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Abstract: High-resolution ultraviolet spectra from the Space Telescope ImagingSpectrograph STIS were used to search for unidentified interstellarabsorption features in the well studied sightline towards X Per HD 24534. Thesignificance of features detected was determined from Gaussian fits to thedata, as well as the features- persistence in multiple observations. Fixedpattern noise characteristics were studied in STIS echelle data to distinguishbetween interstellar and instrumental features. We report the detection of twounidentified features that stand out from the more common fixed pattern noisefeatures. Both features have depths of > 3% of the continuum level making themvery likely of interstellar origin. Lastly, we comment on possible carriers,and discuss future prospects for studying these and perhaps other unidentifiedlines in larger samples of sightlines.



Autor: Joshua D. Destree, Theodore P. Snow

Fuente: https://arxiv.org/







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