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17106

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DataCite Commons2023-04-21 更新2025-04-15 收录
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http://esdcdoi.esac.esa.int/doi/html/data/astronomy/hst/17106.html
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We propose COS G130M (1096) observations of nine ultraviolet-bright star-forming galaxies lacking HST spectroscopy in the 950 - 1150 A wavelength regime. Our strategy is a dual approach to unveil the complex star formation histories of these galaxies which have archival large-aperture FUSE and longer-wavelength COS spectroscopy. Extending the existing COS coverage down to 950 A yields (i) panchromatic COS spectroscopy with matching apertures comma and (ii) same-wavelength spectroscopy with large (FUSE) and small (COS) apertures. The galaxies were selected to cover a representative range of morphology comma luminosity comma chemical composition and distance. The new data will open a new spectroscopic window that has not been explored in detail with HST. Comparison with FUSE spectra will allow a study of the scales of star formation over areas differing by factors of 150. The 950 - 1150 A wavelength region contains stellar and interstellar spectral lines complementing and expanding the diagnostics at longer wavelengths. In particular comma the strong O VI 1035 doublet with an ionization potential of 114 eV probes the highest energies powered by stellar winds. We will test and calibrate this line as a tracer of massive stars. In combination with available HST and other data we will investigate the star-formation history comma the kinematics of the interstellar medium comma and the effects of dust attenuation comma including the reddening law down to near the Lyman break.
提供机构:
European Space Agency
创建时间:
2023-04-21
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