Welcome to the Hubble Legacy Archive

The Hubble Legacy Archive (HLA) is designed to optimize science from the Hubble Space Telescope by providing online, enhanced Hubble products and advanced browsing capabilities. The HLA is a joint project of the Space Telescope Science Institute (STScI), the Space Telescope European Coordinating Facility (ST-ECF), and the Canadian Astronomy Data Centre (CADC).

We recommend that first time HLA users begin by viewing this introductory movie: How to Search With the HLA (~5 min). There are also other movies available. Please consult the HELP page and the FAQ for more details.

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WHAT'S NEW in DR3 (May 2009)

NEW DATA PRODUCTS

NICMOS drizzled combined images
ACS extracted grism spectra for 1235 objects (provided by ST-ECF)
WFPC2 source lists
Sample prototypes of ACS multi-visit mosaics

USER INTERFACE ENHANCEMENTS

User position lists are accepted in a variety of input formats
Selected datasets (e.g., from clicking on footprints) can be added to cart
Selection of datasets can be used for sorting and filtering (e.g., to show selected data at the top of the table)
Cart can be used to retrieve both DADS and HLA data products
Cart includes estimated download data volume
GALEX catalog is available for overlay in interactive display
Advanced contrast controls in interactive display can be used to change color balance

HLA ESSENTIALS

The HLA interface runs in Firefox, Safari (version 3), Internet Explorer (version 7), and similar compatible browsers.
To fully realize all of the HLA's functionality, one must have cookies and popups enabled.
The HLA includes enhanced data products (ACS, WFPC2, & NICMOS images, ACS & WFPC2 source lists, ACS & NICMOS extracted grism spectra, prototype ACS mosaics) and also provides access to the standard HST data products when HLA enhanced products have not yet been created.
Footprints, which graphically display the sky coverage on a background image from the Digitized Sky Survey, are available for both standard and enhanced HST data products, including extracted grism spectra and community-contributed high-level science products.
Here is a matrix describing what is and is not in the HLA:

Instrument/Product	Source	HLA Enhanced Products¹	Download Format	Interactive Display?
Notes: Fraction of all HST data for which the HLA currently includes enhanced products. Note that the HLA searches and footprints also include standard products. Proprietary data and other data not yet processed by the HLA project are available through DADS requests (which may also be submitted using the HLA shopping cart). Contains all non-proprietary ACS data available on 7/15/2008 with the exception of ACS/SBC data from Jan. 13 to July 15, 2007, which will be added soon. The current ACS grism sample includes 1235 spectra in the vicinity of the UDF. STScI is reprocessing the NICMOS data using the latest calibration pipeline and the HLA has further enhanced this reprocessed data by producing drizzled images. Current the HLA has about 30% of the NICMOS science data, with the rest available through DADS.
ACS/combined images	STScI	~95%²	FITS	✔
ACS/source lists	STScI	~70% (e.g., not very crowded fields)	Ascii	✔
ACS/grism extractions	ST-ECF	10%³	FITS
ACS/mosaic images	STScI	small prototype sample	FITS	✔
WFPC2/combined images	CADC	~95%	FITS	✔
WFPC2/source lists	STScI	~70%	Ascii	✔
NICMOS/grism extractions	ST-ECF	~80%, 1-D & 2-D spectra	FITS
NICMOS/images	STScI	30% ⁴	FITS	✔
STIS/images and spectra	STScI		FITS	✔
FOS/spectra	STScI		Tar
GHRS/spectra	STScI		Tar
ACS,WFPC/Contributed Products	Community		FITS	✔

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--- The HLA Team
May 2009