Gas and dust in the BCD galaxy VII Zw 403 (UGC 6456)

Egorov, Oleg V.; Lozinskaya, T. A.

doi:10.1134/s1990341311030023

Cited by 6 publications

(1 citation statement)

References 28 publications

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

Egorov

Lozinskaya

Vasiliev

et al. 2021

Monthly Notices of the Royal Astronomical Society

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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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Emission spectrum of ionized gas in the irregular galaxy Holmberg II

Egorov¹,

Lozinskaya²,

Моисеев³

2012

Monthly Notices of the Royal Astronomical Society

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We study the ionized gas spectrum of star forming regions in the Holmberg II galaxy using the optical long-slit spectroscopic observations made at the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS). We estimate the oxygen, nitrogen, sulphur, neon, and argon abundances in individual H ii regions and find the average metallicity in the galaxy to be Z ≃ 0.1 or 0.3 Z ⊙ depending on the estimation method employed. We use these observations combined with the results of our earlier studies of the Irr galaxy IC 10 and BCD galaxy VII Zw 403 to compare the currently most popular methods of gas metallicity estimation in order to select among them the techniques that are most reliable for analysing Irr galaxies. To this end, we use the 'direct' T e method and six empirical and theoretical methods. The results of our observations mostly confirm the conclusions of López-Sánchez et al. (2012) based on the analysis of systematic deviations of metallicity estimates derived by applying different methods to 'model' H ii regions.

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Gas and dust in the BCD galaxy VII Zw 403 (UGC 6456)

Cited by 6 publications

References 28 publications

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

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

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

Emission spectrum of ionized gas in the irregular galaxy Holmberg II

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