Clouds of high infrared extinction are promising sites of massive star/cluster formation. A large... more Clouds of high infrared extinction are promising sites of massive star/cluster formation. A large number of cloud cores discovered in recent years allow for the investigation of a possible evolutionary sequence among cores in early phases. We have conducted a survey of deuterium fractionation toward 15 dense cores in various evolutionary stages, from high-mass starless cores to ultracompact H II
We have mapped the ultracompact HII region, G5.89-0.39, and its molecular surroundings with the S... more We have mapped the ultracompact HII region, G5.89-0.39, and its molecular surroundings with the Submillimeter Array at 2".8 x 1".8 angular resolution in 1.3 mm continuum, SiO(5-4), and eight other molecular lines. We have resolved for the first time the highly energetic molecular outflow in this region. At this resolution, the outflow is definitely bipolar and appears to originate in
We have made the first detection of interstellar acetic acid (CH3COOH) toward the high mass star ... more We have made the first detection of interstellar acetic acid (CH3COOH) toward the high mass star forming region W51. This is the first new source of interstellar acetic acid since its discovery by Mehringer et al. (1997) toward the high mass star forming region Sgr B2(N-LMH). In this poster, we report CH3COOH observations at two new frequencies toward Sgr B2(N-LMH)
ABSTRACT We present BIMA Array observations of formic acid (HCOOH) in Galactic hot molecular core... more ABSTRACT We present BIMA Array observations of formic acid (HCOOH) in Galactic hot molecular cores. It has been found that among nearly 120 interstellar and circumstellar molecular species identied to date, the more complex and saturated organic species are usually observed ...
Proceedings of the International Astronomical Union, 2005
Abstract. Rich molecular complexity has been shown to exist in star forming regions primarily thr... more Abstract. Rich molecular complexity has been shown to exist in star forming regions primarily through millimeter to submillimeter single-dish spectral line surveys or searches over the years. With a few case studies, we demonstrate that interferometric observations are a ...
We report a weak detection of HCN J=1--0 emission from comet C/1999 S4 (LINEAR) with the Berkeley... more We report a weak detection of HCN J=1--0 emission from comet C/1999 S4 (LINEAR) with the Berkeley-Illinois-Maryland Association (BIMA) Array in auto-correlation mode, in the three days prior to this comet's breakup on 2000 July 25 (M. Kidger, IAUC 7467). The antenna temperature of 3.5 +/- 1.0 mK in the 130'' beam suggests an outgassing rate at a few percent
ABSTRACT We present BIMA (Berkeley-Illinois-Maryland Association) array observations of the SiO v... more ABSTRACT We present BIMA (Berkeley-Illinois-Maryland Association) array observations of the SiO v \ 0, J \ 2»1 transition toward the Sgr B2 star formation region. The observations have angular and spectral resolutions of (a ] d) and 1.35 km s~1, respectively. Emission from ...
Clouds of high infrared extinction are promising sites of massive star/cluster formation. A large... more Clouds of high infrared extinction are promising sites of massive star/cluster formation. A large number of cloud cores discovered in recent years allow for the investigation of a possible evolutionary sequence among cores in early phases. We have conducted a survey of deuterium fractionation toward 15 dense cores in various evolutionary stages, from high-mass starless cores to ultracompact H II
We have mapped the ultracompact HII region, G5.89-0.39, and its molecular surroundings with the S... more We have mapped the ultracompact HII region, G5.89-0.39, and its molecular surroundings with the Submillimeter Array at 2".8 x 1".8 angular resolution in 1.3 mm continuum, SiO(5-4), and eight other molecular lines. We have resolved for the first time the highly energetic molecular outflow in this region. At this resolution, the outflow is definitely bipolar and appears to originate in
We have made the first detection of interstellar acetic acid (CH3COOH) toward the high mass star ... more We have made the first detection of interstellar acetic acid (CH3COOH) toward the high mass star forming region W51. This is the first new source of interstellar acetic acid since its discovery by Mehringer et al. (1997) toward the high mass star forming region Sgr B2(N-LMH). In this poster, we report CH3COOH observations at two new frequencies toward Sgr B2(N-LMH)
ABSTRACT We present BIMA Array observations of formic acid (HCOOH) in Galactic hot molecular core... more ABSTRACT We present BIMA Array observations of formic acid (HCOOH) in Galactic hot molecular cores. It has been found that among nearly 120 interstellar and circumstellar molecular species identied to date, the more complex and saturated organic species are usually observed ...
Proceedings of the International Astronomical Union, 2005
Abstract. Rich molecular complexity has been shown to exist in star forming regions primarily thr... more Abstract. Rich molecular complexity has been shown to exist in star forming regions primarily through millimeter to submillimeter single-dish spectral line surveys or searches over the years. With a few case studies, we demonstrate that interferometric observations are a ...
We report a weak detection of HCN J=1--0 emission from comet C/1999 S4 (LINEAR) with the Berkeley... more We report a weak detection of HCN J=1--0 emission from comet C/1999 S4 (LINEAR) with the Berkeley-Illinois-Maryland Association (BIMA) Array in auto-correlation mode, in the three days prior to this comet's breakup on 2000 July 25 (M. Kidger, IAUC 7467). The antenna temperature of 3.5 +/- 1.0 mK in the 130'' beam suggests an outgassing rate at a few percent
ABSTRACT We present BIMA (Berkeley-Illinois-Maryland Association) array observations of the SiO v... more ABSTRACT We present BIMA (Berkeley-Illinois-Maryland Association) array observations of the SiO v \ 0, J \ 2»1 transition toward the Sgr B2 star formation region. The observations have angular and spectral resolutions of (a ] d) and 1.35 km s~1, respectively. Emission from ...
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Papers by Sheng-Yuan Liu