J/MNRAS/446/120 ATLAS3D project. XXIX (Duc+, 2015)
The ATLAS3D project.
XXIX. The new look of early-type galaxies and surrounding fields disclosed by
extremely deep optical images.
Duc P.-A., Cuillandre J.-C., Karabal E., Cappellari M., Alatalo K.,
Blitz L., Bournaud F., Bureau M., Crocker A.F., Davies R.L., Davis T.A.,
De Zeeuw P.T., Emsellem E., Khochfar S., Krajnovic D., Kuntschner H.,
McDermid R.M., Michel-Dansac L., Morganti R., Naab T., Oosterloo T.,
Paudel S., Sarzi M., Scott N., Serra P., Weijmans A.-M., Young L.M.
<Mon. Not. R. Astron. Soc., 446, 120-143 (2015)>
=2015MNRAS.446..120D 2015MNRAS.446..120D (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxy catalogs ; Morphology
Keywords: techniques: photometric - galaxies: elliptical and lenticular, cD -
galaxies: interactions - galaxies: photometry -
galaxies: stellar content
Abstract:
Galactic archaeology based on star counts is instrumental to
reconstruct the past mass assembly of Local Group galaxies. The
development of new observing techniques and data reduction, coupled
with the use of sensitive large field of view cameras, now allows us
to pursue this technique in more distant galaxies exploiting their
diffuse low surface brightness (LSB) light. As part of the ATLAS3D
project, we have obtained with the MegaCam camera at the
Canada-France-Hawaii Telescope extremely deep, multiband images of
nearby early-type galaxies (ETGs). We present here a catalogue of 92
galaxies from the ATLAS3D sample, which are located in low- to
medium-density environments. The observing strategy and data reduction
pipeline, which achieve a gain of several magnitudes in the limiting
surface brightness with respect to classical imaging surveys, are
presented. The size and depth of the survey are compared to other
recent deep imaging projects. The paper highlights the capability of
LSB-optimized surveys at detecting new prominent structures that
change the apparent morphology of galaxies. The intrinsic limitations
of deep imaging observations are also discussed, among those, the
contamination of the stellar haloes of galaxies by extended ghost
reflections, and the cirrus emission from Galactic dust. The detection
and systematic census of fine structures that trace the present and
past mass assembly of ETGs are one of the prime goals of the project.
We provide specific examples of each type of observed structures -
tidal tails, stellar streams and shells - and explain how they were
identified and classified. We give an overview of the initial results.
The detailed statistical analysis will be presented in future papers.
Description:
Observations have been carried out at the CFHT, with the MegaCam
camera, as part of a series of regular multi-semester PI and snapshot
programs in the framework of the ATLAS3D project (10BF11, 11AF06,
11AD89, 11BD93, 12AF04, 12AF99). The galaxies presented in this image
release were observed between 2010 and 2013.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 33 330 Catalog of ETGs with MegaCam observations
table4.dat 80 244 ETG classification based on the deep imaging
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See also:
J/MNRAS/413/813 : ATLAS3D project. I. (Cappellari+, 2011)
J/MNRAS/414/888 : ATLAS3D project. III. (Emsellem+, 2011)
J/MNRAS/414/940 : ATLAS3D project. IV. (Young+, 2011)
J/MNRAS/416/1680 : ATLAS3D project. VII. (Cappellari+, 2011)
J/MNRAS/433/2812 : ATLAS3D project. XXIII. (Krajnovic+, 2013)
