scholarly journals A Sharp Rise in the Detection Rate of Broad Absorption Line Variations in a Quasar SDSS J141955.26+522741.1

2021 ◽  
Vol 906 (2) ◽  
pp. L8
Author(s):  
Qinyuan Zhao ◽  
Zhicheng He ◽  
Guilin Liu ◽  
Tinggui Wang ◽  
Hengxiao Guo ◽  
...  
Keyword(s):  
Absorption Line ◽  
Detection Rate ◽  
Broad Absorption ◽  
Sharp Rise ◽  
Broad Absorption Line

scholarly journals The role of LoBALs in quasar evolution

2019 ◽  
Vol 15 (S356) ◽  
pp. 285-289
Author(s):  
Clare Wethers ◽  
Jari Kotilainen ◽  
Malte Schramm ◽  
Andreas Schulze
Keyword(s):  
Absorption Line ◽  
Detection Rate ◽  
Direct Evidence ◽  
Broad Absorption ◽  
Detection Rates ◽  
Broad Absorption Line ◽  
Orientation Model ◽  
Evolutionary Phase

AbstractBroad absorption line quasars (BALs) represent an interesting yet poorly understood population of quasars showing direct evidence for feedback processes via powerful outflows. Whilst an orientation model appears sufficient in explaining the sub-population of high-ionisation BALs (HiBALs), low-ionisation BALs (LoBALs) may instead represent an evolutionary phase, in which LoBALs exist in a short-lived phase following a merger-driven starburst. Throughout this work, we test this evolutionary picture of LoBALs by comparing the FIR detection rates, SFRs and environments for a sample of 12 LoBALs to other quasar populations at 2.0 < z < 2.5, making use of archival Herschel SPIRE data. We find the LoBAL detection rate to exceed that of both HiBALs and non-BALs, indicating a potential enhancement in their SFRs. Indeed, we also find direct evidence for high SFRs (>750 Mȯyr−1) within our sample which may be consistent with an evolutionary paradigm.

scholarly journals Gaia-assisted discovery of a detached low-ionisation BAL quasar with very large ejection velocities

2020 ◽  
Vol 634 ◽  
pp. A111 ◽  
Author(s):  
J. P. U. Fynbo ◽  
P. Møller ◽  
K. E. Heintz ◽  
J. N. Burchett ◽  
L. Christensen ◽  
...  
Keyword(s):  
Emission Line ◽  
Absorption Line ◽  
Emission Lines ◽  
Broad Absorption ◽  
Broad Absorption Line ◽  
Red Edge ◽  
First Case ◽  
Bl Lac ◽  
Spatially Extended ◽  
Extended Emission

We report on the discovery of a peculiar broad absorption line (BAL) quasar identified in our Gaia-assisted survey of red quasars. The systemic redshift of this quasar was difficult to establish because of the absence of conspicuous emission lines. Based on deep and broad BAL troughs of at least Si IV, C IV, and Al III, a redshift of z = 2.41 was established under the assumption that the systemic redshift can be inferred from the red edge of the BAL troughs. However, we observe a weak and spatially extended emission line at 4450 Å that is most likely due to Lyman-α emission, which implies a systemic redshift of z = 2.66 if correctly identified. There is also evidence for the onset of Lyman-α forest absorption bluewards of 4450 Å and evidence for Hα emission in the K band consistent with a systemic redshift of z = 2.66. If this redshift is correct, the quasar is an extreme example of a detached low-ionisation BAL quasar. The BALs must originate from material moving with very large velocities ranging from 22 000 km s−1 to 40 000 km s−1. To our knowledge, this is the first case of a systemic-redshift measurement based on extended Lyman-α emission for a BAL quasar. This method could also be useful in cases of sufficiently distant BL Lac quasars without systemic-redshift information.

scholarly journals Multifrequency VLBI Observations of the Broad Absorption Line Quasar J1020 4320: Recently Restarted Jet Activity?

2013 ◽  
Vol 65 (3) ◽  
pp. 57 ◽  
Author(s):  
Akihiro Doi ◽  
Yasuhiro Murata ◽  
Nanako Mochizuki ◽  
Hiroshi Takeuchi ◽  
Keiichi Asada ◽  
...  
Keyword(s):  
Absorption Line ◽  
Broad Absorption ◽  
Broad Absorption Line ◽  
Vlbi Observations

scholarly journals The orientation and polarization of broad absorption line quasars★

2012 ◽  
Vol 428 (2) ◽  
pp. 1565-1578 ◽  
Author(s):  
M. A. DiPompeo ◽  
M. S. Brotherton ◽  
C. De Breuck
Keyword(s):  
Absorption Line ◽  
Broad Absorption ◽  
Broad Absorption Line

Serendipitous Discovery of a Broad Absorption Line QSO at [CLC][ITAL]z[/ITAL][/CLC] = 2.169

1998 ◽  
Vol 115 (3) ◽  
pp. 890-894 ◽  
Author(s):  
Gabriela Canalizo ◽  
Alan Stockton ◽  
Katherine C. Roth
Keyword(s):  
Absorption Line ◽  
Broad Absorption ◽  
Broad Absorption Line

scholarly journals Surprises from a Deep [ITAL]ASCA[/ITAL] Spectrum of the Broad Absorption Line Quasar PHL 5200

2001 ◽  
Vol 551 (1) ◽  
pp. L13-L16 ◽  
Author(s):  
S. Mathur ◽  
G. Matt ◽  
P. J. Green ◽  
M. Elvis ◽  
K. P. Singh
Keyword(s):  
Absorption Line ◽  
Broad Absorption ◽  
Broad Absorption Line
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