Ming Zhu FAST Science Group 2015-07-30. 2 2. General Technical Specification Spherical reflector ： Radius ～ 300m, Aperture ～ 500m, Opening angle 110~120°

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Presentation transcript:

Ming Zhu FAST Science Group

2 2. General Technical Specification Spherical reflector ： Radius ～ 300m, Aperture ～ 500m, Opening angle 110~120° Illuminated aperture ： D ill =300m Focal ratio ： f/D =0.467 Sky coverage ： zenith angle 40°(up to 60°with efficiency loss) tracking hours 0~6h Frequency ： 70M ~ 3 GHz （ up to 8GHz in future upgrading ） Sensitivity (L-Band) ： A/T~2000, T~20 K Resolution (L-Band) ： 2.9′ Multi-beam (L-Band) ： 19, beam number of future FPA >100 Slewing ： <10min Pointing accuracy ： 8″

3 In layout HI surveying EoR Pulsar VLBI 17 Lines SETI z~20 OH(4) H 2 CO(6) Water hole Space science S BandX Band First phase Second phase (GHz) 8 70MHz 4 HCOOH CH 3 OH HC 5 N(4)CH(4)CH 4 300MHz5.2GHz Frequency range C Band

4 Major Science Drives Neutral Hydrogen line (HI) survey Pulsar research VLBI network Molecular line study (including recombination lines, masers) Search for Extraterrestrial Intelligence (SETI)

5 Key HI projects with FAST HI proterties in the local universe and search for dark galaxies: all sky survey Cosmic Webs: Deep mapping of nearby spiral galaxies Mini halo search and missing satellite problems: HVCs and local group Galaxy Evolution, HI at high z

6 Sky coverage ZA 30 deg ZA 40 deg ZA 60 deg FAST Zenith Sky coverage FAST vs. Arecibo ZA 56 deg Opening angle - sky coverage

 Using a 19 beam L-band receiver to map 2.3π sterradians FAST sky at 40 sec per beam, doable in 1-2 yrs. ◦ Expect about 1 million detections (Duffy et al. 2008) with M HI < M  out to z ~ 0.15 in a range of environments including Coma, Hydra, Ursa Major, Persues-Pisces supercluster plus neighboring voids.

 Gas accreting onto galaxies  Tracing pass interactions  Mapping the cosmic web  Gas in void  Gas in groups and clusters, e.g. tails, filaments etc.

Dekel et al. Nature 457, (2009) Cold accretion streams in three dimensions.

The scale of the HI filaments is about 25kpc, corresponding to about 3 arcmin at a distance of 30 Mpc, so FAST can resolove many of the filamentray features. FAST Popping et al. 2009

Prochaska et al. 2010

Ibata and Lewis (2008) Sciences 319, 50

 To map a 4 square degree area, with an integration time of 10 minute per beam, in 10 hours we can reach a 3σ sensitivity of 1.5 x10 17 cm -2 per 2.1 km/s channel.  Select regions of different environments, ◦ void, big galaxies, clusters …

Arecibo ALFA Survey of NGC 2903 Judith A. Irwin et al Information: Thank you for downloading this PowerPoint slide from The Astrophysical Journal. This slide was designed to be edited; you can: - Remove components (including this text box!) - Resize components - Apply a style or theme - Please remember to include the original article citation information.

FAST is 10 times faster than Arecibo, and can map a 4 square degree area with an integration time of 10 minute per beam, in 10 hours we can reach a 3σ sensitivity of 1.5 x10 17 cm -2 per 2.1 km/s channel 200 fields of 2x2 square degree  2000 hrs

Courtesy of M. Haynes

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