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Google Techtalk 2006
 

Google Techtalk 2006

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Google TechTalk at Google HQ, April 11 2006

Google TechTalk at Google HQ, April 11 2006

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Google Techtalk 2006 Google Techtalk 2006 Presentation Transcript

  • New Frontiers in Astronomy Hubble and Beyond C. A. Christian and A. Conti Space Telescope Science Institute
  •  
    • Visible – Hubble Space Telescope
    • Gamma rays - Compton Gamma Ray Obs.
    • X-rays - Chandra X-ray Observatory
    • Infrared - Spitzer Space Telescope
  • A New Era in Astronomy
    • 1960: astronomical data goes digital
    • New instruments collect 100s of GB/night
    • Detectors follow Moore’s law
    • Data avalanche: double every 2 years
    Growth over 25 years is a factor of 30 in collecting area, 3000 in pixels. Courtesy of Alex Szalay CCD area mpixels 3+ M telescopes area m^2
  • UDF
  • Tadpole
  •  
  • Egg Nebula
  • Cat’s Eye
  • Hodge301/Trantula
  • Light Echo
  •  
  • Sombrero
  • Sombrero IR
  • Sombrero composite
  • Orion Nebula
  •  
  • M101
  •  
  • Pillars in the Eagle Nebula
  • Public Outreach Collaborations Astronomical Data & Image Collection Public Info Informal Science News K-14 College/Univ Museums/ Planetaria
  • Public Data Access
    • Many observatories
    • Individual interfaces
    User Mission A Mission B Mission C Observatory X Observatory Y
  • The Virtual Observatory
    • Data Standards
    • Related tools
    Mission A Mission B Mission C Observatory X Observatory Y User VO
  • Press Release Collection Image Collection Registry: image collection description NVO Other astronomy registries
      • Protocol: NVO simple access image protocol
    Recover coordinates Traceback to original data Automate process
  • Image WCS Recovery Press image Find data and select strongest filter detection (R, H  , etc.) Combine several and clean wcs.compute uses identified objects in each image Voila - WCS! Backup slide
  • Collaboration: CLEA Virtual Education Observatory
    • Gettysburg College
    • Students choose part of sky to “observe”
    • Collect data from telescope/ instrument
    • Perform simple photometric data analysis
  • Sloan Digital Sky Interface
  • NVO Datascope Interface
  • Hubble Sky Coverage Map
  • DSS, SDSS, 2MASS, GALEX,…
  • NASA Data Centers
    • MAST: Multimission Archive at STScI
    • HEASARC: High Energy Astrophysics Science Archive Research Center
    • IRSA: Infrared Science Archives
    • LAMBDA: Legacy Archive for Microwave Background Data Analysis
    • MSC: Michelson Science Center
    • NASA ADS: Astrophysics Data System
    • NED: NASA Extragalactic Database
  • The Age of Large Surveys
    • Large number of new surveys
      • multi-TB in size, 100 million objects or more
      • individual archives planned, or under way
      • Data publication an integral part of the survey
    • Multi-wavelength view of the sky
    • Impressive early discoveries
  • Data Volume
    • Astronomers have ~ Petabytes online now.
    • Mine for new or interesting objects in a 400-D space
      • Positions, brightness, color, type, size, etc…
    • Data doubles every 2 years
    • Publishing data
    • Providing good visualization and query tools
  • International Virtual Observatory Alliance
  • Data Formats: FITS
    • FITS: Flexible Image Transport System
      • Standard astronomical binary data format
    • Composed of a sequence of Header Data Units (HDUs)
    • keyword=value statements, describe the organization of the data in the HDU and the format of the contents
    • HDU may contain a digital image, tables and multidimensional matrices
  • Data Formats: VOTable
    • XML format for tabular information
    • Catalog query results
    • List of images or spectra
    • List of resources
  • World Coordinate System
    • Coordinate Systems: Galactic, Ecliptic, J2000 Equatorial, B1950 Equatorial
    • WCS Projections: LIN, TAN, SIN, STG, AZP, ARC, ZPN, ZEA, AIR, CYP, CAR, MER, CEA, COP, COD, COE, COO, BON, PCO, SFL, PAR, AIT, MOL, CSC, TSC, DSS, PLT
  • ZIP Code in the Sky (HTM)
  • NVO Protocols SOAP Web Services
    • Cone search
      • Simple query around a given region
    • Simple image access
      • Create an image of this region.
      • First step produces VOTables with links to image
      • User downloads images as FITS in second stage
    • SkyNode
      • Sophisticated access to tables
      • Supports distributed queries
      • Uses ADQL
      • Should eventually subsume Cone-search
  • Resources
    • Registry
      • Collection of resources that users can find
      • Registry-registry communication via OAI
      • Some publishing registries are meant to be seen only by other registries
  •  
  • GALEX SQL Form
  • Sloan Digital Sky Interface
  • Challenges
    • 41,253 square degrees 2 Trillion pixels
    • One wavelength 4 Terabytes
    • Multi-wavelength 10-100 Terabytes
    • Time dimension 10 Petabytes
    • Hard to publish data & programs
    • Hard to find/understand data & programs
    • New analysis & visualization tools are required
    • Transition to the new astronomy
      • Sociological issues
  • Contact Information
    • Carol Christian [email_address]
    • Alberto Conti [email_address]