Article
Astronomy & Astrophysics
J. M. Pittard, M. M. Kupilas, C. J. Wareing
Summary: We investigate the resolution dependence of H II regions expanding past their Stromgren spheres. We find that if the Stromgren radius is resolved with certain conditions, the structure, size, and radial momentum of the regions at a given time are in good agreement with analytical expectations. Otherwise, the radial momentum may be over- or underestimated by factors up to 10 or more. Our work is significant for understanding the amount of radial momentum and the relative importance of ionizing feedback from massive stars in numerical simulations.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Oleg Egorov, Tatiana A. Lozinskaya, Konstantin Vasiliev, Anastasiya D. Yarovova, Ivan S. Gerasimov, Kathryn Kreckel, Alexei Moiseev
Summary: The study presents the results of a multiwavelength analysis of the nearby dwarf galaxy DDO 53, revealing a large ionized gas supershell and anomalous H I features in the north part of the galaxy. These findings suggest a connection with gas accretion from the intergalactic medium or a past merger event, impacting on the star formation activity in the brightest region of DDO 53.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Ivan S. Gerasimov, Oleg Egorov, Tatiana A. Lozinskaya, Alexei Moiseev, Dmitry Oparin
Summary: Feedback from massive stars has significant impacts on the interstellar medium and galaxy evolution. However, the mechanisms of feedback at small scales, especially in low-metallicity environments, remain poorly understood observationally. This study analyzes the ionized gas in the nearby star-forming galaxy Sextans A and its connection to massive stars. The results reveal expanding superbubbles of ionized gas and provide evidence of feedback from supernovae and the pre-supernova phase.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
J. Garcia-Vazquez, William J. Henney, H. O. Castaneda
Summary: We conducted a statistical analysis of the Hα velocity field in a diverse sample of HII regions, extracting three fundamental parameters: velocity dispersion, correlation length, and power-law slope. The plane-of-sky velocity dispersion was found to be a better indicator of turbulent motions, especially for low luminosity regions. The correlation length of velocity fluctuations was always approximately 2% of the HII region diameter, suggesting turbulence is driven on small scales. No evidence for steepening of the structure function was found in the transition from subsonic to supersonic turbulence, possibly due to projection smoothing. Ionized density fluctuations were larger than expected, indicating turbulence alone cannot explain them. Only a minority of sources showed evidence for homogeneity on the largest scales.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Lauren H. Cooke, Rebecca C. Levy, Alberto D. Bolatto, Joshua D. Simon, Andrew B. Newman, Peter Teuben, Brandon D. Davey, Melvyn Wright, Elizabeth Tarantino, Laura Lenkic, Vicente Villanueva
Summary: Rotation curves of spiral dwarf galaxies were examined using ALMA, and it was found that these relatively massive dwarfs have steeper dark matter density profiles than predicted by simulations. This suggests the possibility of stronger gas inflows, overestimate of accretion or feedback events in the simulations, or a combination of these effects.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
M. Sanchez-Cruces, M. Rosado
Summary: We analysed the ionized gas kinematics of the dwarf galaxy NGC 4214 using high resolution Fabry-Perot interferometry observations and obtained velocity field, velocity dispersion, and rotation curve. We also analysed the kinematics of two new superbubbles and previously detected supernova remnants in this galaxy. By fitting velocity profiles, we calculated the expansion velocities and physical parameters of these structures.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
A. Amayo, G. Delgado-Inglada, G. Stasinska
Summary: New ionization correction factors (ICFs) for carbon, nitrogen, neon, sulfur, chlorine, and argon in giant Hii regions were provided in this study. The ICFs were computed using representative photoionization models from a large initial grid, and were used to calculate abundances of nitrogen, neon, sulfur, and argon in samples. Oxygen depletion into dust grains at a rate increasing with metallicity was found, and the discussion on possible depletion of sulfur and argon requires consideration of recent Type Ia Supernova yields, which are uncertain.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. Sanchez-Cruces, M. M. Sardaneta, I Fuentes-Carrera, M. Rosado, N. Cardenas-Martinez, M. A. Lara-Lopez
Summary: In this study, we used Fabry-Perot observations to investigate the kinematics of NGC 1569 and computed its H alpha velocity field. Our analysis identified the origin of most motions in the galaxy and ruled out the possibility of deriving a rotation curve. We also analyzed the kinematics of supernova remnants in NGC 1569 and determined their physical properties.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Sarah M. R. Jeffreson, Mark R. Krumholz, Yusuke Fujimoto, Lucia Armillotta, Benjamin W. Keller, Melanie Chevance, J. M. Diederik Kruijssen
Summary: A novel physically motivated sub-grid model for Hii region feedback is presented, which shows that the injection of momentum has a significant impact on the ratio of cold and molecular gas, as well as decreasing the mass-loading of galactic outflows. The simulations indicate that the characteristic lifetime of the least-massive molecular clouds is reduced, while the lifetimes of intermediate-mass clouds are elongated.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
M. Querejeta, F. Lelli, E. Schinnerer, D. Colombo, U. Lisenfeld, C. G. Mundell, F. Bigiel, S. Garcia-Burillo, C. N. Herrera, A. Hughes, J. M. D. Kruijssen, S. E. Meidt, T. J. T. Moore, J. Pety, A. J. Rigby
Summary: Tidal dwarf galaxies (TDGs) are condensations of gas and stars formed during galaxy interactions. The ALMA observations of J1023+1952 in the interacting system Arp 94 showed a high fraction of extended molecular emission and GMC properties similar to the Milky Way. Star formation occurs predominantly in the south of the TDG, with more molecular clouds and higher molecular-to-atomic gas ratio in the quiescent north.
