HIPark – a parked Parkes survey Goals: ultra sensitive to low column densities How sensitive ? … optically thin at the Lyman limit exercise in observational.

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Presentation transcript:

HIPark – a parked Parkes survey Goals: ultra sensitive to low column densities How sensitive ? … optically thin at the Lyman limit exercise in observational techniques … rfi, passband calibration, … good match to long maintenance periods diffuse clouds in LG & Milky Way halo

HI Park proposers… Briggs Barnes de Blok Freeman Gibson Korbalski Reynolds Staveley-Smith Zwaan HI Park progress ? Pilot sessions: June 2001, Dec 01/Jan 02 RIGHT NOW !!! maintenance period to overhaul Alt-drive using 16 MHz filters  3380  v= 3km/s res

Quasar Absorption lines Lyman  forest DLA Metal lines Wavelength (Angstroms)

Quasar Absorption lines Lyman  forest DLA Metal lines LL

Quasar Absorption lines  thoroughly developed statistics !!! for metal lines…

C IV M gII / Lyman limit (CII, FeII, SiII, …) Relative interception cross sections … Z=3 Ly break galaxyDLA

HI Column density distribution function Petijean etal 1993 Log f (N HI ) Log N HI Number of interceptions in range: N to N+dN f (N) dN /unit Z N HI = N H (n HI / n H ) Ionization fraction ~10 -3 ? Ly  forest IGM DLA C IV  LL > 1

This Week at Parkes

Sensitivity: to achieve 6  < 3 x cm -2 need ~ 6 hours of integration per beam Drift scan: 15’ beam transits in ~ 1 minute  ~360 transits

Barnes et al Multibeam !!!

1x1x 4x4x 3x3x Feed orientation for drift scans

Path of Survey Strip: Galactic Coords Limits on tiny masses in Sculptor… 3x10 4 d Mpc 2 solar masses D cloud >1 kpc at 250 kpc … to fill beam

Magellanic Stream (Putman et al)

Sculptor (Putman et al)

Path of Survey Strip: Galactic Coords

Right Ascension Velocity One Day – One Beam

RA Velocity km/s Galactic Plane crossing: L ~ 250 o

RA Velocity

RA Velocity

RA Velocity

RA Velocity Sun up !

T obs (f) = [ g 1 (f)T antenna (f) + T rec (f) ] g 2 (f) Receiver (Preamps etc) Spectrometer (Filters etc) T antenna (f) T receiver (f) (dominant noise) T obs (f) T ant (f) = [ T obs (f)/ g 2 (f) - T rec (f) ]/ g 1 (f) g 1 (f) g 2 (f) g3g3 Sun GALACTIC PLANE, g 4 Ground g 5

TIME (steps) Pilot run June 01: total power versus time Note erratic tot-pwr in Rx-5

passband calibrated continuum subtracted Dynamic Spectra: one receiver Frequency (64 MHz bandwidth) Time (vertical)

1x1x 4x4x 3x3x Pilot Dec01/Jan02 8 MHz Bandwidth

DEEP Centaurus Survey (Disney et al)