2021MNRAS.502.3045K

Query : 2021MNRAS.502.3045K

2021MNRAS.502.3045K - Mon. Not. R. Astron. Soc., 502, 3045-3056 (2021/April-1)

A new determination of the primordial helium abundance using the analyses of H II region spectra from SDSS.

KURICHIN O.A., KISLITSYN P.A., KLIMENKO V.V., BALASHEV S.A. and IVANCHIK A.V.

Abstract (from CDS):

The precision measurement of the primordial helium abundance Yp is a powerful probe of the early Universe. The most common way to determine Yp is the analyses of observations of metal-poor H II regions found in blue compact dwarf galaxies. We present the spectroscopic sample of 100 H II regions collected from the Sloan Digital Sky Survey. The final analysed sample consists of our sample and HeBCD data base from Izotov et al. (2007). We use a self-consistent procedure to determine physical conditions, current helium abundances, and metallicities of the H II regions. From a regression to zero metallicity, we have obtained Yp = 0.2462 ± 0.0022, which is one of the most stringent constraints obtained with such methods up to date and is in a good agreement with the Planck result Y_ p_^Planck^ = 0.2471 ±0.0003. Using the determined value of Yp and the primordial deuterium abundance taken from Particle Data Group (Zyla et al. 2020) we put a constraint on the effective number of neutrino species Neff = 2.95 ± 0.16, which is consistent with the Planck one Neff = 2.99 ± 0.17. Further increase of statistics potentially allows us to achieve Planck accuracy, which in turn will become a powerful tool for studying the self-consistency of the standard cosmological model and/or physics beyond.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): galaxies: abundances - galaxies: starburst - cosmological parameters - early Universe - primordial nucleosynthesis

CDS comments: The objects from Table 2 are not in SIMBAD (not enough information). HS 1700+5416 is a misprint for HS 1700+6416.

Simbad objects: 21

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Number of rows : 21
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 NGC 346 Cl* 00 59 04.4000 -72 10 39.000           ~ 547 0
2 NGC 450 H2G 01 15 30.4565036568 -00 51 39.125259576   13.4   13.3 13.2 ~ 240 0
3 SBSG 0335-052B G 03 37 44.04 -05 02 40.2   16.77 16.65   16.79 ~ 220 1
4 [GPM2009] J0519+0007 G 05 19 02.6953532514 +00 07 29.106797166           ~ 23 0
5 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 588 3
6 Mrk 116B EmG 09 34 02.389 +55 14 23.14           ~ 62 0
7 Z 7-25 Sy1 09 44 01.8742171440 -00 38 31.993352700   15.5       ~ 89 0
8 LEDA 27886 QSO 09 44 17.101 +54 11 28.83   19.5       ~ 72 0
9 Mrk 1434 SBG 10 34 10.155 +58 03 49.13   16.5   16.54   ~ 80 0
10 Mrk 1450 AGN 11 38 35.6552554896 +57 52 26.636623644   15.5       ~ 130 1
11 Mrk 193 H2G 11 55 28.34 +57 39 52.0   16.5       ~ 63 0
12 Mrk 1315 H2G 12 15 18.5915257128 +20 38 26.666992356   16.5       ~ 57 0
13 LEDA 39402 AGN 12 17 17.093 -28 02 32.67   17       ~ 143 0
14 LEDA 2816013 AG? 12 25 05.438 +61 09 09.72   17.0       ~ 49 0
15 ESO 380-27 AGN 12 25 46.95 -36 14 00.7   17.47   16.52   ~ 104 1
16 Z 244-18 bCG 12 26 15.69 +48 29 38.3   15.3       ~ 364 0
17 IC 3591 bCG 12 37 02.697 +06 55 33.26   14.6       ~ 137 1
18 Mrk 59 rG 12 59 00.288 +34 50 42.45           ~ 319 2
19 Z 189-45 H2G 13 14 48.796 +34 52 53.18   14.9       ~ 89 0
20 Z 219-66 QSO 14 17 01.716 +43 30 13.52   15.6       ~ 181 0
21 HS 1700+6416 QSO 17 01 00.6194059368 +64 12 09.118892376   16.39 16.17     ~ 382 0

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