ASTRONOMY & ASTROPHYSICS
(2021)
Article
Astronomy & Astrophysics
A. Marasco, F. Belfiore, G. Cresci, F. Lelli, G. Venturi, L. K. Hunt, A. Concas, A. Marconi, F. Mannucci, M. Mingozzi, A. F. McLeod, N. Kumari, S. Carniani, L. Vanzi, M. Ginolfi
Summary: By observing and modeling a sample of 19 galaxies with stellar masses ranging from 10⁷ to 10¹⁰ solar masses, it is found that the ionized gas in these galaxies exhibits non-circular motion and low mass outflow rates, which significantly deviate from the predictions of theoretical models. This suggests that baryonic feedback plays a gentle gas cycling role rather than causing large-scale blow-outs in low-mass galaxies.
ASTRONOMY & ASTROPHYSICS
(2023)
Article
Astronomy & Astrophysics
Philip F. Hopkins, Anna L. Rosen, Jonathan Squire, Georgia Panopoulou, Nadine H. Soliman, Darryl Seligman, Ulrich P. Steinwandel
Summary: This study presents the first simulations of radiation-dust driven outflows in stratified, inhomogeneous media. The results show that dust plays a crucial role in the gas dynamics, leading to size-dependent dust clustering and unique nebular morphologies.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
F. Mannucci, F. Belfiore, M. Curti, G. Cresci, R. Maiolino, A. Marasco, A. Marconi, M. Mingozzi, G. Tozzi, A. Amiri
Summary: The diffuse ionized gas has an impact on the nebular emission of galaxies, but the effect may be lower than previously assumed, and aperture effects play a significant role in observed differences. Correction may be needed in observed data to recover the genuine contribution from H II regions, and this has implications for measuring metallicity using strong-line methods.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Astronomy & Astrophysics
Rachel Buttry, Andrew B. Pace, Sergey E. Koposov, Matthew G. Walker, Nelson Caldwell, Evan N. Kirby, Nicolas F. Martin, Mario Mateo, Edward W. Olszewski, Else Starkenburg, Carles Badenes, Christine Mazzola Daher
Summary: In this study, we present new spectroscopic measurements for 257 stars observed along the line of sight to the dwarf galaxy Triangulum II (Tri II) and develop a methodology to infer the binary orbital parameters of the stars. However, the current data is still insufficient to resolve the velocity dispersion of Tri II.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Astronomy & Astrophysics
Fabian Scheuermann, Kathryn Kreckel, Ashley T. Barnes, Francesco Belfiore, Brent Groves, Stephen Hannon, Janice C. Lee, Rebecca Minsley, Erik Rosolowsky, Frank Bigiel, Guillermo A. Blanc, Mederic Boquien, Daniel A. Dale, Sinan Deger, Oleg Egorov, Eric Emsellem, Simon C. O. Glover, Kathryn Grasha, Hamid Hassani, Sarah M. R. Jeffreson, Ralf S. Klessen, J. M. Diederik Kruijssen, Kirsten L. Larson, Adam K. Leroy, Laura A. Lopez, Hsi-An Pan, Patricia Sanchez-Blazquez, Francesco Santoro, Eva Schinnerer, David A. Thilker, Bradley C. Whitmore, Elizabeth J. Watkins, Thomas G. Williams
Summary: Connecting the gas in H II regions to the underlying ionizing radiation source helps us understand stellar feedback and the evolution of H II regions. Using PHANGS-MUSE, we detect and measure physical properties of nearly 24,000 H II regions across 19 galaxies. By analyzing associations with ionizing sources, we find correlations between association ages and various properties, suggesting an evolutionary sequence. We also observe correlations with local metallicity variations, indicating preferential star formation in metal-rich areas.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2023)
Article
