NOTE: Most of the High Level Science Products are unavailable while unscheduled maintenance is being performed. They will be incrementally restored over the course of this week. We apologize for any inconvenience.
Welcome to the HST Spectroscopic Legacy Archive (HSLA).
With no space ultraviolet instruments currently planned for the near future, the data from the UV spectrographs aboard the Hubble Space Telescope (HST) possess a legacy value beyond their initial science goals. Since early 2016, the Hubble Spectroscopic Legacy Archive (HSLA) provides the community with all raw and associated combined spectra for COS far-ultraviolet data publicly available in the Mikulski Archive for Space Telescopes ("MAST"). These data are packaged into "smart archives" according to target type and scientific themes to facilitate the construction of archival samples for common science uses.
With every release the HSLA contents are also augmented with all COS datasets entered in the public domain since the previous release. These releases also capture significant calibration enhancements of the spectroscopic data they hold. In particular, this release of the HSLA was timed to inform proposers in preparation for the HST Cycle 26 call for proposals.
STIS UV spectra will be made available in future releases.
Data Release: July 2018
Access to the COS FUV and NUV exposures and associated co-adds, all the diagnostic plots, and cross-matched information from Simbad or NED can be found here:
If the contents of the HSLA were helpful to your research work, the following acknowledgment would be appreciated: "This research has made use of the HSLA database, developed and maintained at STScI, Baltimore, USA."
For more information on the latest COS FUV calibration updates included in this release, see:
For more information on the latest COS NUV calibration updates included in this release, see:
Descriptions of the original release (Feb. 2016) and of the overall structure of the database can be found here: ISR2017_04.pdf.
We invite questions and comments about the database to firstname.lastname@example.org.