A5056186336- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Scientific Research and Discoveries
- Dark Matter and Cosmic Phenomena
- Astrophysics and Star Formation Studies
- Adaptive optics and wavefront sensing
- Astronomical Observations and Instrumentation
- History and Developments in Astronomy
- Computational Physics and Python Applications
- Impact of Light on Environment and Health
- Astrophysics and Cosmic Phenomena
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- Spectroscopy and Laser Applications
- Advanced Research in Science and Engineering
- Blind Source Separation Techniques
- Remote Sensing in Agriculture
- Technology Assessment and Management
- Radio Astronomy Observations and Technology
- Neutrino Physics Research
- International Science and Diplomacy
- Advanced MRI Techniques and Applications
Astronomical Observatory
2012-2024
University of Belgrade
2010-2012
Ben-Gurion University of the Negev
2009
University of Trieste
1999-2006
National Institute for Astrophysics
2006
Isaac Newton Institute
2005
Trieste Astronomical Observatory
1999-2005
The Abdus Salam International Centre for Theoretical Physics (ICTP)
2001
National Observatory
1995-1996
Urban Observatory of Belgrade (UrbObsBel) is a project hosted by Astronomical Belgrade. Our main aim to study, applying well-tested astronomical techniques, light pollution and dynamical processes the Serbian capital, observations will provide valuable information on energy usage distribution that has high impact environment ecosystems. We have already mounted we are also planning mount several observational instruments covering spectral range from visible (400 nm) infrared (13 micron), use...
We present the 3-year project of Urban Observatory Belgrade, funded by Science Fund Republic Serbia, a new observing station within Astronomical Serbia. One main goals is to measure and study one least understood forms pollution on Earth, light pollution. also plan perform observations which will provide information distribution energy consumption, has major impact environment ecosystems. Our measure- ments be made in Belgrade from Vidojevica Station near Prokuplje run few remaining dark...
Context. The departures from Newtonian dynamics based on the mass-follows-light approach discovered in outer parts of some early-type galaxies imply existence dark matter and/or necessary modifications to approach. We study dynamical models a sample ten both and MOND approaches.
We analyse long-slit spectra of four early-type galaxies which extend from ∼1 to 3 effective radii: IC 1459; 3370; NGC 3379 and 4105. have extracted the full line-of-sight velocity distribution (in case we also used data literature), model using two-integral approach. Using modelling, find no strong evidence for dark haloes, but fits suggest that three-integral modelling is necessary. inferred constant mass-to-light ratio in all cases typical galaxies. Finally, discuss constraints on ratio,...
(abridged) Context. Gravitational fields at the outskirts of early-type galaxies (ETGs) are difficult to constrain observationally. It thus remains poorly explored how well LCDM and MOND hypotheses agree with ETGs. Aims. This led us gather a large sample ETGs examine homogeneously which dark matter halos they occupy, whether follow theoretically predicted stellar-to-halo mass relation (SHMR) halo mass-concentration (HMCR), obey radial acceleration (RAR) observed for late-type (LTGs), finally...
We use the two-point correlation function in redshift space, ξ(s), to study clustering of galaxies and groups Nearby Optical Galaxy (NOG) sample, which is a nearly all-sky (|b| > 20°), complete, magnitude-limited sample ~7000 bright nearby optical (cz ≤ 6000 km s-1). The well described by power law, ξ(s) = (s/s0)-γ, with slope γ ~ 1.5 s0 6.4 h-1 Mpc (on scales 2.7-12 Mpc), substantial agreement previous results several surveys galaxies. Splitting NOG into different morphological subsamples,...
Context: Regarding the significant interest in both dark matter and application of MOND to early-type galaxies, we investigate theory by comparing its predictions, for models constant mass-to-light ratio, with observational data galaxy NGC 4649. Aims: We study whether measurements 3379 1399 are typical systems test assumption a Newtonian M/L ratio underlying most published models. Methods: employ globular clusters 4649 as mass tracer. The Jeans equation is calculated assumptions. Spherical...
Aims. We investigate the predictions of Newtonian dynamics and MOND theory related to Milky Way galaxy using Jeans equation.
Abstract To understand the origin of extended disks low-surface brightness (LSB) galaxies, we studied in detail four such systems with large seen edge on. Two them are edge-on giant LSB galaxies (gLSBGs) recently identified by our team. The orientation these boosts their surface brightnesses that provided an opportunity to characterize stellar populations spectroscopically and yielded first measurements for gLSBGs. We collected deep images one galaxy using 1.4 m Milanković Telescope, which...
Context.Of the various observational methods used to address question of dark matter in early-type galaxies there is possibility spatial overlap using kinematics stars, clusters and X-ray halos.
