aat Acta Astrophys. Tau. Acta Astrophysica Taurica 2712-925X Kiselev Nikolai Nikolaevich, Mosсow, settlement Moskovskii, Tat'yanin Park Str., 12, Moscow, Russia. RU 39 10.34898/aat.vol4.iss1.pp1-7 Сonference proceedings Objects with ultra-steep spectra in the central section of the RATAN Zenith Field (RZF) survey Parijskij Yu.N. Temirova A.V. Bursov N.N. Semenova T.A. Kudryashova A.A. Saint Petersburg Branch of Special Astrophysical Observatory of RAS, Pulkovskoye sh. 65/2., St. Petersburg 196140, Russia; Special Astrophysical Observatory of RAS, Nizhnij Arkhyz 369167, Karachai-Cherkessian Republic, Russia Saint Petersburg Branch of Special Astrophysical Observatory of RAS, Pulkovskoye sh. 65/2., St. Petersburg 196140, Russia Special Astrophysical Observatory of RAS, Nizhnij Arkhyz 369167, Karachai-Cherkessian Republic, Russia Special Astrophysical Observatory of RAS, Nizhnij Arkhyz 369167, Karachai-Cherkessian Republic, Russia Special Astrophysical Observatory of RAS, Nizhnij Arkhyz 369167, Karachai-Cherkessian Republic, Russia 28 09 2023 4 1 1 7 05 05 2022 Copyright (c) 2026 Parijskij Y., Temirova A., Bursov N., Semenova T., Kudryashova A. 2026 Yu.N. Parijskij, A.V. Temirova, N.N. Bursov, T.A. Semenova, A.A. Kudryashova The metadata for this submission is licensed under a Creative Commons Attribution 4.0 International License. Copyright and publishing rights for texts published in Acta Astrophysica Taurica is retained by the authors, with first publication rights granted to the journal.Texts are free to use with proper attribution and link to the licensing (Creative Commons Attribution 4.0 International).

A deep RATAN Zenith Field (RZF) survey at wavelength λ = 7.6 cm in the region 0h ≤ R.A. ≤ 24h, 40.5° ≤ DEC ≤ 42.5° was carried out with the RATAN-600 radio telescope. Within ±2′ of the center of the survey region, 448 objects were detected, with 73 of them being with ultra-steep spectra (USS), which are the main indicator for finding possible candidates for distant galaxies. Optical identifications for 31 of USS objects using the SDSS (DR7, DR12) surveys have been used. It turned out that 23 objects are galaxies, and 8 are star-forming objects. Photometric redshifts and radio luminosities at 3.9 and 1.4 GHz are determined for 31 objects with spectral indices α < -1.1, Sν ∝ να for which magnitudes in various filters are presented in the SDSS survey. In the sample of USS objects (23 galaxies and 8 star-forming sources), 15 galaxies have redshifts zph < 0.5, and 8 of them have relatively high radio luminosities L1.4 > 1026 W/HZ of type FR II. Seven galaxies at zph > 0.5 are also of type FR II. Six sources are of intermediate type FR I–FR II. Only two radio galaxies at zph < 0.5 proved to be a rare nearby galaxy with relatively low radio luminosity L1.4 < 1025 W/HZ (type FR I). These radio sources are either located in the dense intergalactic media of rich clusters of galaxies or confined within their host galaxies. Nearly all these sources can be observed with the SAO 6-m telescope. Galaxies with L1.4 ≥ 1026 W/HZ (FR II) have mr magnitudes in the range 18 ≤ mr ≤ 23.

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