By undertaking deep long-slit spectroscopy with the focal reducer SCORPIO of Russian 6m telescope, we studied stellar population properties and their variation radius in 15 nearby S0 galaxies sampling a wide range luminosities environments. For large-scale disks S0s, have measured SSP-equivalent metallicities ranging from solar one down to [Z/H]=-0.4 - -0.7, rather high magnesium-to-iron ratios, [Mg/Fe] > +0.2, mostly old ages. Nine (60%) older than 10 Gyr, among those find all which reside...

We present the first 3D observations of a diffuse elliptical galaxy (dE). The good quality data (S/N up to 40) reveal kinematical signature an embedded stellar disc, reminiscent what is commonly observed in galaxies, though similarity their origins questionable. Colour map built from HST ACS images confirms presence this disc. Its characteristic scale (about 3 arcsec = 250 pc) about half galaxy's effective radius, and its metallicity 0.1-0.2 dex larger than underlying population. Fitting...

A sample of completely isolated S0 galaxies has been studied by means long-slit spectroscopy at the Russian 6-m telescope. 7 12 have revealed a presence extended ionized-gas discs which rotation is mostly decoupled from stellar kinematics: 5 (71+/-17%) show visible counterrotation component with respect to component. The emission-line diagnostics demonstrates wide range gas excitation mechanisms, although pure young stars rare. We conclude that in all cases gaseous our S0s are external...

Abstract We present long-slit and panoramic spectroscopy of extended gaseous disks in 18 S0 galaxies, mostly groups. The gas has often decoupled kinematics: at least five galaxies demonstrate strongly inclined large-scale ionized disks, seven reveal circumnuclear polar NGC 2551 the gas, although confined to main plane, counterrotates stars. excitation analysis reveals ionization by young stars 12 galaxies; current star formation these is ring-like zones coinciding with their UV rings. Gas...

By combining new long-slit spectral data obtained with the Southern African Large Telescope for nine galaxies our previously published observations 12 additional galaxies, we study stellar and gaseous kinematics as well radially resolved population properties ionized-gas metallicity excitation a sample of isolated lenticular galaxies. We have found that there is no particular time frame formation galaxies: mean ages bulges disks are distributed between 1 Gyr, bulge disk in every galaxy...

We have obtained two-dimensional spectral data for a sample of 58 nearby S0 galaxies with the Multi-Pupil Fiber/Field Spectrograph 6 m telescope Special Astrophysical Observatory Russian Academy Sciences. The Lick indices Hβ, Mg b, and ⟨Fe⟩ are calculated separately nuclei bulges taken as rings between R = 4'' 7'', luminosity-weighted ages, metallicities, Mg/Fe ratios stellar populations estimated by comparing to single population (SSP) models. Four types galaxy environments considered:...

Although thick stellar discs are detected in nearly all edge-on disc galaxies, their formation scenarios still remain a matter of debate. Due to observational difficulties, there is lack information about populations. Using the Russian 6-m telescope BTA we collected deep spectra three S0-a galaxies located different environments: NGC4111 dense group, NGC4710 Virgo cluster, and NGC5422 sparse group. We see intermediate age (4-5 Gyr) metal rich ([Fe/H] $\sim$ -0.2 - 0.0 dex) populations...

ABSTRACT Giant low surface brightness galaxies (gLSBGs) with dynamically cold stellar discs reaching the radius of 130 kpc challenge currently considered galaxy formation mechanisms. We analyse new deep long-slit optical spectroscopic observations, archival images, and published Hi data for a sample seven gLSBGs, which we performed mass modelling estimated parameters dark matter haloes assuming Burkert density profile. Our is not homogeneous by morphology, populations, total mass, however,...

Abstract Stellar counterrotation in disk galaxies directly relates to the complex phenomenon of mass assembly believed be driven by external processes, such as accretion and mergers. The study systems makes it possible reveal source establish details this process. In paper, we investigate galaxy PGC 66551 (MaNGA ID 1-179561), which hosts two large-scale counterrotating (CR) stellar disks identified Sloan Digital Sky Survey MaNGA data then confirmed using deep follow-up spectroscopy with 10 m...

NGC7217 is an unbarred early-type spiral galaxy having a multi-segment exponential light profile and system of starforming rings the unknown origin; it also possesses circumnuclear gaseous polar disc. We analysed new long slit spectroscopic data for derived radial distributions its stellar population parameters kinematics up to radius r~100 arcsec (~8 kpc). performed dynamical analysis by recovering velocity ellipsoid at different radii, estimated scaleheights two discs. The inner disc...

We have obtained and analyzed long-slit spectral data for the lenticular galaxy IC 719. In this gas-rich S0 galaxy, its large-scale gaseous disk counterrotates global stellar disk. Moreover in 719 we detected a secondary component corotating ionized gas. By using emission-line intensity ratios, proved gas excitation by young stars so are claiming current star formation, most intense ring-like zone at radius of 10" (1.4 kpc). The oxygen abundance starforming ring is about half solar...

