Low Surface Brightness SD

Introduction

An astronomer wishes to discover new faint galaxies. To locate extended objects with low surface brightness in an image, all bright point sources and extended objects must be removed. Low surface brightness galaxy candidates are compared against background flux to determine existence.

Flow of Events

First, the astronomer searches the resource catalogue for image catalogues with magnitude and depth metadata. After selecting an appropriate catalogue, the astronomer searches the catalogue for images of point sources and other bright structures. After selecting a suitable image (or images), the astronomer can upload and run three pieces of code on the image: an algorithm to remove bright sources, an algorithm to smooth the image, and an algorithm to identify any extended sources that remain against the sky background. A list of extended source candidates is returned.

Sequence Diagram

UseCases:

These use cases are the ones that will be needed to deliver this case.

1. AuthenticateIdentity
2. PerformRegistrySearch
3. NegotiateAccessToResource
   • AuthenticateIdentity
   • DetermineAuthority
4. PerformCatalogueSearch
5. MySpaceStoreResults
   • NegotiateAccessToResource
     • AuthenticateIdentity
     • DetermineAuthority
6. DetermineProgram
   • AccessLibraryFunction
     • NegotiateAccessToResource
       • AuthenticateIdentity
       • DetermineAuthority
   • AccessWebService
     • NegotiateAccessToResource
       • AuthenticateIdentity
       • DetermineAuthority
   • UploadUserCode
     • NegotiateAccessToResource
       • AuthenticateIdentity
       • DetermineAuthority
     • MySpaceStoreResults
       • NegotiateAccessToResource
         • AuthenticateIdentity
         • DetermineAuthority
   • NegotiateAccessToJob
7. MySpacePublishDerivedData
8. NegotiateAccessToJob