals two key differences to
previous studies of Fornax. First, data extending beyond the nominal
tidal radius of the dwarf highlight the presence of a second distinct
red giant branch population. This bluer red giant branch appears to be
co-eval with the horizontal branch population. Secondly, a shell
structure located approximately 1.4° from the centre of Fornax is
shown to be a mis-identified background overdensity of galaxies. This
last result casts further doubt on the hypothesis that Fornax
underwent a gas-rich merger in its relatively recent past.
Description:
The data presented in this paper were obtained as part of the ATLAS
survey, one of three ESO public surveys currently being carried out
using the 2.6-m VST. Details of the VST ATLAS survey and Data Release
1 (DR1) can be found in Shanks et al. (2013, The Messenger, 154, 38
and 2015MNRAS.451.4238S 2015MNRAS.451.4238S) and Koposov et al. (2014MNRAS.442L..85K 2014MNRAS.442L..85K). The
survey aims to cover an area of several thousand square degrees in the
southern celestial hemisphere, in ugriz filters to depths comparable
to the Sloan Digital Sky Survey (SDSS) in the north. The median seeing
in DR1 is <1-arcsec, and the median limiting magnitudes in each band
corresponding to 5σ detection limits are approximately 21.0,
23.1, 22.4, 21.4, 20.2.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 82 412441 Fornax VST ATLAS catalogue
--------------------------------------------------------------------------------
See also:
J/MNRAS/441/2555 : ATLAS 1.4GHz Data Release 2 (Hales+, 2014)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 I6 --- Seq Sequential number
8- 9 I2 h RAh Right ascension (ICRS)
11- 12 I2 min RAm Right ascension (ICRS)
14- 20 F7.4 s RAs Right ascension (ICRS)
22 A1 --- DE- Declination sign (ICRS)
23- 24 I2 deg DEd Declination (ICRS)
26- 27 I2 arcmin DEm Declination (ICRS)
29- 34 F6.3 arcsec DEs Declination (ICRS)
36- 41 F6.3 mag gmag ?=0 g magnitude (Vega)
43- 47 F5.3 mag e_gmag ?=0 rms uncertainty on gmag
49- 50 I2 --- gclass Classification from g band (1)
52- 57 F6.3 mag rmag ?=0 r magnitude (Vega)
59- 63 F5.3 mag e_rmag ?=0 rms uncertainty on rmag
65- 66 I2 --- rclass Classification from r band (1)
68- 73 F6.3 mag imag ?=0 i magnitude (Vega)
75- 79 F5.3 mag e_imag ?=0 rms uncertainty on imag
81- 82 I2 --- iclass Classification from i band (1)
--------------------------------------------------------------------------------
Note (1): CASU pipeline classifications as follows:
1 = galaxy
0 = noise-like
-1 = reliable star
-2 = reliable star
-3 = star/compact galaxy
-6 = low average confidence value
-7 = contains bad pixels
-8 = > 1" matching error
-9 = saturated
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 16-Feb-2016