2009ApJ...700..654E


Query : 2009ApJ...700..654E

2009ApJ...700..654E - Astrophys. J., 700, 654-678 (2009/July-3)

Keck HIRES spectroscopy of extragalactic H II regions: C and O abundances from recombination lines.

ESTEBAN C., BRESOLIN F., PEIMBERT M., GARCIA-ROJAS J., PEIMBERT A. and MESA-DELGADO A.

Abstract (from CDS):

We present very deep spectrophotometry of 14 bright extragalactic H II regions belonging to spiral, irregular, and blue compact galaxies. The data for 13 objects were taken with the High Resolution Echelle Spectrometer on the Keck I telescope. We have measured C II recombination lines in 10 of the objects and O II recombination lines in eight of them. We have determined electron temperatures from line ratios of several ions, especially those of low ionization potential. We have found a rather tight linear empirical relation between Te([N II]) and Te([O III]). We have found that O II lines give always larger abundances than [O III] lines. Moreover, the difference of both O++ abundance determinations–the so-called abundance discrepancy factor–is very similar in all the objects, with a mean value of 0.26±0.09 dex, independent of the properties of the H II region and of the parent galaxy. Using the observed recombination lines, we have determined the O, C, and C/O radial abundance gradients for three spiral galaxies: M33, M101, and NGC 2403, finding that C abundance gradients are always steeper than those of O, producing negative C/O gradients across the galactic disks. This result is similar to that found in the Milky Way and has important implications for chemical evolution models and the nucleosynthesis of C.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: individual (M31, M33, M83, M101, NGC 1741, NGC 2366, NGC 2403, NGC 4395, NGC 4861) - galaxies: ISM - galaxies: spiral - H II regions

VizieR on-line data: <Available at CDS (J/ApJ/700/654): sources.dat tab234.dat>

CDS comments: K932 is [WB92a] 932 and H1013 is HGGK 1013 in Simbad.

Simbad objects: 35

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Number of rows : 35
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12039 1
2 BA 1-671 HII 00 46 34.52 +42 11 33.7           ~ 21 1
3 NGC 595 HII 01 33 33.53 +30 41 29.8           ~ 199 0
4 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5578 1
5 NGC 604 HII 01 34 32.1 +30 47 01           ~ 573 0
6 2MASX J05013782-0415294 G 05 01 37.832 -04 15 28.48   13.44   12.76   ~ 69 1
7 NGC 1741 IG 05 01 38.3 -04 15 25   13.7   13.02 13.6 ~ 253 0
8 M 42 HII 05 35 01.5 -05 26 24           ~ 3955 0
9 RMC 136 Cl* 05 38 42.396 -69 06 03.36           ~ 1900 1
10 NGC 2363 G 07 28 29.83 +69 11 32.8   15.5       ~ 253 1
11 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 554 3
12 NGC 2366 H2G 07 28 51.85 +69 12 31.1 12.25 11.86 11.39 11.33   ~ 737 0
13 CXOU J073645.6+653659 HII 07 36 45.6 +65 36 59           ~ 24 0
14 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1717 1
15 HK NGC 2403 270 Cl* 07 36 52.13 +65 36 48.5           ~ 22 0
16 [S75b] NGC 2403 2 HII 07 37 06.82 +65 36 38.7           ~ 38 0
17 Feige 34 HS* 10 39 36.7358839104 +43 06 09.212615280 9.613 10.91 11.14 11.319 11.464 sdOp 651 0
18 NGC 4395 Sy2 12 25 48.8633109888 +33 32 48.700168152 10.84 10.54 10.11 9.98   ~ 1101 1
19 [CC2002] NGC 4395 70 HII 12 25 57.8 +33 31 39           ~ 4 0
20 BD+25 2534 HS* 12 37 23.5161671712 +25 03 59.867922240 9.117 10.26 10.59 10.642 10.809 sdB1(k) 228 0
21 Mrk 59 AGN 12 59 00.288 +34 50 42.45           ~ 312 2
22 NGC 4861 H2G 12 59 02.340 +34 51 33.98   12.90 12.32     ~ 370 2
23 M 83 SBG 13 37 00.91920 -29 51 56.7400 8.85 8.11 7.52 7.21   ~ 2440 2
24 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1321 4
25 NGC 5447 HII 14 02 28.0 +54 16 34           ~ 69 0
26 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2753 2
27 [H69] NGC 5457 40 PoG 14 03 31.300 +54 21 05.81           ~ 40 0
28 NGC 5461 HII 14 03 40.96 +54 19 02.4           ~ 180 0
29 NGC 5471 EmG 14 04 28.627 +54 23 52.84           ~ 236 1
30 BD+33 2624 PM* 15 42 52.1034672336 +32 43 14.711967912   11.49 10.81 10.572   ~ 2 0
31 HD 338808 HS* 19 44 26.1391859472 +26 13 16.683280608 10.92 11.03 10.47     sdB0.5VIpHe9 93 0
32 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1507 0
33 BD+28 4211 HS* 21 51 11.0221915656 +28 51 50.367627468 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 773 0
34 BD+25 4655 HS* 21 59 41.9748629928 +26 25 57.403455672 8.27 9.39 9.68     sdO6 109 0
35 Feige 110 HS* 23 19 58.3996844256 -05 09 56.171142864 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 608 1

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2022.12.10-07:37:32

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