WISH (Wide-field Infrared Surveyor for High-redshift) is a space science mission concept whose primary goal is to study the first galaxies in the early universe. WISH will be a Japan-led 1.5m telescope equipped with a 900 arcmin2 wide-field, Near-IR, 0.2-0.5arcsec FWHM, camera that would fly by ~2020 in order to conduct unique ultra-deep and wide-area sky surveys in the wavelength range 1-5 micron. A spectroscopic parallel-mode spectrograph (WISHSpec, Integral-Field Unit) in the same Near-IR range is also planned and would be studied in France under the responsibility of LAM. Although the instrument design is still open, with the parallel mode, we could envisage very deep exposure times in spectroscopy over (relatively) wide areas. Continua a leggere Joint WISH + First galaxies International Workshop
The formation of the first stars, black holes and galaxies is at the frontier of modern astrophysical research. Precision cosmology has revealed that we live in a flat Universe dominated by Dark Energy and Cold Dark Matter. Within this standard paradigm, structure formation proceeds hierarchically forming low mass objects first and subsequently building up larger galaxies all the way up to clusters of galaxies. While the growth of dark matter haloes is driven by gravity and well understood, the baryonic physics governing the formation and growth of stars, black holes and galaxies is more complex and requires the combination of different areas of physics covering such small scales as nuclei all the way up to parsec scale hydrodynamic instabilities. Continua a leggere The physics of first star and galaxy formation
Un gruppo di astronomi che si dedicano allo studio delle condizioni fisiche dell’Universo primordiale hanno ottenuto nuovi indizi sui processi di formazione delle prime strutture cosmiche, cioè stelle e galassie, andando ad analizzare la composizione chimica di alcune ‘stelle fossili’ che sono distribuite nelle regioni più esterne ed interne dell’alone galattico.
The aim of the workshop is to have focused discussions on the latest developments regarding our understanding of the formation and evolution of the first galaxies and structures in the Universe. We intend to centre our discussions on:
- Formation, growth and properties of the first galaxies
- The formation and growth of seed black holes and the impact of the associated feedback onto proto-galaxies
- Feedback from stars: chemical, mechanical and radiative; and how these regulate the growth of the first galaxies
- The role of reionization during the first billion years of galaxy evolution
The aim is to have broad reviews with topics ranging from observations to theoretical modelling, giving emphasis to the key questions observers and theorists are trying to answer, followed by talks focusing on specific topics in detail. We plan on having ample time for discussions in between the sessions.