Future HI Surveys on the road to the SKA
| dc.creator | Braun, Robert | |
| dc.date | 2007-03-29 | |
| dc.date.accessioned | 2026-07-07T07:54:35Z | |
| dc.date.available | 2026-07-07T07:54:35Z | |
| dc.description | In this short contribution we consider what types of surveys might be optimally pursued with path-finding instruments of 1%, 10% and finally 100% of the projected SKA sensitivity from the perspective of scientific applications that utilize the red-shifted 21 cm emission line. Achieving interesting HI galaxy sample sizes with 1% SKA surveys requires very substantial survey durations, of about 1000 days. Good sampling (log(N)~5) down to below M_HI* can then be achieved out to z=0.2 over 8000 deg^2 of survey area or even to z=0.5 over 800 deg^2. The same surveys will permit the resolved imaging of order 1000 galaxies in each of several red-shift bins as well as detection of faint neutral filaments in the vicinity of galaxies with a column density of about 10^18 cm^-2. Once 10% SKA sensitivities are achieved, then ground-breaking surveys are possible with only 100 day duration. Sample sizes of log(N)~6 extending below M_HI* are possible over 800 deg^2 out to z=0.5 and over 80 deg^2 out to z=1. Such surveys will permit very competitive measurement of acoustic oscillations in the galaxy power spectrum. One can then envision a series of 10% SKA surveys probing different depths. With the 100% SKA sensitivity the capabilities are truly phenomenal. Survey sample sizes in the range log(N)=7-8 are feasible over the red-shift range of 0.2 to about 5. Precise tracking of potential time evolution of dark energy (via the baryonic acoustic oscillation signature) should be possible out to z~3. The local cosmic web will be imaged down to N_HI=10^16 cm^-2. What exactly will be seen at z > 3 ? This will depend crucially on the SKA sensitivity in the critical frequency window of 350 to 200 MHz. | |
| dc.description | To appear in "Cosmology, Galaxy Formation and Astroparticle Physics on the Pathway to the SKA", Eds. Kloekner, Jarvis, Rawlings. Submitted 1 Aug. 2006 | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0703746 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0703746 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/126670 | |
| dc.subject | Astrophysics | |
| dc.title | Future HI Surveys on the road to the SKA | |
| dc.type | text |