1 / 14

The European Hubble Space Telescope Legacy Archive

The European Hubble Space Telescope Legacy Archive. Wolfram Freudling. The Hubble Space Telescope. 12 instruments FOC, FOS, GHRS, HSP, WF/PC1, ACS , FGS , NICMOS , STIS , WFPC2 , COS , WFC3. 1 telescope - currently, 3instruments in operation

ikia
Download Presentation

The European Hubble Space Telescope Legacy Archive

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The European Hubble Space Telescope Legacy Archive Wolfram Freudling

  2. The Hubble Space Telescope 12 instruments FOC, FOS, GHRS, HSP, WF/PC1, ACS, FGS, NICMOS, STIS, WFPC2, COS, WFC3 1 telescope - currently, 3instruments in operation - repair and service mission SM4 in 2008 - expected lifetime > 2013 3 archives

  3. 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 STScI, ST-ECF, CADC

  4. HST DATA single object spectroscopy (STIS) slitless spectroscopy (e.g. ACS, NICMOS) imaging (e.g. ACS, WFPC2)

  5. 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

  6. Data Examples ACS NICMOS

  7. HST Slitless Data sky distribution of HST slitless spectroscopic data HST focal plane

  8. HST Slitless Data

  9. Mission Statement “Extract science grade 1d 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

  10. Goals We will try: • extract 1d spectra ( vs. F) of all easy (high s/n) spectra • produce 2d (x vs y ) cutouts of all spectra • produce 2d 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

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

  12. Pipeline for HLAGrism Data: PHLAG pipeline extracts spectra from slitless HST spectra poster by Martin Kümmel et al.

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

  14. Conclusions The ST-ECF Hubble Legacy Archive will contain: • ~ 104near IR spectra 1.1 to 1.9 µm (NICMOS G141) • unique wavelength coverage • deep unbiased survey • ~ 105 optical spectra 6000 to 10000 Å (ACS WF) • deep, wide-angle spectroscopic survey • quasi-randomly distributed over the sky • best quality at high galactic latitude

More Related