What good are low frequencies? HI, neutral hydrogen, H 0, atomic hydrogen high redshifts and early times…. USS, GPS, … “enabling technologies” …multi-beaming,

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Presentation transcript:

what good are low frequencies? HI, neutral hydrogen, H 0, atomic hydrogen high redshifts and early times…. USS, GPS, … “enabling technologies” …multi-beaming, all-sky transients,…, the highest energy cosmic rays…

FREQ. GHz FREQ MHz Z = 4 Gigahertz Peak Sources: young radio sources ???

.…. ionized…… re-re-ionized re-ionized Big Bang Nucleosynthesis

HI HI HI HI HI 70 MHz ………………..180 MHz

damped Lyman-  abs-lines 21cm Line Studies (HIPASS)

CosmicEvolutionIndicators Redshift co-moving number density of bright Quasars Cosmic Star Formation Rate history: the Madau Plot extent of metal-rich gaseous halos cosmic density  g of Neutral Gas

Violent accretion accretion Passive relaxation relaxation CosmicEvolutionIndicators Redshift MHz frequency

3C196- G1 z = HST image (Ridgway & Stockton) 3” Cohen et al

Double Lobed Radio Source Radio spectrum at 988 MHz Westerbork (Briggs, deBruyn, Vermeulen) 300 km/s

source centroid as fnct of Frequency map emission ? SKA map absorption ?

new GMRT Kanekar & Chengalur 988 MHz

high redshift radio galaxies TNR J TNR J

Radio galaxy spectra No UV continuum No DLA absorption lines

Molonglo Telescope: SKAMP III frequency coverage sensitivity RFI rejection VLBI to resolve source

the Molonglo challenges: broadband line feeds 96 station correlator Defence HQ 3 km away ?!?!