SDSS QUASARS IN THE<i>WISE</i>PRELIMINARY DATA RELEASE AND QUASAR CANDIDATE SELECTION WITH OPTICAL/INFRARED COLORS

Wu, Xue-Bing; Hao, Guoqiang; Jia, Zheng; Zhang, Yanxia; Peng, Nanbo

doi:10.1088/0004-6256/144/2/49

Cited by 106 publications

(105 citation statements)

References 42 publications

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“…The lowest redshift is found for J003842.80+384551.9, at z = 0.093, while the highest redshift object is J011118.08+325833.8, at z = 3.204. For the optical selection criteria adopted here, low-redshift quasars selected as outliers of stellar loci on the SDSS color-color diagrams are mainly z 2.2 quasars (Fan 1999;Richards et al 2001), whereas the optical/IR algorithm is capable of finding quasars of redshifts up to z < 3.5 (Wu et al 2012). We note that there is no significant difference in redshift distribution between the optical and optical/IR selected quasars, as illustrated by the blue and red lines in Figure 4, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…For the sky area also covered by SDSS, we find that about 60% of these WISE-IR quasar candidates overlap with the optically selected low-redshift sample. As shown in Wu et al (2012), this IR-based technique is capable of finding quasars with redshifts up to z < 3.5.…”

Section: Candidate Selectionmentioning

confidence: 96%

“…Sources from Wide-field Infrared Survey Explorer (WISE; Wright et al 2010) classification; also Stern et al 2012;Wu et al 2012 and references therein) and cross-correlated with the optical point-source catalogs of SDSS, KPNO, and the Xuyi Schmidt Telescope Photometric Survey (XSTPS; X.-W. Liu et al, in preparation; see also http://kiaa.pku.edu.cn/DSSGAC/ overview.html). XSTPS has a component that extends to the M31/M33 area, as shown in Figure 1.…”

Section: Candidate Selectionmentioning

confidence: 99%

See 2 more Smart Citations

The Lamost Survey of Background Quasars in the Vicinity of the Andromeda and Triangulum Galaxies. Ii. Results From the Commissioning Observations and the Pilot Surveys

Huo

Liu

Xiang

et al. 2013

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We present new quasars discovered in the vicinity of the Andromeda and Triangulum galaxies with the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, also named the Guoshoujing Telescope, during the 2010 and 2011 observational seasons. Quasar candidates are selected based on the available Sloan Digital Sky Survey, Kitt Peak National Observatory 4 m telescope, Xuyi Schmidt Telescope Photometric Survey optical, and Wide-field Infrared Survey Explorer near-infrared photometric data. We present 509 new quasars discovered in a stripe of ∼135 deg 2 from M31 to M33 along the Giant Stellar Stream in the 2011 pilot survey data sets, and also 17 new quasars discovered in an area of ∼100 deg 2 that covers the central region and the southeastern halo of M31 in the 2010 commissioning data sets. These 526 new quasars have i magnitudes ranging from 15.5 to 20.0, redshifts from 0.1 to 3.2. They represent a significant increase of the number of identified quasars in the vicinity of M31 and M33. There are now 26, 62, and 139 known quasars in this region of the sky with i magnitudes brighter than 17.0, 17.5, and 18.0, respectively, of which 5, 20, and 75 are newly discovered. These bright quasars provide an invaluable collection with which to probe the kinematics and chemistry of the interstellar/intergalactic medium in the Local Group of galaxies. A total of 93 quasars are now known with locations within 2.• 5 of M31, of which 73 are newly discovered. Tens of quasars are now known to be located behind the Giant Stellar Stream, and hundreds are behind the extended halo and its associated substructures of M31. The much enlarged sample of known quasars in the vicinity of M31 and M33 can potentially be utilized to construct a perfect astrometric reference frame to measure the minute proper motions (PMs) of M31 and M33, along with the PMs of substructures associated with the Local Group of galaxies. Those PMs are some of the most fundamental properties of the Local Group.

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Section: Resultsmentioning

confidence: 99%

Section: Candidate Selectionmentioning

confidence: 96%

Section: Candidate Selectionmentioning

confidence: 99%

See 1 more Smart Citation

The Lamost Survey of Background Quasars in the Vicinity of the Andromeda and Triangulum Galaxies. Ii. Results From the Commissioning Observations and the Pilot Surveys

Huo

Liu

Xiang

et al. 2013

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“…This is a well-known technique (e.g., Richards et al, 2002;Wu et al, 2012;Skrzypek et al, 2015) for separating M-dwarfs from distant quasars. Stars have i ′ − z ′ > 0.8, while quasars have i ′ − z ′ < 0.4.…”

Section: Sample Selectionmentioning

confidence: 99%

Catalog of 3 < z < 5.5 Quasar Candidates Selected among XMM-Newton Sources and Its Spectroscopic Verification

Хорунжев

Sazonov

Burenin

et al. 2017

Front. Astron. Space Sci.

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We have compiled a catalog of 903 quasar candidates (including known quasars) at 3 < z < 5.5 selected among X-ray sources from the XMM-Newton serendipitous survey (3XMM-DR4 catalog). We used photometric SDSS, 2MASS, and WISE data to select the objects. The surface number density of objects in our sample exceeds that in the SDSS spectroscopic quasar sample at the same redshifts by a factor of 1.5. We have performed spectroscopic observations of a subsample of new quasar candidates using a new low-and medium-resolution spectrograph at the 1.6-m AZT-33IK telescope (Mondy, Russia) and demonstrated that the purity of these candidates is about 65%. We have discovered one of the most distant (z = 5.08) X-ray selected quasars.

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“…The RQ sample with MIR data is constructed by matching the DR7 quasar catalogue (Schneider et al 2010) and WISE all-sky catalogue (Wu et. al.…”

Section: Radio-quiet Quasarsmentioning

confidence: 99%

Covering factors of the dusty obscurers in radio-loud and radio-quiet quasars

Gupta

Sikora

Nalewajko

2016

Mon. Not. R. Astron. Soc.

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We compare covering factors of circumnuclear dusty obscurers in radio-loud and radio-quiet quasars. The radio-loud quasars are represented by a sample of FR II quasars obtained by cross-matching a catalog of the FR II radio sources selected by van Velzen et al. with the SDSS DR7 catalog of quasars. Covering factors of FR II quasars are compared with covering factors of the radio-quiet quasars matched with them in redshift, black hole mass, and Eddingtonratio. We found that covering factors, proxied by the infrared-to-bolometric luminosity ratio, are on average slightly smaller in FR II quasars than in radio-quiet quasars, however, this difference is statistically significant only for the highest Eddington ratios. For both samples, no statistically significant dependence of a median covering factor on Eddington ratio, black hole mass, nor redshift can be claimed.

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SDSS QUASARS IN THEWISEPRELIMINARY DATA RELEASE AND QUASAR CANDIDATE SELECTION WITH OPTICAL/INFRARED COLORS

Cited by 106 publications

References 42 publications

The Lamost Survey of Background Quasars in the Vicinity of the Andromeda and Triangulum Galaxies. Ii. Results From the Commissioning Observations and the Pilot Surveys

The Lamost Survey of Background Quasars in the Vicinity of the Andromeda and Triangulum Galaxies. Ii. Results From the Commissioning Observations and the Pilot Surveys

Catalog of 3 < z < 5.5 Quasar Candidates Selected among XMM-Newton Sources and Its Spectroscopic Verification

Covering factors of the dusty obscurers in radio-loud and radio-quiet quasars

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