2008ApJ...675.1213R

Query : 2008ApJ...675.1213R

2008ApJ...675.1213R - Astrophys. J., 675, 1213-1222 (2008/March-2)

The M33 metallicity project: resolving the abundance gradient discrepancies in M33.

ROSOLOWSKY E. and SIMON J.D.

Abstract (from CDS):

We present a new determination of the metallicity gradient in M33, based on Keck LRIS measurements of oxygen abundances using the temperature-sensitive emission line [O III] λ4363 in 61 H II regions. These data approximately triple the sample of direct oxygen abundances in M33. We find a central abundance of 12+log(O/H)=8.36±0.04 and a slope of -0.027±0.012 dex/kpc1, in agreement with infrared measurements of the neon abundance gradient but much shallower than most previous oxygen gradient measurements. There is substantial intrinsic scatter of 0.11 dex in the metallicity at any given radius in M33, which imposes a fundamental limit on the accuracy of gradient measurements that rely on small samples of objects. We also show that the ionization state of neon does not follow the ionization state of oxygen as is commonly assumed, suggesting that neon abundance measurements from optical emission lines require careful treatment of the ionization corrections.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Abundances - Galaxies: Individual: Messier Number: M33 - Galaxies: Spiral - ISM: H II Regions - ISM: Abundances - ISM: Evolution

VizieR on-line data: <Available at CDS (J/ApJ/675/1213): table1.dat table2.dat>

Nomenclature: Table 1: [RS2008] NN (Nos 1-61).

