Cosmic Cruising: 3D Visualizations of Large Scale Structure and GOODS

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Cosmic Cruising 3D Visualizations of Large Scale
Structure and GOODS

• Frank Summers
• STScI
• December 16, 2003

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Cosmic Cruising
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Cosmic Cruising

• 3D Flight through the universe
• Show the cosmic web
• Data
• N-body SPH simulation (Hernquist White)
• 22 M particles, 300 Mly periodic cube
• Viz
• Galaxies in white, dark matter in purple
• SPH shader
• Periodic replicas and dimming with distance

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Hubble Deep Field
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GOODS
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GOODS Data

• Great Observatories Origins Deep Survey
• Hubble observations
• 2 fields, HDF-N CDF-S
• ACS, 15 pointings, 4 colors (BVIZ), 5 epochs
• 250 million pixels, 600 million pixels
  interpolated
• Ground based wide field imaging
• Photometric redshift catalog

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GOODS Data
Hubble Deep Field North
Chandra Deep Field South
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GOODS Visualization Project

• Motivations
• 3D Fly through of galaxies in GOODS field
• Catalog of galaxy images sorted by redshift
• Visual representations of galaxy evolution
• Summer project Leigh Fletcher
• epoch 3 data, develop initial pipeline
• IMAX
• scale up visuals
• scale down script

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Resolutions
Dimensions
Total Pixels
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CDFS
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Sections to Stamps
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• Rotate crop
• 5 x 3 stamps
• 6,439 x 6,488 pixels each
• 32,195 x 19,464 total
• 627 M pixels

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Stretch

• FITS files 32 bits per color
• TIFF files 8 bits per color
• Challenges
• Remove noise
• See faint objects
• See detail in bright objects

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Clean
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Galaxy Cut-outs

• Catalog
• CDFS source extractor on z band
• 29,600 sources (c0.6z beta)
• Flags for stars, sources too close to edge, etc.
• Segmentation maps pixels for each source
• Images
• Identify region with border around each source
• Inverse rotation to match seg map FITS file
• Feather edges for smooth fade to black
• 25,386 images within stamps region

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Cut-out
Seg Map
Feathered
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Cleaned
Feathered
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Feathered
Seg Map
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Galaxy Redshifts

• Photometric redshift catalog
• derived from wide-field ground-based data
• 85,138 sources
• Dropouts list - 1417
• Cross-match catalogs
• cull based on catalog flags
• assign dropouts from list
• nearest source within 0.001-5 degrees
• 13,411 sources with redshifts

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3D Model

• Final culling
• redshift sources 13,411
• images 25,386
• star list 440
• 11,392 galaxies with image redshift
• Model
• texture mapped planes, sized for distance
• always face camera
• transparency proportional to brightness

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Choreography

• Fly past galaxies to show time development
• Imax considerations
• visual immersion
• slow movement
• low sweet spot

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Dots are keyframe positions
Camera tracks in x, y and z
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Spiral Galaxies

• Low redshift
• Nearby
• Roughly present time
• More developed

• High redshift
• Far away
• Many billions of years ago
• Less developed

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Spirals 0 3 Gly
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Spirals 3 7 Gly
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Spirals 7 Gly
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Visualization Wall
Viz Wall demo immediately following this talk
Room 331B
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Beyond 3D

• Context NGC 4414 Sombrero
• 2D pans, dissolves, compositing Shake
• Titles Credits
• Film recording
• Narration
• Music
• Sound mix

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Miscellaneous

• Stats
• 2 min 51 sec, 4103 frames
• 30 GB of files, nearly 100 billion pixels
• Sept 23 first meeting
• Dec 4 frames completed
• Hubble Minute
• Premiere
• Not at AAS Fernbank cancelled on us
• MD Science Center ? NASM ?

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Extra Slides
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CDFS
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Hubble Deep Field
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GOODS
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