902 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Bulgarian Academy of SciencesBG224 papers
- Centre National de la Recherche ScientifiqueFR67 papers
- Sofia University "St. Kliment Ohridski"BG64 papers
- Shumen UniversityBG62 papers
- Instituto de Astrofísica de CanariasES57 papers
- Instituto de Astrofísica de AndalucíaES55 papers
- National Institute for AstrophysicsIT54 papers
- Universidad de La LagunaES50 papers
- Astronomical ObservatoryRS48 papers
- Evgeni Kharadze Georgian National Astrophysical ObservatoryGE45 papers
- Aryabhatta Research Institute of Observational SciencesIN43 papers
- Osservatorio Astrofisico di TorinoIT43 papers
18 papers · 1 filter
Radar-Chart Analysis of Star-Formation Quenching Stages Across Circular Velocity Curve Classes in Nearby CALIFA Galaxies
Veselina Kalinova, Dario Colombo
We analyze the circular velocity curves of 215 non-active galaxies from the Calar Alto Legacy Integral Field spectroscopy Area survey. Using radar-chart analysis, we compare two cl…
Radio-loudness statistics of quasars from Quaia-VLASS
Nestor Arsenov, Sandor Frey, András Kovács +1
Quasars are objects of high interest in extragalactic astrophysics, cosmology, and astrometry. One of their useful qualities is their potential radio loudness. However, the fractio…
Density profile of a self-gravitating polytropic turbulent fluid in a rotating disk near to the cloud core
S. Donkov, I. Zh. Stefanov, T. V. Veltchev +1
We obtain two equations (following from two different approaches) for the density profile in a self-gravitating polytropic cylindrically symmetric and rotating turbulent gas disk.…
Neutron star mass in dark matter clumps
Maksym Deliyergiyev, Antonino Del Popolo, Morgan Le Delliou
This paper investigates a hypothesis proposed in previous research relating neutron star (NS) mass and its dark matter (DM) accumulation. As DM accumulates, NS mass decreases, pred…
Polarimetric Reverberation Mapping in Medium-Band Filters
Elena Shablovinskaya, Luka Č. Popović, Roman Uklein +8
Earlier, we suggested the "reload" concept of the polarimetric reverberation mapping of active galactic nuclei (AGN), proposed for the first time more than 10 years ago. We have su…
Density distribution function of a self-gravitating isothermal turbulent fluid in the context of molecular clouds ensembles -- III. Virial analysis
S. Donkov, I. Zh. Stefanov, T. V. Veltchev +1
In the present work we apply virial analysis to the model of self-gravitating turbulent cloud ensembles introduced by Donkov \& Stefanov in two previous papers, clarifying some asp…
Periodic variability of the z=2.0 quasar QSO B1312+7837
M. Minev, V. D. Ivanov, T. Trifonov +6
We report here the first results from a 15-yr long variability monitoring of the z=2.0 quasar QSO B1312+7837. It shows luminosity changes with a period P~6.13 yr (P~2.04 yr at rest…
Extraction of a second power-law tail of the density distribution in simulated clouds
L. Marinkova, T. Veltchev, Ph. Girichidis +1
The emergence and development of a power-law tail (PLT) at the high-density end of the observed column-density distribution is thought to be indicative for advanced evolution of st…
Density profile of a self-gravitating polytropic turbulent fluid in the context of ensembles of molecular clouds
S. Donkov, I. Zh. Stefanov, T. V. Veltchev +1
We obtain an equation for the density profile in a self-gravitating polytropic spherically symmetric turbulent fluid with an equation of state . This is don…
The VLT-FLAMES Tarantula Survey XXXII. Low-luminosity late O-type stars -- classification, main physical parameters, and silicon abundances
N. Markova, J. Puls, P. L. Dufton +6
Analysis of late O-type stars observed in the Large Magellanic Cloud (LMC) by the VLT-FLAMES Tarantula Survey (VFTS) revealed a discrepancy between the physical properties estimate…
Revealing the nature of central emission nebulae in the dwarf galaxy NGC 185
M. M. Vučetić, D. Ilić, O. V. Egorov +6
In this paper we present new optical observations of the galaxy NGC 185 intended to reveal the status of supernova remnants (SNRs) in this dwarf companion of the Andromeda galaxy.…
Optical observations of the nearby galaxy NGC 2366 through narrowband H and SII filters. Supernova remnants status
M. M. Vučetić, D. Onić, N. Petrov +2
We present detection of 67 HII regions and two optical supernova remnant (SNR) candidates in the nearby irregular galaxy NGC 2366. The SNR candidates were detected by applying [SII…
Optical observations of the nearby galaxy IC342 with narrow band [SII] and H filters. II - Detection of 16 Optically-Identified Supernova Remnant Candidates
M. M. Vucetic, A. Ciprijanovic, M. Z. Pavlovic +4
We present the detection of 16 optical supernova remnant (SNR) candidates in the nearby spiral galaxy IC342. The candidates were detected by applying [SII]/H ratio criterion on…
Multi-band optical-NIR variability of blazars on diverse timescales
Aditi Agarwal, Alok C. Gupta, R. Bachev +10
To search for optical variability on a wide range of timescales, we have carried out photometric monitoring of two flat spectrum radio quasars, 3C 454.3 and 3C 279, plus one BL Lac…
Optical observations of the nearby galaxy IC342 with narrow band [SII] and H filters. I
M. M. Vucetic, B. Arbutina, D. Urosevic +4
We present observations of the portion of the nearby spiral galaxy IC342 using narrow band [SII] and H filters. These observations were carried out in November 2011 with the 2m…
Spectroscopic and physical parameters of Galactic O-type stars. II. Observational constraints on projected rotational and extra broadening velocities as a function of fundamental parameters and stellar evolution
N. Markova, J. Puls, S. Simón-Díaz +3
Rotation is of key importance for the evolution of hot massive stars, however, the rotational velocities of these stars are difficult to determine. Based on our own data for 31 Gal…
Spectroscopic and physical parameters of Galactic O-type stars. I. Effects of rotation and spectral resolving power in the spectral classification of dwarfs and giants
N. Markova, J. Puls, S. Scuderi +2
The modern-era spectral classification of O-stars relies on either the Walborn or the Conti-Mathys scheme. Since both of these approaches have been developed using low-quality phot…
The open cluster Berkeley 53
G. Maciejewski, B. Mihov, Ts. Georgiev
We present a photometric study of the neglected open cluster Berkeley 53. We derived its fundamental parameters, such as the age, the interstellar reddening, and the distance from…