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Resource Record Summary

Image Service:
Chandra Transmission Grating Catalog and Archive, Simple Image Access Interface

http://tgcat.mit.edu/image/TGCat_banner.png[Logo URL]
Short name: TGCat SIA
IVOA Identifier: ivo://cxc.mit/tgcat/SIAPublisher: Chandra Transmission Grating Catalog and Archive ivo://cxc.mit/tgcat[Pub. ID]
More Info: http://tgcat.mit.edu/about.php
Status: active
Registered: 2009 Jul 16 15:49:39Z


This resource describes the Simple Image Access interface provided by TGCat. References returned are of three types: 1) evt2 files - for ACIS see: http:// xc.harvard.edu/ciao/data_products_guide/event_descrip.html#acisl2tgevts - for HRC see: http://c c.harvard.edu/ciao/data_products_guide/event_descrip.html#hrcl2tgevts 2) Dispersion coordinates field image - Image of the field, in grating dispersion coordinates, order*wavelength ("m*lambda") on the x-axis, cross-dispersion angle [deg] (tg_d) on the y-axis. The outline shows the grating part region. The aspect ratio is not square 3) link to html preview page - see http://tgcat.mit.edu The Chandra Grating-Data Archive and Catalog (TGCat) makes grating spectra easily viewable and accessible. The browsable interface to analysis-quality spectral products (binned spectra and corresponding response files), with the addition of summary graphical products and model-independent flux properties tables make it easy to find observations of a particular object, type of object, or type of observation, to quickly assess the quality and potential usefulness of the spectra, and to download the data and responses as a package.

More About this Resource

About the Resource Providers

This section describes who is responsible for this resource

Publisher: Chandra Transmission Grating Catalog and Archive ivo://cxc.mit/tgcat[Pub. ID]

Creator: David Huenemoerder Contributor: CXC

Contact Information:
X David Huenemoerder
Email: dph at space.mit.edu
Address: MIT (NE80-6065) 77 Massachusetts Ave. Cambridge
MA 02139

Status of This Resource

This section provides some status information: the resource version, availability, and relevant dates.

Version: 1
Availability: This is an active resource.
  • This service apparently provides only public data
Relevant dates for this Resource:
  • Representative: 2009 Jul 16

This resource was registered on: 2009 Jul 16 15:49:39Z
This resource description was last updated on: 2010 Feb 19 12:39:21Z

What This Resource is About

This section describes what the resource is, what it contains, and how it might be relevant.

Resource Class: CatalogService
This resource is a service that provides access to data (specifically, images). With this type of service, you can search for data by issuing a query, and information about available data is returned as a table.
Resource type keywords:
  • Archive
  • Catalog
Subject keywords:
  • x ray spectra
  • transmission grating
  • gratings
  • spectroscopy
  • high resolution spectroscopy
  • HETG
  • LETG
  • HEG
  • MEG
  • LEG
  • ACIS
  • HRC
  • Chandra
This service provides data from:
  • facility: CXC
  • instrument: ACIS,HRC
Intended audience or use:
  • Research: This resource provides information appropriate for supporting scientific research.
More Info: http://tgcat.mit.edu/about.php

Related Resources:

This is a service for accessing data from:
Chandra Transmission Grating Catalog and Archive ivo://cxc.mit/tgcat [Res. ID]

Data Coverage Information

This section describes the data's coverage over the sky, frequency, and time.

Reference Coordinate System: UTC-ICRS-TOPOXXivo://STClib/CoordSys#UTC-ICRS-TOPO[Res. ID]

Sky Coverage: Regions covered:

  • All-sky: The data from this resource is distributed over the entire sky.

Wavebands covered:

  • X-ray

Temporal Coverage:

  • 1999-01-01T00:00:00.0 - 2009-12-31T00:00:00.0

Available Service Interfaces

Simple Image AccessXX

This is a standard IVOA service used to search for images from this resource that overlap with a specified region of the sky.

Available endpoints for the standard interface:
  • http://tgcat.mit.edu/tgSia.php?
Image service type: Pointed: pre-computed non-survey images will be returned.
Maximum query region accepted: no size limit
Maximum region size returned: no size limit
Maximum image size returned: 65536 X 65536 pixels
Maximum image size returned: 2 MB
Maximum number of matching records returned: 10000

Developed with the support of the National Science Foundation
under Cooperative Agreement AST0122449 with the Johns Hopkins University
The NAVO project is a member of the International Virtual Observatory Alliance

This NAVO Application is hosted by the Space Telescope Science Institute

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