The counter-rotation phenomenon in disc galaxies directly indicates a complex galaxy assembly history which is crucial for our understanding of physics. Here we present the data analysis lenticular NGC 448, has been recently suspected to host counter-rotating stellar component. We collected deep long-slit spectroscopic observations using Russian 6-m telescope and performed photometric decomposition Sloan Digital Sky Survey (SDSS) archival images. exploited (i) non-parametric approach order...

We have investigated a sample of S0 galaxies, mostly with circumnuclear dust lanes orthogonal to their major axes, chosen from Hubble Space Telescope Wide Field Planetary Camera 2 images. Two-dimensional spectroscopy undertaken the Multipupil Fiber Spectrograph 6 m telescope Special Astrophysical Observatory Russian Academy Sciences has revealed that indeed ionized gas in centers these eight lenticular galaxies rotate planes nearly rotation (and symmetry) central stellar components. Although...

We present a novel approach for simultaneous extraction of stellar population parameters and internal kinematics from the spectra integrated along line sight. fit template spectrum into an observed one in pixel space using non-linear $χ^2$ minimization multidimensional parameter space, including characteristics line-of-sight velocity distribution (LOSVD) parametrized star formation history (SFH). Our technique has been applied to IFU multi-object spectroscopy low-luminosity early type galaxies.

We report a discovery of extended counterrotating gaseous disks in early-type disk galaxies NGC 2551 and 5631. To find them, we have undertaken complex spectral observations including integral-field spectroscopy for the central parts long-slit deep to probe external parts. The line-of-sight velocity fields been constructed compared photometric structure galaxies. As result, revealed full-size disks, one coplanar stellar other inclined main suggest that observe early stages minor-merger...

We have studied an unbarred Sb galaxy with a nuclear star-forming ring, NGC 7742, by means of two-dimensional spectroscopy, long-slit and imaging compared the results properties another this type, 7217, which was us earlier. Both galaxies many peculiar features in common: each has two global exponential stellar disks different scale lengths, possesses circumnuclear inclined gaseous disk radius 300 pc, counterrotating subsystem, one 7742 7217. suggest that past minor merger is probable cause...

Lenticular galaxies are a morphological class of disc that in general lacks current star formation and extended gaseous discs. However recent ultraviolet (UV) surveys have revealed UV discs rings even among these 'red dead' galaxies, their origin is now still unclear. We studied the nature outer star-forming, UV-detected four unbarred S0 by undertaking long-slit spectroscopy with focal reducer SCORPIO Russian 6-m telescope. Gaseous NGC 252 4513 decoupled kinematics, ionized gas certainly...

Abstract Rings in S0s are enigmatic features that can, however, betray the evolutionary paths of particular galaxies. We have undertaken long-slit spectroscopy five lenticular galaxies with UV-bright outer rings. The observations been made Southern African Large Telescope to reveal kinematics, chemistry, and ages stellar populations gas characteristics rings surrounding disks. Four also bright H α emission line, spectra gaseous extracted around maxima equivalent width excitation by young...

We present the results of a new H i, optical, and Hα interferometric study nearby spiral galaxy NGC 157. Our combined C- D-array observations with VLA show large-scale, ring-like structure in neutral hydrogen underlying optical disc, together an extended, low surface density component going out to nearly twice Holmberg radius. Beginning just inside edge star-forming line nodes gas disc commences 60° warp, while at same time, rotation velocity drops by almost half its peak value 200 km s−1,...

Aims.We probe the stellar population age and metallicity distributions in nearby elliptical galaxies over largest extension to date.

We present the detailed study of stellar and gaseous kinematics luminous early-type galaxy NGC 524 derived from long-slit spectroscopic observations obtained with Russian 6-m telescope IFU data SAURON survey. The line-of-sight velocity distribution (LOSVD) exhibits strong asymmetry. performed comprehensive analysis LOSVD using two complementary approaches implemented on top nbursts full spectral fitting technique, (a) a nonparametric recovery (b) parametric Gaussian kinematical components...

The stellar population properties in the centers of NGC 5574 and 7457 (two lenticular galaxies previously shown to have radially homogeneous blue optical-band colors) are studied by means integral-field spectroscopy. compact nuclei appear be chemically distinct: nucleus is distinguished a higher than solar iron-to-magnesium ratio, drop mean metallicity factor 2 exists between bulge. Both demonstrate rather young luminosity-weighted age populations bulges, not older 5-7 Gyr; however, distinct...

The central regions of the three brightest members Leo I galaxy group—NGC 3368, NGC 3379, and 3384—are investigated by means two-dimensional spectroscopy. In all galaxies we have found separate circumnuclear stellar gaseous subsystems—more probably, disks—whose spatial orientations spins are connected to orientation supergiant intergalactic H ring reported previously Schneider et al. Schneider. 3368 global disk seems also be inclined symmetry plane body, being probably external origin....

We used deep long-slit spectra and integral-field spectral data to study the stars ionized gas kinematics stellar population properties in lenticular barred galaxy NGC 7743. have shown that at distances larger than 1.5 kpc from nucleus settles disk which is significantly inclined of galaxy. Making different assumptions about geometry disks involving sets emission lines into fitting, under assumption thin flat circular rotation, we obtain full possible range angle between be 34+/-9 or 77+/-9...