J/A+A/529/A149 HII regions in low-metallicity galaxies (Guseva+, 2011)
VLT spectroscopy of low-metallicity emission-line galaxies: abundance patterns
and abundance discrepancies.
Guseva N.G., Izotov Y.I., Stasinska G., Fricke K.J., Henkel C.,
Papaderos P.
<Astron. Astrophys., 529, A149 (2011)>
=2011A&A...529A.149G 2011A&A...529A.149G
ADC_Keywords: H II regions ; Spectroscopy ; Abundances
Keywords: galaxies: starburst - methods: observational - galaxies: abundances -
galaxies: dwarf - galaxies: ISM
Abstract:
We present deep spectroscopy of a large sample of low-metallicity
emission-line galaxies.
The main goal of this study is to derive element abundances in these
low-metallicity galaxies.
We analyze 121 VLT spectra of HII regions in 46 low-metallicity
emission-line galaxies. Of these spectra 83 are archival
VLT/FORS1+UVES spectra of HII regions in 31 low-metallicity
emission-line galaxies that are studied for the first time with
standard direct methods to determine the electron temperatures, the
electron number densities, and the chemical abundances.
Description:
From the ESO archive we selected VLT spectra of HII regions that were
obtained with the spectrographs UVES (high resolution) and FORS1 (low
and medium resolution).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 95 33 HII regions and galaxies observed with the VLT
table2.dat 79 83 Spectroscopic properties of HII regions
table3.dat 55 1346 Extinction-corrected emission line fluxes (UVES)
table3b.dat 42 31 Hβ fluxes (UVES observations)
table4.dat 55 794 Extinction-corrected emission line fluxes
(low-resolution FORS observations)
table4b.dat 42 22 Hβ fluxes (low-resolution FORS observations)
table5.dat 55 1232 Extinction-corrected emission line fluxes
(medium-resolution FORS observations)
table5b.dat 42 30 Hβ fluxes (medium-resolution FORS observations)
table6.dat 53 723 Ionic and total heavy element abundances (UVES)
table6b.dat 56 31 Electronic temperatures and column density (UVES)
table7.dat 53 466 Ionic and total heavy element abundances
(FORS low-resolution observations)
table7b.dat 56 22 Electronic temperatures and column density
(FORS low-resolution observations)
table8.dat 53 764 Ionic and total heavy element abundances
(FORS medium-resolution observations)
table8b.dat 56 30 Electronic temperatures and column density
(FORS medium-resolution observations)
table9.dat 96 25 Recombination lines: fluxes and ionic abundances
table10a.dat 90 62 Electron temperatures derived from emission line
flux ratios
table10b.dat 60 56 Electron number densities derived from emission line
flux ratios
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See also:
J/A+A/462/535 : Low-metallicity HII regions and galaxies (Yin+, 2007)
J/A+A/464/885 : Abundances in 53 HII regions (Guseva+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name HII region or galaxy name
16- 17 I2 h RAh Right ascension (J2000)
19- 20 I2 min RAm Right ascension (J2000)
22- 25 F4.1 s RAs Right ascension (J2000)
27 A1 --- DE- Declination sign (J2000)
28- 29 I2 deg DEd Declination (J2000)
31- 32 I2 arcmin DEm Declination (J2000)
34- 37 F4.1 arcsec DEs Declination (J2000)
39- 66 A28 --- Inst Instrument used
68- 95 A28 --- Prog ESO program
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name HII region name
19 A1 --- n_Name [egf] Sample (G1)
21- 24 F4.2 10+4K Te(OIII) Electronic temperature of OIII
26- 29 F4.2 10+4K e_Te(OIII) rms uncertainty on Te(OIII)
31- 34 F4.2 --- eps(O) Abundance of O (12+log(O/H))
36- 39 F4.2 --- e_eps(O) rms uncertainty on 12+logO/H
41- 44 I4 0.1nm W(Ha) Hα equivalent width
46 I1 0.1nm e_W(Ha) rms uncertainty on W(Ha)
49- 54 F6.1 10-19W/m2 F(Hb) Flux of Hβ emission line
56- 58 F3.1 10-19W/m2 e_F(Hb) rms uncertainty on F(Hb)
60- 64 F5.3 --- C(Hb) Hβ extinction coefficient
66- 70 F5.3 --- e_C(Hb) rms uncertainty on C(Hb)
72- 75 F4.1 % RF ?=- Flux ratio F([OIII]4363)/F(Hb) (1)
77- 79 F3.1 % e_RF ? rms uncertainty on RF
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Note (1): Fluxes non-corrected for extinction.
