Discovery of the optically bright, wide separation double quasar SDSS J1442+4055

Sergeyev, A.; Zheleznyak, A. P.; Shalyapin, V. N.; Goicoechea, L. J.

doi:10.1093/mnras/stv2763

Cited by 14 publications

(19 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…( ) Redshift from gravitational lensing data and a concordance cosmology. This measurement is in reasonable agreement with the photometric redshift of the secondary lensing galaxy and the most distant overdensity, as well as the redshift of one of the absorption systems and subsequent characterisation (Sergeyev et al 2016). After selecting three superb candidates through Maidanak Astronomical Observatory (MAO) deep imaging under good seeing conditions (i.e.…”

Section: Sample Of Glqssupporting

confidence: 79%

New database for a sample of optically bright lensed quasars in the northern hemisphere

Gil-Merino

Goicoechea

Shalyapin

et al. 2018

A&A

Self Cite

View full text Add to dashboard Cite

In the framework of the Gravitational LENses and DArk MAtter (GLENDAMA) project, we present a database of nine gravitationally lensed quasars (GLQs) that have two or four images brighter than r = 20 mag and are located in the northern hemisphere. This new database consists of a rich variety of follow-up observations included in the GLENDAMA global archive, which is publicly available online and contains 6557 processed astronomical frames of the nine lens systems over the period 1999−2016. In addition to the GLQs, our archive also incorporates binary quasars, accretion-dominated radio-loud quasars, and other objects, where about 50% of the non-GLQs were observed as part of a campaign to identify GLQ candidates. Most observations of GLQs correspond to an ongoing long-term macro-programme with 2−10 m telescopes at the Roque de los Muchachos Observatory, and these data provide information on the distribution of dark matter at all scales. We outline some previous results from the database, and we additionally obtain new results for several GLQs that update the potential of the tool for astrophysical studies.

show abstract

Section: Sample Of Glqssupporting

confidence: 79%

New database for a sample of optically bright lensed quasars in the northern hemisphere

Gil-Merino

Goicoechea

Shalyapin

et al. 2018

A&A

Self Cite

View full text Add to dashboard Cite

show abstract

“…Concurrently with the SQLS search, lenses were found using an infrared-excess from 2MASS (Ofek et al 2007) or using the better quality, redder imaging of UKIDSS (Jackson et al 2008(Jackson et al , 2009(Jackson et al , 2012. More recent lens discoveries in Pan-STARRS, SDSS, and VST-ATLAS have yielded several new lenses, through photometric selection (Schechter et al 2017Agnello et al 2018a;Ostrovski et al 2018;Williams et al 2018), further mining of the SDSS spectroscopic quasar sample (Sergeyev et al 2016;Shalyapin et al 2018), catalogued deblending , or serendipity (Berghea et al 2017;Lucey et al 2018). We therefore expect that lenses with high-redshift sources or bright lensing galaxies, and fainter systems with large separations, to still be plentiful in the SDSS and Pan-STARRS footprints.…”

Section: Current Lens Statistics and Lens Databasementioning

confidence: 99%

Gravitationally lensed quasars in Gaia – II. Discovery of 24 lensed quasars

Lemon

Auger

McMahon

et al. 2018

Monthly Notices of the Royal Astronomical Society

101

View full text Add to dashboard Cite

We report the discovery and spectroscopic confirmation of 22 new gravitationally lensed quasars found using Gaia data release 2. The selection was made using several techniques: multiple Gaia detections around objects in quasar candidate catalogues, modelling of unWISE coadd pixels using Gaia astrometry, and Gaia detections offset from photometric and spectroscopic galaxies. Spectra of 33 candidates were obtained with the William Herschel Telescope, 22 of which are lensed quasars, 2 highly probably lensed quasars, 5 nearly identical quasar pairs, 1 inconclusive system, and 3 contaminants. Of the 3 confirmed quadruply imaged systems, J2145+6345 is a 2.1 arcsecond separation quad with 4 bright images (G=16. 86, 17.26, 18.34, 18.56), making it ideal for time delay monitoring. Analysing this new sample alongside known lenses in the Pan-STARRS footprint, and comparing to expected numbers of lenses, we show that, as expected, we are biased towards systems with bright lensing galaxies and low source redshifts. We discuss possible techniques to remove this bias from future searches. A |b|>20 complete sample of lensed quasars detected by Gaia and with image separations above 1 arcsecond will provide a valuable statistical sample of around 350 systems. Currently only 96 known lenses satisfy these criteria, yet promisingly, our unWISE modelling technique is able to recover all of these with simple WISE-Gaia colour cuts that remove ∼80 per cent of previously followed-up contaminants. Finally, we provide an online database of known lenses, quasar pairs, and contaminant systems.

show abstract

“…The sample of new lenses includes one of the highest redshift lensed quasar (SDSS J1452+4224, z ≈ 4.8) found to date. SDSS J1442+4055 was also discovered independently by Sergeyev et al (2016). All the confirmed lenses from the BQLS have only two images.…”

Section: Discussionmentioning

confidence: 94%

The SDSS-III BOSS quasar lens survey: discovery of 13 gravitationally lensed quasars

More¹,

Oguri²,

Kayo³

et al. 2015

Mon. Not. R. Astron. Soc.

View full text Add to dashboard Cite

We report the discovery of 13 confirmed two-image quasar lenses from a systematic search for gravitationally lensed quasars in the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS). We adopted a methodology similar to that used in the SDSS Quasar Lens Search (SQLS). In addition to the confirmed lenses, we report 11 quasar pairs with small angular separations ( 2 arcsec) confirmed from our spectroscopy, which are either projected pairs, physical binaries, or possibly quasar lens systems whose lens galaxies have not yet been detected. The newly discovered quasar lens system, SDSS J1452+4224 at z s ≈ 4.8 is one of the highest redshift multiply imaged quasars found to date. Furthermore, we have over 50 good lens candidates yet to be followed up. Owing to the heterogeneous selection of BOSS quasars, the lens sample presented here does not have a well-defined selection function.

show abstract

Discovery of the optically bright, wide separation double quasar SDSS J1442+4055

Cited by 14 publications

References 49 publications

New database for a sample of optically bright lensed quasars in the northern hemisphere

New database for a sample of optically bright lensed quasars in the northern hemisphere

Gravitationally lensed quasars in Gaia – II. Discovery of 24 lensed quasars

The SDSS-III BOSS quasar lens survey: discovery of 13 gravitationally lensed quasars

Contact Info

Product

Resources

About