Single Star Scidar first light from Dôme C

A Single Star SCIDAR system for Profiling Atmospheric Turbulence

This paper details a generalised SCIDAR system developed for characterising atmospheric parameters using single star targets. The instrument, which is based on a commercially available 250 mm diameter telescope, offers the potential for characterising atmospheric parameters for wide areas of the sky. Here, we describe the system and results of a proof of principle study performed at an observin...

Polarized Light from Star-forming Regions

o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o Studies f p larized radiati n fr m m lecular cl uds and the envir nments f pr t stars are pr viding inf rmati n ab ut the rientati ns and strengths f magnetic fields and the sizes and c mp siti ns f dust grains in these e...

First Star Clusters

Observations of the Lyα forest at z ∼ 3 reveal a metallicity Z ∼ 10 −2 Z ⊙. The high-redshift supernovae that polluted the IGM also accelerated relativistic electrons. Since the energy density of the CMB ∝ (1 + z) 4 , at high redshift these electrons cool via inverse Compton scattering. Thus, the first star clusters emit X-rays. Unlike stellar UV ionizing photons, these X-rays can escape easily...

Stereo-SCIDAR: optical turbulence profiling with high sensitivity using a modified SCIDAR instrument

The next generation of adaptive optics systems will require tomographic reconstruction techniques to map the optical refractive index fluctuations, generated by the atmospheric turbulence, along the line of sight to the astronomical target. These systems can be enhanced with data from an external atmospheric profiler. This is important for Extremely Large Telescope scale tomography. Here we pro...

FIRSt-LIGHt IMAGERY FROM SUOMI NPP VIIRS