A High Cluster Formation Efficiency in the Sagittarius B2 Complex
نویسندگان
چکیده
منابع مشابه
HCl absorption toward Sagittarius B2.
We have detected the 626 GHz J = 1 --> 0 transition of hydrogen chloride (H35Cl) in absorption against the dust continuum emission of the molecular cloud Sagittarius B2. The observed line shape is consistent with the blending of the three hyperfine components of this transition by the velocity profile of Sgr B2 observed in other species. The apparent optical depth of the line is tau approxima...
متن کاملDeuterium in the Sagittarius B2 and Sagittarius A galactic center regions
We report IRAM 30-m observations of DCN and DCO+ towards the galactic center molecular clouds Sgr B2 and Sgr A. We compare our results with simultaneous measurements of H13CN and HCO+ in order to derive estimates of the [DCN]/[HCN] and [DCO+]/[HCO] abundance ratios. We mapped Sgr B2 in DCN(2-1) and DCN(3-2) and we compared HCN with DCN for one position of our maps. The uncertainties in such mea...
متن کاملWarm Water Vapor around Sagittarius B2
In the region of Sgr B2 there are several condensations heated externally by nearby hot stars. Therefore H2O far–IR lines are expected to probe only an external low–density and high temperature section of these condensations, whereas millimeter-wave lines can penetrate deeper into them where the density is higher and Tk lower. We have conducted a study combining H2O lines in both spectral regio...
متن کاملFar–IR spectroscopy towards Sagittarius B2
The far–IR is a unique wavelength range for Astrophysical studies, however, it can only be fully sampled from space platforms. The fundamental rotational transitions of light molecules, the high–J transitions of polyatomic species, the bending modes of non-polar molecules, several atomic fine structure lines and many frequencies blocked by the earth atmosphere can only be observed between 50 an...
متن کاملfocus on communication in iranian high school language classes: a study of the role of teaching materials in changing the focus onto communication in language classes
چکیده ارتباط در کلاس به عوامل زیادی از جمله معلمان، دانش آموزان، برنامه های درسی و از همه مهم تر، مواد آموزشی وابسته است. در تدریس ارتباطی زبان که تاکید زیادی بر توانش ارتباطی دارد، کتاب درسی به عنوان عامل موثر بر پویایی کلاس محسوب میگردد که درس ها را از طریق فراهم آوردن متن ارتباط کلاسی و هم چنین نوع تمرین زبانی که دانش آموزان در طول فعالیت های کلاسی به آن مشغول اند، کنترل می کند. این حقیقت ک...
15 صفحه اولذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2018
ISSN: 2041-8213
DOI: 10.3847/2041-8213/aada89