Wide-range astronomical telescope

We present the results of optical spectroscopy for 19 quasar candidates at photometric redshifts z phot 3, 18 of which enter into the Khorunzhev et al. (2016) catalog (K16). This is a catalog of quasar candidates and known type 1 quasars selected among the X-ray sources of the 3XMM-DR4 catalog of the XMM-Newton serendipitous survey. We have performed spectroscopy for a quasi-random sample of new candidates at the 1.6-m AZT-33IK telescope of the Sayan Solar Observatory and the 6-m BTA telescope of the Special Astrophysical Observatory. The spectra at AZT-33IK were taken with the new low-and medium-resolution ADAM spectrograph that was produced and installed on the telescope in 2015. Fourteen of the 18 candidates actually have turned out to be quasars; 10 of them are at spectroscopic redshifts z spec > 3. The high purity of the sample of new candidates suggests that the purity of the entire K16 catalog of quasars is probably 70-80%. One of the most distant (z spec = 5.08) optically bright (i 21) quasars ever detected in X-ray surveys has been discovered.

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“…The neighboring spectral channels were binned by two along the wavelength axis. J215240.0+140206 z =2.17 16 Ly CIV J234214.1+303606 z =3.37…”

Section: Discussionmentioning

confidence: 99%

“…A quasi-random spectroscopic survey of 18 quasar candidates from the K16 catalog that previously had no spectroscopic redshifts has been conducted at the AZT-33IK telescope (Kamus et al, 2002) equipped with the low-and mediumresolution ADAM spectrograph (Afanasiev et al, 2016;.…”

Section: Observations At the Azt-33ik Telescope With The Low-and Medi...mentioning

confidence: 99%

Optical spectroscopy of candidates for quasars at 3 < z < 5.5 from the XMM-newton X-ray survey. A distant X-ray quasar at z = 5.08

et al. 2017

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“…The telescope AZT-33IK of ISTP SB RAS Sayan Solar Observatory can make trajectory and photometric measurements of artificial earth satellites and space debris in the optical and IR ranges in orbits of all types. The optical scheme of the telescope is designed in analogy with the Ritchey-Chrétien scheme with an equivalent focal length of 30 m; the telescope aperture is 1.6 m, the angular diameter of its field of view is 10 arcmin [Kamus et al, 2002]. The plane of the Cassegrain focus of the telescope is at a distance of 1015 mm from the top of the primary mirror, which allowed us to install a diagonal mirror in front of it, which can divert a beam to various devices located behind the primary mirror barrel.…”

Section: Special Purpose Telescope Azt-33ikmentioning

confidence: 99%

Optical Observations of Small Spacecraft and Space Debris at Istp Sb Ras Sayan Observatory

Korobcev

Mishina

2019

Solar-Terrestrial Physics

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Launch of several thousands of small spacecraft as part of satellite groups of various companies (OneWeb, SpaceX, etc.) is expected in the coming years. They will significantly increase the “population” in the low-orbit region. The spacecraft are designed mainly to provide telecommunications and remote sensing of Earth from space. They have a short lifetime. The use of high-speed sCMOS (scientific complementary metal-oxide-semiconductor) detectors in combination with medium diameter optical telescopes provides high temporal resolution, which allows us to get detailed brightness light curves and to estimate the state of small spacecraft. We present the technique and results of photometric measurements of small spacecraft obtained with the 1.6-meter AZT-33IK telescope of ISTP SB RAS Sayan Solar Observatory. Photometric measurements are shown to be an important source of information at various operational stages of satellites.

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“…We have performed a quasi-random spectroscopic survey of quasar candidates from the K16 catalog at the 1.6-m AZT-33IK telescope (Kamus et al, 2002;Denisenko et al, 2009) equipped with the low-and medium-resolution ADAM spectrograph (Afanasiev et al, 2016;Burenin et al, 2016). A number of additional observations were conducted with the SCORPIO I (Afanasiev and Moiseev, 2005) spectrograph at the 6-m BTA telescope.…”

Section: Spectroscopic Verificationmentioning

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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Wide-range astronomical telescope

Cited by 16 publications

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Optical spectroscopy of candidates for quasars at 3 < z < 5.5 from the XMM-newton X-ray survey. A distant X-ray quasar at z = 5.08

Optical spectroscopy of candidates for quasars at 3 < z < 5.5 from the XMM-newton X-ray survey. A distant X-ray quasar at z = 5.08

Optical Observations of Small Spacecraft and Space Debris at Istp Sb Ras Sayan Observatory

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

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