|
ИСТИНА |
Войти в систему Регистрация |
ИПМех РАН |
||
Near Infrared View on the Photo-Dissociation Regions S 255, S 257, NGC 7538, and S 140статья
Информация о цитировании статьи получена из
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.
- Авторы: Kirsanova M.S., Tatarnikov A.M., Boley P.A., Wiebe D.S., Maslennikova N.A., Tatarnikov A.A.
- Журнал: Astrophysical Bulletin
- Том: 78
- Номер: 3
- Год издания: 2023
- Первая страница: 372
- Последняя страница: 383
- DOI: 10.1134/s199034132360014x
- Аннотация: We performed photometric observations of the S 255, S 257, S 140, NGC 7358, and the Orion Bar photo-dissociation regions (PDRs) at 2 micron using narrow-band filters centered on the Br_gamma, H2, and [Fe II] lines, as well as the narrow-band and the broad-band filters for continuum subtraction. The observations were done with the 2.5-m telescope of the SAI Caucasian Mountain Observatory and the near-infrared camera and spectrograph ASTRONIRCAM. We find several high-density arc-like structures in the Br and [Fe II] images of the ionized gas in NGC 7538 and extended shells and arcs visible through the H emission. The H ionization front and H dissociation front are merged in NGC 7538. In S 255 and S 257 we detected only Br_gamma emission from the H II regions and bright H emission from the PDRs. The projected distance between the H ionization and H dissociation fronts is approximately 0.3–0.4 pc, which cannot be explained using models of a uniform medium. Most probably, the ionized and neutral gas in these PDRs is clumpy. The H I-to-H transitions in the NGC 7538, S 255, S 257 and S 140 PDRs are gradual with no sharp borders. This conclusion also agrees with the suggestion of a clumpy medium.
- Добавил в систему: Татарников Андрей Михайлович