Search Publications

Ethynyl Around the HII Regions S255 and S257

Kirsanova, M. S.; Punanova, A. F.; Buslaeva, A. I.

We present the results of the ethynyl (C₂H) emission line observations towards the S255 and S257 HII regions and the molecular cloud between them. Radial profiles of line brightness, column density, and abundance of C₂H are obtained. We show that the radial profile of the ethynyl abundance is almost flat towards the HII regio…

Principal Component Analysis for Estimating Parameters of the L1287 Dense Core by Fitting Model Spectral Maps into Observed Ones

Pirogov, L. E.; Zemlyanukha, P. M.

An algorithm has been developed for finding the global minimum of a multidimensional error function by fitting model spectral maps into observed ones. Principal component analysis is applied to reduce the dimensionality of the model and the coupling degree between the parameters, and to determine the region of the minimum. The k-nearest neighbors …

Relation between the parameters of dust and of molecular and atomic gas in extragalactic star-forming regions

Smirnova, K. I.; Wiebe, D. S.; Sobolev, A. M. +1 more

The relationships between atomic and molecular hydrogen and dust of various sizes in extragalactic star-forming regions are considered, based on observational data from the Spitzer and Herschel infrared space telescopes, the Very Large Array (atomic hydrogen emission) and IRAM (CO emission). The source sample consists of approximately 300 star-for…

Infrared Morphology of Regions of Ionized Hydrogen

Wiebe, D. S.; Kirsanova, M. S.; Topchieva, A. P. +1 more

A search for infrared ring nebulae associated with regions of ionized hydrogen has been carried out. The New GPS Very Large Array survey at 20 cm forms the basis of the search, together with observations obtained with the Spitzer Space Telescope at 8 and 24 µm and the Herschel Space Telescope at 70 µm. Objects having ring-like morpholo…

Infrared emission and the destruction of dust in HII regions

Wiebe, D. S.; Kirsanova, M. S.; Pavlyuchenkov, Ya. N.

The generation of infrared (IR) radiation and the observed IR-intensity distribution at wavelengths of 8, 24, and 100 µm in the ionized hydrogen region around a young, massive star is investigated. The evolution of the HII region is treated using a self-consistent chemical-dynamical model in which three dust populations are included—large silicate…