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25 April 2024 |
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The Cosmic Origins Spectrograph | | James C. Green
; Cynthia S. Froning
; Steve Osterman
; Dennis Ebbets
; Sara H. Heap
; Claus Leitherer Jeffrey L. Linsky
; Blair D. Savage
; Kenneth Sembach
; J. Michael Shull
; Oswald H.W. Siegmund
; Theodore P. Snow
; John Spencer
; S. Alan Stern
; John Stocke
; Barry Welsh
; Stephane Beland
; Eric B. Burgh
; Charles Danforth
; Kevin France
; Brian Keeney
; Jason McPhate
; Steven V. Penton
; John Andrews
; Kenneth Brownsberger
; Jon Morse
; Erik Wilkinson
; | | Date: |
30 Sep 2011 | | Abstract: | The Cosmic Origins Spectrograph (COS) is a moderate-resolution spectrograph
with unprecedented sensitivity that was installed into the Hubble Space
Telescope (HST) in May 2009, during HST Servicing Mission 4 (STS-125). We
present the design philosophy and summarize the key characteristics of the
instrument that will be of interest to potential observers. For faint targets,
with flux F_lambda ~ 1.0E10-14 ergs/s/cm2/Angstrom, COS can achieve comparable
signal to noise (when compared to STIS echelle modes) in 1-2% of the observing
time. This has led to a significant increase in the total data volume and data
quality available to the community. For example, in the first 20 months of
science operation (September 2009 - June 2011) the cumulative redshift
pathlength of extragalactic sight lines sampled by COS is 9 times that sampled
at moderate resolution in 19 previous years of Hubble observations. COS
programs have observed 214 distinct lines of sight suitable for study of the
intergalactic medium as of June 2011. COS has measured, for the first time with
high reliability, broad Lya absorbers and Ne VIII in the intergalactic medium,
and observed the HeII reionization epoch along multiple sightlines. COS has
detected the first CO emission and absorption in the UV spectra of low-mass
circumstellar disks at the epoch of giant planet formation, and detected
multiple ionization states of metals in extra-solar planetary atmospheres. In
the coming years, COS will continue its census of intergalactic gas, probe
galactic and cosmic structure, and explore physics in our solar system and
Galaxy. | | Source: | arXiv, 1110.0462 | | Services: | Forum | Review | PDF | Favorites | |
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