Abstract The Early Release Observations (EROs) of JWST beautifully demonstrate the
promise of JWST in characterizing the universe at Cosmic Dawn. We analyze the Near …

We study the gas phase metallicity (O/H) and nitrogen abundance gradients traced by star-
forming regions in a representative sample of 550 nearby galaxies in the stellar mass range …

In the context of observations of the rest-frame ultraviolet and optical emission from distant
galaxies, we explore the emission-line properties of photoionization models of active and …

H II region abundances - Model oxygen line ratios ADS Classic is now deprecated. It will be
completely retired in October 2019. This page will automatically redirect to the new ADS …

We have re-evaluated empirical expressions for the abundance determination of N, O, Ne,
S, Cl, Ar and Fe taking into account the latest atomic data and constructing an appropriate …

We present MMT spectroscopic observations of H ii regions in 42 low luminosity galaxies in
the Spitzer Local Volume Legacy survey. For 31 of the 42 galaxies in our sample, we were …

We present a detailed analysis of the spectroscopic catalog of galaxies in 10 distant clusters
from Dressler et al. We investigate the nature of the different spectral classes defined by …

We present a new model for computing consistently the line and continuum emission from
galaxies, based on a combination of recent population synthesis and photoionization codes …

Generally the gas metallicity in distant galaxies can only be inferred by using a few
prominent emission lines. Various theoretical models have been used to predict the …

We use high-quality spectrophotometric observations of 10 low-metallicity blue compact
galaxies (BCGs) with oxygen abundance ranging from 12+ log (O/H)= 7.37 to 8.04 to …