Announcing A New HST+COS Central Wavelength: G130M/1222

Details Announcing A New HST+COS Central Wavelength: G130M/1222 Announcing A New HST+COS Central Wavelength: G130M/1222

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924119p&link_type=abstract

American Astronomical Society, AAS Meeting #219, #241.19

Astronomy and Astrophysics

Astrophysics

Scientific paper

The combination of the Hubble Space Telescope (HST) and the Cosmic Origins Spectrograph (COS) has been shown to be sensitive down to 912Å. However, the existing G140L/1280 and G130M central wavelengths (1055 and 1096) that sample below 1150Å are low-resolution (R < 5,000). In early HST Cycle 19 observations (PID#12505), we calibrated a new G130M central wavelength that is focused to maximize resolution in the astrophysically important 1070-1140Å region. Early observations indicate a resolution of R > 12,000 over the segment-B bandpass (1064-1207Å) and R> 10,000 over the segment-A bandpass (1222-1368Å). Raytrace estimates indicate a potential peak of R > 17,000 at 1140Å. This mode intentionally places Geocoronal Lyman-alpha on the FUV detector gap. This extends the lifetime of the COS FUV detectors as it removes the dominate source of unwanted detector-damaging light. In this presentation, we review the G130M/1022 calibration processes and results, as well as present ERO observations of the AGN HE0238-1904 and its high ionization intrinsic absorbers. This new central wavelength will be available to HST observers in Cycle 20.

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