ACS-SBC Search for Lyman α Emission from FUSE Lyman Continuum Candidates

Details ACS-SBC Search for Lyman α Emission from FUSE Lyman Continuum Candidates ACS-SBC Search for Lyman α Emission from FUSE Lyman Continuum Candidates

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344510m&link_type=abstract

American Astronomical Society, AAS Meeting #213, #445.10; Bulletin of the American Astronomical Society, Vol. 41, p.329

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We present prelimary results from an HST program to search for Lyα escaping from galaxies previously identified as good candidates to search for Lyman continuum (LyC) emission using FUSE. The selection criteria required redshifts high enough for LyC emission to avoid the HI absorption shadow of the Milky-way (z > 0.02), and be bright enough for FUSE to detect if the escape fraction > 5%. The LyC flux was estimated from extrapolations of GALEX FUV and NUV photometry. The candidates span a variety of morphological types, including face-on spirals, interacting systems, irregulars and compact blue objects. Unfortunately the FUSE mission ended before the LyC observations could be secured. Nevertheless, ACS-SBC three color images of these objects, composed of synthetic bandpass filters centered on 1316, 1413 and 1617 Angstroms, constructed by subtracting the nested set of F125LP, F140LP and F150LP long pass filter images, do show tantalizing hints of diffuse and concentrated Lyman alpha escape. If the recent installation of the Cosmic Origins Spectrograph (COS) on HST proves successful and if the telescope's MgF2 overcoated Al mirrors have maintained a good portion of their original reflectivity of 15% below 1150 Angstroms, then it may be possible to use this instrument to fulfill the original goals of the FUSE program. At the very least it will be possible to verify the existence and investigate the dynamics of Lyα escape in these objects. Support for this work was provided by NASA through grant number 11110 from the Space Telescope Science Institute, which is operated by AURA, Inc., under NASA contract NAS 5-26555.

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