2006ApJ...646..691F

Query : 2006ApJ...646..691F

2006ApJ...646..691F - Astrophys. J., 646, 691-695 (2006/August-1)

Primordial helium abundance: a reanalysis of the Izotov-Thuan spectroscopic sample.

FUKUGITA M. and KAWASAKI M.

Abstract (from CDS):

A reanalysis is made for the helium abundance determination for the Izotov-Thuan spectroscopic sample of extragalactic H II regions. We find that the effect of underlying stellar absorption of the He I lines, which is more important for metal-poor systems, affects significantly the inferred primordial helium abundance Yp obtained in the zero-metallicity limit and the slope of linear extrapolation, dY/dZ. This brings Yp from 0.234±0.004 to 0.250±0.004 and dY/dZ=4.7±1.0 to 1.1±1.4. Conservatively, this indicates the importance of the proper understanding of underlying stellar absorption for accurate determinations of the primordial helium abundance to the error of δYp≃0.002-0.004.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Abundances - ISM: H II Regions - ISM: Abundances

Simbad objects: 31

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Number of rows : 31
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 GALEXASC J000210.08+171557.3 bCG 00 02 09.90 +17 15 59.0           ~ 11 0
2 LEDA 1549 H2G 00 24 42.35 +01 44 01.7 16.58 16.91 16.51 16.21 15.89 ~ 30 0
3 LEDA 101433 AG? 00 32 03.11 +18 04 46.1           ~ 15 0
4 NGC 346 Cl* 00 59 04.4000 -72 10 39.000           ~ 547 0
5 LEDA 101449 bCG 01 14 37.59 +21 31 17.7           ~ 12 0
6 Z 411-56 H2G 01 25 34.1903008704 +07 59 24.703412028   15.6       ~ 49 0
7 GALEXASC J013121.37+284812.1 bCG 01 31 21.30 +28 48 12.0           ~ 12 0
8 HS 0134+3415 bCG 01 37 13.8 +34 31 12           ~ 8 0
9 Z 412-24 H2G 01 44 41.3 +04 53 26 15.07 15.50 15.16 14.86 14.58 ~ 106 0
10 LEDA 8099 EmG 02 07 26.48 +02 56 55.2   18       ~ 27 0
11 NGC 1140 AGN 02 54 33.5271666624 -10 01 43.142143908 12.41 12.84 12.49 13.6 13.5 ~ 303 1
12 [GPM2009] J0519+0007 G 05 19 02.6953532514 +00 07 29.106797166           ~ 23 0
13 LEDA 2790875 EmG 07 38 58.4 +35 05 36   17.6       ~ 7 0
14 SHOC 193b EmG 08 14 47.5388458368 +49 04 00.695425440   18.6       ~ 10 0
15 US 1442 Sy1 08 40 29.9112912216 +47 07 10.241384412   18.2       ~ 68 0
16 HS 0924+3821 EmG 09 28 06.23651 +38 07 57.0548   18.5       ~ 15 0
17 Z 7-25 Sy1 09 44 01.8742171440 -00 38 31.993352700   15.5       ~ 89 0
18 Mrk 1236 H2G 09 49 54.12 +00 36 58.5           ~ 37 0
19 HS 1028+3843 EmG 10 31 51.6330188208 +38 28 08.373160020   19.40       ~ 10 0
20 Mrk 724 EmG 10 41 09.5920692336 +21 21 42.776300700   16.5       ~ 40 0
21 NGC 3353 AGN 10 45 22.390 +55 57 37.36 12.90 13.25 12.79     ~ 378 1
22 Z 12-40 EmG 11 36 36.636 +00 49 02.61   15.3   14.518 15.1 ~ 124 0
23 MCG-03-31-006 EmG 11 58 58.114 -19 01 47.67   14.19 17.8 13.41 14.4 ~ 91 0
24 Mrk 1315 H2G 12 15 18.5915257128 +20 38 26.666992356   16.5       ~ 57 0
25 HS 1214+3801 EmG 12 17 09.6997171584 +37 44 53.897601156   16.5       ~ 11 0
26 IC 3591 bCG 12 37 02.697 +06 55 33.26   14.6       ~ 137 1
27 UM 522 EmO 12 53 27.6 +01 15 57   18       ~ 2 0
28 Z 189-42 GiP 13 13 17.60 +36 13 03.0   13.73   12.96   ~ 91 1
29 Z 189-45 H2G 13 14 48.796 +34 52 53.18   14.9       ~ 89 0
30 Mrk 67 EmG 13 41 56.4808997304 +30 31 09.652262088   16.5       ~ 96 0
31 HS 2236+1344 bCG 22 38 31.1192205216 +14 00 29.770282476           ~ 38 0

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