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J/A+A/433/497  Nearby early-type galaxies with ionized gas. I. (Rampazzo+, 2005)

Nearby early-type galaxies with ionized gas. I. Line-strength indices of the underlying stellar population. Rampazzo R., Annibali F., Bressan A., Longhetti M., Padoan F., Zeilinger W.W. <Astron. Astrophys. 433, 497 (2005)> =2005A&A...433..497R
ADC_Keywords: Galaxies, nearby ; Galaxies, spectra ; Equivalent widths Keywords: galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters - galaxies: formation - galaxies: evolution Abstract: With the aim of building a data-set of spectral properties of well studied early-type galaxies showing emission lines, we present intermediate resolution spectra of 50 galaxies in the nearby Universe. The sample, which covers several of the E and S0 morphological sub-classes, is biased toward objects that might be expected to have ongoing and recent star formation, at least in small amounts, because of the presence of the emission lines. The emission is expected to come from the combination of active galactic nuclei and star formation regions within the galaxies. Sample galaxies are located in environments corresponding to a broad range of local galaxy densities, although predominantly in low density environments. Our long-slit spectra cover the 3700-7250Å wavelength range with a spectral resolution of approximately 7.6Å at 5550Å. The specific aim of this paper, and our first step in the investigation, is to map the underlying galaxy stellar population by measuring, along the slit positioned along the galaxy major axis, line-strength indices at several, homogeneous galacto-centric distances. For each object we extracted 7 luminosity-weighted apertures (with radii 1.5", 2.5", 10", re/10, re/8, re/4 and re/2) corrected for the galaxy ellipticity and 4 gradients (0<r<re/16, re/16<r<re/8, re/8<r<re/4 and re/4<r<re/2). For each aperture and gradient we measured 25 line-strength indices: 21 of the set defined by the Lick-IDS ``standard'' system (Trager et al., 1998, Cat. J/ApJS/116/1) and 4 introduced by Worthey & Ottaviani (1997, Cat. J/ApJS/111/377). Line-strength indices have been transformed to the Lick-IDS system. Indices derived then include Hβ, Mg1, Mg2, Mgb, MgFe, Fe5270, Fe5335 commonly used in classic index-index diagrams. The paper introduces the sample, presents the observations, describes the data reduction procedures, the extraction of apertures and gradients, the determination and correction of the line-strength indices, the procedure adopted to transform them into the Lick-IDS System and the procedures adopted for the emission correction. We finally discuss the comparisons between our dataset and line-strength indices available in the literature. A significant fraction, about 60%, of galaxies in the present sample has one previous measurement in the Lick-IDS system but basically restricted within the re/8 region. Line-strength measures obtained both from apertures and gradients outside this area and within the re/8 region, with the present radial mapping, are completely new. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 106 50 Overview of the observed sample table6.dat 31 336 Hβ corrections for apertures table7.dat 31 192 Hβ corrections for gradients table9.dat 385 336 Fully corrected Line-strength indices for the apertures table10.dat 385 192 Fully corrected Line-strength indices for the gradients
See also: J/A+A/445/79 : Nearby early-type gal. with ionized gas. II (Annibali+, 2006) J/A+A/463/455 : Nearby early-type gal. with ionized gas. III (Annibali+ 2007) J/A+A/519/A40 : Nearby early-type gal. with ionized gas. IV (Annibali+, 2010) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Galaxy Galaxy designation 10- 11 I2 h RAh Right Ascension J2000 (hours) 13- 14 I2 min RAm Right Ascension J2000 (minutes) 16- 19 F4.1 s RAs Right Ascension J2000 (seconds) 21 A1 --- DE- Declination J2000 (sign) 22- 23 I2 deg DEd Declination J2000 (degrees) 25- 26 I2 arcmin DEm Declination J2000 (minutes) 28- 29 I2 arcsec DEs Declination J2000 (seconds) 32- 44 A13 --- MType(RSA) Morphological type from RSA (Cat. VII/51) 46- 58 A13 --- MType(RC3) Morphological type from RC3 (Cat. VII/155) 62- 64 I3 deg PA ? Position angle of the isophotes 66- 70 F5.2 mag B0mag Total corrected blue magnitude 73- 76 F4.2 mag B-V ? Total corrected (B-V) color 79- 82 F4.2 mag U-B ? Total corrected (U-B) color 86- 89 I4 km/s Vel Heliocentric systemic velocity (from Hypercat) 91- 94 F4.1 arcmin re Effective radius 97-100 F4.2 Mpc-3 rho ? Richness of the environment (gal.Mpc-3) 103-106 F4.2 --- eps Average ellipticity (1-b/a)
