NEWS ON THE PHYSICAL AND EVOLUTIONARY STATUS OF THE GIANT MOLECULAR CLOUD G-1.5-0.025 FROM THE OBSERVATIONS OF 4(-1)-3(0)E METHANOL LINE

Результат исследований: Вклад в журналСтатьяНаучно-исследовательскаярецензирование

Аннотация

The G 1,6-0,025 giant molecular cloud consists of dumps with sizes varying from 3'' (0,1 pc) to 5' (10 pc). Column densities of hydrogen and methanol in the large clumps are about (1-4) . 10(23) and (1-2) . 10(15) cm-2 respectively. Hydrogen densities in the large clumps vary from 10(2) to 5 . 10(4) cm-3 and in the small clumps reach values > 10(6) cm-3. A high kinetic temperature in the cloud, T(k) > 50-100 K, is partially a consequence of collisions with individual clumps. Such a collision is probably occuring nowadays toward (17h46m12s, -27 33'15'') where a 165 km/s clump is observed. Shocks connected with this collision can lead to enhancement of methanol abundance in some small-scale clumps with masses greater-than-or-equal-to 70-300 M. which therefore manifest spike features in the 4-1-3(0)E line. This enhancement results from chemical reactions initiated by the methanol evaporation from the grain mantles. A probable protostar cluster is present in the same direction. This fact can be a consequence of the collision too. Sensitivity of a set of methanol lines to the values of physical parameters is considered on the basis of statistical equilibrium calculations. It is shown that further methanol observations will bring us to a better understanding of the status of giant molecular clouds.

Язык оригиналаРусский
Страницы (с-по)1148-1165
Число страниц18
ЖурналАстрономический журнал
Том69
Номер выпуска6
СостояниеОпубликовано - 1992

Ключевые слова

  • MILLIMETER-WAVE
  • AMMONIA
  • NH3
  • REGIONS
  • MASERS

Предметные области WoS

  • Астрономия и астрофизика

Цитировать

@article{d080298605424b4aa38862a928416905,
title = "NEWS ON THE PHYSICAL AND EVOLUTIONARY STATUS OF THE GIANT MOLECULAR CLOUD G-1.5-0.025 FROM THE OBSERVATIONS OF 4(-1)-3(0)E METHANOL LINE",
abstract = "The G 1,6-0,025 giant molecular cloud consists of dumps with sizes varying from 3'' (0,1 pc) to 5' (10 pc). Column densities of hydrogen and methanol in the large clumps are about (1-4) . 10(23) and (1-2) . 10(15) cm-2 respectively. Hydrogen densities in the large clumps vary from 10(2) to 5 . 10(4) cm-3 and in the small clumps reach values > 10(6) cm-3. A high kinetic temperature in the cloud, T(k) > 50-100 K, is partially a consequence of collisions with individual clumps. Such a collision is probably occuring nowadays toward (17h46m12s, -27 33'15'') where a 165 km/s clump is observed. Shocks connected with this collision can lead to enhancement of methanol abundance in some small-scale clumps with masses greater-than-or-equal-to 70-300 M. which therefore manifest spike features in the 4-1-3(0)E line. This enhancement results from chemical reactions initiated by the methanol evaporation from the grain mantles. A probable protostar cluster is present in the same direction. This fact can be a consequence of the collision too. Sensitivity of a set of methanol lines to the values of physical parameters is considered on the basis of statistical equilibrium calculations. It is shown that further methanol observations will bring us to a better understanding of the status of giant molecular clouds.",
keywords = "MILLIMETER-WAVE, AMMONIA, NH3, REGIONS, MASERS",
author = "Sobolev, {A. M.}",
year = "1992",
language = "Русский",
volume = "69",
pages = "1148--1165",
journal = "Астрономический журнал",
issn = "0004-6299",
publisher = "MEZHDUNARODNAYA KNIGA",
number = "6",

}

NEWS ON THE PHYSICAL AND EVOLUTIONARY STATUS OF THE GIANT MOLECULAR CLOUD G-1.5-0.025 FROM THE OBSERVATIONS OF 4(-1)-3(0)E METHANOL LINE. / Sobolev, A. M.

В: Астрономический журнал, Том 69, № 6, 1992, стр. 1148-1165.

Результат исследований: Вклад в журналСтатьяНаучно-исследовательскаярецензирование

TY - JOUR

T1 - NEWS ON THE PHYSICAL AND EVOLUTIONARY STATUS OF THE GIANT MOLECULAR CLOUD G-1.5-0.025 FROM THE OBSERVATIONS OF 4(-1)-3(0)E METHANOL LINE

AU - Sobolev, A. M.

PY - 1992

Y1 - 1992

N2 - The G 1,6-0,025 giant molecular cloud consists of dumps with sizes varying from 3'' (0,1 pc) to 5' (10 pc). Column densities of hydrogen and methanol in the large clumps are about (1-4) . 10(23) and (1-2) . 10(15) cm-2 respectively. Hydrogen densities in the large clumps vary from 10(2) to 5 . 10(4) cm-3 and in the small clumps reach values > 10(6) cm-3. A high kinetic temperature in the cloud, T(k) > 50-100 K, is partially a consequence of collisions with individual clumps. Such a collision is probably occuring nowadays toward (17h46m12s, -27 33'15'') where a 165 km/s clump is observed. Shocks connected with this collision can lead to enhancement of methanol abundance in some small-scale clumps with masses greater-than-or-equal-to 70-300 M. which therefore manifest spike features in the 4-1-3(0)E line. This enhancement results from chemical reactions initiated by the methanol evaporation from the grain mantles. A probable protostar cluster is present in the same direction. This fact can be a consequence of the collision too. Sensitivity of a set of methanol lines to the values of physical parameters is considered on the basis of statistical equilibrium calculations. It is shown that further methanol observations will bring us to a better understanding of the status of giant molecular clouds.

AB - The G 1,6-0,025 giant molecular cloud consists of dumps with sizes varying from 3'' (0,1 pc) to 5' (10 pc). Column densities of hydrogen and methanol in the large clumps are about (1-4) . 10(23) and (1-2) . 10(15) cm-2 respectively. Hydrogen densities in the large clumps vary from 10(2) to 5 . 10(4) cm-3 and in the small clumps reach values > 10(6) cm-3. A high kinetic temperature in the cloud, T(k) > 50-100 K, is partially a consequence of collisions with individual clumps. Such a collision is probably occuring nowadays toward (17h46m12s, -27 33'15'') where a 165 km/s clump is observed. Shocks connected with this collision can lead to enhancement of methanol abundance in some small-scale clumps with masses greater-than-or-equal-to 70-300 M. which therefore manifest spike features in the 4-1-3(0)E line. This enhancement results from chemical reactions initiated by the methanol evaporation from the grain mantles. A probable protostar cluster is present in the same direction. This fact can be a consequence of the collision too. Sensitivity of a set of methanol lines to the values of physical parameters is considered on the basis of statistical equilibrium calculations. It is shown that further methanol observations will bring us to a better understanding of the status of giant molecular clouds.

KW - MILLIMETER-WAVE

KW - AMMONIA

KW - NH3

KW - REGIONS

KW - MASERS

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M3 - Статья

VL - 69

SP - 1148

EP - 1165

JO - Астрономический журнал

JF - Астрономический журнал

SN - 0004-6299

IS - 6

ER -