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26 April 2024 |
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Article overview
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Discovery of strong Balmer line absorption in two luminous LoBAL quasars at z~1.5 | | Andreas Schulze
; Toru Misawa
; Wenwen Zuo
; Xue-Bing Wu
; | | Date: |
24 Oct 2017 | | Abstract: | We present the discovery of strong Balmer line absorption in H$alpha$ to
H$gamma$ in two luminous low-ionization broad absorption line quasars (LoBAL
QSOs) at z~1.5, with black hole masses around $10^{10}$ $M_odot$ from near-IR
spectroscopy. There are only two previously known quasars at z>1 showing Balmer
line absorption. SDSS J1019+0225 shows blueshifted absorption by ~1400 km/s
with an H$alpha$ rest-frame equivalent width of 13 AA{}. In SDSS J0859+4239
we find redshifted absorption by ~500 km/s with an H$alpha$ rest-frame
equivalent width of 7 AA{}. The redshifted absorption could indicate an inflow
of high density gas onto the black hole, while we cannot rule out alternative
interpretations. The Balmer line absorption in both objects appears to be
saturated, indicating partial coverage of the background source by the
absorber. We estimate the covering fractions and optical depth of the absorber
and derive neutral hydrogen column densities, $N_{
m{HI}}sim1.3 imes
10^{18}$ cm$^{-2}$ for SDSS J1019+0225 and $N_{
m{HI}}sim9 imes 10^{17}$
cm$^{-2}$ for SDSS J0859+4239, respectively. In addition, the optical spectra
reveal also absorption troughs in HeI* $lambda3889$ and $lambda3189$ in both
objects. | | Source: | arXiv, 1710.8563 | | Services: | Forum | Review | PDF | Favorites | |
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