Astronomy & Astrophysics
Evgeniya S. Egorova, Alexei V. Moiseev, Oleg V. Egorov
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2019)
Article
Astronomy & Astrophysics
Oleg V. Egorov, Alexei V. Moiseev
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2019)
Article
Astronomy & Astrophysics
M. M. Vucetic, D. Ilic, O. Egorov, A. Moiseev, D. Onic, T. G. Pannuti, B. Arbutina, N. Petrov, D. Urosevic
ASTRONOMY & ASTROPHYSICS
(2019)
Article
Astronomy & Astrophysics
Tatiana S. Bryukhareva, Alexei V. Moiseev
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2019)
Article
Astronomy & Astrophysics
L. C. Popovi, V. L. Afanasiev, A. Moiseev, A. Smirnova, S. Simic, Dj Savic, E. G. Mediavilla, C. Fian
ASTRONOMY & ASTROPHYSICS
(2020)
Article
Astronomy & Astrophysics
I Proshina, O. Sil'chenko, A. Moiseev
ASTRONOMY & ASTROPHYSICS
(2020)
Article
Astronomy & Astrophysics
O. Sil'chenko, A. Moiseev
ASTRONOMY & ASTROPHYSICS
(2020)
Article
Astronomy & Astrophysics
S. A. Hakopian, S. N. Dodonov, A. Moiseev, A. A. Smirnova
Article
Astronomy & Astrophysics
Erin Darnell Knese, William C. Keel, Greg Knese, Vardha N. Bennert, Alexei Moiseev, Aleksandra Grokhovskaya, Sergei N. Dodonov
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2020)
Article
Astronomy & Astrophysics
Alexei V. Moiseev, Alina I. Ikhsanova
Summary: New results on the Teacup galaxy (SDSSJ1430+1339), a radio-quiet type 2 quasar, were obtained from long-slit and 3D spectroscopic data obtained at the Russian 6-m telescope. The ionized gas giant nebula, extending up to r = 56 kpc in the [O III] emission line, was confirmed to be ionized by the AGN through direct emission line ratio estimation. The starburst age of the central region, around 1 Gyr, is consistent with possible galactic merger events and the quasar outflow producing symmetric arcs in the [O III] emission.
Article
Optics
Irina Afanasieva, Valery Murzin, Valery Ardilanov, Nikolai Ivaschenko, Maksim Pritychenko, Alexei Moiseev, Elena Shablovinskaya, Eugene Malygin
Summary: In this study, we present the design, implementation, and operation principles of an astronomical camera system based on a large-format CCD261-84 detector with a thick 200 μm substrate. The use of the DINACON-V controller with the CCD enables high performance and low noise. We discuss the photometric characteristics of the CCD system and analyze the dependence of substrate voltage on lateral charge spreading through spatial autocorrelation analysis of flat-field images. Comparative studies reveal significantly lower fringe amplitude with the CCD261-84 compared to previous-generation detectors.
Article
Astronomy & Astrophysics
Tiina Liimets, Michaela Kraus, Alexei Moiseev, Nicolas Duronea, Lydia Sonia Cidale, Cecilia Farina
Summary: B[e] stars are massive B type emission line stars that contribute significantly to the chemical and dynamical evolution of their host galaxies. However, their large-scale environments have not been well-studied. In this study, we track the extended shells around B[e] stars and discover pronounced nebula structures around 15 more objects, providing more comprehensive information about the large-scale ejecta surrounding these stars.
Article
Astronomy & Astrophysics
V. L. Afanasiev, A. Moiseev, A. A. Smirnova
ASTROPHYSICAL BULLETIN
(2020)
Article
Astronomy & Astrophysics
Olga K. Sil'chenko, Alexei V. Moiseev, Oleg V. Egorov
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2019)
Article
Astronomy & Astrophysics
E. M. Schlegel, Thomas G. Pannuti, T. Lozinskaya, A. Moiseev, C. K. Lacey
ASTRONOMICAL JOURNAL
(2019)