The European Hubble Space Telescope Legacy Archive Wolfram

The European Hubble Space Telescope Legacy Archive Wolfram Freudling

The Hubble Space Telescope 1 telescope 12 instruments FOC, FOS, GHRS, HSP, WF/PC 1, ACS, FGS, NICMOS, STIS, WFPC 2, COS, WFC 3 - currently, 3 instruments in operation - repair and service mission SM 4 in 2008 - expected lifetime > 2013 3 archives

• HST archives contain pipeline-reduced science-ready data • often requires significant processing before use • “difficult” data require significant expertise to process • new paradigm: Archive produces high-level Data Products: Hubble Legacy Archive (HLA) • also include community contributions • collaboration STSc. I, ST-ECF, CADC

HST DATA imaging (e. g. ACS, WFPC 2) single object spectroscopy (STIS) slitless spectroscopy (e. g. ACS, NICMOS)

Slitless Spectroscopy in Space • slitless spectroscopy inefficient from ground • but in space: – low background – surveys in regions of spectrum which are not accessible from ground (UV, IR) – high angular resolution of HST

Data Examples ACS NICMOS

HST Slitless Data HST focal plane sky distribution of H slitless spectroscopi data

HST Slitless Data

Mission Statement “Extract science grade 1 d spectra of all isolated objects visible in undispersed images of HST slitless spectrographs using the best possible calibration. ” 4 May 2006 Hubble Legacy Archive 10

Goals We will try: • • extract 1 d spectra ( vs. F) of all easy (high s/n) spectra produce 2 d (x vs y ) cutouts of all spectra produce 2 d cutouts of corresponding objects on undispersed images extract spectra which are barely visible or noise only as long as there is an object visible on the undispersed image extract spectra for both point sources and extended sources extract spectra at the edge of detector extract spectra affected by bad pixels characterize extracted spectra (noise, continuum level, lines? , …) 4 May 2006 Hubble Legacy Archive 11

Goals II We will not try: • • extract spectra of objects without undispersed image deblend overlapping spectra produce validated 2 d spectra ( vs y) classify spectra (stellar, extragalactic, QSO, BD, …) 4 May 2006 Hubble Legacy Archive 12

Pipeline for HLA Grism Data: PHLAG pipeline extracts spectra from slitless HST spectra ü K in e m m r e t s po b rt a y. M l. a t le

ST-ECF HLA User Interface undispersed image displayed in Aladin spectrum selector spectra displayed in VOspec

Conclusions The ST-ECF Hubble Legacy Archive will contain: 4 • ~ 10 near IR spectra 1. 1 to 1. 9 µm (NICMOS G 141) o unique wavelength coverage o deep unbiased survey 5 • ~ 10 optical spectra 6000 to 10000 Å (ACS WF) o deep, wide-angle spectroscopic survey • quasi-randomly distributed over the sky • best quality at high galactic latitude