J/MNRAS/448/3484 : ATLAS3D Project. XXX (McDermid+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Galaxy Galaxy name
11- 12 A2 --- Band Observed band
14- 15 I2 --- N Number of individual exposures
17- 20 I4 s Time Total integration time
22- 25 F4.2 arcsec IQ Image Quality (FWHM of the PSF)
27- 33 F7.2 --- Back Background level (in ADUs)
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Galaxy Galaxy name
11- 26 A16 --- Class Classification (1)
28- 80 A53 --- Com Individual comments
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Note (1): Table 3: Coding of LSB structures and contaminant
------------------------------------------------------------------------
Code Features/contaminants
------------------------------------------------------------------------
+s stream
+r shells/ripples
+t tail
+d external star-forming disc/ring
+ah asymmetric halo
+ph perturbed halo
+wl weak central dust lanes
+pl prominent dust lanes
-h galaxy embedded in the halo of a nearby star or galaxy
-wc weak Galactic cirrus in the field
-pc prominent Galactic cirrus
? presence of a given feature is uncertain
------------------------------------------------------------------------
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History:
From electronic version of the journal
References:
Cappellari et al., Paper I 2011MNRAS.413..813C 2011MNRAS.413..813C, Cat. J/MNRAS/413/813
Krajnovic et al., Paper II 2011MNRAS.414.2923K 2011MNRAS.414.2923K
Emsellem et al., Paper III 2011MNRAS.414..888E 2011MNRAS.414..888E, Cat. J/MNRAS/414/888
Young et al., Paper IV 2011MNRAS.414..940Y 2011MNRAS.414..940Y, Cat. J/MNRAS/414/940
Davis et al., Paper V 2011MNRAS.414..968D 2011MNRAS.414..968D
Bois et al., Paper VI 2011MNRAS.416.1654B 2011MNRAS.416.1654B
Cappellari et al., Paper VII 2011MNRAS.416.1680C 2011MNRAS.416.1680C, Cat. J/MNRAS/416/1680
Khochfar et al., Paper VIII 2011MNRAS.417..845K 2011MNRAS.417..845K
Duc et al., Paper IX 2011MNRAS.417..863D 2011MNRAS.417..863D
Davis et al., Paper X 2011MNRAS.417..882D 2011MNRAS.417..882D
Crocker et al., Paper XI 2012MNRAS.421.1298C 2012MNRAS.421.1298C
Lablanche et al., Paper XII 2012MNRAS.424.1495L 2012MNRAS.424.1495L
Serra et al., Paper XIII 2012MNRAS.422.1835S 2012MNRAS.422.1835S
Krajnovic et al., Paper XIV 2013MNRAS.432.1768K 2013MNRAS.432.1768K
Cappellari et al., Paper XV 2013MNRAS.432.1709C 2013MNRAS.432.1709C
Bayet et al., Paper XVI 2013MNRAS.432.1742B 2013MNRAS.432.1742B
Krajnovic et al., Paper XVII 2013MNRAS.432.1768K 2013MNRAS.432.1768K
Alatalo et al., Paper XVIII 2013MNRAS.432.1796A 2013MNRAS.432.1796A
Sarzi et al., Paper XIX 2013MNRAS.432.1845S 2013MNRAS.432.1845S
Cappellari et al., Paper XX 2013MNRAS.432.1862C 2013MNRAS.432.1862C
Scott et al., Paper XXI 2013MNRAS.432.1894S 2013MNRAS.432.1894S
Martig et al., Paper XXII 2013MNRAS.432.1914M 2013MNRAS.432.1914M
Krajnovic et al., Paper XXIII 2013MNRAS.433.2812K 2013MNRAS.433.2812K, Cat. J/MNRAS/433/2812
Davis et al., Paper XXIV 2013MNRAS.429..534D 2013MNRAS.429..534D
Cappellari et al., Paper XXV 2013MNRAS.432.1709C 2013MNRAS.432.1709C
Bayet et al., Paper XXVI 2013MNRAS.432.1742B 2013MNRAS.432.1742B
Krajnovic et al., Paper XXVII 2013MNRAS.432.1768K 2013MNRAS.432.1768K
Alatalo et al., Paper XXVIII 2013MNRAS.432.1796A 2013MNRAS.432.1796A
McDermid et al., Paper XXX 2015MNRAS.448.3484M 2015MNRAS.448.3484M, Cat. J/MNRAS/448/3484
(End) Patricia Vannier [CDS] 09-Jun-2015