Resercher Profiles


Dr. Olga Melnyk, Astrophysicist

olga


Objects of Interest

  • Extragalactic astronomy that deals with large-scale structures of the Universe, multiwavelength properties of galaxies and active galactic nuclei (AGN) and dynamical properties of galaxy groups
  • Studies of the physical properties of X-ray selected AGN, their host galaxies and their environments


Current Research Positions

  • Research visitor at the Department of Astronomy and Astrophysics, the University of Bologna, Italy
  • Researcher at the Astronomical Observatory, Taras Schevchenko National University of Kyiv, Ukraine


Postdoctoral Research Experiences, 2003 – Present


Publications in main refereed journals

  • Koulouridis E., Plionis M., Melnyk O., Elyiv A., Georgantopoulos I., Clerc N., Surdej J., Chiappetti L., Pierre M. X-ray AGN in the XMM-LSS galaxy clusters: no evidence of AGN suppression. Accepted for publication in A&A (arXiv:1402.4136)
  • Melnyk O., Mitronova S., Karachentseva V. E. Colours of isolated galaxies selected from the Two-Micron All-Sky Survey. MNRAS, 2014, 438, 548.
  • Elyiv A., Melnyk O., Finet F., Pospieszalska-Surdej A., Chiappetti L., Pierre M., Sadibekova T., Surdej J., Gravitational lens candidates in the XMM-LSS field. MNRAS, 2013, 434, p.3305.
  • Melnyk O., Plionis M., Elyiv A., Salvato M., Chiappetti L., Clerc N., Gandhi P., Pierre M., Sadibekova T., Pospieszalska-Surdej A., Surdej J. Classification and environmental properties of X-ray selected point-like sources in the XMM-LSS field. A&A, 557, id.A81, pp. 14.
  • Chiappetti L., Clerc N., Pacaud F., Pierre M., Gueguen A., Paioro L., Polletta M., Melnyk O., Elyiv A., Surdej J., Faccioli L. The XMM-Large Scale Structure catalogue - II. X-ray sources and associated multiwavelength data. MNRAS, 2013, Vol. 429, pp.1652-1673.
  • Elyiv A., Clerc N., Plionis M., Surdej J., Pierre M., Basilakos S., Chiappetti L., Gandhi P., Gosset E., Melnyk O., Pacaud F. Angular correlation functions of X-ray point-like sources in the full exposure XMM-LSS field. A&A, 2012, Vol. 537, id.A131.
  • Elyiv A., Melnyk O., Vavilova I. High-order 3D Voronoi tessellation for identifying Isolated galaxies, Pairs and Triplets. MNRAS, 2009, Vol. 394, pp. 1409-1418.


Publications in other refereed journals

  • Karachentseva V.E., Melnyk O., Karachentsev I.D. Star formation rates in nearby Markarian galaxies. Astrophysics. 2014, 57, 1.
  • Karachentsev I.D., Karachentseva V.E., Melnyk O., Courois H. M. Star formation in nearby isolated galaxies. Astrophysical Bulletin. 2013, vol.68, p.270.
  • Elyiv A., Karachentsev I. D., Karachentseva V. E., Melnyk O. V., Makarov D. I. Low Density Structures in the Local Universe. II. The nearest cosmic voids. Astrophysical Bulletin. 2013, Vol. 68, pp.1-12.
  • Melnyk O. V., Dobrycheva D. V., Vavilova I. B. Morphology and color indices of galaxies in pairs: Criteria for the classification of galaxies. Astrophysics, 2012, Vol. 55, pp. 293-305.
  • Karachentsev I. D., Karachentseva V. E., Melnyk O. V., Elyiv A. A., Makarov D. I. Low Density Structures in the Local Universe. I. Diffuse Agglomerates of Galaxies. Astrophysical Bulletin, 2012, Vol. 67, pp.353-361.
  • Karachentseva V. E., Karachentsev I. D., Melnyk O. V. Faint companions of isolated 2MIG galaxies. Astrophysical Bulletin, 2011, Vol. 66, pp.389-406.
  • Karachentsev I. D., Makarov D. I., Karachentseva V. E., Melnyk O. V. Catalog of nearby isolated galaxies in the volume z < 0.01. Astrophysical Bulletin, 2011, Vol. 66, pp.1-27.
  • Karachentseva V.E., Mitronova S.N.,.Melnyk O.V., Karachentsev I.D. Catalog of isolated galaxies selected from the 2MASS survey. Astrophysical Bulletin, 2010, Vol. 65, pp.1-17.
  • Melnyk O. V., Karachentseva V. E., Karachentsev I. D., Makarov D. I., Chilingarian I. V. Astrophysics, 2009, Vol. 52, pp.184-191.
  • Vavilova I. B., Melnyk O. V., Elyiv A. A. Morphological properties of isolated galaxies vs. isolation criteria. Astronomische Nachrichten, 2009, Vol. 330, pp.1004-1009.
  • Melnyk O., Elyiv A., Vavilova I. Mass-to-Luminosity relation for galaxy pairs and triplets in the different environment. Kinematics and Physics of Celestial Bodies, 2009, Vol. 25, pp. 64-71.
  • Karachentsev I.D., Makarov D.I., Karachentseva V.E., Melnik O. (Melnyk O.V.) Optical identification for 230 HIPASS sources. Astronomy Letters, 2008, Vol. 34, pp. 832-838.
  • Melnyk O.V., Vavilova I.B. Dark matter in very poor galaxy groups. Advances in Space Reseach, 2008, Vol. 42, pp. 591-595.
  • Melnyk O. V., Vavilova I. B. Triplets of Galaxies in the Local Supercluster. 3. Configurational properties. Kinematics and Physics of Celestial Bodies, 2006, Vol. 22, pp. 422-431.
  • Melnyk O. V. Interacting galaxies in sparsely populated groups. Astronomy Letters, 2006, Vol. 32, pp.302-307.
  • Melnyk O. V., Elyiv, A. A., Vavilova I. B. The structure of the Local Supercluster of galaxies detected by three-dimensional Voronoi's tessellation method. Kinematics and Physics of Celestial Bodies, 2006, Vol. 22, pp. 283-296.
  • Vavilova I., Melnik O. (Melnyk O.) Voronoi tessellation for galaxy distribution. Mathematics and its Applications, 2005, Vol. 55, pp. 203-212.
  • Karachentseva V. E., Melnyk O. V., Vavilova I. B., Makarov D. I. Triplets of Galaxies in the Local Supercluster. 2. Virial masses and sum of individual masses. Kinematics and Physics of Celestial Bodies, 2005, Vol. 21, pp. 217-230.
  • Vavilova I. B., Karachentseva V. E., Makarov D. I., Melnyk O. V. Triplets of Galaxies in the Local Supercluster. I. Kinematic and Virial Parameters. Kinematics and Physics of Celestial Bodies, 2005, Vol. 21, pp. 1-16.


