Unidentified Features in the Ultraviolet Spectrum of X Per

Details Unidentified Features in the Ultraviolet Spectrum of X Per Unidentified Features in the Ultraviolet Spectrum of X Per

2009-03-09

arxiv.org/abs/0903.1593v1

Astrophys.J.697:684-692,2009; Erratum-ibid.702:823,2009

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

24 Pages, 5 Figures, ApJ Accepted 3/8/2009

Scientific paper

10.1088/0004-637X/697/1/684 10.1

High-resolution ultraviolet spectra from the Space Telescope Imaging Spectrograph (STIS) were used to search for unidentified interstellar absorption features in the well studied sightline towards X Per (HD 24534). The significance of features detected was determined from Gaussian fits to the data, as well as the features' persistence in multiple observations. Fixed pattern noise characteristics were studied in STIS echelle data to distinguish between interstellar and instrumental features. We report the detection of two unidentified features that stand out from the more common fixed pattern noise features. Both features have depths of > 3% of the continuum level making them very likely of interstellar origin. Lastly, we comment on possible carriers, and discuss future prospects for studying these and perhaps other unidentified lines in larger samples of sightlines.

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