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Exploring Radio Sky with ATA: Insights from FiGSS and Transient Surveys

This presentation delves into the revolutionary capabilities of the Allen Telescope Array (ATA) as it embarks on its FiGSS Five GHz Sky Survey. Covering 104 square degrees with high resolution, this survey promises to detect 250,000 sources while enhancing our understanding of galaxy evolution, star formation, and active galactic nuclei (AGN). The innovative survey methods and complementary archival data open up new avenues for transient detection and astronomy research, marking a significant advancement in radio astrophysics.

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Exploring Radio Sky with ATA: Insights from FiGSS and Transient Surveys

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  1. Low Hanging Fruit inThe New Radio SkyorRadio Surveys and Transients with the Allen Telescope ArrayorThe Same Road Twice Geoffrey Bower, UC Berkeley

  2. ATA-42 Operational Soon

  3. ATA FiGSS Five GHz Sky Survey • 5 GHz Counterpart to Sloan Digital Sky Survey • Overlap with NVSS, FIRST & SDSS • 104 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

  4. 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 (103 --106 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

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

  6. Radio Transient Source Counts FiGGS Orphan Afterglows RSNe Tidal Flares IDV ???

  7. 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

  8. 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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