Full publication list

Full publication list is here


Dr. Andrii Elyiv, Astrophysicist

andrii


Objects of Interest

  • Large-Scale Structure studies
    Universe mapping: low-density structures studies in the Local Universe, development of void identification algorithms; application of Voronoi tessellation methods for the identifications of galaxy groups.
    Correlation function analysis of X-ray selected AGN.
  • Optical astronomy
    Optical images proceeding, namely development and applying of the fitting methods for the photometry of gravitational lens in the frame of MiNDSTEp project.
    Construction of numerical tool for the morphological studies of the AGN optical counterparts and searching of gravitational lens candidates in XXL field.
  • High energy astrophysics
    Ultra High Energy Cosmic Rays propagation and their spectrum formations in galactic and extragalactic magnetic fields.
    Numerical simulations of electromagnetic cascades and gamma-ray emission from TeV Blazars.
    Problems of how the magnetic field and Extragalactic Background Light in voids are influencing the stability of electromagnetic cascades.


Current Research Positions

  • Postdoc researcher at the Department of Astronomy and Astrophysics, the University of Bologna, Italy


Postdoctoral Research Experiences, 2003 – Present

  • Euclid collaboration , member of working group “galaxy clustering”, 2014 - present
  • ESA PRODEX Program “XXL survey: The ultimate 50 deg2 XMM extragalactic medium deep X-ray survey”, 2009 – present
  • The MiNDSTEp (Microlensing Network for the Detection of Small Terrestrial Exoplanets) collaboration, 2012 – 2013
  • Ukrainian-Russian collaboration for project “Diffuse agglomerations and voids in the Local Universe”, 2011 – 2013
  • Swiss National Science Foundation and the Swiss Agency for Development and Cooperation in the framework of the program SCOPES for organization “Virtual Roentgen and Gamma-ray Observatory (VIRGO.UA)”, 2005 – 2008
  • “Investigation of early Universe, dark matter and dark energy,” the investigation project sponsored by the National Academy of Sciences of Ukraine, 2007 – 2008
  • “Nature of the Ultra High Energy Cosmic Rays Sources,” the investigation project supported by the Ukrainian State Fund for Fundamental Research, 2002 – 2006


Methods and Computing

  • Photometry of optical observations, image analysis
  • Large Scale structure analysis (Voronoi tessellation, friend-of-friend method)
  • Statistical methods, working with large databases
  • Correlation function analysis, Numerical simulation methods, Monte-Carlo modeling
  • Object Pascal, C++ programming
  • Astronomical software packages: FTOOLS, DS9, XSPEC, WCStools etc.
  • Linux, Windows operating systems, Office programs, LaTeX, gnuplot, etc.


Publications (Updated January 31, 2014)

  • 15 papers in main refereed journals
  • 12 papers in other refereed journals
  • 4 papers in non-refereed journals


Most Important Articles