TY - JOUR
T1 - Broad Absorption Line Disappearance/Emergence in Multiple Ions in a Weak Emission-line Quasar
AU - Yi, W.
AU - Vivek, M.
AU - Brandt, W. N.
AU - Wang, T.
AU - Timlin, J.
AU - Ak, N. Filiz
AU - Schneider, D. P.
AU - Fynbo, J. P.U.
AU - Ni, Q.
AU - Vito, F.
AU - Indahl, B. L.
AU - Sameer,
N1 - Funding Information:
W. Yi thanks financial support from the China Scholarships Council (No. 201604910001) for his postdoctoral study at the Pennsylvania State University. W. Yi also thanks support from the Chinese National Science Foundation (NSFC-11703076) and the West Light Foundation of The Chinese Academy of Sciences (Y6XB016001). M.V. and W.N.B. acknowledge support from NSF grant AST-1516784. J.T. acknowledges support from NASA ADP grant 80NSSC18K0878. N.F.A. thanks TUBITAK (115F037) for financial support. F.V. acknowledges financial support from CONICYT and CASSACA through the Fourth call for tenders of the CAS-CONICYT Fund. The Cosmic Dawn Center is funded by the DNRF.
Funding Information:
Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. The Low-Resolution Spectrograph-2 (LRS2) was developed and funded by the University of Texas at Austin McDonald Observatory and Department of Astronomy, and by the Pennsylvania State University. We thank the Leibniz-Institut für Astrophysik Potsdam and the Institut für Astro-physik Göttingen for their contributions to the construction of the integral field units.
Publisher Copyright:
© 2019. The American Astronomical Society..
PY - 2019/1/10
Y1 - 2019/1/10
N2 - We report the discovery of the disappearance of Mg ii, Al iii, C iv, and Si iv broad absorption lines (BALs) at the same velocity (0.07c), accompanied by a new C iv BAL emerging at a higher velocity (up to 0.11c), in the quasar J0827+4252 at z = 2.038. This is the first report of BAL disappearance (i) over Mg ii, Al iii, C iv, and Si iv ions and (ii) in a weak emission-line quasar (WLQ). The discovery is based on four spectra from the Sloan Digital Sky Survey and one follow-up spectrum from Hobby-Eberly Telescope/Low-Resolution Spectrograph-2. The simultaneous C iv BAL disappearance and emergence at different velocities, together with no variations in the Catalina Real-Time Transient Survey light curve, indicate that ionization changes in the absorbing material are unlikely to cause the observed BAL variability. Our analyses reveal that transverse motion is the most likely dominant driver of the BAL disappearance/emergence. Given the presence of mildly relativistic BAL outflows and an apparently large C iv emission-line blueshift that is likely associated with strong bulk outflows in this WLQ, J0827+4252 provides a notable opportunity to study extreme quasar winds and their potential in expelling material from inner to large-scale regions.
AB - We report the discovery of the disappearance of Mg ii, Al iii, C iv, and Si iv broad absorption lines (BALs) at the same velocity (0.07c), accompanied by a new C iv BAL emerging at a higher velocity (up to 0.11c), in the quasar J0827+4252 at z = 2.038. This is the first report of BAL disappearance (i) over Mg ii, Al iii, C iv, and Si iv ions and (ii) in a weak emission-line quasar (WLQ). The discovery is based on four spectra from the Sloan Digital Sky Survey and one follow-up spectrum from Hobby-Eberly Telescope/Low-Resolution Spectrograph-2. The simultaneous C iv BAL disappearance and emergence at different velocities, together with no variations in the Catalina Real-Time Transient Survey light curve, indicate that ionization changes in the absorbing material are unlikely to cause the observed BAL variability. Our analyses reveal that transverse motion is the most likely dominant driver of the BAL disappearance/emergence. Given the presence of mildly relativistic BAL outflows and an apparently large C iv emission-line blueshift that is likely associated with strong bulk outflows in this WLQ, J0827+4252 provides a notable opportunity to study extreme quasar winds and their potential in expelling material from inner to large-scale regions.
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U2 - 10.3847/2041-8213/aafc1d
DO - 10.3847/2041-8213/aafc1d
M3 - Article
AN - SCOPUS:85060244647
VL - 870
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 2
M1 - L25
ER -