NEWLY IDENTIFIED EXTENDED GREEN OBJECTS (EGOs) FROM THE
                    <i>SPITZER</i>
                    GLIMPSE II SURVEY. II. MOLECULAR CLOUD ENVIRONMENTS

Chen, Xi; Gan, Cong-Gui; Ellingsen, S. P.; He, Jianhua; Shen, Zhi-Qiang; Titmarsh, Anita

doi:10.1088/0067-0049/206/2/22

Cited by 29 publications

(23 citation statements)

References 98 publications

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“…(1) in Chen et al (2013). The derived parameters are listed in Table 4 Purcell et al 2006), the optical depths of HCO + (1-0) should be in the range of 9.0 to 33.5, consistent with our assumptions.…”

Section: Column Densitiessupporting

confidence: 83%

A molecular line study towards massive extended green object clumps in the southern sky: chemical properties

Wang

2015

Monthly Notices of the Royal Astronomical Society

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Section: Column Densitiessupporting

confidence: 83%

A molecular line study towards massive extended green object clumps in the southern sky: chemical properties

Wang

2015

Monthly Notices of the Royal Astronomical Society

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“…In contrast, the median and average of the HCO + emission line widths are 3.47 km s −1 and 3.65 km s −1 , respectively. The line widths of the HCO + emission in most sources is in the range 2.5-4.5 km s −1 and similar results are observed in thermal CS and HNC emission associated with class I methanol masers (Chen et al 2013b). For line widths greater than 2.5 km s −1 , there are fewer methanol sources than HCO + sources.…”

Section: Searches For 95 Ghz Methanol Masers: 1994-2016supporting

confidence: 79%

A New 95 GHz Methanol Maser Catalog. I. Data

Yang

Chen

et al. 2017

ApJS

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The Purple Mountain Observatory 13.7 m radio telescope has been used to search for 95 GHz (8 0 -7 1 A + ) class I methanol masers toward 1020 Bolocam Galactic Plane Survey (BGPS) sources, leading to 213 detections. We have compared the line width of the methanol and HCO + thermal emission in all of the methanol detections, and on that basis, we find that 205 of the 213 detections are very likely to be masers. This corresponds to an overall detection rate of 95 GHz methanol masers toward our BGPS sample of 20%. Of the 205 detected masers, 144 (70%) are new discoveries. Combining our results with those of previous 95 GHz methanol maser searches, a total of 481 95 GHz methanol masers are now known. We have compiled a catalog listing the locations and properties of all known 95 GHz methanol masers.

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“…Therefore, one should keep in mind that the comparison of both column densities and abundances in this section has not fully taken into account all sources of uncertainty. The beam averaged CH3OH column densities of our EGO cloud cores are in the range of ∼ 10 13 to ∼ 10 15 cm −2 , which are very similar to that found by Chen et al (2013b) toward a newer sample of EGOs identified from GLIMPSE II survey. They are also on the same orders of magnitude as that obtained toward other cloud cores in literature.…”

Section: Beam-averaged Column Densitiessupporting

confidence: 81%

“…The beam averaged CH3OH column densities of our EGO cloud cores are in the range of ∼ 10 13 to ∼ 10 15 cm −2 , which are very similar to that found by Chen et al (2013b) toward a newer sample of EGOs identified from GLIMPSE II survey. They are also on the same orders of magnitude as that obtained toward other cloud cores in literature.…”

Section: Beam-averaged Column Densitiessupporting

confidence: 81%

Early-stage star-forming cloud cores in Galactic Legacy Infrared Mid-Plane Survey (GLIMPSE) extended green objects (EGOs) as traced by organic species

Chen

et al. 2014

Monthly Notices of the Royal Astronomical Society

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In order to investigate the physical and chemical properties of massive star forming cores in early stages, we analyse the excitation and abundance of four organic species, CH 3 OH, CH 3 OCH 3 , HCOOCH 3 and CH 3 CH 2 CN, toward 29 Extended Green Object (EGO) cloud cores that were observed by our previous single dish spectral line survey. The EGO cloud cores are found to have similar methanol J 3 −J 2 rotation temperatures of ∼ 44 K, a typical linear size of ∼ 0.036 pc, and a typical beam averaged methanol abundance of several 10 −9 (the beam corrected value could reach several 10 −7 ). The abundances of the latter three species, normalized by that of methanol, are found to be correlated also across a large variety of clouds such as EGO cloud cores, hot corinos, massive hot cores and Galactic Center clouds. The chemical properties of the EGO cloud cores lie between that of hot cores and hot corinos. However, the abundances and abundance ratios of the four species can not be satisfactorily explained by recent chemical models either among the EGO cloud cores or among the various types of cloud cores from literature.

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NEWLY IDENTIFIED EXTENDED GREEN OBJECTS (EGOs) FROM THE SPITZER GLIMPSE II SURVEY. II. MOLECULAR CLOUD ENVIRONMENTS

Cited by 29 publications

References 98 publications

A molecular line study towards massive extended green object clumps in the southern sky: chemical properties

A molecular line study towards massive extended green object clumps in the southern sky: chemical properties

A New 95 GHz Methanol Maser Catalog. I. Data

Early-stage star-forming cloud cores in Galactic Legacy Infrared Mid-Plane Survey (GLIMPSE) extended green objects (EGOs) as traced by organic species

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