Ricardo Chávez

HIGHEST REDSHIFT IMAGE of NEUTRAL HYDROGEN in EMISSION: A CHILES DETECTION of A STARBURSTING GALAXY at z = 0.376

Our current understanding of galaxy evolution still has many uncertainties associated with the details of accretion, processing, and removal of gas across cosmic time. The next generation of radio telescopes will image the neutral hydrogen (HI) in galaxies over large volumes at high redshifts, which will provide key insights into these processes. We are conducting the COSMOS HI Large Extragalactic Survey (CHILES) with the Karl G. Jansky Very Large Array, which is the first survey to simultaneously observe HI from z=0 to z~0.5. Here, we report the highest redshift HI 21-cm detection in emission to date of the luminous infrared galaxy (LIRG) COSMOS J100054.83+023126.2 at z=0.376 with the first 178 hours of CHILES data. The total HI mass is

On the road to precision cosmology with high-redshift H II galaxies

(2.9\pm1.0)\times10^{10}~M_\odot

Constraining the Dark Energy Equation of State with HII Galaxies

, and the spatial distribution is asymmetric and extends beyond the galaxy. While optically the galaxy looks undisturbed, the HI distribution suggests an interaction with candidate a candidate companion. In addition, we present follow-up Large Millimeter Telescope CO observations that show it is rich in molecular hydrogen, with a range of possible masses of

The Environment of HII Galaxies revisited

(1.8-9.9)\times10^{10}~M_\odot

The L−σ relation for HII galaxies in green

. This is the first study of the HI and CO in emission for a single galaxy beyond z~0.2.

Direct measurement of lensing amplification in Abell S1063 using a strongly lensed high redshift HII galaxy

We report the first results of a programme aimed at studying the properties of high redshift galaxies with on-going massive and dominant episodes of star formation (HII galaxies). We use the

From Giant H ii regions and H ii galaxies to globular clusters and compact dwarf ellipticals

L(\mathrm{H}\beta) - \sigma

Determining the Hubble constant using giant extragalactic H ii regions and H ii galaxies

distance estimator based on the correlation between the ionized gas velocity dispersions and Balmer emission line luminosities of HII galaxies and Giant HII regions to trace the expansion of the Universe up to

The L–σ relation for massive bursts of star formation

z \sim 2.33

A Strategy to Measure the Dark Energy Equation of State using the HII galaxy Hubble Function & X-ray AGN Clustering: Preliminary Results.

. This approach provides an independent constraint on the equation of state of dark energy and its possible evolution with look-back time. Here we present high-dispersion (8,000 to 10,000 resolution) spectroscopy of HII galaxies at redshifts between 0.6 and 2.33, obtained at the VLT using XShooter. Using six of these HII galaxies we obtain broad constraints on the plane