We review the use of emission lines for understanding galaxy evolution, focusing on
excitation source, metallicity, ionization parameter, ISM pressure, and electron density. We …

The evolution of the content of heavy elements in galaxies, the relative chemical
abundances, their spatial distribution, and how these scale with various galactic properties …

Hydrogen Lyman-α (Lyα) emission has been one of the major observational probes for the
high-redshift Universe since the first discoveries of high-z Lyα-emitting galaxies in the late …

Using observations from the MOSFIRE Deep Evolution Field survey, we investigate the
physical conditions of star-forming regions in z∼ 2.3 galaxies, specifically the electron …

We use the chemical evolution predictions of cosmological hydrodynamic simulations with
our latest theoretical stellar population synthesis, photoionization, and shock models to …

Faint Lyα emitters become increasingly rarer toward the reionization epoch (z∼ 6–7).
However, observations from a very large (∼ 5 deg 2) Lyα narrow-band survey at z= 6.6 …

We present a systematic study for ionization state of inter-stellar medium in galaxies at z= 0–
with∼ 140 000 Sloan Digital Sky Survey (SDSS) galaxies and 108 intermediate-to high …

We present results on the excitation properties of z∼ 2.3 galaxies using early observations
from the MOSFIRE Deep Evolution Field (MOSDEF) Survey. With its coverage of the full …

We perform joint modeling of the composite rest-frame far-UV and optical spectra of redshift
1.85≤ z≤ 3.49 star-forming galaxies to deduce key properties of the massive stars, ionized …

We examine the factors responsible for the variation in the ionization parameter (U) of high-
redshift star-forming galaxies based on medium-resolution JWST/NIRSpec observations …