Spectra of faint sources in crowded fields with FRODOSpec on the Liverpool Robotic Telescope

Shalyapin, V. N.; Goicoechea, L. J.

doi:10.1002/asna.201312049

Cited by 3 publications

(5 citation statements)

References 27 publications

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“…FRODOSpec is characterised by a field of view and a spatial scale of ∼ 10 ×10 and 0. 8 pixel −1 , respectively, and allows us to extract individual spectra for two point-like sources separated by a few pixels (Shalyapin & Goicoechea 2014). We also note that the spectrograph has two independent arms, allowing simultaneous spectroscopy at blue and red wavelengths.…”

Section: Resultsmentioning

confidence: 96%

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

Sergeyev¹,

Zheleznyak²,

Shalyapin³

et al. 2015

Mon. Not. R. Astron. Soc.

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Optically bright, wide separation double (gravitationally lensed) quasars can be easily monitored, leading to light curves of great importance in determining the Hubble constant and other cosmological parameters, as well as the structure of active nuclei and halos of galaxies. Searching for new double quasars in the SDSS-III database, we discovered SDSS J1442+4055. This consists of two bright images (r ∼ 18−19) of the same distant quasar at z = 2.575. The two quasar images are separated by ∼ 2. 1, show significant parallel flux variations and can be monitored from late 2015. We also found other two double quasar candidates, SDSS J1617+3827 (z = 2.079) and SDSS J1642+3200 (z = 2.264), displaying evidence for the presence of a lensing object and parallel flux variations, but requiring further spectroscopic observations to be confirmed as lensed quasars.

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Section: Resultsmentioning

confidence: 96%

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

Sergeyev¹,

Zheleznyak²,

Shalyapin³

et al. 2015

Mon. Not. R. Astron. Soc.

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“…All frames in Table 3 are ready to use because they were processed with standard techniques (sometimes as part of specific pipelines) or more sophisticated reduction procedures. For example, the LT website (see notes to Table 1) (Barnsley et al 2012) and the L2LENS reduction tool are described in Shalyapin & Goicoechea (2014b). We remark that the LT is a unique facility for photometric, polarimetric, and spectroscopic monitoring campaigns of GLQs.…”

Section: Sample Of Glqsmentioning

confidence: 99%

“…1 within a square of side ∼ 10 was one of the main reasons for a relatively low efficiency of the IFS monitoring. We obtained 16 reasonably good individual exposures with FRODOSpec, and one of them (on 1 March 2011) was exhaustively analysed by Shalyapin & Goicoechea (2014b). This paper addressed the whole processing method we used to obtain flux-calibrated spectra of sources in crowded fields from FRODOSpec observations 13 .…”

Section: Spectroscopymentioning

confidence: 99%

“…All iz-band frames were taken in 2010 and early 2011 ; (i) combined frames (deep imaging observations) ; (j) Spanish Service Time at the RMO ; (k) poorer sampling in 2010, 2013 and 2014 ; (l) ∼ 90% of frames in the r band ; (m) only two frames in 2015 ; (n) . The main differences between the standard L2 pipeline (Barnsley et al 2012) and the L2LENS reduction tool are described in Shalyapin & Goicoechea (2014b).…”

Section: Sample Of Glqsmentioning

confidence: 99%

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

Gil-Merino

Goicoechea

Shalyapin

et al. 2018

A&A

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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.

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“…In the [1−2] extensions, the L2LENS software produces the skyunsubtracted and flux-uncalibrated spectra of interest. The main differences between the standard L2 pipeline (Barnsley, Smith & Steele 2012) and the new L2LENS tool are described in Shalyapin & Goicoechea (2014a). Multi-extension FITS files from L1 and L2 are also available upon request.…”

Section: Observations and Their Statusmentioning

confidence: 99%

The GLENDAMA Database

Goicoechea¹,

Shalyapin²,

Gil-Merino³

2015

Preprint

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This is the first version (v1) of the Gravitational LENses and DArk MAtter (GLENDAMA) database accessible at http://grupos.unican.es/glendama/databaseThe new database contains more than 6000 ready-to-use (processed) astronomical frames corresponding to 15 objects that fall into three classes: (1) lensed QSO (8 objects), (2) binary QSO (3 objects), and (3) accretion-dominated radio-loud QSO (4 objects). Data are also divided into two categories: freely available and available upon request. The second category includes observations related to our yet unpublished analyses. Although this v1 of the GLENDAMA archive incorporates an X-ray monitoring campaign for a lensed QSO in 2010, the rest of frames (imaging, polarimetry and spectroscopy) were taken with NUV, visible and NIR facilities over the period 1999−2014. The monitorings and follow-up observations of lensed QSOs are key tools for discussing the accretion flow in distant QSOs, the redshift and structure of intervening (lensing) galaxies, and the physical properties of the Universe as a whole.

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Spectra of faint sources in crowded fields with FRODOSpec on the Liverpool Robotic Telescope

Cited by 3 publications

References 27 publications

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

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

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

The GLENDAMA Database

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