J/AJ/116/2805 H II regions in spiral galaxies (Van Zee+, 1998)
Spectroscopy of outlying H II regions in spiral galaxies:
abundances and radial gradients.
Van Zee L., Salzer J.J., Haynes M.P., O'Donoghue A.A., Balonek T.J.
<Astron. J. 116, 2805 (1998)>
=1998AJ....116.2805V 1998AJ....116.2805V
ADC_Keywords: H II regions ; Galaxies, optical ; Abundances
Keywords: galaxies: abundances - galaxies: ISM - galaxies: spiral
Abstract:
We present the results of low-dispersion optical spectroscopy of
186 HII regions spanning a range of radius in 13 spiral galaxies.
Abundances for several elements (oxygen, nitrogen, neon, sulfur, and
argon) were determined for 185 of the HII regions. As expected, low
metallicities were found for the outlying HII regions of these spiral
galaxies. Radial abundance gradients were derived for the 11 primary
galaxies; similar to results for other spiral galaxies, the derived
abundance gradients are typically -0.04 to -0.07dex/kpc.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 69 13 Galaxy properties
table2.dat 66 83 Spectroscopy observing log
table3.dat 138 188 H II region line strengths
table4.dat 109 188 H II region ratios
table5.dat 101 186 H II region abundances
table6.dat 56 11 Radial oxygen abundance gradients
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See also:
VII/118 : NGC 2000.0 (Sky Publishing, ed. Sinnott 1988)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- NGC/IC NGC or IC (Cat. VII/118) galaxy designation
10- 11 I2 h RAh Right ascension (J2000.0)
13- 14 I2 min RAm Right ascension (J2000.0)
16- 19 F4.1 s RAs Right ascension (J2000.0)
21 A1 --- DE- Declination sign (J2000.0)
22- 23 I2 deg DEd Declination (J2000.0)
25- 26 I2 arcmin DEm Declination (J2000.0)
28- 29 I2 arcsec DEs Declination (J2000.0)
31- 37 A7 --- MType Morphological type from RC3 (Cat. VII/155)
39- 43 F5.2 Mpc Dist Distance
45- 49 F5.1 mag BMAG Absolute B magnitude
51- 52 I2 deg i ? Inclination from the RC3 (Cat. VII/155)
54- 56 I3 deg PA ? Position angle from RC3 (Cat. VII/155)
58- 60 I3 arcsec R25 ? Isophotal radius from RC3 (Cat. VII/155)
62- 66 F5.1 arcsec Rad ? Radius
68- 69 I2 --- NHII Number of H II regions
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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- 8 A8 --- NGC/IC NGC or IC (Cat. VII/118) galaxy designation
11- 12 I2 --- Slit Slit number
14- 22 A9 --- [VSH98] HII region designation in the galaxy
(+XXX+YYY) (1)
23- 24 I2 h RAh Right ascension (J2000.0)
26- 27 I2 min RAm Right ascension (J2000.0)
29- 33 F5.2 s RAs Right ascension (J2000.0)
35 A1 --- DE- Declination sign (J2000.0)
36- 37 I2 deg DEd Declination (J2000.0)
39- 40 I2 arcmin DEm Declination (J2000.0)
42- 46 F5.2 arcsec DEs Declination (J2000.0)
48- 50 I3 deg PA Position angle
52- 59 A8 --- Run Run identification
61 I1 --- Nexp Number of exposures
62 A1 --- --- [x]
63- 66 I4 s Tint Integration time
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Note (1): [VSH98] NGC NNNN +XXX+YYY, [VSH98] IC NNNN +XXX+YYY in Simbad
+XXX east-west offset from the galaxy center in arcsec, east positive
+YYY north-south offset from the galaxy center in arcsec,
north positive
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- NGC/IC NGC or IC (Cat. VII/118) galaxy designation
10- 18 A9 --- [VSH98] HII region designation in the galaxy
(+XXX+YYY) (1)
19- 20 I2 --- Slit Slit number
22- 25 F4.2 --- [OII] Relative [O II]3727+3729 line strength (2)
27- 30 F4.2 --- e_[OII] rms uncertainty on [OII]
32- 36 F5.3 --- [NeIII] ? Relative [Ne III] 3869 line strength (2)
38- 42 F5.3 --- e_[NeIII] ? rms uncertainty on [NeIII]
44- 48 F5.3 --- [OIII] Relative [O III] 4959+5007 line strength (2)
50- 54 F5.3 --- e_[OIII] rms uncertainty on [OIII]
55 A1 --- n_[OIII] [*] *: only λ5007 detected (sum derived
assuming λ5007/λ4959=2.88)
56- 60 F5.3 --- [OI] ? Relative [O I] 6300 line strength (2)
62- 66 F5.3 --- e_[OI] ? rms uncertainty on [OI]
68- 72 F5.3 --- [SIII] ? Relative [S III] 6312 line strength (2)
74- 78 F5.3 --- e_[SIII] ? rms uncertainty on [SIII]
80- 83 F4.2 --- Halpha Relative Hα 6563 line strength (2)
85- 88 F4.2 --- e_Halpha rms uncertainty on Halpha
90- 94 F5.3 --- [NII] Relative [N II] 6548+6583 line strength (2)
