Discovery of Strong Balmer Line Absorption in Two Luminous LoBAL Quasars at z ∼ 1.5

Schulze, Andreas; Misawa, Toru; Zuo, Wenping; Wu, Xue-Bing

doi:10.3847/1538-4357/aaa7f0

Cited by 11 publications

(13 citation statements)

References 73 publications

(97 reference statements)

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“…In contrast, previous BAL studies only found a small number (FeLo)BALQs with Ca II BAL features (e.g., Boksenberg et al 1977;Arav et al 2001;Hall et al 2003). Moreover, Balmer absorption lines have been observed in only a small number of FeLoBALQs (e.g., Hall 2007;Shi et al 2016;Schulze et al 2018). That is maybe because there has been no systematic study of FeLoBALQs prior to this work.…”

Section: Ca II He I* and Balmer Absorption Linesmentioning

confidence: 58%

The Physical Properties of Low Redshift FeLoBAL Quasars. I. Spectral Synthesis Analysis of the BAL Outflows using $SimBAL$

Choi¹,

Leighly²,

Terndrup³

et al. 2022

Preprint

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We present the first systematic study of 50 low redshift (0.66 < z < 1.63) iron lowionization broad absorption-line quasars (FeLoBALQs) using SimBAL which represents a more than five-fold increase in the number of FeLoBALQs with detailed absorption line spectral analyses. We found the outflows have a wide range of ionization parameters, −4 log U 1.2 and densities, 2.8 log n 8 [cm −3 ]. The objects in our sample showed FeLoBAL gas located at a wide range of distances 0 log R 4.4 [pc], although we do not find any evidence for disk winds (with R 0.01 pc) in our sample. The outflow strength primarily depends on the outflow velocity with faster outflows found in quasars that are luminous or that have flat or redder spectral energy distributions. We found that ∼ 18% of the FeLoBALQs in the sample have the significantly powerful outflows needed for quasar feedback. Eight objects showed "overlapping troughs" in the spectra and we identified eleven "loitering outflow" objects, a new class of FeLoBALQs that are characterized by low outflow velocities and high column density winds located log R 1 [pc] from the central engine. The FeLoBALs in loitering outflows objects do not show properties expected for radiatively driven winds and these objects may represent a distinct population among FeLoBALQs. We discuss how the potential acceleration mechanisms and the origins of the FeLoBAL winds may differ for outflows at different locations in quasars.

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Section: Ca II He I* and Balmer Absorption Linesmentioning

confidence: 58%

The Physical Properties of Low Redshift FeLoBAL Quasars. I. Spectral Synthesis Analysis of the BAL Outflows using $SimBAL$

Choi¹,

Leighly²,

Terndrup³

et al. 2022

Preprint

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“…Currently, there are only a handful of BALQSOs that exhibit hydrogen Balmer absorption lines (e.g. Aoki 2010;Ji et al 2012;Zhang et al 2015;Shi et al 2016;Sun et al 2017;Schulze et al 2018) Although Balmer absorption lines are often seen in galaxy spectra, it is unlikely that the ones we see in AT2018zr are due to intervening galaxies or clouds because of the following reasons. First, high-ionization absorption troughs are detected at the same velocities as the H Balmer absorption lines, suggesting a dynamical association between them.…”

Section: High Velocity Transient Bal Systemmentioning

confidence: 99%

Discovery of Highly Blueshifted Broad Balmer and Metastable Helium Absorption Lines in a Tidal Disruption Event

Hung

Cenko

Roth

et al. 2019

ApJ

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We report the discovery of non-stellar hydrogen Balmer and metastable helium absorption lines accompanying a transient, high-velocity (0.05c) broad absorption line (BAL) system in the optical spectra of the tidal disruption event (TDE) AT2018zr (z = 0.071). In the HST UV spectra, absorption of high-and low-ionization lines are also present at this velocity, making AT2018zr resemble a low-ionization broad absorption line (LoBAL) QSO. We conclude that these transient absorption features are more likely to arise in fast outflows produced by the TDE than absorbed by the unbound debris. In accordance with the outflow picture, we are able to reproduce the flat-topped Hα emission in a spherically expanding medium, without invoking the typical prescription of an elliptical disk. We also report the appearance of narrow (∼1000 km s −1 ) N III λ4640Å, He II λ4686, Hα, and Hβ emission in the late-time optical spectra of AT2018zr, which may be a result of UV continuum hardening at late time as observed by Swift. Including AT2018zr, we find a high association rate (3 out of 4) of BALs in the UV spectra of TDEs. This suggests that outflows may be ubiquitous among TDEs and may be less sensitive to viewing angle effects compared to QSO outflows.

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“…Kaspi et al 2005; Bentz et al 2009), this method allows an estimate of the mass of the SMBH, with a typical uncertainty of ∼0.3 dex. While the broad Hβ line is generally considered as the most reliable black hole mass estimator, the Mg ii line has also been shown to provide robust black hole masses (McGill et al 2008; Trakhtenbrot & Netzer 2012; Mejía-Restrepo et al 2016; Woo et al 2018;Schulze et al 2018). Since Hβ is not available for our sources, we base our black hole mass estimates on Mg ii.…”

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confidence: 99%

No signs of star formation being regulated in the most luminous quasars at z ∼ 2 with ALMA

Schulze

Silverman

Daddi

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We present ALMA Band 7 observations at 850µm of 20 luminous (log L bol > 46.9 [erg s −1 ]) unobscured quasars at z ∼ 2. We detect continuum emission for 19/20 quasars. After subtracting an AGN contribution, we measure the total far-IR luminosity for 18 quasars, assuming a modified blackbody model, and attribute the emission as indicative of the star formation rate (SFR). Our sample can be characterized with a log-normal SFR distribution having a mean of 140 M yr −1 and a dispersion of 0.5 dex. Based on an inference of their stellar masses, the SFRs are similar, in both the mean and dispersion, with star-forming main-sequence galaxies at the equivalent epoch. Thus, there is no evidence for a systematic enhancement or suppression (i.e., regulation or quenching) of star formation in the hosts of the most luminous quasars at z ∼ 2. These results are consistent with the Magneticum cosmological simulation, while in disagreement with a widely recognized phenomenological model that predicts higher SFRs than observed here based on the high bolometric luminosities of this sample. Furthermore, there is only a weak relation between SFR and accretion rate onto their supermassive black holes both for average and individual measurements. We interpret these results as indicative of star formation and quasar accretion being fed from the available gas reservoir(s) in their host with a disconnect due to their different physical sizes, temporal scales, and means of gas processing.

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Discovery of Strong Balmer Line Absorption in Two Luminous LoBAL Quasars at z ∼ 1.5

Cited by 11 publications

References 73 publications

The Physical Properties of Low Redshift FeLoBAL Quasars. I. Spectral Synthesis Analysis of the BAL Outflows using $SimBAL$

The Physical Properties of Low Redshift FeLoBAL Quasars. I. Spectral Synthesis Analysis of the BAL Outflows using $SimBAL$

Discovery of Highly Blueshifted Broad Balmer and Metastable Helium Absorption Lines in a Tidal Disruption Event

No signs of star formation being regulated in the most luminous quasars at z ∼ 2 with ALMA

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