Computer Science
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12214e&link_type=abstract
HST Proposal ID #12214. Cycle 18
Computer Science
Scientific paper
The identification of z<1.6 damped Lyman alpha {DLA} systems requires UV spectroscopy, but blind surveys are less than 10% efficient at finding them, making low z DLA surveys unpalatable for precious HST resources. Pre-selecting QSOs which exhibit strong intervening MgII absorption has increased the detection effiency to 35%. However, the last survey for low z DLAs was carried out 8 years ago and {combined with previous archival data} still only yielded 41 DLAs, compared to 1000 known systems at z>2. In this proposal, we aim to test a new selection technique, whereby we pre-select DLA candidates towards radio-loud QSOs which exhibit both MgII absorption AND 21cm absorption in optical and radio spectra respectively We expect this technique to be close to 100% efficient, but UV spectroscopy is the final step in the proof of concept. In this short pilot proposal we will observe five 21cm absorbers to confirm their DLA nature and pave the way for larger samples in the future. These data will also yield 5 new temperature measurements of the ISM in the 1
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