21 cm cosmology in the 21st century.
نویسندگان
چکیده
Imaging the Universe during the first hundreds of millions of years remains one of the exciting challenges facing modern cosmology. Observations of the redshifted 21 cm line of atomic hydrogen offer the potential of opening a new window into this epoch. This will transform our understanding of the formation of the first stars and galaxies and of the thermal history of the Universe. A new generation of radio telescopes is being constructed for this purpose with the first results starting to trickle in. In this review, we detail the physics that governs the 21 cm signal and describe what might be learnt from upcoming observations. We also generalize our discussion to intensity mapping of other atomic and molecular lines.
منابع مشابه
To Have an Ethos Transplant, as It Were: Iranian Organizations in Washington DC in Early 21st Century
Based on eighteen months of ethnographic fieldwork from 2004 to 2006 among a range of Iranian organizations in Washington, D.C., this article argues that the studied organizations were engaged, without being always necessarily aware of it or formulating it as such, in what we may call an “ethos transplant:” a transformation of “Iranian character” and political culture to make it more susceptibl...
متن کاملElement of learning in 21st century from the Students' view points, in summer school of Shiraz University of Medical Sciences
Introduction: The aim of education process is learning and change in behavior which has been revolutionized in the 21st century due to the rapid changens in technology and sciences. The traditional approach to education does no longer meet the learners' needs, entailing new changes in educational curricula. This study was designed to determine the factors influencing learning in the 21st centur...
متن کامل16th century Persian tiles in dialogue with 21st century digital tiles in the Sadrian universe
This article brings together tiles of 16th century Persian architecture and 21st century digital tiles of moving image to explore new potentials beyond the perceived image. As minimal parts of a bigger image, they both appear still and motionless. However, Persian Islamic philosopher, Mulla Sadrā Shirazi’s (1571-1640) theory of ‘substantial motion’ (al-harakat a...
متن کاملMedical Education in 21st-century
Medical education play an important role in health of people in 20st-century, but this system has to change overtime. Medical education must respond to not only the demand of community at larg but also to changing in new technologies. Medical education have been criticized in last two decades of 20st-century, because of producing too many specialists focus on treatment instead of health, insuf...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Reports on progress in physics. Physical Society
دوره 75 8 شماره
صفحات -
تاریخ انتشار 2012