<i>Context. <i/>The existence and amount of dark matter in early-type galaxies remains a hotly debated topic. We study dynamical models NGC 5128, which do not include matter, to test the predictions different constant mass-to-light models. <i>Aims. <i/>We use measurements radial velocities planetary nebulae 5128 Newtonian ratio we also extend our MOND <i>Methods. were used as tracer galaxy's gravitational potential. The Jeans equation was calculated for both mass-follows-light approaches....
We study the well-known nearby early-type galaxy NGC 5128 (Centaurus A) and use sample of its globular clusters to analyze dynamics. both Newtonian MOND models assuming three cases orbital anisotropies: isotropic case, mildly tangentially anisotropic case radially based on literature. find that there are two regions with different values velocity dispersion: interior ~ 3 effective radii value dispersion is approximately 150 km s?1 , whereas beyond increases 190 thus implying increase total...
We report that the density profiles of globular cluster (GC) systems in a sample 17 early-type galaxies (ETGs) show breaks at radii where gravitational acceleration exerted by stars equals galactic scale $a_0$ known from radial relation or MOND. The match with other characteristic galaxy is not close. propose possible explanations frameworks $\Lambda$CDM model and find tentative evidence context, GCs reveal only masses dark halos through richness GC but also concentrations break systems.
The estimates of the mass galaxy NGC 5128 based on different tracers, globular clusters (GCs) and planetary nebulae (PNe), are presented. These compared with estimate X-ray methodology it is found that results for (and mass-to-light ratio) all three approaches in very good agreement interior to 25 arcmin; beyond arcmin X-rays predict which too high respect one using GCs PNe. Some possible explanations this discrepancy were discussed. Jeans equation also solved its predictions velocity...
We discuss the tight interconnection between microlensing optical depths, flattening of dark haloes and low-to-intermediate redshift baryonic census. By analysing plots depth as a function Galactic coordinates for different values axis ratio q MACHO halo, we have shown that observations are best described by flattened halo with q≃0.6. There is no dynamical obstacle such choice global shape. Both extremely q≃0.2 spherical q≃1 several difficulties, although not equal severity. Consequences...
Context. The existence of dark matter in some early-type galaxies is well-established. We address one such case and study dynamical models NGC 4472 by means using both Newtonian MOdified Dynamics (MOND) approaches with particular emphasis on the latter.
Recent highly sensitive detections of line emission from extended gas in the local Universe demonstrate feasibility detecting H α-emitting galactic haloes out to z ∼ 1. We determine form surface brightness versus redshift dependence, which takes into account UV background evolution. Successful will have a major impact on wide range fields, particular source ionization QSO absorption systems.
Context. We present the largest catalog of detailed stellar kinematics central parts nearby galaxies, which includes higher moments line-of-sight velocity distribution (LOSVD) function represented by Gauss-Hermite series. The is measured on a sample galaxies selected from Arecibo Legacy Fast ALFA (Alfalfa) survey using spectroscopy Sloan Digital Sky Survey (SDSS DR7).
Dark matter is required in galaxies at galactocentric radii that are larger than the $a_0$-radius, which where gravitational acceleration generated by baryons of galaxy equals constant $a_0=1.2\times 10^{-10}$ms$^{-2}$ known as galactic scale. It was found previously for massive early-type radial number-density profiles their globular cluster (GC) systems follow broken power laws and breaks occur $a_0$-radii. We have newly analyzed distribution GCs around Fornax existing photometric...
To understand the origin of extended disks low-surface brightness (LSB) galaxies, we studied in detail 4 such systems with large seen edge-on. Two them are edge-on giant LSB galaxies (gLSBGs) recently identified by our team. The orientation these boosts their surface brightnesses that provided an opportunity to characterize stellar populations spectroscopically and yielded first measurements for gLSBGs. We collected deep images one galaxy using 1.4-m Milankovi\'c Telescope which combined...
We present the project of Urban Observatory Belgrade, funded by Science Fund Republic Serbia, a new observing station within Astronomical Serbia. One main goals is to measure and study one least understood forms pollution on Earth, light pollution. also plan perform observations which will provide information distribution energy consumption, has major impact environment ecosystems. Our measurements be made in Belgrade from Vidojevica Station near Prokuplje run few remaining dark areas The...
Urban Observatory of Belgrade (UrbObsBel) is a project hosted by Astronomical Belgrade. Our main aim to study, applying well-tested astronomical techniques, light pollution and dynamical processes the Serbian capital, observations will provide valuable information on energy usage distribution that has high impact environment ecosystems. We already mounted or plan mount several observational instruments covering spectral range from visible (400 nm) infrared (13 micron), use both broadband...
Abstract. We present the statistic of observing time used at Astronomical Station Vidojevica (ASV) from its opening in 2011 to current year. analyze separately first period, 2011-2018, when only Nedeljković telescope (0.60 m) was available and second 2018-2023, also observations with Milanković (1.40 were performed. The year 2018 marks beginning public calls for ASV reviewing received observational proposals by Time Allocation Committee (TAC). Finally, we briefly scientific output produced...