A Catalog of Broad Absorption Line Quasars from the Sloan Digital Sky Survey Early Data Release

By T. Reichard, Gordon Richards, D. Schneider, P. Hall, A. Tolea, Julian Krolik, Z. Tsvetanov, D. V. vanden Berk, D. York, G. Knapp and 2 more. 2003

403 citations recorded by the source corpus.

We present a catalog of 224 broad absorption line quasars (BALQSOs) from the Sloan Digital Sky Survey's Early Data Release Quasar Catalog, including a relatively complete and homogeneous subsample of 131 BALQSOs. Since the identification of BALQSOs is subject to considerable systematic uncertainties, we attempt to create a complete sample of SDSS BALQSOs by combining the results of two automated selection algorithms and a by-eye classification scheme. One of these automated algorithms finds broad absorption line troughs by comparing with a composite quasar spectrum. We present the details of this algorithm and compare this method with one that uses a power-law fit to the continuum. The BALQSOs in our sample are further classified as high-ionization BALQSOs (HiBALs), low-ionization BALQSOs (LoBALs), and BALQSOs with excited iron absorption features (FeLoBALs); composite spectra of each type are presented. We further present a study of the properties of the BALQSOs in terms of the balnicity distribution, which rises with decreasing balnicity. This distribution of balnicities suggests that the fraction of quasars with intrinsic outflows may be significantly underestimated.

Subfields: Astronomy and Astrophysics

View Paper: https://www.semanticscholar.org/paper/838e03d1bc5b66a0731ef096dce446e0c5893e50

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

Citations in the corpus

COSBO: The MAMBO 1.2 Millimeter Imaging Survey of the COSMOS Field (2007, background): “The bright component harbors an X-ray luminous (XID 160) type 1 AGN (Trump et al. 2006); with LX 1044 erg s 1 (Table 3) it could be classified as a faint QSO.”
The Sloan Digital Sky Survey Quasar Catalog: Twelfth data release (2016, methodology): “This is due to the modified definition for AI used in Trump et al. (2006): the 0.9 factor in Eq.”
Continuum and Emission-Line Properties of Broad Absorption Line Quasars (2003, methodology): “2594 2000) have been published: the Early Data Release (EDR) BALQSO catalog (Reichard et al. 2003), the analysis of the balnicity distribution and BALQSO fraction in Tolea, Krolik, & Tsvetanov (2002), the identification of a significant population of unusual BALQSOs by Hall et al. (2002), and the…”
Red and Reddened Quasars in the Sloan Digital Sky Survey (2003, methodology): “…especially low-ionization BALs (LoBALs), are redder than the average quasar (Sprayberry & Foltz 1992; Yamamoto & Vansevičius 1999; Becker et al. 2000; Najita, Dey, & Brotherton 2000; Brotherton et al. 2001; Hall et al. 2002a; Reichard et al. 2003b), likely as a result of extinction by dust.”
The Sloan Digital Sky Survey Quasar Catalog. II. First Data Release (2003, methodology): “An investigation of the properties of the Paper I BALs is also given in Reichard et al. (2003a).”
Mapping extreme-scale alignments of quasar polarization vectors (2005, methodology): “The targets were mainly selected from the Véron catalogue (Véron-Cetty & Véron 2001) and from the Sloan Digital Sky Survey Early and First Data Releases (Schneider et al. 2002, 2003; Reichard et al. 2003).”
Gemini Near-Infrared Spectroscopy of Luminous z ∼ 6 Quasars: Chemical Abundances, Black Hole Masses, and Mg II Absorption (2007, background): “The fraction of BAL quasars in the sample is 16.7%, similar to the low-redshift fraction (Trump et al. 2006).”
THE z = 5 QUASAR LUMINOSITY FUNCTION FROM SDSS STRIPE 82 (2012, background): “…from quasars with unusually weak emission lines, which account for ∼ 6% of quasars at z > 4.2 (Diamond-Stanic et al. 2009), or from Broad Absorption Line (BAL) quasars, which tend to have moderately redder colors (e.g., Weymann et al. 1991; Brotherton et al. 2001; Reichard et al. 2003).”
Broad-line Balmer decrements in blue active galactic nuclei (2007, methodology): “These problems can be solved by assigning additionally larger weights to these critical regions in the fitting, following the weighting methods adopted by Tran et al. (1992) and Reichard et al. (2003).”
A CATALOG OF BROAD ABSORPTION LINE QUASARS IN SLOAN DIGITAL SKY SURVEY DATA RELEASE 5 (2008, methodology): “Previous studies have found that BAL QSOs are redder than non-BAL QSOs, with LoBALs even redder than HiBALs (e.g., Weymann et al. 1991; Brotherton et al. 2001; Reichard et al. 2003; Trump et al. 2006).”
The Sloan Digital Sky Survey Reverberation Mapping Project: Sample Characterization (2018, background): “BAL and mini-BAL quasars (e.g., Trump et al. 2006; Gibson et al. 2009; Pâris et al. 2017) were identified by their absorption troughs.”
FEEDBACK IN LUMINOUS OBSCURED QUASARS (2011, background): “Broad absorption-line troughs are seen in∼ 10− 20% of luminous quasars (e.g, Reichard et al. 2003), and there is good reason to believe that the outflows are ubiquitous but have a covering fraction of∼ 20%, at least for high-Lbol/LEdd systems (e.g., Weymann et al. 1981; Gallagher et al. 2007; Shen…”
A High-Resolution Survey of Low-Redshift QSO Absorption Lines: Statistics and Physical Conditions of O VI Absorbers (2007, background): “…from observations how much impact BAL QSOs really have on their surroundings, we do know that BALs are relatively common: based on a large sample of QSOs from the Sloan Digital Sky Survey (SDSS), Trump et al. (2006) report that 26% of a sample of QSOs at z ≥ 1.7 show broad C IV absorption features.”
Observations of feedback from radio-quiet quasars - I. Extents and morphologies of ionized gas nebulae (2013, background): “Broad absorption-line troughs are seen in ∼ 10− 20% of luminous quasars (Reichard et al. 2003), or alternatively the outflows are ubiquitous, and this frequency simply reflects their covering factors (Weymann et al. 1981; Gallagher et al. 2007; Shen et al. 2008).”
The X-Ray Properties of the Most Luminous Quasars from the Sloan Digital Sky Survey (2007, methodology): “Using a catalog of BAL quasars from DR3 compiled by Trump et al. (2006), we found six potential BAL spectrum does not show the emission feature seen by Rengstorf et al., and we identify this object as a Galactic star and not a quasar. quasars in our SDSS sample.”
The Sloan Digital Sky Survey Quasar Catalog. IV. Fifth Data Release (2007, background): “There have been two editions of the SDSS BAL Quasar Catalog; the first, associated with Paper I, contained 224 BAL quasars (Reichard et al. 2003); the second was based on the Paper III catalog and presents 4787 BAL quasars (Trump et al. 2006).”
The Sloan Digital Sky Survey Quasar Catalog: Fourteenth data release (2017, background): “…of a significant sample of z > 5 quasars (e.g. Fan et al. 2006; Jiang et al. 2008), large samples of broad absorption line (BAL) quasars (e.g. Reichard et al. 2003; Trump et al. 2006; Gibson et al. 2008), type 2 candidates (Reyes et al. 2008) or samples of objects with peculiar properties…”
The Intrinsic Fraction of Broad Absorption Line Quasars (2008, methodology): “In essence, Trump et al. (2006) argue that BALs can be both weaker and much narrower than has previously been supposed.”