Inferring the HII region escape fraction of ionizing photons from infrared emission lines in metal-poor star-forming dwarf galaxies

Infrared Properties of Star Forming Dwarf Galaxies : II . Blue Compact Dwarf Galaxies in the Virgo Cluster

A sample of 16 blue compact dwarf galaxies (BCDs) in the Virgo Cluster has been imaged in the near-infrared (NIR) in J and K s on the 2.1m telescope at OAN-SPM in Mexico. Isophotes as faint as µ J = 24 mag arcsec −2 and µ Ks = 23 mag arcsec −2 have been reached in most of the targets. Surface brightness profiles can be fitted across the whole range of radii by the sum of two components: a hyper...

Star-forming Dwarf Galaxies: Ariadne’s Thread in the Cosmic Labyrinth Star Formation in Hii Galaxies. Properties of the ionized gas

We present two set of high signal-to-noise spectrophotometric observations of three and seven compact and luminous Hii galaxies observed with the WHT and the 3.5 m telescope at CAHA, respectively. All the observations have been made with the use of a double-arm spectrograph which provides spectra with a wide wavelength coverage, from 3200 to 10500 Åfor the WHT data and 3400 to 10400 Åfor the CA...

Ionizing Photon Escape Fractions from High Redshift Dwarf Galaxies

It has been argued that low-luminosity dwarf galaxies are the dominant source of ionizing radiation during cosmological reionization. The fraction of ionizing radiation that escapes into the intergalactic medium from dwarf galaxies with masses less than ∼10 solar masses plays a critical role during this epoch. Using an extensive suite of very high resolution (0.1 pc), adaptive mesh refinement, ...

X-ray emission from star-forming galaxies

Forming a Primordial Star in a Relic Hii Region

There has been considerable theoretical debate over whether photoionization and supernova feedback from the first Population III stars facilitate or suppress the formation of the next generation of stars. We present results from an Eulerian adaptive mesh refinement simulation demonstrating the formation of a primordial star within a region ionized by an earlier nearby star. Despite the higher t...