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Strong quasar-galaxy lensing provides a powerful tool to probe theinter-stellar medium (ISM) of the lens galaxy using radiation from thebackground quasar. Using the Cosmic Origins Spectrograph (COS) on board theHubble Space Telescope, we study the cold ISM properties of the lens galaxy inB1152+199 at a redshift of z=0.4377. Since existing optical extinction andX-ray absorption measurements of the lens have revealed a large amount of coldISM, we expected to detect a damped Lya absorption (DLA) system in the nearultraviolet spectrum; however, our upper limit on the HI column density isseveral orders of magnitude below the expectation. We also marginally detect OIand CII absorption lines associated with the lens galaxy in the COS spectrum.Thus, the lens galaxy is identified as a ghostly DLA system, and furtherinvestigations of these ghostly DLA systems would be important to characterizethe biases of using DLAs to probe the matter density of the universe. Althoughpreliminary, the most likely explanation of the non-detection of the DLA isbecause of the Lya emission of the lens galaxy that fills in the absorptiontrough, with a Lya luminosity of 4e42 erg/s.

Identifying the Lens Galaxy B1152+199 as a Ghostly Damped Lyman Alpha System by the Cosmic Origins Spectrograph