2002MNRAS.330...69D

Query : 2002MNRAS.330...69D

2002MNRAS.330...69D - Mon. Not. R. Astron. Soc., 330, 69-74 (2002/February-2)

New light on the search for low-metallicity galaxies - I. The N2 calibrator.

DENICOLO G., TERLEVICH R. and TERLEVICH E.

Abstract (from CDS):

We present a simple metallicity estimator based on the logarithmic [NII] λ6584/Hα ratio, hereafter N2, which we envisage will become very useful for ranking galaxies in a metallicity sequence from redshift survey-quality data even for moderately low spectral resolution.

We have calibrated the N2 estimator using a compilation of HII galaxies having accurate oxygen abundances, plus photoionization models covering a wide range of abundances. The comparison of models and observations indicates that both primary and secondary nitrogen are important for the relevant range of metallicities.

The N2 estimator follows a linear relation with log(O/H) that holds for the whole abundance range covered by the sample, from approximately 1/50th to twice the Solar value [7.2<12+log(O/H)<9.1]. We suggest that the ([Sii] λλ6717,6731/Hα ratio (hereafter S2) can also be used as a rough metallicity indicator. Because of its large scatter the S2 estimator will be useful only in systems with very low metallicity, where [Nii] λ 6584 is not detected or in low-resolution spectra where [Nii] λ 6584 is blended with Hα


Abstract Copyright: 2002 Blackwell Science Ltd

Journal keyword(s): galaxies: abundances - galaxies: evolution - galaxies: stellar content

