35 citations · 172 across the 12 of their papers we have counts for
12 papers
A Possible Chemical Clock in High-mass Star-forming Regions: N(HC3N)/N(N2H+)?
Y. X. Wang, J. S. Zhang, H. Z. Yu +5
We conducted observations of multiple HC3N (J = 10-9, 12-11, and 16-15) lines and the N2H+ (J = 1-0) line toward a large sample of 61 ultracompact (UC) H II regions, through the In…
Molecules in the peculiar age-defying source IRAS 19312+1950
Jian-Jie Qiu, Yong Zhang, Jun-ichi Nakashima +5
Context. IRAS 19312+1950 is an isolated infrared source that exhibits a characteristic quasi-point-symmetric morphology in the near- and mid-infrared images and is also very bright…
Non-detection of Broad Hydrogen Radio Recombination Lines in Circinus Galaxy
Junzhi Wang, Yong Shi, Zhi-Yu Zhang +5
The line widths of broad line regions (BLRs) of AGNs are key parameters for understanding the central super massive black holes (SMBHs). However, due to obscuration from dusty toru…
Molecules in the carbon-rich protoplanetary nebula CRL 2688
Jian-Jie Qiu, Yong Zhang, Jiang-Shui Zhang +1
We present observations of the carbon-rich protoplanetary nebula (PPN) CRL 2688 made with the Institut de Radioastronomie Millimetrique (IRAM) 30 m telescope in the 3mm and 2mm ban…
Molecular Oxygen in the nearest QSO Mrk 231
Junzhi Wang, Di Li, Paul F. Goldsmith +7
We report the detection of an emission feature at the 12 sigma level with FWHM line width of about 450 km/s toward the nearest quasi-stellar object, QSO Mrk 231. Based on observati…
λ = 2 mm spectroscopy observations toward the circumnuclear disk of NGC 1068
Jianjie Qiu, Jiangshui Zhang, Yong Zhang +2
Aims. We investigate the physical and chemical conditions of molecular gas in the circumnuclear disk (CND) region of NGC 1068. Methods. We carried out a spectral line survey with t…
Mapping Observations of complex organic molecules around Sagittarius B2 with ARO 12m telescope
Juan Li, Junzhi Wang, Haihua Qiao +10
We performed high-sensitivity mapping observations of several complex organic molecules around Sagittarius B2 with ARO 12m telescope at 3-mm wavelength. Based on their spatial dist…
Determining electron temperature and density in a H II region by using the relative strengths of hydrogen radio recombination lines
F. -Y. Zhu, Q. -F. Zhu, J. -Z. Wang +1
We have introduced a new method of estimating the electron temperature and density of H II regions by using single dish observations. In this method, multiple hydrogen radio recomb…
Millimeter Spectral Line Mapping Observations Toward Four Massive Star Forming HII Regions
Shanghuo Li, Junzhi Wang, Zhi-Yu Zhang +6
We present spectral line mapping observations toward four massive star-forming regions (Cepheus A, DR21S, S76E and G34.26+0.15), with the IRAM 30 meter telescope at 2 mm and 3 mm b…
The hydrodynamical models of the cometary compact H II region
Feng-Yao Zhu, Qing-Feng Zhu, Juan Li +2
We have developed a full numerical method to study the gas dynamics of cometary ultra-compact (UC) H II regions, and associated photodissociation regions (PDRs). The bow-shock and…
Sulfur-Bearing Molecules In Massive Star-Forming Regions: Observations Of OCS, CS, H2S and SO
Juan Li, Junzhi Wang, Qingfeng Zhu +2
We studied sulfur chemistry of massive star-forming regions through single-dish submillimeter spectroscopy. OCS, O13CS, 13CS, H2S and SO transitions were observed toward a sample o…
On the nuclear obscuration of H2O maser galaxies
J. S. Zhang, C. Henkel, Q. Guo +2
To shed light onto the circumnuclear environment of 22 GHz H2O maser galaxies, we have analyzed some of their multi-wavelength properties, including the far infrared luminosity (FI…