Chemical distribution of H II regions towards the Galactic anticentre

Home

All issues

Volume 597 (January 2017)

A&A, 597 (2017) A84

Full HTML

Free Access

Table 7

Chemical abundance gradients derived by other authors in studies with Galactic H ii regions.

Reference	Spectral range	R_G range (kpc)	O/H	N/H	S/H	N/O

Shaver et al. (1983)	radio+optical	3.5−13.7	−0.07	−0.09	−0.01	−
Simpson et al. (1995)	radio+infrared	0.1−10.2	−	−0.10	−0.07	−0.04
Vílchez & Esteban (1996)^a	optical	12.4−18.0	−0.028/−0.036/−0.051	0.043/−0.009/0.002	−0.01/−0.041/−0.013	−
Afflerbach et al. (1997)	radio+infrared	0−11.4	−0.064	−0.072	−0.063	−
Rudolph et al. (1997)	radio+infrared	12.9−17.0	−	−0.111	−0.079	−
Deharveng et al. (2000)^b	optical	6.5−17.7	−0.0473/−0.0395	−	−	−
Esteban et al. (2005) ^c	optical (RLs)	6.3−10.4	−0.044	−	−	−
Quireza et al. (2006)	radio	0.1−16.9	−0.043	−	−	−
Rudolph et al. (2006) ^d	radio+infrared	0−18	−0.060/−0.041	−0.071/−0.085	−0.046/−0.042	+0.004/−0.034
Balser et al. (2011) ^e	radio	4.7−21.9	−0.0383/−0.0446	−	−	−
This work ^[f]	optical	11−18	−0.053/−0.061	−0.080/−0.085	−0.106/−0.108	−0.041/−0.047

Notes. We show the slope, d(log(X/H))/dR_G, for each element X in units of dex kpc^-1.

^(a)

Abundances derived from direct t_e./Abundances derived from model-dependent methods./All the estimations.

^(b)

Completed sample./Regions with direct t_e.

^(c)

Chemical abundances derived from recombination lines (RLs) with t² ≠ 0.

^(d)

Optical data./Far infrared data.

^(e)

GBT sample./Green Bank sample.

^(f)

All data (three methods)./Only direct abundances.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.