SKA Working Group 4 Level-1 Science: HI surveys / LSS

Sensitive wide-field HI survey to measure evolution in gas and dark-matter mass function of galaxies, to study LSS, and to constrain structure formation models and cosmological parameters.

Additional notes: WG4 Bologna ; WG4 pre-Groningen ; WG4 post-Groningen .

SKA Designs (requirements matrix)

Red=All agreed that it fails; Dark Blue=some say it fails; Pink=most say it fails.
*Specification*	*Requirement*	*China*	*Europe*	*India*	*Ozlens*	*Ozcyli*	*USA*	*Canada*
A/Tsys	20000	35000	10500	20000	20000	20000	20000	20000
FOV (deg2)	1	0.005	1	1	3.6	1 (8)	1	1 (FPA)
#beams	1	1	8	1	2	8 (64)	1	350
beam separation			90		150	40x1		1
#subarrays		few	many	many	many	many	many	few?
response time		100	<1	60	60	60	60	100
Freq range	0.3-1.8	0.3-6.0	0.15-1.5	0.15-10.0	0.1-5.0	0.10-9.0	0.15-34.0	0.1-22.0
Corr Bandwith			0.2		3.0	2.4	3.2	4
#spectral channels			2x4096		2x4096	2x4096	16384
sampling time							short
max baseline	100	300	2000		3000	10000	5000
50% area baseline	30	50	100		4	3	35
Tb sensitivity	1		1	1	0.7		1
#independent IFs			3		4		4	4
Max sep. of IFs			1				full band	full band
Spatial DNR		1e+05		1e+06		1e+06	1e+06	1e+06
Spectral DNR	1e+05
Polarization DNR				1e+04			1e+04
#spatial pixels				1e+08		1e+08	5e+10