STUDY OF A COMPACT SOURCE WITH AN ENHANCED NH$_2$D/NH$_3$ ABUNDANCE RATIO IN THE S187 REGION
Авторы:
1.
Federal Research Center A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Science
2.
Federal Research Center A.V. Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences
Россия
Россия
3.
Gaponov-Grekhov Institute of Applied Physics of the Russian Academy of Sciences
4.
Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory
5.
Max-Planck-Institut für Radioastronomie
Astronomy Department, King Abdulaziz University
Astronomy Department, King Abdulaziz University
Тип:
Статья конференции
Опубликовано:
27.12.2024
Классификаторы:
УДК 52 Астрономия. Геодезия
УДК 53 Физика
УДК 520 Инструменты, приборы и методы астрономических наблюдений, измерений и анализа
УДК 521 Теоретическая астрономия. Небесная механика. Фундаментальная астрономия. Теория динамической и позиционной астрономии
УДК 523 Солнечная система
УДК 524 Звезды и звездные системы. Вселенная Солнце и Солнечная система
УДК 52-1 Метод изучения
УДК 52-6 Излучение и связанные с ним процессы
ГРНТИ 41.00 АСТРОНОМИЯ
ГРНТИ 29.35 Радиофизика. Физические основы электроники
ГРНТИ 29.31 Оптика
ГРНТИ 29.33 Лазерная физика
ГРНТИ 29.27 Физика плазмы
ГРНТИ 29.05 Физика элементарных частиц. Теория полей. Физика высоких энергий
ОКСО 03.06.01 Физика и астрономия
ОКСО 03.05.01 Астрономия
ОКСО 03.04.03 Радиофизика
ББК 2 ЕСТЕСТВЕННЫЕ НАУКИ
ББК 223 Физика
ТБК 614 Астрономия
ТБК 6135 Оптика
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics
УДК 53 Физика
УДК 520 Инструменты, приборы и методы астрономических наблюдений, измерений и анализа
УДК 521 Теоретическая астрономия. Небесная механика. Фундаментальная астрономия. Теория динамической и позиционной астрономии
УДК 523 Солнечная система
УДК 524 Звезды и звездные системы. Вселенная Солнце и Солнечная система
УДК 52-1 Метод изучения
УДК 52-6 Излучение и связанные с ним процессы
ГРНТИ 41.00 АСТРОНОМИЯ
ГРНТИ 29.35 Радиофизика. Физические основы электроники
ГРНТИ 29.31 Оптика
ГРНТИ 29.33 Лазерная физика
ГРНТИ 29.27 Физика плазмы
ГРНТИ 29.05 Физика элементарных частиц. Теория полей. Физика высоких энергий
ОКСО 03.06.01 Физика и астрономия
ОКСО 03.05.01 Астрономия
ОКСО 03.04.03 Радиофизика
ББК 2 ЕСТЕСТВЕННЫЕ НАУКИ
ББК 223 Физика
ТБК 614 Астрономия
ТБК 6135 Оптика
BISAC SCI004000 Astronomy
BISAC SCI005000 Physics / Astrophysics
Язык материала:
английский
Ключевые слова:
ISM: clouds, molecules; individual: S187
Аннотация (русский):
When analyzing data obtained with the Onsala 20-m radio telescope (Sweden) in 2018, a compact peak of NH$_2$D emission with an enhanced ratio of NH$_2$D/NH$_3$ column densities was discovered in the S187 region. This peak is not associated with any known astronomical object from the SIMBAD database, but previously obtained dust emission maps have a peak in this region. Additional observations of this region were carried out in 2023 with the Onsala telescope. The kinetic temperature in the center of the source was determined using the rotational diagrams of the CH$_3$CN and CH$_3$CCH molecules, and it turned out to be quite high (according to various estimates, approximately from 30 K to 50 K). Based on the spectra of the C$^{18}$O molecule and dust emission, estimates of the column density of molecular hydrogen were obtained. Deuterated NH$_2$D and DCO$^+$ molecules were detected in this region, while no noticeable emission of the DCN molecule was detected. Estimates of the column densities at the center of the source were obtained by processing the spectra of NH$_2$D, DCO$^+$, HC$^{18}$O$^+$ and HC$_3$N molecules. Maps of the integral intensities of these molecules were also constructed. The ratio of the abundances of ortho- and para-NH$_2$D, as well as the ratio of NH$_2$D and the main isotopologue of NH$_3$ were found. The possible nature of the source is discussed.
When analyzing data obtained with the Onsala 20-m radio telescope (Sweden) in 2018, a compact peak of NH$_2$D emission with an enhanced ratio of NH$_2$D/NH$_3$ column densities was discovered in the S187 region. This peak is not associated with any known astronomical object from the SIMBAD database, but previously obtained dust emission maps have a peak in this region. Additional observations of this region were carried out in 2023 with the Onsala telescope. The kinetic temperature in the center of the source was determined using the rotational diagrams of the CH$_3$CN and CH$_3$CCH molecules, and it turned out to be quite high (according to various estimates, approximately from 30 K to 50 K). Based on the spectra of the C$^{18}$O molecule and dust emission, estimates of the column density of molecular hydrogen were obtained. Deuterated NH$_2$D and DCO$^+$ molecules were detected in this region, while no noticeable emission of the DCN molecule was detected. Estimates of the column densities at the center of the source were obtained by processing the spectra of NH$_2$D, DCO$^+$, HC$^{18}$O$^+$ and HC$_3$N molecules. Maps of the integral intensities of these molecules were also constructed. The ratio of the abundances of ortho- and para-NH$_2$D, as well as the ratio of NH$_2$D and the main isotopologue of NH$_3$ were found. The possible nature of the source is discussed.
Ключевые слова:
ISM: clouds, molecules; individual: S187
ISM: clouds, molecules; individual: S187
1. Pazukhin A.G., Zinchenko I.I., Trofimova E.A., et al., 2023, Monthly Notices of the Royal Astronomical Society, 526, 3, p. 3673
2. Sipilä O., Harju J., Caselli P., et al., 2015, Astronomy & Astrophysics, 581, id. A122
3. Trofimova E.A., Zinchenko I.I., Zemlyanukha P.M., et al., 2020, Astronomy Reports, 64, 3, p. 244
4. Zinchenko I., Caselli P., Pirogov L., 2009, Monthly Notices of the Royal Astronomical Society, 395, 431, p. 2234
