Combining galaxy and 21-cm surveys
نویسندگان
چکیده
منابع مشابه
The Cross-correlation of High-redshift 21 Cm and Galaxy Surveys
We study the detectability of the cross-correlation between 21 cm emission from the intergalactic medium and the galaxy distribution during (and before) reionization. We show that first-generation 21 cm experiments, such as the Mileura Widefield Array (MWA), can measure the cross-correlation to a precision of several percent on scales k ∼ 0.1 Mpc if combined with a deep galaxy survey detecting ...
متن کاملLocal benchmarks for SKA HI 21-cm surveys
One of the obvious tasks for the Square Kilometer Array is to perform deep neutral hydrogen 21-cm emission line surveys out to large redshifts. For the planning of these surveys, and for the interpretation of the results, it is important to have solid z = 0 benchmarks. This paper summarizes some of the results of local extragalactic 21-cm surveys and their implications on the interpretation of ...
متن کامل21-cm Synthesis Observations of Virgohi 21 - a Possible Dark Galaxy in the Virgo Cluster
Many observations indicate that dark matter dominates the extra-galactic Universe, yet no totally dark structure of galactic proportions has ever been convincingly identified. Previously we have suggested that VIRGOHI 21, a 21-cm source we found in the Virgo Cluster using Jodrell Bank, was a possible dark galaxy because of its broad line-width (∼ 200 km s−1) unaccompanied by any visible gravita...
متن کاملThe existence and detection of optically dark galaxies by 21 cm surveys
One explanation for the disparity between Cold Dark Matter (CDM) predictions of galaxy numbers and observations could be that there are numerous dark galaxies in the Universe. These galaxies may still contain baryons, but no stars, and may be detectable in the 21cm line of atomic hydrogen. The results of surveys for such objects, and simulations that do/do not predict their existence, are contr...
متن کاملHigh redshift galaxy surveys
A brief overview on the current status of the census of the early universe population is given. Observational surveys of high redshift galaxies provide direct opportunities to witness the cosmic dawn and to have better understanding of how and when infant galaxies evolve into mature ones. It is a much more astronomical approach in contrast to the physical approach of to study the spatial fluctu...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2016
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/stw108