The Fornax Deep Survey with the VST. IX. (Cantiello+, 2020)
Description:
We derive ugri photometry of ~1.7 million sources over the ~21 square degree area of the Fornax Deep Survey (FDS) centered on the bright
galaxy NGC1399. For a wider area, of ~27 square degrees extending in the direction of NGC1316, we provide gri photometry for
~3.1 million sources.
 
The limiting magnitudes are:
u-band ~24.1 ABmag
g-band ~25.4 ABmag
r-band ~24.9 ABmag
i-band ~24.1 ABmag
 
Further details are provided in the paper presenting the catalogs.
 
For any question or comments, please write to:
fdscat.oaab@inaf.it or to michele.cantiello@inaf.it

The Fornax Deep Survey with the VST. IX. The catalog of sources in the FDS area, with an example study for globular clusters and background galaxies.
Michele Cantiello, A. Venhola, A. Grado, M. Paolillo, R. D'Abrusco, G. Raimondo, M. Quintini, M. Hilker, S. Mieske, C. Tortora, M. Spavone, M. Capaccioli, E.
Iodice, R. Peletier, J.F. Barroso, L. Limatola, N. Napolitano, P. Schipani, G. van de Ven, et al.
Astronomy & Astrophysics, 2020

ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Clusters, globular
Keywords: galaxies: elliptical and lenticular, cD -
galaxies: star clusters: general -
galaxies: individual: NGC 1316, NGC 1399 -
galaxies: clusters: individual: Fornax - galaxies: evolution -
galaxies: stellar content

Abstract:
Context. A possible pathway for understanding the events and the mechanisms involved in galaxy formation and evolution is an in-depth comprehension of the
galactic and inter-galactic fossil sub-structures with long dynamical times-scales: stars in the field and in stellar clusters.
Aims. This paper continues the series of the Fornax Deep Survey (FDS). Following the previous studies dedicated to extended Fornax cluster members, in this
paper we present the catalogs of compact stellar systems in the Fornax cluster as well as extended background sources and point-like sources.
Methods. We derive ugri photometry of ~1.7 million sources over the ~21 square degree area of FDS centered on the bright central galaxy NGC1399. For a wider
area, of ~27 square degrees extending in the direction of NGC1316, we provide gri photometry for ~3.1 million sources. To improve the morphological
characterization of sources we generate multi-band image stacks by coadding the best seeing gri-band single exposures with a cut at FWHM<=0.9''. We use the
multi-band stacks as master detection frames, with a FWHM improved by ~15% and a FWHM variability from field to field reduced by a factor of ~2.5 compared to
the pass-band with best FWHM, namely the r-band. The identification of compact sources, in particular of globular clusters (GC), is obtained from a
combination of photometric (e.g. colors, magnitudes) and morphometric (e.g. concentration index, elongation, effective radius) selection criteria, by also
taking as reference the properties of sources with well-defined classification from spectroscopic or high-resolution imaging data.
Results. Using the FDS catalogs, we present a preliminary analysis of globular cluster (GC) distributions in the Fornax area. The study confirms and extends
further previous results which were limited to a smaller survey area. We observe the inter-galactic population of GCs, a population of mainly blue GCs
centered on NGC1399, extends over ~0.9 Mpc, with an ellipticity ~0.65 and a small tilt in the direction of NGC1336. Several sub-structures extend over ~0.5
Mpc along various directions. Two of these structures do not cross any bright galaxy; one of them appears to be connected to NGC1404, a bright galaxy close to
the cluster core and particularly poor of GCs. Using the gri catalogs we analyze the GC distribution over the extended FDS area, and do not find any obvious
GC sub-structure bridging the two brightest cluster galaxies, NGC1316 and NGC1399. Although NGC1316 is more than twice brighter of NGC1399 in optical bands,
using gri data, we estimate a factor of ~3-4 richer GC population around NGC1399 compared to NGC1316, out to galactocentric distances of ~40' or ~230 kpc.

