منابع مشابه
The clumpy structure of the chemically active L 1157 outflow
We present high spatial resolution maps, obtained with the Plateau de Bure Interferometer, of the blue lobe of the L1157 outflow. We observed four lines at 3 mm, namely CH3OH (2K–1K), HC3N (11–10), HCN (1–0) and OCS (7–6). Moreover, the bright B1 clump has also been observed at better spatial resolution in CS (2–1), CH3OH (21– 11)A −, and SO (32–21). These high spatial resolution observations s...
متن کاملSiO shocks in the L 1157 molecular outflow ?
We report high angular resolution IRAM Plateau de Bure interferometric observations of the SiO v = 0 J = 2→1 and J = 5 → 4 transitions in the southern lobe of the young L 1157 molecular outflow. The resolution of these observations (∼ 2.5′′) makes them directly comparable to available highresolution CO maps of the flow. The known precession of the L 1157 flow is fully confirmed. We find a remar...
متن کاملL 1157 : Interaction of the molecular outflow with the Class 0 environment
We present high angular resolution interferometric observations [ ⋆ ] of the dust continuum at 2.7 and 1.3 mm, and of the HC3N (J=12→11) and C 18 O (J=2→1) emission around L1157-mm, a Class 0 object that drives a spectacular molecular outflow. The millimeter dust emission is clearly resolved into two components, a flattened compact source of ∼450×250 AU at 1.3 mm, and mass ∼0.1 M⊙, plus an exte...
متن کاملFlattened Protostellar Envelope in Absorption around L 1157
Deep Spitzer IRAC images of L1157 reveal many of the details of the outflow and the circumstellar environment of this Class 0 protostar. In IRAC band 4, 8 μm, there is a flattened structure seen in absorption against the background emission. The structure is perpendicular to the outflow and is extended to a diameter of ∼2′. This structure is the first clear detection of a flattened circumstella...
متن کاملDust emission from young outflows : the case of L 1157
We present new high-sensitivity 1.3 mm bolometer observations of the young outflow L 1157. These data show that the continuum emission arises from four distinct components: a circumstellar disk, a protostellar envelope, an extended flattened envelope –the dense remnant of the molecular cloud in which the protostar was formed–, and the outflow itself, which represents ∼20% of the total flux. The...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2001
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20010519