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26 April 2024 |
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Near-IR spectroscopy of luminous LoBAL quasars at 1<z<2.5 | | Andreas Schulze
; Malte Schramm
; Wenwen Zuo
; Xue-Bing Wu
; Tanya Urrutia
; Jari Kotilainen
; Thomas Reynolds
; Koki Terao
; Tohru Nagao
; Hideyuki Izumiura
; | | Date: |
19 Sep 2017 | | Abstract: | We present near-IR spectroscopy of 22 luminous low-ionization broad
absorption line quasars (LoBAL QSOs) at redshift 1.3<z<2.5, with 12 objects at
z~1.5 and 10 at z~2.3. The spectra cover the rest-frame H$alpha$ and H$eta$
line regions, allowing us to obtain robust black hole mass estimates based on
the broad H$alpha$ line. We use these data, augmented by a lower redshift
sample from the SDSS, to test the proposed youth scenario for LoBALs, which
suggests LoBALs to constitute an early short lived evolutionary stage of quasar
activity, by probing for any difference in their masses, Eddington ratios or
rest-frame optical spectroscopic properties compared to normal quasars. In
addition we construct the UV to mid-IR spectral energy distributions (SED) for
the LoBAL sample and a matched non-BAL quasar sample. We do not find any
statistically significant difference between LoBAL QSOs and non-BAL QSOs in
their black hole mass or Eddington ratio distributions. The mean UV to mid-IR
SED of the LoBAL QSOs is consistent with non-BAL QSOs, apart from their
stronger reddening. At z>1 there is no clear difference in their optical
emission line properties. We do not see particularly weak [OIII] nor strong
FeII emission. The LoBAL QSOs do not show a stronger prevalence of ionized gas
outflows as traced by the [OIII] line, compared to normal QSOs of similar
luminosity. We conclude that the optical-MIR properties of LoBAL QSOs are
consistent with the general quasar population and do not support them to
constitute a special phase of AGN evolution. | | Source: | arXiv, 1709.6335 | | Services: | Forum | Review | PDF | Favorites | |
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