Sergey Drozdov

@asc-lebedev.ru

Department Theoretical astrophysics and cosmology
Astro Space Center of PN Lebedev Physics Institute

Sergey Drozdov


            Download Compact PDF  
https://researchid.co/olmerhuelmer

EDUCATION

Moscow State University, Faculty of Physics

RESEARCH, TEACHING, or OTHER INTERESTS

Astronomy and Astrophysics
11

Scopus Publications

Scopus Publications

  • Interstellar Medium in Extremely High Star-Formation Regions: A Prospect of Observations on the Millimetron Space Observatory
    E. O. Vasiliev, S. A. Drozdov, P. V. Baklanov, O. P. Vorobyov, S. Yu. Dedikov, et al.
    Astronomy Reports, 2025
  • Far-Infrared Emission from a Late Supernova Remnant in an Inhomogeneous Medium
    S. A. Drozdov, S. Yu. Dedikov, E. O. Vasiliev
    Astrophysical Bulletin, 2025
  • Origin and transport of water in the Universe
    Maria S. Kirsanova, P.V. Baklanov, Evgeniy O. Vasiliev, Anton I. Vasyunin, Dmitry Z. Wiebe, et al.
    Physics Uspekhi, 2025
  • Galaxies at and New Opportunities for Testing Cosmological Models
    S. V. Pilipenko, S. A. Drozdov, M. V. Tkachev, A. G. Doroshkevich
    Astrophysical Bulletin, 2024
  • Dust-free starburst galaxies at redshifts z > 10
    Biman B Nath, Evgenii O Vasiliev, Sergey A Drozdov, Yuri A Shchekinov
    Monthly Notices of the Royal Astronomical Society, 2023
    One of the most distant galaxies GN-z11 was formed when the Universe was ≤400 Myr old, and it displays a burst-like star formation rate ∼25 M⊙ yr−1 with a metallicity Z ∼ 0.2 ± 0.1 Z⊙. It resembles z = 2–3 galaxies (at ‘cosmic noon’) except for the fact that the measured reddening E(B − V) = 0.01 ± 0.01 indicates the presence of little or no dust. This marked absence of dust hints towards violent dynamical events that destroy or evacuate dust along with gas out of the galaxy on a relatively short time-scale and make it transparent. We apply a 3D numerical model to infer possible physical characteristics of these events. We demonstrate that the energetics of the observed star formation rate is sufficient to tear apart the dusty veil on time-scales of 20–25 Myr. This can explain the apparent lack of evolution of ultraviolet luminosity function of galaxies between z ≥ 10 and z ∼ 7, by compensating for the lower galaxy masses at higher redshift by the absence of dust. We show, however, that this is a temporary phenomenon and soon after the last of the supernovae explosions have taken place, the expanding shell shrinks and obscures the galaxy on time-scales of ≈5–8 Myr.
  • Disc-halo gas outflows driven by stellar clusters as seen in multiwavelength tracers
    Evgenii O Vasiliev, Sergey A Drozdov, Biman B Nath, Ralf-Jürgen Dettmar, Yuri A Shchekinov
    Monthly Notices of the Royal Astronomical Society, 2023
    We consider the dynamics of and emission from growing superbubbles in a stratified interstellar gaseous disc driven by energy release from supernovae explosions in stellar clusters with masses Mcl = 105 − 1.6 × 106 M⊙. Supernovae are spread randomly within a sphere of rc = 60 pc, and inject energy episodically with a specific rate $1/130~\\mathrm{M}_\\odot ^{-1}$ proportional to the star formation rate (SFR) in the cluster. Models are run for several values of SFR in the range 0.01 to 0.1 M⊙ yr−1, with the corresponding average surface energy input rate ∼0.04–0.4 erg cm−2 s−1. We find that the discrete energy injection by isolated SNe are more efficient in blowing superbubbles: Asymptotically they reach heights of up to 3 to 16 kpc for Mcl = 105 − 1.6 × 105 M⊙, correspondingly, and stay filled with a hot and dilute plasma for at least 30 Myr. During this time, they emit X-ray, Hα and dust infrared emission. X-ray luminosities LX∝SFR3/5 that we derive here are consistent with observations in star-forming galaxies. Even though dust particles of small sizes a ≤ 0.03 μm are sputtered in the interior of bubbles, larger grains still contribute considerably ensuring the bubble luminosity $L_{\\rm IR}/{\\rm SFR}\\sim 5\\times 10^7 \\, \\mathrm{L}_\\odot \\, \\mathrm{M}_\\odot ^{-1} ~{\\rm yr}$. It is shown that the origin of the North Polar Spur in the Milky Way can be connected with activity of a cluster with the stellar mass of ∼105 M⊙ and the SFR ∼ 0.1 M⊙ yr−1 some 25–30 Myr ago. Extended luminous haloes observed in edge-on galaxies (NGC 891 as an example) can be maintained by disc spread stellar clusters of smaller masses M* ≲ 105 M⊙.
  • Hα emission from gaseous structures above galactic discs
    Evgenii O. Vasiliev, Sergey A. Drozdov, Yuri A. Shchekinov
    Open Astronomy, 2022
    Extraplanar structures of ionized gas are detected in numerous edge-on galaxies. Whether HII regions or supernovae (SNe) responsible for its ionization is still debated. Here, we consider the H α {\\rm{H}}\\alpha emissivity from shells of superbubbles driven by SNe explosions in a stellar cluster located either in the midplane or above the midplane of the disc. We found that these shells form filamentary structures emitting brightly in H α {\\rm{H}}\\alpha line at height of ∼ 0.6 \\sim 0.6 – 1.6 kpc 1.6\\hspace{0.33em}{\\rm{kpc}} above the disc depending on cluster location and gas metallicity. The H α {\\rm{H}}\\alpha surface brightness ranges within ∼ 1 0 − 17 \\sim 1{0}^{-17} – 1 0 − 16 erg s − 1 cm − 2 arcsec − 2 1{0}^{-16}\\hspace{0.33em}{\\rm{erg}}\\hspace{0.33em}{{\\rm{s}}}^{-1}\\hspace{0.33em}{{\\rm{cm}}}^{-2}\\hspace{0.33em}{{\\rm{arcsec}}}^{-2} are close to the values observed in edge-on galaxies. We conclude that the H α {\\rm{H}}\\alpha emission of extraplanar structures can be explained by recombination in collisionally ionized gas of unstable shells driven by multiple SNe.
  • Bubbles and OB associations
    Sergey A. Drozdov, Evgenii O. Vasiliev, Marina V. Ryabova, Yuri A. Shchekinov, Biman B. Nath
    Open Astronomy, 2022
    Supernovae explosions (SNe) in a stratified interstellar disc can create large scale structures and outflows perpendicular to the disc. Their morphology and emission characteristics depend on interrelations between the number of exploded SNe, the ISM vertical scale height, the height above the ISM disc at which SNe are located, and the mid-plane density of ambient gas. When observed such out-of-plane gas structures do characterize properties of the driving SNe and reveal the presence of underlying stellar clusters. Even though the morphology and emission properties of such structures are sensitive to characteristics of ambient gas they might be used for rough estimates of the clusters’ mass.
  • Dust Destruction in Hot Gas Dynamic Flows
    S. A. Drozdov, E. O. Vasiliev
    Bulletin of the Lebedev Physics Institute, 2021
  • Emission Spectrum of Dust in a Cooling Gas
    S. A. Drozdov
    Astrophysics, 2021
  • Temperature of Dust in Hot Plasmas
    S. A. Drozdov, Yu. A. Shchekinov
    Astrophysics, 2019