J/AJ/150/71 Metal abundances of KISS galaxies. V. (Hirschauer+, 2015)
Metal abundances of KISS galaxies. V. Nebular abundances of 15 intermediate
luminosity star-forming galaxies.
Hirschauer A.S., Salzer J.J., Bresolin F., Saviane I., Yegorova I.
<Astron. J., 150, 71 (2015)>
=2015AJ....150...71H 2015AJ....150...71H (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; H II regions ; Spectroscopy ; Redshifts ;
Abundances
Keywords: galaxies: abundances - galaxies: starburst - H II regions
Abstract:
We present high signal-to-noise ratio spectroscopy of 15 emission-line
galaxies cataloged in the KPNO International Spectroscopic Survey,
selected for their possession of high equivalent width [OIII] lines.
The primary goal of this study was to attempt to derive direct-method
(Te) abundances for use in constraining the upper-metallicity branch
of the R23 relation. The spectra cover the full optical region from
[OII]λλ3726,3729 to [SIII]λλ9069,9531 and
include the measurement of [OIII]λ4363 in 13 objects. From
these spectra, we determine abundance ratios of helium, nitrogen,
oxygen, neon, sulfur, and argon. We find these galaxies to
predominantly possess oxygen abundances in the range of
8.0≲12+log(O/H)≲8.3. We present a comparison of direct-method
abundances with empirical strong-emission-line techniques, revealing
several discrepancies. We also present a comparison of direct-method
oxygen abundance calculations using electron temperatures determined
from emission lines of O++ and S++, finding a small systematic
shift to lower Te(∼1184K) and higher metallicity (∼0.14dex) for
sulfur-derived Te compared to oxygen-derived Te. Finally, we
explore in some detail the different spectral activity types of
targets in our sample, including regular star-forming galaxies, those
with suspected AGN contamination, and a local pair of low-metallicity,
high-luminosity compact objects.
Description:
Our spectroscopic targets for this project were potentially metal-rich
galaxies identified by KPNO International Spectroscopic Survey (KISS;
Salzer et al., 2000AJ....120...80S 2000AJ....120...80S). KISS used low-dispersion
objective-prism spectra to identify emission-line galaxy (ELG)
candidates via detection of line emission in galaxies with redshifts
of less than 0.095. The "red" survey (Salzer et al. 2001, cat.
J/AJ/121/66; Gronwall et al. 2004, cat. J/AJ/127/1943; Jangren et al.
2005, cat. J/AJ/130/2571) cataloged objects by means of the Hα
line, while the "blue" survey (Salzer et al. 2002, cat. J/AJ/123/1292)
distinguished objects through strong [OIII]λ5007 line emission.
The 15 galaxies discussed in this paper were chosen from the KISS
Hα-selected catalog.
Spectra of 15 KISS ELGs were obtained using the Keck I 10m telescope
on 2006 May 25 with the Low-Resolution Imaging Spectrometer (LRIS), a
double spectrograph that includes a dichroic that directs light toward
a red and a blue side. The use of two distinct dispersion elements and
cameras enables simultaneous spectral coverage spanning from ∼3000 to
∼10000Å with good dispersion. Blue side exposures used the 600/400
grism, with a dispersion of 0.63Å/pixel, a resolution of ∼6Å,
and wavelength coverage between ∼3000 and ∼5600Å. Red side
exposures used the 900/5500 grating, with a dispersion of
0.53Å/pixel, a resolution of ∼3Å, and wavelength coverage
between ∼5700 and ∼7300Å. Each galaxy was first observed using the
blue and red sides simultaneously to determine if further observations
would yield usable spectra. If the raw spectra were of substantially
high quality, the red side grating was switched to observe
near-infrared (NIR) lines. This was completed for ten of the fifteen
galaxies. For NIR exposures, the red side was switched to the 400/8500
grating, with a dispersion of 1.16Å/pixel, a resolution of ∼6Å,
and wavelength coverage between ∼6300 and ∼10000Å in order to
observe the NIR [SIII] nebular lines at λ9069 and λ9531.
Typical individual exposure times were 600s, although some targets
necessitated individual exposure times of 1200, 900, or 300s. Exposure
time information is listed in Table1.
Results of our spectroscopic observations of the Keck sample,
presented as reddening-corrected line ratios relative to Hβ, are
presented in Table2.
