منابع مشابه
An Accreting Starless Core
We have mapped the starless core TMC-1C in a variety of molecular lines with the IRAM 30m telescope. High density tracers show clear signs of self-absorption and sub-sonic infall asymmetries are present in N 2 H + (1–0) and DCO + (2–1) lines. The inward velocity profile in N 2 H + (1–0) is extended over a region of about 7,000 AU in radius around the dust continuum peak, which is the most exten...
متن کاملAlma Observations of Starless Core Substructure in Ophiuchus
Compact substructure is expected to arise in a starless core as mass becomes concentrated in the central region likely to form a protostar. Additionally, multiple peaks may form if fragmentation occurs. We present ALMA Cycle 2 observations of 60 starless and protostellar cores in the Ophiuchus molecular cloud. We detect eight compact substructures which are > 15 from the nearest Spitzer YSO. On...
متن کاملA Contracting, Turbulent, Starless Core in the Serpens Cluster
We present combined single-dish and interferometric CS(2–1) and N2H (1– 0) observations of a compact core in the NW region of the Serpens molecular cloud. The core is starless according to observations from optical to millimeter wavelengths and its lines have turbulent widths and “infall asymmetry”. Line profile modeling indicates supersonic inward motions vin ∼> 0.34 km s −1 over an extended r...
متن کاملE : the first starless core with no molecular depletion
L1521E seems unique among starless cores. It stands out in a distribution of a ratio (R) that we define to asses core evolution, and which compares the emission of the easily-depleted C 18 O molecule with that of the hard to deplete, late-time species N 2 H +. While all cores we have studied so far have R ratio lower than 1, L1521E has an R value of 3.4, which is 8 times the mean of the other c...
متن کاملL1521E: A Starless Core in the Early Evolutionary Stage ?
We have studied the physical and chemical properties of a quiescent starless core L1521E with various molecular lines. It is found that there exists a compact dense core traced by the HCO, HNC, CCS, and HC3N lines; their distributions have a single peak at the same position. The core radius is as small as 0.031 pc, whereas the H2 density at the peak position is as high as (1.3-5.6)×105 cm−3. Al...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2007
ISSN: 0004-637X,1538-4357
DOI: 10.1086/521577