science applications of montage: an astronomical image mosaic engine esto g. bruce berriman, john...

Science Applications of Montage: An Astronomical

Image Mosaic Engine

http://montage.ipac.caltech.edu/

ESTO

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

•

IAU Prague, SPS3-52, August 2006

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


Montage Architecture• Toolkit with stand-alone “core” processing modules for

performing steps in producing an image mosaic that meets the user’s 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


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 Galaxy’s 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


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


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 POSTERSPS6-8


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

QuickTime™ and aTIFF (Uncompressed) decompressor

are needed to see this picture.

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

Observing Mode


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: 1. Oct/Nov 05

Two epochs: Jul/Aug 05 & Oct/Nov 05

IRAC 3.6 m

IRAC 8.0 m

MIPS 24 m

Images Courtesy Margaret Meixner (PI)


Image Access and Visualization Services at IRSAhttp://irsa.ipac.caltech.edu/

Finder Chart - on-request 3-color images from SDSS, 2MASS, and DSS. Example: 3-color DSS image of NGC 5584

Generate three color preview images of Spitzer data

ngc4450 IRAC 3-Color ngc4450 Optical 3-Color Preview

Image Cutouts - on-request image cutouts from all image data sets housed at IPAC. Example: MSX cutouts at Galactic Center


An On-Request Compute ServiceEnter mosaic request Monitor job status

View messages View and download mosaic


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


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.caltech.edu/

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

science applications of montage: an astronomical image mosaic engine esto g. bruce berriman, john...

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