Journal ArticleDOI
Interstellar bubbles. II - Structure and evolution
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In this article, the detailed structure of the interaction of a strong stellar wind with the interstellar medium is presented, including the effects of thermal conduction between the hot interior and the cold shell of swept-up interstellar matter.Abstract:
The detailed structure of the interaction of a strong stellar wind with the interstellar medium is presented. First, an adiabatic similarity solution is given which is applicable at early times. Second, a similarity solution is derived which includes the effects of thermal conduction between the hot (about 1 million K) interior and the cold shell of swept-up interstellar matter. This solution is then modified to include the effects of radiative energy losses. The evolution of an interstellar bubble is calculated, including the radiative losses. The quantitative results for the outer-shell radius and velocity and the column density of highly ionized species such as O VI are within a factor 2 of the approximate results of Castor, McCray, and Weaver (1975). The effect of stellar motion on the structure of a bubble, the hydrodynamic stability of the outer shell, and the observable properties of the hot region and the outer shell are discussed.read more
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Journal ArticleDOI
Star formation complexes in the `galaxy-sized' supergiant shell of the galaxy HolmbergI
Oleg V. Egorov,Oleg V. Egorov,T. A. Lozinskaya,Alexei Moiseev,Alexei Moiseev,Grigorii V. Smirnov-Pinchukov,Grigorii V. Smirnov-Pinchukov +6 more
TL;DR: In this article, a detailed analysis of gas kinematics, ionization conditions, and metallicity of star-forming regions in the galaxy Holmberg I has been presented.
Journal ArticleDOI
Multiwavelength analysis of the Lyman-α emitting galaxy Haro 2: relation between the diffuse Lyman-α and soft X-ray emissions
H. Oti-Floranes,H. Oti-Floranes,J. M. Mas-Hesse,Elena Jiménez-Bailón,Daniel Schaerer,Daniel Schaerer,Matthew Hayes,Matthew Hayes,Göran Östlin,Hakim Atek,D. Kunth +10 more
TL;DR: In this article, the authors used HST-STIS spectral images along the major and minor axes of Haro 2 to characterize the Lyα emission, as well as FOC UV, WFPC-2 optical and NICMOS near infrared broadband-filter images to analyze the properties of the stellar population.
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An Old Supernova Remnant within an HII Complex at l {\approx} 173{\circ}: FVW 172.8+1.5
TL;DR: In this article, the authors present the results of HI 21-cm line observations to explore the nature of the high-velocity (HV) HI gas at l ~ 173 kpc, and demonstrate that the HV HI gas is well correlated with the radio continuum loop and that the two seem to trace an expanding shell.
Journal ArticleDOI
The supergiant shell with triggered star formation in the dwarf irregular galaxy IC 2574: neutral and ionized gas kinematics
Abstract: We analyse the ionized gas kinematics in the star formation regions of the supergiant shell (SGS) of the IC 2574 galaxy using observations with the Fabry-Perot interferometer at the 6-m telescope of SAO RAS; the data of the THINGS survey are used to analyze the neutral gas kinematics in the area. We perform the 'derotation' of the H-alpha and HI data cubes and show its efficiency in kinematics analysis. We confirm the SGS expansion velocity 25 km/s obtained by Walter & Brinks (1999) and conclude that the SGS is located at the far side of the galactic disc plane. We determine the expansion velocities, kinematic ages, and the required mechanical energy input rates for four star formation complexes in the walls of the SGS; for the remaining ones we give the limiting values of the above parameters. A comparison with the age and energy input of the complexes' stellar population shows that sufficient energy is fed to all HII regions except one. We discuss in detail the possible nature of this region and that of another one, which was believed to be an SNR according to radio observations. We measured the expansion velocity of the latter and confirm its identification as an old SNR. Our observations allowed us to identify a faint diffuse H-alpha emission inside the SGS which was never observed before.
Journal ArticleDOI
Near-Infrared Observations of N11 in the Large Magellanic Cloud: Triggered Star Formation around the Periphery of LH 9
Hirofumi Hatano,Ryota Kadowaki,Yasushi Nakajima,Motohide Tamura,Tetsuya Nagata,Koji Sugitani,Toshihiko Tanabe,Daisuke Kato,Mikio Kurita,Shogo Nishiyama,Daisuke Baba,Akika Ishihara,Shuji Sato +12 more
TL;DR: In this paper, near-infrared observations have been carried out to survey young stellar objects in the second largest H II region in the Large Magellanic Cloud, N11.