Star formation complexes in the ‘galaxy-sized’ supergiant shell of the galaxy HolmbergI

Egorov, Oleg V.; Lozinskaya, T. A.; Моисеев, А. В.; Smirnov-Pinchukov, Grigorii V.

doi:10.1093/mnras/sty1158

Cited by 30 publications

(24 citation statements)

References 88 publications

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“…The initial data reduction was performed in a standard way using the idl software package written for reducing long-slit spectroscopic data obtained with SCORPIO-2 as it was described in our previous papers (e.g., Egorov et al 2018). After the bias subtraction and cosmic rays hits removal, all individual exposures of each spectrum were stacked; further steps of data reduction include correction of the geometric distortion, normalization to the flat-field spectrum, wavelength calibration, subtraction of the nightsky spectrum, and flux calibration using one of the spectrophotometric standards observed in the same night in a close airmass with the galaxy.…”

Section: Observations and Data Analysismentioning

confidence: 99%

Metallicity and ionization state of the gas in polar-ring galaxies

Egorov

Моисеев

2019

Monthly Notices of the Royal Astronomical Society

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The ionization state and oxygen abundance distribution in a sample of polar-ring galaxies (PRGs) were studied from the long-slit spectroscopic observations carried out with the SCORPIO-2 focal reducer at the Russian 6-m telescope. The sample consists of 15 PRGs classified as 'the best candidates' in the SDSS-based Polar Ring Catalogue. The distributions of line-of-sight velocities of stellar and gaseous components have given kinematic confirmation of polar structures in 13 galaxies in the sample. We show that ionization by young stars dominates in the external parts of polar discs, while shocks have a significant contribution to gas excitation in the inner parts of polar structures. This picture was predicted earlier in a toy model implying the collision between gaseous clouds on polar orbits with the stellar disc gravitational potential well. The exception is a moderately inclined ring to the host galaxy NGC 5014: the accreted gas in the centre has already settled on the main plane and ionized by young stars, while the gas in the internal part of the ring is excited by shocks. The present study three times increases the number of polar structures with an available oxygen abundance estimation. The measured values of the gas metallicity almost do not depend on the galaxy luminosity. The radial [O/H] gradient in the considered polar rings is shallow or absent. No metal-poor gas was detected. We ruled out the scenario of the formation of polar rings due to cold accretion from cosmic filaments for the considered sample of PRGs.

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Section: Observations and Data Analysismentioning

confidence: 99%

Metallicity and ionization state of the gas in polar-ring galaxies

Egorov

Моисеев

2019

Monthly Notices of the Royal Astronomical Society

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“…Observations with FPI allow this process to be studied in detail. For a detailed review, see Egorov et al (2015) and recent papers on Holmberg I and II (Egorov et al, 2017b(Egorov et al, , 2018) galaxies.…”

Section: Gas In Star-forming Regionsmentioning

confidence: 99%

Scanning Fabry--Perot Interferometer of the 6-m SAO RAS Telescope

Moiseev

2021

Preprint

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The scanning Fabry-Perot interferometer (FPI) -is the oldest method of optical 3D spectroscopy. It is still in use because of the high spectral resolution it provides over a large field of view. The history of the application of this method for the study of extended ob jects (nebulae and galaxies) and the technique of data reduction and analysis are discussed. The paper focuses on the performing observations with the scanning FPI on the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS). The instrument is currently used as a part of the SCORPIO-2 multimode focal reducer. The results of studies of various galactic and extragalactic objects with the scanning FPI on the 6-m telescope-star-forming regions and young stellar objects, spiral, ring, dwarf and interacting galaxies, ionization cones of active galactic nuclei, galactic winds, etc. are briefly discussed. Further prospects for research with the scanning FPI of the SAO RAS are discussed.

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“…The data reduction was performed in a standard way using the SCORPIO-2 idl-based pipeline as described in Egorov et al (2018). The observations of the spectrophotometric standards BD+28d4211 at a close zenith distance immediately after or before the DDO 53 observations were used to calibrate its spectra to an absolute intensity scale.…”

Section: Long-slit Spectroscopic Observationsmentioning

confidence: 99%

“…long-slit or integral field unit (IFU) spectrographs, we previously analysed in details the kinematics, morphology and chemical abundance of the ISM and their relation with the ongoing star formation activity in several individual galaxies of the M81 group: VII Zw 403 (Lozinskaya et al 2006;Arkhipova et al 2007;Egorov & Lozinskaya 2011), IC 2574 (Egorov et al 2014), Holmberg I (Egorov et al 2018), Holmberg II (Egorov et al 2013;Wiebe et al 2014;Egorov et al 2017), NGC 3077 (Oparin et al 2020). All these galaxies are gas rich and reveal extended complexes of star formation with prominent feedback-driven superbubbles, and in most of them the long duration of star formation activity led to the creation of so called supergiant shells (SGS), having sizes up to 2 kpc, the interaction of which could be a driver of star formation propagation (Egorov et al 2017;Vasiliev et al 2020).…”

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confidence: 99%

Star formation in the nearby dwarf galaxy DDO 53: interplay between gas accretion and stellar feedback

Egorov,

Lozinskaya,

Vasiliev

et al. 2021

Preprint

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We present the results of a multiwavelength study of the nearby dwarf galaxy DDO 53 -a relatively isolated member of the M 81 group. We analyse the atomic and ionised gas kinematics (based on the observations with Fabry-Perot interferometer in Hα line and archival data in H i 21 cm line), distribution, excitation and oxygen abundance of the ionised gas (based on the long-slit and integral-field spectroscopy and on imaging with narrow-band filters), and their relation with the young massive stars (based on archival HST data). We detect a faint 2-kpc sized supershell of ionised gas surrounding the galaxy. Most probably, this structure represents a large-scale gas outflow, however it could be also created by the ionising quanta leaking from star-forming regions to the marginally detected atomic hydrogen surrounding the galactic disc. We analyse the properties of the anomalous H i in the north part of the galaxy and find that its peculiar kinematics is also traced by ionised gas. We argue that this H i feature is related to the accreting gas cloud captured from the intergalactic medium or remaining after the merger event occurred > 1 Gyr ago. The infalling gas produces shocks in the interstellar medium and could support the star formation activity in the brightest region in DDO 53.

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Star formation complexes in the ‘galaxy-sized’ supergiant shell of the galaxy HolmbergI

Cited by 30 publications

References 88 publications

Metallicity and ionization state of the gas in polar-ring galaxies

Metallicity and ionization state of the gas in polar-ring galaxies

Scanning Fabry--Perot Interferometer of the 6-m SAO RAS Telescope

Star formation in the nearby dwarf galaxy DDO 53: interplay between gas accretion and stellar feedback

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