Science Applications of Montage: An Astronomical Image Mosaic Engine http://montage.ipac.caltech.edu/

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Science Applications of Montage An Astronomical
Image Mosaic Enginehttp//montage.ipac.caltech.e
du/

• G. Bruce Berriman, John Good and Anastasia Laity
  IPAC
• Joseph C. Jacob and Daniel S. Katz JPL
• Ewa Deelman, Gurmeet Singh and Mei-Hui Su ISI
• Roy Williams CACR, Thomas Prince Caltech

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History of Montage

• Funded by NASA Earth Sciences Technology Office
  Compute Technologies Program to deliver an image
  mosaic engine for the National Virtual
  Observatory
• Project deliverables completed 2/2005
• Mosaic engine available for download
• Proof of concept that an on request image mosaic
  service can be deployed on the Distributed
  Terascale Facility (Teragrid using same code as
  used on desktops
• NASA/IPAC Infrared Science Archive (IRSA) assumed
  responsibility for maintenance of the compute
  engine- Jan 2005
• National Virtual Observatory supporting the
  deployment of an operational on-request mosaic
  service on the Teragrid - Jan 2005
• IPAC supporting deployment dedicated on-request
  service for 2MASS for mosaics of size 3 deg x 3
  deg or less

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Montage Architecture

• Toolkit with stand-alone core processing
  modules for performing steps in producing an
  image mosaic that meets the users specifications
• Reprojection of input FITS image
• Supports all WCS projections
• Preserves astrometry and calibration fidelity of
  input images
• Rectification of background radiation to a common
  level
• Co-addition of rectified, reprojected images in
  FITS format
• Code distribution includes utilities such as
• Image cutouts, generation of browse JPEGs,
  determination of sky coverage of input files
• Written in ANSI C for performance and portability
• Highly scaleable
• Use same compute engine on many environments -
  desktop, cluster, grid

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Montage Customers and Applications

• Visible and Infrared Survey Telescope for
  Astronomy (VISTA) (under evaluation)
• Spitzer Space Telescope Legacy Projects
• SWIRE - trace the evolution of dusty,
  star-forming galaxies, evolved stellar
  populations, and active galactic nuclei to
  redshifts of z 3
• GLIMPSE - infrared survey of galactic plane to
  study global history of star formation and
  energetics of interstellar medium
• SAGE - Surveying the Agents of a Galaxys
  Evolution (SAGE) -Spitzer Survey of the Large
  Magellanic Cloud
• COSMOS Hubble Treasury Program
• Multi-wavelength studies of the large scale
  distribution of matter in the Universe
• The INT/WFC Photometric H-alpha Survey (IPHAS) of
  the Northern Galactic Plane

NEW
NEW
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Montage Customers and Applications -II

• Spitzer Space Telescope Outreach
• Generating as educational products distributed
  through the Cool Cosmos website
• Generate mosaics in uncommon projections, often
  the best ones for E/PO products
• Multi-Mission Archive at Space Telescope (MAST)
• J-band 2MASS mosaics sources in the MAST Imaging
  Scrapbook
• Accessible from MAST and from IRSA
• NASA/IPAC Infra Red Science Archive
• Creation of 3-color browse products, image cutout
  services
• Stellar Archive and Retrieval System (StARS)
  (unreleased)
• Database of stars that are candidates for having
  planets - Hipparcos catalog merged with stellar
  parameters from literature
• Montage generated 2MASS Finder Charts for Top
  6000 candidates

NEW
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Montage Customers and Applications -III

• NSF National Virtual Observatory (NVO)
• All Sky 2MASS mosaic
• NVO Quick Sky Statistics Service
• Generates images showing spatial coverage of
  astronomical catalogs at NED, IRSA and VizieR
• Montage components used to determine sky
  coverage, and generate single-survey and
  composite-survey coverage maps

SEE POSTER SPS6-8
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Applications - VISTA

• Visible and Infrared Survey Telescope for
  Astronomy (2007)
• 4-m class imaging survey telescope in Chile
• 67-million pixel camera (1.6 deg FoV)
• 16 2048x2048 arrays

Observing Mode

• Evaluation of Montage
• Six stepped exposures fill a "Tile" with at least
  two exposures
• Automated pipeline processes each "pawprint",
• Montage is under evaluation as part of
  post-pipeline backend to stitch the pawprints
  together to create the tile
• Compute the image geometry to high precision and
  co-add the individual images
• Compensate for variability in sky conditions

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SAGE Spitzer Survey of the Large Magellanic
Cloud
Instrument Bands (?m) Field-of-View (arcmin)
IRAC 3.5, 4.5, 5.8, 8.0 5.2. x 5.2
MIPS 24 5.4 x 5.4
70 5.25 x 2.6
160 0.5 x 0.5

• Two epochs
• Oct/Nov 05

IRAC 3.6 ?m
IRAC 8.0 ?m
MIPS 24 ?m
Two epochs Jul/Aug 05 Oct/Nov 05
Images Courtesy Margaret Meixner (PI)
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Image Access and Visualization Services at IRSA
http//irsa.ipac.caltech.edu/
ngc4450 IRAC 3-Color
Finder Chart - on-request 3-color images from
SDSS, 2MASS, and DSS. Example 3-color DSS
image of NGC 5584
ngc4450 Optical 3-Color Preview
Generate three color preview images of Spitzer
data
Image Cutouts - on-request image cutouts from all
image data sets housed at IPAC. Example MSX
cutouts at Galactic Center
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An On-Request Compute Service
Monitor job status
Enter mosaic request
View and download mosaic
View messages
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Science Result - Verification of a Bar in the
Spiral Galaxy M31

• Beaton et al. Ap J Lett in press
• Montage used to generate 2MASS mosaic of M31
  galaxy
• Background rectification brings out boxy bulge
  - signature of bar

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Summary

• Montage is in active use
• Generation of science products
• Supporting scientific research
• Performing pathfinder studies in image
  processing at scale
• On-request service under will be publicly
  deployed in Winter 2006
• To learn more or download the distribution, visit
  the project web site at http//montage.ipac.caltec
  h.edu/

Right M51. Composite of of 2MASS, DPOSS AND SDSS
images computed on the Teragrid with the Montage
on-request service.