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Byte-by-byte Description of file: table[345].dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name HII region name
19- 22 I4 --- lambda Wavelength
24- 40 A17 --- Line Line designation
42- 48 F7.2 --- Flux ? Extinction-corrected emission line flux
on F(Hβ)=100 scale
51- 55 F5.2 --- e_Flux ?=- rms uncertainty on Flux
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Byte-by-byte Description of file: table[345]b.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name HII region name
19- 23 F5.3 --- C(Hb) Hβ extinction coefficient
25- 31 F7.2 10-19W/m2 F(Hb) Flux of Hβ emission line
33- 37 F5.1 0.1nm W(Hb) Hβ equivalent width
39- 42 F4.2 0.1nm W(abs) Absorption equivalent width
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Byte-by-byte Description of file: table[678].dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name Galaxy name
20- 35 A16 --- Param Parameter name
(ICF=Ionization Correction Factor)
38- 45 E8.3 --- Value ?=- Parameter value
47- 53 E7.3 --- e_Value ?=- rms uncertainty on Parameter value
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Byte-by-byte Description of file: table[678]b.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name HII region name
19- 23 I5 K Te(OIII) OIII electronic temperature
25- 27 I3 K e_Te(OIII) rms uncertainty on Te(OIII)
29- 33 I5 K Te(OII) OII electronic temperature
35- 37 I3 K e_Te(OII) rms uncertainty on Te(OII)
39- 43 I5 K Te(SIII) SIII electronic temperature
45- 47 I3 K e_Te(SIII) rms uncertainty on Te(SIII)
49- 52 I4 cm-3 Ne(SII) SII electron density
54- 56 I3 cm-3 e_Ne(SII) rms uncertainty on Ne(SII)
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Byte-by-byte Description of file: table9.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name HII region name
19 A1 --- n_Name [fe] Sample (G1)
21 A1 --- l_F(OII) Limit flag on F(OII)
22- 26 F5.2 10-20W/m2 F(OII) ?=- Flux in OII line
28- 32 F5.2 10-20W/m2 e_F(OII) ? rms uncertainty no F(OII)
34 A1 --- l_F(CII) Limit flag on F(CI)
35- 39 F5.2 10-20W/m2 F(CII) ?=- Flux in CII line
41- 44 F4.2 10-20W/m2 e_F(CII) ? rms uncertainty no F(CII)
46- 52 F7.2 10-19W/m2 F(Hb) Flux in Hβ
54- 57 F4.2 10-19W/m2 e_F(Hb) rms uncertainty on F(Hb)
59 A1 --- l_O++/H+ Limit flag on O++/H+
60- 64 F5.3 10-4 O++/H+ ?=- Abundance ratio O++/H+
from recombination lines
66- 70 F5.3 10-4 e_O++/H+ ? rms uncertainty on O++/H+
73- 77 F5.3 10-4 O++/H+c ?=- Abundance ratio O++/H+
from collisionally excited lines
79- 83 F5.3 10-4 e_O++/H+c ? rms uncertainty on O++/H+
85 A1 --- l_C++/H+ Limit flag on C++/H+
86- 90 F5.3 10-4 C++/H+ ?=- Abundance ratio C++/H+
from recombination lines
92- 96 F5.3 10-4 e_C++/H+ ? rms uncertainty on C++/H+
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Byte-by-byte Description of file: table10a.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Name HII region name
19 A1 --- n_Name [egfbc] Sample (G1)
22- 27 F6.4 10+4K Te(OIII) Electronic temperature of OIII
29- 34 F6.4 10+4K e_Te(OIII) rms uncertainty on Te(OIII)
36- 41 F6.4 10+4K Te(SIII) ?=- Electronic temperature of SIII
42 A1 --- u_Te(SIII) Uncertainty flag on Te(SIII)
43- 48 F6.4 10+4K e_Te(SIII) ? rms uncertainty on Te(SIII)
50- 55 F6.4 10+4K Te(NII) ?=- Electronic temperature of NII
57- 62 F6.4 10+4K e_Te(NII) ? rms uncertainty on Te(NII)
64- 69 F6.4 10+4K Te(OII) ?=- Electronic temperature of OII
71- 76 F6.4 10+4K e_Te(OII) ? rms uncertainty on Te(OII)
78- 83 F6.4 10+4K Te(SII) ?=- Electronic temperature of SII
85- 90 F6.4 10+4K e_Te(SII) ? rms uncertainty on Te(SII)
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Byte-by-byte Description of file: table10b.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name HII region name
20 A1 --- n_Name [egfb] Sample (G1)
22- 25 I4 cm-3 Ne(SII) SII electron density
27- 29 I3 cm-3 e_Ne(SII) rms uncertainty on Ne(SII)
32- 35 I4 cm-3 Ne(OII) ?=- OII electron density
37- 38 I2 cm-3 e_Ne(OII) ? rms uncertainty on Ne(OII)
41- 44 I4 cm-3 Ne(ClIII) ?=- ClIII electron density
46- 49 I4 cm-3 e_Ne(ClIII) ? rms uncertainty on Ne(ClIII)
52- 55 I4 cm-3 Ne(ArIV) ?=- ArIV electron density
57- 60 I4 cm-3 e_Ne(ArIV) ? rms uncertainty on Ne(ArIV)
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Global notes:
Note (G1): Samples as follows:
e = UVES data
f = medium resolution FORS data
g = low resolution FORS data
b = Izotov et al. (2009A&A...503...61I 2009A&A...503...61I)
c = Guseva et al. (2009A&A...505...63G 2009A&A...505...63G)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Aug-2011