96-100 F5.3 --- e_[NII] rms uncertainty on [NII]
102-106 F5.3 --- [SII] Relative [S II] 6717+6731 line strength (2)
108-112 F5.3 --- e_[SII] rms uncertainty on [SII]
114-118 F5.3 --- [ArIII] ? Relative [Ar III] 7136 line strength (2)
120-124 F5.3 --- e_[ArIII] ? rms uncertainty on [ArIII]
126-129 F4.2 --- cHbeta Reddening coefficient cHβ
131-134 F4.2 --- e_cHbeta rms uncertainty on cHbeta
136-138 I3 0.1nm EWHbeta Hbeta equivalent width
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Note (1): [VSH98] NGC NNNN +XXX+YYY, [VSH98] IC NNNN +XXX+YYY in Simbad
+XXX east-west offset from the galaxy center in arcsec, east positive
+YYY north-south offset from the galaxy center in arcsec,
north positive
Note (2): line strength relative to Hβ
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- NGC/IC NGC or IC (Cat. VII/118) galaxy
designation
10- 18 A9 --- [VSH98] HII region designation in the galaxy (1)
19- 23 F5.1 arcsec Rad ? Radius ? Deprojected radius
25- 26 I2 --- Slit Slit number
28- 30 I3 --- [OIII] ? Line ratio [O III]4959,5007/4363
32- 34 I3 --- e_[OIII] ? rms uncertainty on [O III]
36- 39 F4.2 --- [SII] Line ratio [S II]6717/6731
41- 44 F4.2 --- e_[SII] rms uncertainty on [S II]
46- 51 F6.3 --- log([OII]+[OIII]) log([O II]+[O III])
53- 57 F5.3 --- e_log([OII]+[OIII]) rms uncertainty on log([OII]+[OIII])
59- 64 F6.3 --- log([OIII]/[OII]) log([O III]/[O II])
66- 70 F5.3 --- e_log([OIII]/[OII]) rms uncertainty on log([OIII]/[OII])
72- 77 F6.3 --- log([NII]/Ha) log([N II]/Hα)
79- 83 F5.3 --- e_log([NII]/Ha) rms uncertainty on log([NII]/Ha)
85- 90 F6.3 --- log([NII]/[OII]) log([N II]/[O II])
92- 96 F5.3 --- e_log([NII]/[OII]) rms uncertainty on log([NII]/[OII])
98-103 F6.3 --- log([SII]/[OII]) log([S II]/[O II])
105-109 F5.3 --- e_log([SII]/[OII]) rms uncertainty on log([SII]/[OII])
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Note (1): [VSH98] NGC NNNN +XXX+YYY, [VSH98] IC NNNN +XXX+YYY in Simbad
+XXX east-west offset from the galaxy center in arcsec, east positive
+YYY north-south offset from the galaxy center in arcsec,
north positive
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- NGC/IC NGC or IC (Cat. VII/118) galaxy
designation
10- 18 A9 --- [VSH98] HII region designation in the galaxy (1)
19- 23 F5.1 arcsec Rad ? Deprojected radius
25- 26 I2 --- Slit Slit number
28- 32 I5 K T(O++) Temperature from O++
34- 37 I4 K e_T(O++) ? rms uncertainty on T(O++) (2)
39- 42 F4.2 --- 12+log(O/H) 12+log(O/H abundance
44- 47 F4.2 --- e_12+log(O/H) rms uncertainty on 12+log(O/H)
49- 53 F5.2 --- log(N/O) log(N/O) abundance ratio
55- 58 F4.2 --- e_log(N/O) rms uncertainty on log(N/O)
60- 64 F5.2 --- log(Ne/O) ? log(Ne/O) abundance ratio
66- 69 F4.2 --- e_log(Ne/O) ? rms uncertainty on log(Ne/O)
71- 75 F5.2 --- log(S/O) log(S/O) abundance ratio
77- 80 F4.2 --- e_log(S/O) rms uncertainty on log(S/O)
82- 86 F5.2 --- log(Ar/O) ? log(Ar/O) abundance ratio
88- 91 F4.2 --- e_log(Ar/O) ? rms uncertainty on log(Ar/O)
93- 96 F4.2 --- O/Hzkh Zaritsky et al. (1994ApJ...420...87Z 1994ApJ...420...87Z)
(O/H) abundance ratio
98-101 F4.2 --- O/Hep84 Edmunds & Pagel (1984MNRAS.211..507E 1984MNRAS.211..507E)
(O/H) abundance ratio
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Note (1): [VSH98] NGC NNNN +XXX+YYY, [VSH98] IC NNNN +XXX+YYY in Simbad
+XXX east-west offset from the galaxy center in arcsec, east positive
+YYY north-south offset from the galaxy center in arcsec,
north positive
Note (2): For NGC 4395 +088-119, T(O++)=8930+5790-1200K
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- NGC NGC (Cat. VII/118) galaxy designation
10- 11 I2 --- NHII Number of HII regions
13- 16 F4.2 --- 12+log(O/H) Central 12+log(O/H) abundance
18- 21 F4.2 --- e_12+log(O/H) rms uncertainty on 12+log(O/H)
23- 27 F5.2 --- Gradient1 Gradient in dex/r25
29- 32 F4.2 --- e_Gradient1 rms uncertainty on Gradient1
34- 38 F5.2 --- Gradient2 Gradient in dex/rd
40- 43 F4.2 --- e_Gradient2 rms uncertainty on Gradient2
45- 50 F6.3 --- Gradient3 Gradient in dex/kpc
52- 56 F5.3 --- e_Gradient3 rms uncertainty on Gradient3
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History: From AJ electronic version
(End) James Marcout, Patricia Bauer [CDS] 04-Feb-1999