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Galaxy Galaxy designation 9 I1 --- Aperture Aperture code (G1) 12- 18 F7.3 0.1nm EWO[III] Equivalent width [OIII] 23 I1 --- Qual Quality of the measure (G1) 25- 31 F7.3 0.1nm EWHα Equivalent width Hα
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Galaxy Galaxy designation 9 I1 --- Gradient Gradient code (G1) 12- 18 F7.3 0.1nm EWO[III] Equivalent width [OIII] 23 I1 --- Qual Quality of the measure (G1) 25- 31 F7.3 0.1nm EWHα Equivalent width Hα
Byte-by-byte Description of file: table9.dat table10.dat
Bytes Format Units Label Explanations
1- 7 A7 -- Galaxy Galaxy designation 9 I1 -- iz [0/6] Indicates the aperture (table9) or the gradient (table10) code (G2) 11- 15 F5.3 --- r1 Relative aperture radius (lower limit) 17- 21 F5.3 --- r2 Relative aperture radius (upper limit) 23- 27 F5.3 --- rwl Luminosity weighted radius 29- 32 F4.1 arcsec req Adopted equivalent radius 33- 34 A2 --- --- [00] 36- 41 F6.3 mag CN1 Line-strength index of CN1 43- 48 F6.3 mag CN2 Line-strength index of CN2 50- 55 F6.3 0.1nm Ca4227 Line-strength index of Ca4227 57- 62 F6.3 0.1nm G4300 Line-strength index of G4300 64- 69 F6.3 0.1nm Fe4383 Line-strength index of Fe4383 71- 76 F6.3 0.1nm Ca4455 Line-strength index of Ca4455 78- 83 F6.3 0.1nm Fe4531 Line-strength index of Fe4531 85- 90 F6.3 0.1nm Fe4668 Line-strength index of Fe4668 92- 97 F6.3 0.1nm Hbeta Line-strength index of Hβ 99-105 F7.3 0.1nm Fe5015 Line-strength index of Fe5015 107-112 F6.3 mag Mg1 Line-strength index of Mg1 114-119 F6.3 mag Mg2 Line-strength index of Mg2 121-126 F6.3 0.1nm Mgb Line-strength index of Mgb 128-133 F6.3 0.1nm Fe5270 Line-strength index of Fe5270 135-140 F6.3 0.1nm Fe5335 Line-strength index of Fe5335 142-147 F6.3 0.1nm Fe5406 Line-strength index of Fe5406 149-154 F6.3 0.1nm Fe5709 Line-strength index of Fe5709 156-161 F6.3 0.1nm Fe5782 Line-strength index of Fe5782 163-168 F6.3 0.1nm NaD Line-strength index of NaD 170-175 F6.3 mag TiO1 Line-strength index of TiO1 177-182 F6.3 mag TiO2 Line-strength index of TiO2 184-189 F6.3 0.1nm HdeltaA Line-strength index of HδA 191-197 F7.3 0.1nm HgammaA Line-strength index of HγA 199-204 F6.3 0.1nm HdeltaF Line-strength index of HδF 206-211 F6.3 0.1nm HgammaF Line-strength index of HγF 213-217 F5.3 mag e_CN1 Error on Line-strength index of CN1 219-224 F6.3 mag e_CN2 Error on Line-strength index of CN2 226-231 F6.3 0.1nm e_Ca4227 Error on Line-strength index of Ca4227 233-238 F6.3 0.1nm e_G4300 Error on Line-strength index of G4300 240-245 F6.3 0.1nm e_Fe4383 Error on Line-strength index of Fe4383 247-252 F6.3 0.1nm e_Ca4455 Error on Line-strength index of Ca4455 254-259 F6.3 0.1nm e_Fe4531 Error on Line-strength index of Fe4531 261-266 F6.3 0.1nm e_Fe4668 Error on Line-strength index of Fe4668 268-273 F6.3 0.1nm e_Hbeta Error on Line-strength index of Hβ 275-280 F6.3 0.1nm e_Fe5015 Error on Line-strength index of Fe5015 282-287 F6.3 mag e_Mg1 Error on Line-strength index of Mg1 289-294 F6.3 mag e_Mg2 Error on Line-strength index of Mg2 296-301 F6.3 0.1nm e_Mgb Error on Line-strength index of Mgb 303-308 F6.3 0.1nm e_Fe5270 Error on Line-strength index of Fe5270 310-315 F6.3 0.1nm e_Fe5335 Error on Line-strength index of Fe5335 317-322 F6.3 0.1nm e_Fe5406 Error on Line-strength index of Fe5406 324-329 F6.3 0.1nm e_Fe5709 Error on Line-strength index of Fe5709 331-336 F6.3 0.1nm e_Fe5782 Error on Line-strength index of Fe5782 338-343 F6.3 0.1nm e_NaD Error on Line-strength index of NaD 345-350 F6.3 mag e_TiO1 Error on Line-strength index of TiO1 352-357 F6.3 mag e_TiO2 Error on Line-strength index of TiO2 359-364 F6.3 0.1nm e_HdeltaA Error on Line-strength index of HδA 366-371 F6.3 0.1nm e_HgammaA Error on Line-strength index of HγA 373-378 F6.3 0.1nm e_HdeltaF Error on Line-strength index of HδF 380-385 F6.3 0.1nm e_HgammaF Error on Line-strength index of HγF
Global notes: Note (G1): When the emission is lower than the variance the quality is set to 0. When the emission is between 1 and 2σλ or larger than 2σλ the quality is set to 1 and 2 respectively. Note (G2): In tables 6 and 9, the aperture code is the following: 0: r = 1.5" 1: r = 2.5" 2: r = 10" 3: r = re/10 4: r = re/8 5: r = re/4 6: r = re/2 In table 7 and 10, the gradient code is: 0: 0 < r < re/16 1: re/16 < r < re/8 2: re/8 < r < re/4 3: re/4 < r < re/2
Acknowledgements: Roberto Rampazzo, rampazzo(at)pd.astro.it
(End) Patricia Vannier [CDS] 18-Jan-2005
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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