English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We have performed a comprehensive multiwavelength analysis of a sample of 20starburst galaxies that show a substantial population of very young massivestars, most of them classified as Wolf-Rayet (WR) galaxies. We have analysedoptical/NIR colours, physical and chemical properties of the ionized gas,stellar, gas and dust content, star-formation rate and interaction degree(among many other galaxy properties) of our galaxy sample usingmulti-wavelength data. We compile 41 independent star-forming regions --withoxygen abundances between 12+log(O/H) = 7.58 and 8.75--, of which 31 have adirect estimate of the electron temperature of the ionized gas. This paper,only submitted to astro-ph, compiles the most common empirical calibrations tothe oxygen abundance, and presents the comparison between the chemicalabundances derived in these galaxies using the direct method with thoseobtained through empirical calibrations, as it is published in Lopez-Sanchez &Esteban (2010b). We find that (i) the Pilyugin method (Pilyugin 2001a,b;Pilyugin & Thuan 2005) which considers the R23 and the P parameters, is thebest suited empirical calibration for these star-forming galaxies, (ii) therelations between the oxygen abundance and the N2 or the O3N2 parametersprovided by Pettini & Pagel (2004) give acceptable results for objects with12+log(O/H)>8.0, and (iii) the results provided by empirical calibrations basedon photoionization models (McGaugh, 1991; Kewley & Dopita, 2002; Kobulnicky &Kewley, 2004) are systematically 0.2 -- 0.3 dex higher than the values derivedfrom the direct method. These differences are of the same order that theabundance discrepancy found between recombination and collisionally excitedlines. This may suggest the existence of temperature fluctuations in theionized gas, as exists in Galactic and other extragalactic HII regions.

Massive star formation in Wolf-Rayet galaxies: IV b. Using empirical calibrations to compute the oxygen abundance