UNVEILING THE MAIN HEATING SOURCES IN THE CEPHEUS A HW2 REGION
UNVEILING THE MAIN HEATING SOURCES IN THE CEPHEUS A HW2 REGION
复制标题
揭晓 CEPHEUS A HW2 区域的主要热源
DOI:
10.1088/0004-637x/703/2/l157
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
Jiménez-Serra I
中科院分区:
文献类型:
--
作者:
Jiménez-Serra I
We present high angular resolution Plateau de Bure Interferometer images (beam of∼ 0 farcs 33) of the J= 27→ 26 line from several vibrational levels (v 7= 1 and v 6= 1) of HC 3 N toward Cepheus A HW2. These images reveal the two main heating sources in the cluster: one centered in the disk collimating the HW2 radio jet (the HW2 disk), and the other associated with a hot core 0 farcs 3 northeast HW2 (the HC). This is the first time that vibrationally excited emission of HC 3 N is spatially resolved in a disk. The kinematics of this emission shows that the HW2 disk rotates following a Keplerian law. We derive the temperature profiles in the two objects from the excitation of HC 3 N along the HW2 disk and the HC. These profiles reveal that both objects are centrally heated and show temperature gradients. The inner and hotter regions have temperatures of 350±30 K and 270±20 K for the HW2 disk and the HC, respectively. In the cooler and outer regions, the temperature drops to 250±30 K in the HW2 disk, and to 220±15 K in the HC. The estimated luminosity of the heating source of the HW2 disk is∼ 2.2× 10 4 L☉, and∼ 3000 L☉ for the HC. The most massive protostar in the HW2 region is the powering source of the HW2 radio jet. We discuss the formation of multiple systems in this cluster. The proximity of the HC to HW2 suggests that these sources likely form a binary system of B stars, explaining the observed precession of the HW2 radio jet.
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DOI:
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发表时间:
1996
期刊:
影响因子:
--
作者:
J. Torrelles;José F. Gómez;Luis F. Rodriguez;S. Curiel;P. Ho;G. Garay
通讯作者:
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10.1086/380296
发表时间:
2003
期刊:
The Astrophysical Journal Letters
影响因子:
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1994
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发表时间:
2005
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作者:
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通讯作者:
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DOI:
10.1086/323061
发表时间:
2001
期刊:
The Astrophysical Journal
影响因子:
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作者:
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通讯作者:
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