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A llen A rray T elescope Low Hanging Fruit in The New Radio Sky or Radio Surveys and Transients with the Allen Telescope Array or The Same Road Twice Geoffrey.

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Presentation on theme: "A llen A rray T elescope Low Hanging Fruit in The New Radio Sky or Radio Surveys and Transients with the Allen Telescope Array or The Same Road Twice Geoffrey."— Presentation transcript:

1 A llen A rray T elescope Low Hanging Fruit in The New Radio Sky or Radio Surveys and Transients with the Allen Telescope Array or The Same Road Twice Geoffrey Bower, UC Berkeley

2 A llen A rray T elescope ATA-42 Operational Soon

3 A llen A rray T elescope

4 A llen A rray T elescope ATA FiGSS Five GHz Sky Survey 5 GHz Counterpart to Sloan Digital Sky Survey –Overlap with NVSS, FIRST & SDSS –10 4 Square degrees –Arcminute resolution Highest Frequency Deep, Large Radio Survey –0.6 mJy rms –Factor of ~10 more sensitive than GB6 –2 Smaller, deeper fields 6 calendar months to complete with ATA-42 Extendable in area and sensitivity

5 A llen A rray T elescope FiGSS Science Detect 250,000 Sources Cross with NVSS: 1.4-5 GHz Spectral Indices –Separate star burst galaxies from AGN –Arp 220 detectable to z=0.16 (0.3, 0.5) Cross with SDSS, SWIRE, COSMOS –Galaxy evolution –Obscured star-formation and AGN science –AGN activity census –Radio continuum-star formation relations Polarization & Rotation Measure (10 3 --10 6 rad m -2 ) for all objects –Identify hidden or depolarized nonthermal sources: jets, SNe remnants –Dense probe of ISM B-field Galactic foregrounds for CMB and EOR Community property –Virtual Observatory catalog Survey sample lists NVSS+FIRST produced more than 1000 refereed citations –Gravitational lens source list Flat spectrum, compact objects  Geometry of the Universe (ala CLASS project) Transient detection

6 A llen A rray T elescope FiGSS Layer Cake 10,000 Sq. Deg. 3 mJy 100 Sq. Deg. 1 mJy 10 Sq. Deg. 0.3 mJy Daily Every 10 Days Every 100 Days Overlap with SWIRE Overlap with SDSS/FIRST/NVSS Overlap COSMOS Transients & Steady Sources

7 A llen A rray T elescope Radio Transient Source Counts FiGGS Orphan Afterglows RSNe Tidal Flares IDV ???

8 A llen A rray T elescope Transients Discovered in the VLA Archives VLA calibration check observations 1983-2003 ~1000 weekly epochs 1.4, 5, 8.4 GHz 40 uJy rms/epoch Effective surveyed area at 600 microJy ~10 sq degrees 10 Transients Discovered (□◊Δ) Very Deep, Multi-λ Images: 2.6 uJy rms

9 A llen A rray T elescope The Same Road Twice: Conclusions for Legacy Science The radio astronomy landscape is changing –ATA is coming soon ( also LOFAR, LWA, etc.) –Complementarity & synergy of efforts is critical ATA has powerful survey capability –Commensal RA & SETI FiGSS: simultaneous survey for transient and stationary sources Archival data are a powerful legacy product


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