J/A+A/623/A1 Fornax Deep Survey with VST. V. Isophote fit (Iodice+, 2019)
The Fornax Deep Survey with VST.
V. Exploring the faintest regions of the bright early-type galaxies inside the
virial radius.
Iodice E., Spavone M., Capaccioli M., Peletier R.F., van de Ven G.,
Napolitano N.R., Hilker M., Mieske S., Smith R., Pasquali A., Limatola L.,
Grado A., Venhola A., Cantiello M., Paolillo M., Falcon-Barroso J.,
D'Abrusco R., Schipan P.
<Astron. Astrophys. 623, A1 (2019)>
=2019A&A...623A...1I 2019A&A...623A...1I (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ; Photometry, SDSS
Keywords: survey - galaxies: photometry -
galaxies: elliptical and lenticular, cD -
galaxies: clusters: individual: Fornax
Abstract:
This paper is based on the multi-band (ugri) Fornax Deep Survey (FDS)
with the VLT Survey Telescope (VST). We study bright early-type
galaxies (mB<15mag) in the 9 square degrees around the core of the
Fornax cluster, which covers the virial radius (R_vir∼0.7Mpc).
The main goal of the present work is to provide an analysis of the
light distribution for all galaxies out to unprecedented limits (in
radius and surface brightness) and to release the main products
resulting from this analysis in all FDS bands. We give an initial
comprehensive view of the galaxy structure and evolution as a function
of the cluster environment. From the isophote fit, we derived the
azimuthally averaged surface brightness profiles, the position angle,
and ellipticity profiles as a function of the semi-major axis. In each
band, we derived the total magnitudes, effective radii, integrated
colours, and stellar mass-to-light ratios.
The long integration times, the arcsec-level angular resolution of
OmegaCam@VST, and the large covered area of FDS allow us to map the
light and colour distributions out to large galactocentric distances
(up to about 10-15Re) and surface brightness levels beyond
mur=27mag/arcsec2 (muB>28mag/arcsec2). Therefore, the new FDS
data allow us to explore in great detail the morphology and structure
of cluster galaxies out to the region of the stellar halo.
The analysis presented in this paper allows us to study how the
structure of galaxies and the stellar population content vary with the
distance from the cluster centre. In addition to the intra-cluster
features detected in previous FDS works, we found a new faint filament
between FCC 143 and FCC 147, suggesting an ongoing interaction. The
observations suggest that the Fornax cluster is not completely relaxed
inside the virial radius. The bulk of the gravitational interactions
between galaxies happens in the W-NW core region of the cluster, where
most of the bright early-type galaxies are located and where the
intra-cluster baryons (diffuse light and globular clusters) are found.
We suggest that the W-NW sub-clump of galaxies results from an
infalling group onto the cluster, which has modified the structure of
the galaxy outskirts (making asymmetric stellar halos) and has
produced the intra-cluster baryons (ICL and GCs), concentrated in this
region of the cluster.
Description:
Photometric parameters for the brightest early-type galaxies inside
the virial radius of the Fornax cluster. For each galaxy, from the
isophote fit in the four OmegaCam bands (ugri) are derived the
azimuthally-averaged surface brightness, the ellipticity and position
angle, with the relative errors, as function of the semi-major axis.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 30 19 List of studied clusters
fccsb.dat 106 1602 FCC surface brightness from isophote fit
fccepspa.dat 151 1048 FCC ellipticity and PA profiles from isophote fit
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See also:
J/A+A/608/A142 : Fornax Deep Survey with VST. III. LSB galaxies (Venhola+ 2017)
Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- FCC Fornax cluster number (G1)
8- 9 I2 h RAh Simbad right ascension (J2000)
11- 12 I2 min RAm Simbad right ascension (J2000)
14- 18 F5.2 s RAs Simbad right ascension (J2000)
20 A1 --- DE- Simbad declination sign (J2000)
