同时观测h2o和sio脉泽对已知的河外水脉泽源

IF 1.1 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

Journal of the Korean Astronomical Society Pub Date : 2015-12-31 DOI:10.5303/JKAS.2015.48.6.357

Se-Hyung Cho, Dong-Hwan Yoon, Jaeheon Kim, D. Byun, J. Wagner

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引用次数: 0

摘要

2011年2月19日至22日，我们利用韩国VLBI网络的21米塔姆纳望远镜和新型宽带数字光谱仪观测了10个已知的22GHz H₂O脉泽星系。同时，我们搜索了43GHz SiO v = 1,2, J = 1 - 0脉泽发射。我们探测到5个源(m33、NGC 1052、NGC 1068、NGC 4258、m82)的H₂O脉泽发射，其余源(UGC 3193、UGC 3789、Antennae H₂O- west、M 51、NGC 6323)可能由于灵敏度原因未探测到H₂O发射。我们的22GHz光谱与早期的发现一致。我们同时进行的43GHz SiO脉泽搜索没有发现，首次在1.75 km s−1速度分辨率下，在3 σ灵敏度水平为0.018K-0.033K (0.24 Jy - 0.44 Jy)的条件下，得到了这些源中43GHz SiO脉泽发射的上限。我们的研究结果表明，这些源中的任何43GHz SiO脉泽(其中一些具有星爆相关的h2o千脉泽)与22GHz h2o脉泽发射相比一定是微弱的。

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SIMULTANEOUS OBSERVATIONS OF H 2 O AND SIO MASERS TOWARD KNOWN EXTRAGALACTIC WATER MASER SOURCES

We observe ten known 22GHz H₂O maser galaxies during February 19–22, 2011 using the 21 m Tamna telescope of the Korean VLBI Network and a new wide-band digital spectrometer. Simultaneously we searched for 43GHz SiO v = 1, 2, J = 1–0 maser emission. We detect H₂O maser emission towards five sources (M 33, NGC 1052, NGC 1068, NGC 4258, M 82), with non-detections towards the remaining sources (UGC 3193, UGC 3789, Antennae H₂O-West, M 51, NGC 6323) likely due to sensitivity. Our 22GHz spectra are consistent with earlier findings. Our simultaneous 43GHz SiO maser search produced non-detections, yielding – for the first time – upper limits on the 43GHz SiO maser emission in these sources at a 3 σ sensitivity level of 0.018K–0.033K (0.24 Jy–0.44 Jy) in a 1.75 km s −1 velocity resolution. Our findings suggest that any 43GHz SiO masers in these sources (some having starburst-associated H₂O kilomasers) must be faint compared to the 22GHz H₂O maser emission.

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来源期刊

Journal of the Korean Astronomical Society 地学天文-天文与天体物理

CiteScore

1.30

自引率

10.00%

发文量

审稿时长

>12 weeks

期刊介绍： JKAS is an international scientific journal publishing papers in all fields of astronomy and astrophysics. All manuscripts are subject to the scrutiny of referees. Manuscripts submitted to JKAS must comply with the ethics policy of JKAS. Six regular issues are published each year on February 28, April 30, June 30, August 31, October 31, and December 31. One year''s issues compose one volume.