Astrophys. J., 835, 218-218 (2017/February-1)
A candidate for an intrinsic dusty absorber with a metal-rich damped Lyα absorption line system in the quasar J170542.91+354340.2.
PAN X., ZHOU H., GE J., JIANG P., YANG B., LU H., JI T., ZHANG S. and SHI X.
Abstract (from CDS):
We present a detailed analysis of the unusual damped Lyα absorption line system (DLA) toward the quasar SDSS J170542.91+354340.2 at a redshift of 2, previously reported by Noterdaeme et al. as one of the very few CO absorbers known to date at high z. This DLA is exceptional in that: (1) its extinction curve is similar to peculiar Milky Way sightlines penetrating star formation regions; (2) its absorption components are redshifted at a speed of several hundred km s–1 compared to broad Balmer emission lines; (3) its gas-phase metallicity is super-solar as evaluated from more than 30 absorption lines; (4) detection of residual flux in the DLA trough and variability of C IV absorption is possible. Based on these facts, we argue that this dusty DLA is a good candidate for an intrinsic quasar 2175 A absorber, and can originate from star formation regions of the quasar's host galaxy. We discuss in detail the gas and dust properties, and the dust depletion. Follow-up observations, such as spectropolarimetry and optical/infrared spectroscopy, will help to confirm the system's intrinsic nature and to explore how dust grains behave in the extreme environments proximate to quasars.
© 2017. The American Astronomical Society. All rights reserved.
dust, extinction - quasars: absorption lines - quasars: individual: SDSS J170542.91+354340.2 - quasars: individual: SDSS J170542.91+354340.2
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