First Results of the Chandra-LETGS

Details First Results of the Chandra-LETGS First Results of the Chandra-LETGS

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000adnx.conf...11p&link_type=abstract

Atomic Data Needs for X-ray Astronomy, p. 11

Astronomy and Astrophysics

Astrophysics

2

X Ray Astrophysics Facility, Gratings (Spectra), Energy Transfer, Spectral Resolution, X Ray Spectrometers, Data Processing, Wavelengths, Calibrating

Scientific paper

We present the first results obtained with the Low Energy Transmission Grating Spectrometer (LETGS) onboard the Chandra X-ray Observatory. The LETGS covers the wavelength range between 5 and 175 A (2.5-0.07 keV) with a spectral resolution of about 0.06 A. A number of calibration measurements were carried out in order to determine the instrument's performance, i.e., spectral resolution, the wavelength scale accuracy, and the effective area. The spectral resolution of the instrument, dominated by the angular resolution of the mirror, is as specified and predicted on the basis of preflight measurements. The calibration of the effective area is still an ongoing process. A serious problem for the LETGS is the high background of the HRC-S detector which serves as readout of the grating spectra. The 'First Light' observation of the star Capella shows a beautiful line-rich spectrum. He-like triplet diagnostics could be applied for the first time to a star other than the Sun.

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