We calculate the He/H, N/H, N/O, O/H, Ne/H, Ne/O, S/H, S/O, Ar/H, and
Ar/O ratios for each galaxy. Our results are presented in Table3.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 83 15 Object parameters and identifiers for observed
galaxies
table2.dat 205 38 Emission-line intensity ratios relative to
Hβ for observed galaxies
table3.dat 130 11 Electron densities, temperatures, and ionic
abundances
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See also:
J/AJ/130/2584 : KISS emission-line galaxy candidates. IV (Salzer+, 2005)
J/AJ/130/2571 : KISS Hα-selected survey list 3 (Jangren+, 2005)
J/AJ/130/496 : KISS emission-line galaxy candidates (Jangren+, 2005)
J/AJ/127/1943 : KISS Hα survey list 2 (Gronwall+, 2004)
J/AJ/123/1292 : KISS III. [O III]-selected survey list (Salzer+, 2002)
J/AJ/121/66 : KISS Hα survey list 1 (Salzer+, 2001)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- KISSR [148/2132] Identification number in KPNO
International Spectroscopic Survey (KISS)
("red" survey) (G1)
6- 10 A5 --- Field Survey field identifier
12- 15 I4 --- KISS [317/8836] KPNO International Spectroscopic
Survey (KISS) identification number
17- 18 I2 h RAh Hour of Right Ascension (J2000)
20- 21 I2 min RAm Minute of Right Ascension (J2000)
23- 26 F4.1 s RAs Second of Right Ascension (J2000)
28 A1 --- DE- Sign of the Declination (J2000)
29- 30 I2 deg DEd Degree of Declination (J2000)
32- 33 I2 arcmin DEm Arcminute of Declination (J2000)
35- 36 I2 arcsec DEs Arcsecond of Declination (J2000)
38- 42 F5.2 mag Bmag [16.5/19.4] The apparent B-band magnitude
44- 49 F6.2 mag BMag [-20.5/-15.9] The absolute B-band magnitude
51- 57 F7.5 --- z [0.007/0.092] Redshift
59 I1 --- o_Tblue1 [1/3] Number of Tblue1 (1)
61- 64 I4 s Tblue1 [600/1200] Time of first blue side exposure (1)
66 I1 --- o_Tblue2 [1]? Number of Tblue2 (1)
68- 70 I3 s Tblue2 [300/600]? Time of second blue side exposure (1)
72 I1 --- o_Tred [1/2] Number of Tred (1)
74- 77 I4 s Tred [600/1200] Time of red side exposure (1)
79 I1 --- o_TNIR [1]? Number of TNIR (1)
81- 83 I3 s TNIR [300/600]? Time of near-infrared exposure (1)
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Note (1): Spectra were obtained using the Keck I 10m telescope with the
Low-Resolution Imaging Spectrometer (LRIS), a double spectrograph that
includes a dichroic that directs light toward a red and a blue side. Each
galaxy was first observed using the blue and red sides simultaneously to
determine if further observations would yield usable spectra. If the raw
spectra were of substantially high quality, the red side grating was
switched to observe near-infrared (NIR) lines.
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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- 20 A20 --- Ion Ion designation
22- 25 I4 0.1nm lambda [3727/9531] Wavelength λ; in Å
27- 31 F5.3 --- I148 [0.006/3.3]? KISSR 0148 emission-line intensity (1)
33- 37 F5.3 --- e_I148 [0.002/0.14]? Uncertainty in I148
39- 43 F5.3 --- I242 [0.006/4.1]? KISSR 0242 emission-line intensity (1)
45- 49 F5.3 --- e_I242 [0.001/0.13]? Uncertainty in I242
51- 55 F5.3 --- I258 [0.01/3.3]? KISSR 0258 emission-line intensity (1)
57- 61 F5.3 --- e_I258 [0.003/0.14]? Uncertainty in I258
63- 67 F5.3 --- I451 [0.008/4]? KISSR 0451 emission-line intensity (1)
69- 73 F5.3 --- e_I451 [0.001/0.17]? Uncertainty in I451
75- 79 F5.3 --- I475 [0.004/3.6]? KISSR 0475 emission-line intensity (1)
81- 85 F5.3 --- e_I475 [0.001/0.15]? Uncertainty in I475
87- 91 F5.3 --- I512 [0.01/2.8]? KISSR 0512 emission-line intensity (1)
93- 97 F5.3 --- e_I512 [0.003/0.06]? Uncertainty in I512
99-103 F5.3 --- I590 [0.01/3.6]? KISSR 0590 emission-line intensity (1)
