J/A+A/604/A119 SHARDS S0 and E/S0 with anti-truncated disc (Borlaff+, 2017)
Evolution of the anti-truncated stellar profiles of S0 galaxies since
z = 0.6 in the SHARDS survey. I. Sample and methods.
Borlaff A., Eliche-Moral M.C., Beckman J.E., Ciambur B.C.,
Perez-Gonzalez P.G., Barro G., Cava A., Cardiel N.
<Astron. Astrophys., 604, A119 (2017)>
=2017A&A...604A.119B 2017A&A...604A.119B (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxy catalogs ; Morphology ; Photometry
Keywords: methods: observational - methods: statistical -
galaxies: fundamental parameters - galaxies: structure -
galaxies: elliptical and lenticular, cD
Abstract:
The controversy about the origin of the structure of early-type
S0-E/S0 galaxies may be due to the difficulty of comparing surface
brightness profiles with different depths, photometric corrections and
point spread function (PSF) effects (which are almost always ignored).
We aim to quantify the properties of Type-III (anti-truncated) discs
in a sample of S0 galaxies at 0.2<z<0.6. In this paper, we present the
sample selection and describe in detail the methods to robustly trace
the structure in their outskirts and correct for PSF effects.
We have selected and classified a sample of 150 quiescent galaxies at
0.2<z<0.6 in the GOODS-N field. We performed a quantitative structural
analysis of 44 S0-E/S0 galaxies. We have corrected their surface
brightness profiles for PSF distortions and analysed the biases in the
structural and photometric parameters when the PSF correction is not
applied. Additionally, we have developed Elbow, an automatic
statistical method to determine whether a possible break is
significant - or not - and its type. We have made this method publicly
available.
We find 14 anti-truncated S0-E/S0 galaxies in the range 0.2<z<0.6
(∼30% of the final sample). This fraction is similar to the those
reported in the local Universe. In our sample, ∼25% of the Type-III
breaks observed in PSF-uncorrected profiles are artifacts, and their
profiles turn into a Type I after PSF correction. PSF effects also
soften Type-II profiles. We find that the profiles of Type-I S0 and
E/S0 galaxies of our sample are compatible with the inner profiles of
the Type-III, in contrast with the outer profiles.
We have obtained the first robust and reliable sample of 14
anti-truncated S0-E/S0 galaxies beyond the local Universe, in the
range 0.2<z<0.6. PSF effects significantly affect the shape of the
surface brightness profiles in galaxy discs even in the case of the
narrow PSF of HST/ACS images, so future studies on the subject should
make an effort to correct them.
Description:
The Survey for High-z Absorption Red and Dead Sources (SHARDS,
Perez-Gonzelez et al., 2013, Cat. J/ApJ/762/46) is an ESO/GTC Large
Program carried out with the OSIRIS instrument on the 10.4m Gran
Telescopio Canarias (GTC). This survey obtained data between 5000Å
and 9500Å for galaxies in the GOODS-N field down to magnitudes
m<26.5ABmag, in 25 medium band filters with a full width at half
maximum (FWHM) of ∼170Å. The main goal of this survey was to study
the properties of stellar populations of massive galaxies in quiescent
evolution at z=1.0-2.3 through the pseudospectra resulting from
the data of this photometric medium band filter system (the set is
equivalent to low resolution integral field spectroscopy, R∼50) and
deep ancillary broad-band data.
SHARDS data are available through the Rainbow Database (Barro et al.
2011, Cat. J/ApJS/193/13, Cat. J/ApJS/193/30) in compilation with
multiple photometric and spectroscopic data for several cosmological
fields, such as GOODS-N and GOODS-S, COSMOS, or the Extended Groth
Strip.
