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A new intermediate-mass protostar in the cepheus a HW2 region

AuthorsMartín-Pintado, Jesús ; Jiménez-Serra, I.; Rodriguez-Franco, A.; Martín, S.; Thum, C.
Issue Date2005
PublisherUniversity of Chicago Press
CitationAstrophysical Journal 628: L61- L64 (2005)
AbstractWe present the discovery of the first molecular hot core associated with an intermediate-mass protostar in the Cep A HW2 region. The hot condensation was detected from single-dish and interferometric observations of several high-excitation rotational lines (from 100 to 880 K above the ground state) of SO2 in the ground vibrational state and of HC3N in the vibrationally excited states v7 = 1 and v7 = 2. The kinetic temperature derived from both molecules is ∼160 K. The high angular resolution observations (1″.25 × 0″.99) of the SO2 J = 287.21 → 296.24 line (488 K above the ground state) show that the hot gas is concentrated in a compact condensation with a size of ∼0″.6 (∼430 AU), located 0″.4 (300 AU) east from the radio jet HW2. The total SO2 column density in the hot condensation is ∼1018 cm-2, with an H2 column density ranging from ∼1023 to 6 × 1024 cm-2. The H2 density and the SO2 fractional abundance must be larger than 107 cm-3 and 2 × 10-7, respectively. The most likely alternatives for the nature of the hot and very dense condensation are discussed. From the large column densities of hot gas, the detection of the HC3N vibrationally excited lines, and the large SO2 abundance, we favor the interpretation of a hot core heated by an intermediate-mass protostar of 10 3 L⊙. This indicates that the Cep A HW2 region contains a cluster of very young stars. © 2005. The American Astronomical Society. All rights reserved.
Identifiersdoi: 10.1086/432684
issn: 0004-637X
Appears in Collections:(CFMAC-IEM) Artículos
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