A. Elyiv
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View article: Machine learning technique for morphological classification of galaxies from the SDSS. III. The CNN image-based inference of detailed features
Machine learning technique for morphological classification of galaxies from the SDSS. III. The CNN image-based inference of detailed features Open
This paper follows a series of our works on the applicability of various machine learning methods to morphological galaxy classification (Vavilova et al., 2021, 2022). We exploited the sample of ~315800 low-redshift SDSS DR9 galaxies with …
View article: Machine learning technique for morphological classification of galaxies from SDSS. II. The image-based morphological catalogs of galaxies at 0.02<z<0.1
Machine learning technique for morphological classification of galaxies from SDSS. II. The image-based morphological catalogs of galaxies at 0.02<z<0.1 Open
We applied the image-based approach with a convolutional neural network (CNN) model to the sample of low-redshift galaxies with –24m93 % of accuracy for five classes morphology prediction except the cigar-shaped (~75 %) and completely roun…
View article: Machine learning technique for morphological classification of galaxies from the SDSS
Machine learning technique for morphological classification of galaxies from the SDSS Open
Context. Machine learning methods are effective tools in astronomical tasks for classifying objects by their individual features. One of the promising utilities is related to the morphological classification of galaxies at different redshi…
View article: GAMA/XXL: X-ray point sources in low-luminosity galaxies in the GAMA G02/XXL-N field
GAMA/XXL: X-ray point sources in low-luminosity galaxies in the GAMA G02/XXL-N field Open
Relatively few X-ray sources are known that have low-mass galaxies as hosts. This is an important restriction on studies of active galactic nuclei (AGNs), hence black holes, and of X-ray binaries (XRBs) in low-mass galaxies; addressing it …
View article: VERIFICATION OF MACHINE LEARNING METHODS FOR BINARY MORPHOLOGICAL CLASSIFICATION OF GALAXIES FROM SDSS
VERIFICATION OF MACHINE LEARNING METHODS FOR BINARY MORPHOLOGICAL CLASSIFICATION OF GALAXIES FROM SDSS Open
We present a study on the verifica- tion of Machine Learning methods to be applied for binary morphological classification of galaxies. With this aim we used the sample of 60561 galaxies from the SDSSDR9 survey with a redshift of 0 . 02 < …
View article: BEHIND THE ZONE OF AVOIDANCE OF THE MILKY WAY: WHAT CAN WE RESTORE BY DIRECT AND INDIRECT METHODS?
BEHIND THE ZONE OF AVOIDANCE OF THE MILKY WAY: WHAT CAN WE RESTORE BY DIRECT AND INDIRECT METHODS? Open
Purpose: to present a brief overview of methods for restoring the large-scale structure of the Universe behind the Zone of Avoidance (ZoA) of the Milky Way; to propose a new “algorithm of darning the ZoA” and new approach based on the Gene…
View article: Morphological type and color indices of galaxies SDSS DR9 at 0.02 < r < 0.06
Morphological type and color indices of galaxies SDSS DR9 at 0.02 < r < 0.06 Open
Ìîðôîëîãè÷åñêèé òèï è ïîêàçàòåëè öâåòà ãàëàêòèê SDSS DR9 íà 0.02 < z £ 0.06 Èññëåäóåòñÿ êîððåëÿöèÿ ïîêàçàòåëÿ öâåòà öåíòðàëüíûõ ãàëàêòèê ( M r < -20.7) è èõ ñëàáûõ ãàëàêòèê-ñîñåäåé (M r ³ -20.7) èç âûáîðêè 60 561 ãàëàêòèê SDSS DR9, îãðàíè÷…
View article: The XXL Survey
The XXL Survey Open
Context. We present the results of a study of the active galactic nucleus (AGN) density in a homogeneous and well-studied sample of 167 bona fide X-ray galaxy clusters (0.1 < z < 0.5) from the XXL Survey, from the cluster core to the outsk…
View article: VizieR Online Data Catalog: WASP-22, WASP-41, WASP-42, WASP-55 (Southworth+, 2016)
VizieR Online Data Catalog: WASP-22, WASP-41, WASP-42, WASP-55 (Southworth+, 2016) Open
17 light curves of transits of the extrasolar planetary systems WASP-22, WASP-41, WASP-42 and WASP-55 are presented. 13 of the light curves were obtained using the Danish 1.54m telescope at ESO La Silla, Chile, in the Bessell R or Bessell …
View article: The XXL Survey
The XXL Survey Open
Context. The fraction of galaxies bound in groups in the nearby Universe is high (50% at z ~ 0). Systematic studies of galaxy properties in groups are important in order to improve our understanding of the evolution of galaxies and of the …
View article: THE TIME DELAY OF EXTRAGALACTIC COSMIC RAYS IN THE GALACTIC MAGNETIC FIELD