Simbad objects: 95

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Number of rows : 95
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 FRL 2 G 00 10 18.4761464136 -57 06 36.664863012   15.36       ~ 30 0
2 NGC 588 HII 01 32 45.2 +30 38 54 14.59 14.40 14.44 14.89 15.16 ~ 126 1
3 IC 131 HII 01 33 15.0 +30 45 09   12.52       ~ 66 0
4 NGC 595 HII 01 33 33.53 +30 41 29.8           ~ 213 0
5 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
6 BCLMP 93 HII 01 33 52.3 +30 39 18     13.4     ~ 17 0
7 IC 142 HII 01 33 55.1 +30 45 22   11.30 14.2     ~ 40 0
8 NGC 604 HII 01 34 32.1 +30 47 01           ~ 608 0
9 [BKG99] NGC 628 7 HII 01 36 35.5 +15 50 11           ~ 19 0
10 M 74 G 01 36 41.7451236624 +15 47 01.107512304 10.52 10.00 9.46 9.16   ~ 1934 1
11 Z 415-15 AG? 02 51 04.57 +04 27 13.9 14.76 15.07 14.70 14.50 14.29 ~ 127 0
12 CDT NGC 1232 3 HII 03 09 45.5849 -20 36 22.000           ~ 13 0
13 CDT NGC 1232 4 HII 03 09 46.7952 -20 33 10.000           ~ 11 0
14 CDT NGC 1232 2 HII 03 09 49.3583 -20 33 03.000           ~ 7 0
15 CDT NGC 1232 1 HII 03 09 49.5010 -20 33 43.000           ~ 14 0
16 SBSG 0335-052 AGN 03 37 44.06 -05 02 40.2     16.65     ~ 500 1
17 CDT NGC 1637 1 HII 04 41 31.1373 -02 51 58.000           ~ 5 0
18 2MASX J04420810-3801108 H2G 04 42 08.110 -38 01 10.88 15.66 17.21 15.80 16.00   ~ 54 0
19 UGCA 116 AGN 05 55 42.645 +03 23 32.23 10.74 11.68 11.46   11.82 ~ 561 0
20 SCHG 0633-415 H2G 06 35 09.70 -41 33 30.0           ~ 28 0
21 Mrk 5 H2G 06 42 15.53 +75 37 32.6   17.0       ~ 114 0
22 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1887 1
23 LEDA 2790884 QSO 08 25 55.5166210656 +35 32 31.833368556   18.2       ~ 128 1
24 Z 331-51 GiG 08 37 03.00 +69 46 31.0 15.70 15.46 14.98 14.89   ~ 316 0
25 LEDA 3090963 H2G 08 42 20.941 +11 50 00.39           ~ 42 0
26 Mrk 116 AGN 09 34 02.1 +55 14 25           ~ 1179 1
27 SBSG 0940+544N G 09 44 16.70 +54 11 33.0           ~ 28 0
28 Z 265-44 Sy1 09 49 30.3096198376 +55 34 46.971972356   15.7       ~ 75 0
29 LEDA 28398 EmG 09 51 31.7596930512 +52 59 35.987746452   18       ~ 45 0
30 ESO 435-20 rG 09 59 21.226 -28 08 00.04   14.42 14.08 13.33   ~ 84 2
31 NGC 3125 AGN 10 06 33.318 -29 56 07.32 13.03 13.45 13.00 12.50 13.4 ~ 253 2
32 MCG-05-24-025 H2G 10 10 47.0262266088 -28 54 05.764195008   14.83 17 13.30   ~ 51 0
33 NGC 3310 AGN 10 38 45.85707 +53 30 11.8940   12.45 12.15     ~ 809 1
34 [PDT93] E HII 10 38 46.109 +53 30 16.04           ~ 7 0
35 MCG+05-26-046 SBG 11 04 58.298 +29 08 16.54   15.5 15.29     ~ 228 0
36 LEDA 34574 H2G 11 18 28.7 -32 53 10   18.0       ~ 21 0
37 Mrk 1450 AGN 11 38 35.6552554896 +57 52 26.636623644   15.5       ~ 130 1
38 6dFGS gJ115111.7-203557 H2G 11 51 11.7 -20 35 56   15.67   15.35   ~ 87 1
39 LEDA 37102 Sy1 11 51 33.3537570144 -02 22 21.893502576   17       ~ 179 0
40 Z 12-111 Sy1 11 52 37.19 -02 28 09.9   14.79   14.09 14.9 ~ 184 0
41 Mrk 193 H2G 11 55 28.34 +57 39 52.0   16.5       ~ 63 0
42 LEDA 37578 Sy1 11 57 12.4477194312 +02 28 28.039855080   18       ~ 39 0
43 LEDA 2815986 AG? 12 02 02.4750603336 +54 15 51.049196784   18.0       ~ 77 0
44 LEDA 39055 EmG 12 14 02.4588226248 +53 45 17.525587212   18       ~ 87 0
45 [H82] NGC 4214 23 Cl* 12 15 39.558 +36 19 32.20           ~ 18 0
46 [H82] NGC 4214 11 Cl* 12 15 40.539 +36 19 30.25           ~ 10 0
47 HK NGC 4214 55 Cl* 12 15 40.7700 +36 19 11.060           ~ 12 0
48 LEDA 39402 AGN 12 17 17.093 -28 02 32.67   17       ~ 143 0
49 NAME CVn I dwA GiC 12 38 40.06 +32 46 00.5 16.91 16.66 16.73 16.62   ~ 242 0
50 FRL 30 Sy1 12 39 15.1501235304 -40 11 10.533215256   16   16.59   ~ 39 0
51 LEDA 2790846 EmG 12 51 52.4 +49 03 25   18.0       ~ 55 0
52 LEDA 45016 EmO 13 02 36.4 -11 26 14   17.37       ~ 23 0
53 LEDA 45101 EmO 13 03 26.6 -14 46 08           ~ 19 0
54 LEDA 45394 EmG 13 06 42.43 -12 04 22.2           ~ 31 0
55 ESO 323-83 AG? 13 07 21.4286 -38 54 43.752   16.89   16.15   ~ 31 0
56 LEDA 45469 H2G 13 07 37.4 -35 38 36   17       ~ 30 0
57 MCG-02-34-008 EmG 13 11 58.16 -12 03 51.8   14.2   14.00 14.7 ~ 59 0
58 IC 4249 EmG 13 27 06.5667095424 -27 57 23.385136788   14.48 14.57 13.52 13.87 ~ 86 0
59 CCM 72 HII 13 29 44.200 +47 10 23.58           ~ 28 0
60 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4565 4
61 CCM 10 HII 13 29 59.700 +47 13 58.87           ~ 30 0
62 CCM 24 HII 13 30 00.900 +47 13 05.02           ~ 10 0
63 SBSG 1331+493N G 13 33 +49.0           ~ 7 0
64 ESO 383-43 AG? 13 37 08.3 -32 55 32   15.81   15.79 17.02 ~ 30 0
65 Mrk 67 EmG 13 41 56.4808997304 +30 31 09.652262088   16.5       ~ 96 0
66 2MASX J13482230-4221138 H2G 13 48 22.2996191952 -42 21 14.086526796   17       ~ 38 0
67 NGC 5455 H2G 14 03 01.17 +54 14 29.4           ~ 105 0
68 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 3138 2
69 NGC 5461 HII 14 03 40.96 +54 19 02.4           ~ 195 0
70 NGC 5471 EmG 14 04 28.627 +54 23 52.84           ~ 250 1
71 CXOU J140429.1+542353 SNR 14 04 29.1 +54 23 53           ~ 37 0
72 NGC 5471A HII 14 04 29.50 +54 23 47.1           ~ 22 0
73 NAME Cambridge 1409+1200 H2G 14 11 40.50 +11 45 29.0           ~ 14 0
74 Z 219-66 QSO 14 17 01.716 +43 30 13.52   15.6       ~ 181 0
75 Mrk 475 AGN 14 39 05.4743306976 +36 48 21.838203540   17.0       ~ 109 0
76 Z 193-4 H2G 14 50 56.495 +35 34 18.27   14.5 14.83     ~ 212 0
77 ESO 513-11 PaG 15 00 27.10 -26 26 57.0   15.85       ~ 54 0
78 GB1 1533+470 rG 15 35 00.00 +46 49 06.0   16.0       ~ 19 0
79 LEDA 140535 AGN 15 45 43.5456237456 +08 58 01.398139032     16.0     ~ 56 0
80 UCM 1612+1308 EmG 16 15 17.02165 +13 01 33.0873   18.05       ~ 22 0
81 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
82 KD D26 HII 19 45 05.2 -14 43 13           ~ 55 0
83 NGC 7714 AGN 23 36 14.1257730600 +02 09 18.197422668   14.91 14.36     ~ 788 1
84 APG 284 PaG 23 36 19 +02 09.3   12.6       ~ 608 0
85 [H76] 5 HII ~ ~           ~ 5 0
86 [H76] 3 HII ~ ~           ~ 5 0
87 NGC 5471E HII ~ ~           ~ 7 0
88 [GPD95] C HII ~ ~           ~ 9 0
89 [GPD95] B HII ~ ~           ~ 9 0
90 [PDT93] M HII ~ ~           ~ 4 0
91 [PDT93] L HII ~ ~           ~ 3 0
92 NGC 5471C HII ~ ~           ~ 17 0
93 NGC 5471D HII ~ ~           ~ 16 0
94 [H76] 4 HII ~ ~           ~ 5 0
95 [GPD95] A HII ~ ~           ~ 12 0

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