21- 22 I2 deg DEd Simbad declination (J2000)
24- 25 I2 arcmin DEm Simbad declination (J2000)
27- 30 F4.1 arcsec DEs Simbad declination (J2000)
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Byte-by-byte Description of file: fccsb.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- FCC Fornax cluster number (G1)
8- 16 F9.6 arcmin smau ? Semi-major axis of the fitted ellipse
in the u band, distance from the center
18- 22 F5.2 mag/arcsec+2 muu ? Azimuthally-averaged surface brightness
in u band
24- 31 F8.6 mag/arcsec+2 e_muu ? Error on the azimuthally-averaged
surface brightness in u band
33- 41 F9.6 arcmin smag ? Semi-major axis of the fitted ellipse
in the g band, distance from the center
43- 47 F5.2 mag/arcsec+2 mug ? Azimuthally-averaged surface brightness
in g band
49- 56 F8.6 mag/arcsec+2 e_mug ? Error on the azimuthally-averaged
surface brightness in g band
58- 66 F9.6 arcmin smar ? Semi-major axis of the fitted ellipse
in the r band, distance from the center
68- 72 F5.2 mag/arcsec+2 mur ? Azimuthally-averaged surface brightness
in r band
74- 81 F8.6 mag/arcsec+2 e_mur ? Error on the azimuthally-averaged
surface brightness in r band
83- 91 F9.6 arcmin smai ? Semi-major axis of the fitted ellipse
in the i band, distance from the center
93- 97 F5.2 mag/arcsec+2 mui ? Azimuthally-averaged surface brightness
in i band
99-106 F8.6 mag/arcsec+2 e_mui ? Error on the azimuthally-averaged
surface brightness in i band
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Byte-by-byte Description of file: fccepspa.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- FCC Fornax cluster number (G1)
8- 14 F7.5 arcmin smau ? Semi-major axis of the fitted ellipse in
the u band, distance from the center
16- 21 F6.4 --- epsu ? Ellipticity of the fitted ellipse in the u band
23- 28 F6.4 --- e_epsu ? Error on the ellipticity of the fitted
ellipse in the u band
30- 35 F6.2 deg PAu []? Position angle of the fitted ellipse in
the u band (1)
37- 43 F7.2 deg e_PAu ? Error on the position angle of the fitted
ellipse in the u band
45- 51 F7.5 arcmin smag ? Semi-major axis of the fitted ellipse in
the g band, distance from the center
53- 58 F6.4 --- epsg ? Ellipticity of the fitted ellipse in the g band
60- 65 F6.4 --- e_epsg ? Error on the ellipticity of the fitted
ellipse in the g band
67- 72 F6.2 deg PAg []? Position angle of the fitted ellipse in
the g band (1)
74- 79 F6.2 deg e_PAg ? Error on the position angle of the fitted
ellipse in the g band
81- 87 F7.5 arcmin smar ? Semi-major axis of the fitted ellipse in
the r band, distance from the center
89- 94 F6.4 --- epsr ? Ellipticity of the fitted ellipse in the r band
96-101 F6.4 --- e_epsr ? Error on the ellipticity of the fitted
ellipse in the r band
103-108 F6.2 deg PAr []? Position angle of the fitted ellipse in
the r band (1)
110-115 F6.2 deg e_PAr ? Error on the position angle of the fitted
ellipse in the r band
117-123 F7.5 arcmin smai ? Semi-major axis of the fitted ellipse in
the i band, distance from the center
125-130 F6.4 --- epsi ? Ellipticity of the fitted ellipse in the i band
132-137 F6.4 --- e_epsi ? Error on the ellipticity of the fitted
ellipse in the i band
139-144 F6.2 deg PAi []? position angle of the fitted ellipse in
the i band (1)
146-151 F6.2 deg e_PAi ? Error on the position angle of the fitted
ellipse in the i band
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Note (1): Position angle is measured from North to East.
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Global notes:
Note (G1): The Fornax cluster number is from Ferguson H., 1989AJ.....98..367F 1989AJ.....98..367F.
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Acknowledgements:
Enrica Iodice, enrichetta.iodice(at)inaf.it
References:
Iodice et al., Paper I 2016ApJ...820...42I 2016ApJ...820...42I
Iodice et al., Paper II 2017ApJ...839...21I 2017ApJ...839...21I
Venhola et al., Paper III 2017A&A...608A.142V 2017A&A...608A.142V, Cat. J/A+A/608/A142
Venhola et al., Paper IV 2018A&A...620A.165V 2018A&A...620A.165V
(End) Patricia Vannier [CDS] 24-Jan-2019