THE TIME DELAY OF EXTRAGALACTIC COSMIC RAYS IN THE GALACTIC MAGNETIC FIELD Open
We investigate the propagation of extragalactic cosmic rays (ECRs) in the regular component of the Galactic magnetic field. Especially we numerically calculate the expected time delay of ECRs due to curvature of trajectories. The maps of t…
View article: The <scp>XXL</scp> survey: First results and future
The <span>XXL</span> survey: First results and future Open
The XXL survey currently covers two 25 deg 2 patches with XMM observations of ∼10 ks. We summarize the scientific results associated with the first release of the XXL dataset, which occurred in mid‐2016. We review several arguments for inc…
View article: Faint-source-star planetary microlensing: the discovery of the cold gas-giant planet OGLE-2014-BLG-0676Lb
Faint-source-star planetary microlensing: the discovery of the cold gas-giant planet OGLE-2014-BLG-0676Lb Open
We report the discovery of a planet – OGLE-2014-BLG-0676Lb– via gravitational microlensing. Observations for the lensing event were made by the following groups: Microlensing Observations in Astrophysics; Optical Gravitational Lensing Expe…
View article: Adaptive PSF fitting – a highly performing photometric method and light curves of the GLS H1413+117: time delays and micro-lensing effects
Adaptive PSF fitting – a highly performing photometric method and light curves of the GLS H1413+117: time delays and micro-lensing effects Open
We present new photometric observations of H1413+117 acquired during seasons between 2001 and 2008 in order to estimate the time delays between the lensed quasar images and to characterize at best the on-going micro-lensing events. We prop…
View article: MiNDSTEp differential photometry of the gravitationally lensed quasars WFI 2033-4723 and HE 0047-1756: microlensing and a new time delay
MiNDSTEp differential photometry of the gravitationally lensed quasars WFI 2033-4723 and HE 0047-1756: microlensing and a new time delay Open
Aims. We present V and R photometry of the gravitationally lensed quasars WFI 2033-4723 and HE 0047-1756. The data were taken by the MiNDSTEp collaboration with the 1.54 m Danish telescope at the ESO La Silla observatory from 2008 to 2012.…
View article: The XXL survey XV: evidence for dry merger driven BCG growth in XXL-100-GC X-ray clusters
The XXL survey XV: evidence for dry merger driven BCG growth in XXL-100-GC X-ray clusters Open
The growth of brightest cluster galaxies (BCGs) is closely related to the properties of their host cluster. We present evidence for dry mergers as the dominant source of BCG mass growth at z ≲ 1 in the XXL 100 brightest cluster sample…
View article: The XXL Survey
The XXL Survey Open
X-ray extragalactic surveys are ideal laboratories for the study of the evolution and clustering of active galactic nuclei (AGN). The XXL Survey spans two fields of a combined 50 $deg^2$ observed for more than 6Ms with XMM-Newton, occupyin…
View article: Estimating the parameters of globular cluster M 30 (NGC 7099) from time-series photometry<i>(Corrigendum)</i>
Estimating the parameters of globular cluster M 30 (NGC 7099) from time-series photometry<i>(Corrigendum)</i> Open
Aims. We present the analysis of 26 nights of V and I time-series observations from 2011 and 2012 of the globular cluster M 30 (NGC 7099). We
\nused our data to search for variable stars in this cluster and refine the periods of known vari…
View article: Erratum: A detailed census of variable stars in the globular cluster NGC 6333 (M9) from CCD differential photometry
Erratum: A detailed census of variable stars in the globular cluster NGC 6333 (M9) from CCD differential photometry Open
peer reviewed
View article: High-precision photometry by telescope defocussing – VIII. WASP-22, WASP-41, WASP-42 and WASP-55
High-precision photometry by telescope defocussing – VIII. WASP-22, WASP-41, WASP-42 and WASP-55 Open
We present 13 high-precision and four additional light curves of four bright southern-hemisphere transiting planetary systems: WASP-22, WASP-41, WASP-42 and WASP-55. In the cases of WASP-42 and WASP-55, these are the first follow-up observ…
View article: The XXL Survey XIV. AAOmega Redshifts for the Southern XXL Field
The XXL Survey XIV. AAOmega Redshifts for the Southern XXL Field Open
We present a catalogue containing the redshifts of 3 660 X-ray selected targets in the XXL southern field. The redshifts were obtained with the AAOmega spectrograph and 2dF fibre positioner on the Anglo-Australian Telescope. The catalogue …