105-109 F5.3 --- e_I590 [0.002/0.15]? Uncertainty in I590
111-115 F5.3 --- I653 [0.009/3]? KISSR 0653 emission-line intensity (1)
117-121 F5.3 --- e_I653 [0.001/0.13]? Uncertainty in I653
123-127 F5.3 --- I1056 [0.02/3.3]? KISSR 1056 emission-line intensity (1)
129-133 F5.3 --- e_I1056 [0.002/0.14]? Uncertainty in I1056
135-139 F5.3 --- I1379 [0.004/3.1]? KISSR 1379 emission-line intensity (1)
141-145 F5.3 --- e_I1379 [0.001/0.13]? Uncertainty in I1379
147-151 F5.3 --- I1734 [0.004/5]? KISSR 1734 emission-line intensity (1)
153-157 F5.3 --- e_I1734 [0.001/0.12]? Uncertainty in I1734
159-163 F5.3 --- I1955 [0.009/3.5]? KISSR 1955 emission-line intensity (1)
165-169 F5.3 --- e_I1955 [0.003/0.15]? Uncertainty in I1955
171-175 F5.3 --- I2117 [0.006/3.5]? KISSR 2117 emission-line intensity (1)
177-181 F5.3 --- e_I2117 [0.001/0.15]? Uncertainty in I2117
183-187 F5.3 --- I2125 [0.005/3.5]? KISSR 2125 emission-line intensity (1)
189-193 F5.3 --- e_I2125 [0.001/0.16]? Uncertainty in I2125
195-199 F5.3 --- I2132 [0.008/4.2]? KISSR 2132 emission-line intensity (1)
201-205 F5.3 --- e_I2132 [0.002/0.2]? Uncertainty in I2132
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Note (1): Relative to Hβ.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- KISSR [148/2132] Identification number in KPNO
International Spectroscopic Survey (KISS)
("red" survey) (G1)
6- 10 I5 K Te [9751/13610] Electron temperature (1)
12- 14 I3 K e_Te [136/516] Error in Te
16- 20 F5.1 cm-3 Ne [15.7/114] Measured electron density (2)
22- 25 F4.1 cm-3 e_Ne [23.6/34]? Error in Ne
27- 31 F5.2 --- He/H [10.8/11]? 12+log(He/H) abundance ratio
33- 36 F4.2 --- e_He/H [0.01/0.05]? Error in He/H
38- 41 F4.2 --- N/H [6.8/7.2] 12+log(N/H) abundance ratio
43- 46 F4.2 --- e_N/H [0.02/0.05] Error in N/H
48- 52 F5.2 --- N/O [-1.3/-0.9] log(N/O) abundance ratio
54- 57 F4.2 --- e_N/O [0.02/0.08] Error in N/O
59- 62 F4.2 --- O/H [7.9/8.4] 12+log(O/H) abundance ratio
64- 67 F4.2 --- e_O/H [0.02/0.06] Error in O/H
69- 72 F4.2 --- Ne/H [7.2/7.6] 12+log(Ne/H) abundance ratio
74- 77 F4.2 --- e_Ne/H [0.02/0.09] Error in Ne/H
79- 83 F5.2 --- Ne/O [-0.8/-0.6] log(Ne/O) abundance ratio
85- 88 F4.2 --- e_Ne/O [0.01/0.04] Error in Ne/O
90- 93 F4.2 --- S/H [6/6.9] 12+log(S/H) abundance ratio
95- 98 F4.2 --- e_S/H [0.02/0.07] Error in S/H
100-104 F5.2 --- S/O [-2.1/-1.25] log(S/O) abundance ratio
106-109 F4.2 --- e_S/O [0.02/0.07] Error in S/O
111-114 F4.2 --- Ar/H [5/6]? 12+log(Ar/H) abundance ratio
116-119 F4.2 --- e_Ar/H [0.02/0.06]? Error in Ar/H
121-125 F5.2 --- Ar/O [-3/-2]? log(Ar/O) abundance ratio
127-130 F4.2 --- e_Ar/O [0.01/0.08]? Error in Ar/O
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Note (1): Determined by the oxygen line ratio
[OIII]λ4363/[OIII]λλ4959,5007.
Note (2): Determined using the [SII]λ6716/λ6731 ratio.
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Global Notes:
Note (G1): The "red" survey (Salzer et al. 2001, cat. J/AJ/121/66; Gronwall et
al. 2004, cat. J/AJ/127/1943; Jangren et al. 2005, cat. J/AJ/130/2571)
cataloged objects by means of the Hα line, while the "blue" survey
(Salzer et al. 2002, cat. J/AJ/123/1292) distinguished objects through
strong [OIII]λ5007 line emission.
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History:
From electronic version of the journal
References:
Melbourne & Salzer, Paper I 2002AJ....123.2302M 2002AJ....123.2302M
Melbourne et al., Paper II 2004AJ....127..686M 2004AJ....127..686M
Lee et al., Paper III 2004ApJ...616..752L 2004ApJ...616..752L
Salzer et al., Paper IV 2005ApJ...624..661S 2005ApJ...624..661S
(End) Prepared by [AAS]; Sylvain Guehenneux [CDS] 19-Jan-2016