Properties of the Dust in the IRAS 13349+2438 Warm Absorber

Details Properties of the Dust in the IRAS 13349+2438 Warm Absorber Properties of the Dust in the IRAS 13349+2438 Warm Absorber

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...206.1114l&link_type=abstract

American Astronomical Society Meeting 206, #11.14; Bulletin of the American Astronomical Society, Vol. 37, p.447

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We obtained a high S/N UV spectrum of the archetypal infrared quasar IRAS13349+2438 (z=0.107) using the HST/STIS low-resolution gratings in February 2004. These observations were coordinated with a 300 ks Chandra HETG observation to probe the warm absorbing gas and dust in this quasar. We report the first reliable detection of ultraviolet absorption from this quasar. As with other warm absorbers showing strong soft X-ray absorption, we detect UV absorption lines due to H I, C IV, and N V. The spectrum is heavily reddened. Despite the high extinction, we do not see low-ionization UV absorption lines from species such as C II or Si IV. Fits to the spectrum using the HST composite QSO spectrum of Telfer et al. as a low-extinction template show that the reddening is best described by an SMC extinction curve. We will discuss the implications of our observations for the properties of the dust grains and for their location relative to the absorbing gas.

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