Simbad objects: 60

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Number of rows : 60
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 CPSDP 395 HII 01 32 39.80 +30 22 28.7           ~ 4 0
2 BCLMP 266 HII 01 32 40.7525774160 +30 24 24.644711448           ~ 5 0
3 CPSDP 398 HII 01 32 43.5 +30 35 18           ~ 3 0
4 CPSDP 400 HII 01 32 44.43 +30 35 16.7 14.94 18.776 18.753 18.193 18.580 ~ 6 0
5 NGC 588 HII 01 32 45.2 +30 38 54 14.59 14.40 14.44 14.89 15.16 ~ 122 1
6 BCLMP 261 GlC 01 32 54.5997867864 +30 23 20.524044768 16.60 16.59 16.72 16.94 17.931 ~ 10 0
7 BCLMP 243 HII 01 32 56.51 +30 27 28.4     11.3     ~ 5 0
8 BCLMP 233 HII 01 32 57.62 +30 35 58.6           ~ 5 0
9 CPSDP 18 HII 01 32 59.1 +30 24 23           ~ 2 0
10 CPSDP 21 HII 01 33 00.32 +30 24 33.0     16.72     ~ 3 0
11 BCLMP 218 HII 01 33 00.7 +30 30 51     11.9     ~ 8 0
12 CPSDP 22 HII 01 33 01.51 +30 24 32.6 16.66 16.74 16.87 17.03 17.34 ~ 5 0
13 BCLMP 258B HII 01 33 06.2 +30 23 27           ~ 2 0
14 BCLMP 259 HII 01 33 07.27 +30 23 07.0           ~ 3 0
15 CPSDP 403 GlC 01 33 07.610 +30 31 00.58 16.94 16.88 17.01 17.10 17.27 ~ 5 0
16 BCLMP 217 HII 01 33 07.99 +30 29 47.0     13.3     ~ 5 0
17 BCLMP 255 HII 01 33 09 +30 22.8           ~ 5 0
18 BCLMP 257 HII 01 33 09.54 +30 23 26.8           ~ 5 0
19 BCLMP 221 GlC 01 33 09.930 +30 27 23.54 14.38 14.29 14.32 14.27 13.97 ~ 11 0
20 CPSDP 23 HII 01 33 13.72 +30 29 46.8     13.3     ~ 3 0
21 CPSDP 34 HII 01 33 14.18 +30 27 10.8           ~ 3 0
22 CPSDP 121 GlC 01 33 17.070 +30 31 10.93 17.51 17.68 17.80 17.70 17.94 ~ 5 0
23 BCLMP 254 HII 01 33 21.2 +30 17 58 17.27 17.62 17.77 17.97 18.15 ~ 3 0
24 CPSDP 129A HII 01 33 23.4085134096 +30 31 35.131180512 18.36 18.50 18.52 18.33 18.189 ~ 6 0
25 BCLMP 222 HII 01 33 24.6814380384 +30 25 31.545750180 16.13 16.14 16.24 16.19 16.20 ~ 6 0
26 BCLMP 213 HII 01 33 27.72 +30 31 48.9     13.9     ~ 5 0
27 BCLMP 253 HII 01 33 29.34 +30 18 02.1           ~ 3 0
28 BCLMP 252 HII 01 33 30.71 +30 18 38.2           ~ 3 0
29 VGHC 2-40 HII 01 33 34.7 +30 32 13     14.7     ~ 12 0
30 BCLMP 33 HII 01 33 34.96 +30 37 05.7           ~ 6 0
31 BCLMP 23 HII 01 33 42.91 +30 33 30.1           ~ 5 0
32 BCLMP 38 HII 01 33 43.85 +30 38 45.8     13.9     ~ 8 0
33 BCLMP 248 HII 01 33 45.22 +30 21 37.8     13.9     ~ 6 0
34 BCLMP 27 HII 01 33 45.58 +30 36 48.6     15.2     ~ 12 0
35 BCLMP 18 HII 01 33 47.66 +30 33 37.6           ~ 4 0
36 BCLMP 29 HII 01 33 47.78 +30 38 37.6 15.82 15.91 16.05 16.07 16.50 ~ 6 0
37 BCLMP 43 HII 01 33 48.38 +30 39 35.6           ~ 12 0
38 BCLMP 16 HII 01 33 50.0734634832 +30 37 29.948424276 16.75 16.94 17.17 17.22 17.54 ~ 10 0
39 BCLMP 15 HII 01 33 50.15 +30 33 45.9           ~ 4 0
40 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5839 1
41 BCLMP 13 HII 01 33 54.29 +30 33 05.8     13.1     ~ 7 0
42 CPSDP 1A HII 01 33 59.72 +30 34 35.4     13.6     ~ 6 0
43 VGHC 2-77 HII 01 34 00.19 +30 40 50.0     15.4     ~ 18 0
44 BCLMP 1 HII 01 34 01.78 +30 35 49.7     14.3     ~ 6 0
45 BCLMP 90 HII 01 34 04.15 +30 38 08.2           ~ 12 0
46 BCLMP 83 HII 01 34 09.1 +30 39 10     13.7     ~ 6 0
47 CPSDP 184A HII 01 34 09.44 +30 34 20.0   18.00 18.80     ~ 3 0
48 CPSDP 208 HII 01 34 10.45 +30 39 15.6           ~ 5 0
49 BCLMP 710 Cl? 01 34 13.666 +30 33 43.35 15.67 15.75 15.90 15.94 16.22 ~ 23 0
50 BCLMP 714 HII 01 34 13.84 +30 34 50.8     14.5     ~ 6 0
51 VGHC 2-95 PoG 01 34 15.6 +30 37 11 14.69 14.61 14.70 14.85 14.97 ~ 23 0
52 BCLMP 723 HII 01 34 16 +30 39.4           ~ 3 0
53 VGHC 2-99 HII 01 34 17.3 +30 33 36     12.4     ~ 9 0
54 BCLMP 712 HII 01 34 19.31 +30 33 47.4           ~ 5 0
55 CPSDP 192 HII 01 34 19.8 +30 33 58           ~ 2 0
56 BCLMP 715 HII 01 34 22.73 +30 33 15.0           ~ 5 0
57 NGC 604 HII 01 34 32.1 +30 47 01           ~ 586 0
58 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1090 0
59 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2916 2
60 [MA42] 19 PoG ~ ~           ~ 2 0

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