Description of the output

 Label 
 Units 
 Explanations 
 ID 
''
 Source identification based on the IAU naming rules 
 RA 
 deg 
 Right ascension (J2000.0) 
 Dec 
 deg 
 Declination (J2000.0) 
 mu 
 mag 
 u-band PSF corrected magnitude 
 emu 
 mag 
 error on u-band PSF corrected magnitude 
 mg 
 mag 
 g-band PSF corrected magnitude 
 emg 
 mag 
 error on g-band PSF corrected magnitude 
 mr 
 mag 
 r-band PSF corrected magnitude 
 emr 
 mag 
 error on r-band PSF corrected magnitude 
 mi 
 mag 
 i-band PSF corrected magnitude 
 emi 
 mag 
 error on i-band PSF corrected magnitude 
 Class_Star 
 '' 
 SExtractor CLASS_STAR from the multi-band 'a'-stacks 
 Conc_indx 
 '' 
 Normalized concentration index from 'a'-stacks 
 Flux_Rad 
 arcsec 
 SExtractor Flux radius from the multi-band 'a'-stacks 
 FWHM 
 arcsec 
 Source FWHM from the multi-band 'a'-stacks 
 Major_axis 
 deg 
 SExtractor Profile RMS along major axis from 'a'-stacks 
 Minor_axis 
 deg 
 SExtractor Profile RMS along minor axis from 'a'-stacks 
 Elongation 
 '' 
 Elongation, major-to-minor axis ratio -from 'a'-stacks 
 Flags 
 '' 
 Flags, based on SExtractor flags coding rules 
 Sharpness 
 '' 
 DAOphot sharpness parameter from the 'a'-stacks 
 Class_star_u 
 '' 
 SExtractor CLASS_STAR - u-band 
 Conc_indx_u 
 '' 
 Normalized concentration index - u-band 
 Sharpness_u 
 '' 
 DAOphot sharpness parameter - u-band 
 mu8pix 
 mag 
 Aperture magnitude within 8 pixels - u-band 
 emu8pix 
 mag 
 Error on Aperture magnitude within 8 pixels - u-band 
 muauto 
 mag 
 Sextr. automated aperture magnitude MAG_AUTO - u band 
 emuauto 
 mag 
 Error on automated aperture magnitude MAG_AUTO - u band 
 Class_star_g 
 '' 
 SExtractor CLASS_STAR - g-band 
 Conc_indx_g 
 '' 
 Normalized concentration index - g-band 
 Sharpness_g 
 '' 
 DAOphot sharpness parameter - g-band 
 mg8pix 
 mag 
 Aperture magnitude within 8 pixels - g-band 
 emg8pix 
 mag 
 Error on Aperture magnitude within 8 pixels - g-band 
 mgauto 
 mag 
 Sextr. automated aperture magnitude MAG_AUTO - g band 
 emgauto 
 mag 
 Error on automated aperture magnitude MAG_AUTO - g band 
 Class_star_r 
 '' 
 SExtractor CLASS_STAR - r-band 
 Conc_indx_r 
 '' 
 Normalized concentration index - r-band 
 Sharpness_r 
 '' 
 DAOphot sharpness parameter - r-band 
 mr8pix 
 mag 
 Aperture magnitude within 8 pixels - r-band 
 emr8pix 
 mag 
 Error on Aperture magnitude within 8 pixels - r-band 
 mrauto 
 mag 
 Sextr. automated aperture magnitude MAG_AUTO - r band 
 emrauto 
 mag 
 Error on automated aperture magnitude MAG_AUTO - r band 
 Class_star_i 
 '' 
 SExtractor CLASS_STAR - i-band 
 Conc_indx_i 
 '' 
 Normalized concentration index - i-band 
 Sharpness_i 
 '' 
 DAOphot sharpness parameter - i-band 
 mi8pix 
 mag 
 Aperture magnitude within 8 pixels - i-band 
 emi8pix 
 mag 
 Error on Aperture magnitude within 8 pixels - i-band 
 miauto 
 mag 
 Sextr. automated aperture magnitude MAG_AUTO - i band 
 emiauto 
 mag 
 Error on automated aperture magnitude MAG_AUTO - i band 
 E(B-V) 
 mag 
 Reddening from Schlafly & Finkbeiner (2011) 
 FDSfield 
 '' 
 FDS field pointing ID 

© 2021 INAF-OAAb - Catalog Version: 2.2 - Web Version: 7.7.20