We present the first sample of S0 and E/S0 galaxies with
anti-truncated discs obtained beyond the local Universe (at
0.2<z<0.6), on the basis of PSF-corrected surface brightness profiles.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 114 150 Properties of the initial red sample and
morphological classification
tableb1.dat 172 44 Profile classification and photometric
parameters of S0 and E/S0 galaxies at 0.2<z<0.6
in the GOODS-N field
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See also:
J/ApJS/193/13 : Spitzer/IRAC sources in the EGS I. SEDs (Barro+, 2011)
J/ApJS/193/30 : UV-to-FIR analysis of sources in the EGS. II. (Barro+, 2011)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/150] Sequential number
5- 10 A6 --- --- [SHARDS]
11- 18 I8 --- SHARDS SHARDS identification number
20- 27 F8.4 deg RAdeg Right ascension (J2000)
29- 35 F7.4 deg DEdeg Declination (J2000)
37- 41 A5 --- MType Morphological type (1)
43- 46 F4.2 --- zphot Photometric redshift
48- 53 F6.4 --- zspec ?=- Spectroscopic redshift (when available)
55- 60 F6.3 [Msun] logM* Decimal logarithm of the stellar mass
62- 66 F5.3 [Msun] e_logM* rms uncertainty on logM*
68 A1 --- l_SFR [-] Upper limit flag (2)
69- 74 F6.3 Msun/yr SFR Total SFR (2)
76- 81 F6.2 mag VMAG Absolute synthetic rest-frame magnitude in
Johnson V band from the Rainbow database
(Sect. 2.5)
83- 88 F6.2 mag KsMAG Absolute synthetic rest-frame magnitude in
Ks band from the Rainbow database
(Sect. 2.5)
90- 95 F6.3 10-2mag AF775W Milky Way extinction in the F775W band
97-101 F5.3 10-2mag E_AF775W Error on AF775W (upper value)
103-107 F5.3 10-2mag e_AF775W Error on AF775W (lower value)
109-114 F6.3 mag R-F775W ?=- Estimated K-correction for the F775W
filters to the Steidel R band (3)
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Note (1): Morphological classification as follows:
E = elliptical
E/S0 = E/S0
S0 = S0
Sp = spiral
CPSTB = compact post-starburst
OM = ongoing merger
GP = green pea (compact extremely star-forming galaxies)
DF = diffuse galaxy
Note (2): Total SFR (from the emission in 24um and 2800Å provided in the
Rainbow database, following the procedure described in Barro et al.,
2013ApJ...765..104B 2013ApJ...765..104B). Negative values (in column l_SFR) correspond to upper
limits following the notation on the Rainbow Database (see Sect. 3).
Note (3): for the redshift of each galaxy considering the fit in Eq. (8)
(see Sect. 2.5).
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq [1/44] Numerical ID in our final sample
of S0 and E/S0 galaxies at 0.2<z<0.6
3 A1 --- n_Seq [*] Note on Seq (1)
5- 10 A6 --- --- [SHARDS]
11- 18 I8 --- SHARDS SHARDS identification number
(release DR2 beta)
20- 22 A3 --- Type Profile type
24- 25 I2 deg i Galaxy inclination
27- 32 F6.3 mag/arcsec+2 mub ?=- Surface brightness of the profile at
the break radius µbreak
34- 38 F5.3 mag/arcsec+2 E_mub ? Error on mub (upper value)
40- 44 F5.3 mag/arcsec+2 e_mub ? Error on mub (lower value)
46- 50 F5.2 kpc Rb ?=- Break radius
52- 55 F4.2 kpc E_Rb ? Error on Rb (upper value)
57- 60 F4.2 kpc e_Rb ? Error on Rb (lower value)
62- 67 F6.3 mag/arcsec+2 mu0i Central surface brightness of the inner
profile µ0,i
69- 73 F5.3 mag/arcsec+2 E_mu0i ? Error on mu0i (upper value)
75- 79 F5.3 mag/arcsec+2 e_mu0i ? Error on mu0i (lower value)
81- 85 F5.3 kpc hi Scale-length of the inner profile
87- 91 F5.3 kpc E_hi Error on hi (upper value)
93- 97 F5.3 kpc e_hi Error on hi (lower value)
99-103 F5.2 mag/arcsec+2 mu0o ?=- Central surface brightness of the
outer profile µ0,o
105-108 F4.2 mag/arcsec+2 E_mu0o ? Error on mu0o (upper value)
110-113 F4.2 mag/arcsec+2 e_mu0o ? Error on mu0o (lower value)
115-119 F5.3 kpc ho ?=- Scale-length of the outer profile
121-125 F5.3 kpc E_ho ? Error on ho (upper value)
127-131 F5.3 kpc e_ho ? Error on ho (lower value)
132 A1 --- l_Ph Limit flag on Ph
133-138 E6.2 --- Ph Elbow p-value for the likelihood that
hi and ho are equal
140 A1 --- l_Pmu0 Limit flag on Pmu0
141-146 E6.2 --- Pmu0 Elbow p-value for for the likelihood
that mu0o and mu0o are equal
148-153 F6.3 kpc R23 Isophotal radius for 23mag/arcsec2 of
the object in the corrected Steidel R
band
155-159 F5.3 kpc E_R23 Error on R23 (upper value)
161-165 F5.3 kpc e_R23 Error on R23 (lower value)
167-172 F6.3 kpc Rlim Limiting radius of the profile
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Note (1): * indicates objects in the AGN subsample (see Sect. 2.8).
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Oct-2017