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 (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:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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)
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). 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).
Byte-by-byte Description of file: tableb1.dat
Bytes Format Units Label Explanations
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
Note (1): * indicates objects in the AGN subsample (see Sect. 2.8).
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 25-Oct-2017
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