منابع مشابه
Protostars and Outflows in the NGC 7538 - IRS 9 Cloud Core
New high resolution observations of HCO J=1→0, HCN J=1→0, SO 22 → 11, and continuum with BIMA at 3.4 mm show that the NGC7538 IRS 9 cloud core is a site of active ongoing star formation. Our observations reveal at least three young bipolar molecular outflows, all ∼ 10,000 – 20,000 years old. IRS 9 drives a bipolar, extreme high velocity outflow observed nearly pole on. South of IRS 9 we find a ...
متن کاملHigh Resolution Mid-infrared Spectroscopy of Ngc 7538 Irs 1: Probing Chemistry in a Massive Young Stellar Object
We present high resolution (R = 75,000–100,000) mid-infrared spectra of the high-mass embedded young star IRS 1 in the NGC 7538 star-forming region. Absorption lines from many rotational states of C2H2, CCH2, CH3, CH4, NH3, HCN, HNCO, and CS are seen. The gas temperature, column density, covering factor, line width, and Doppler shift for each molecule are derived. All molecules were fit with tw...
متن کاملMethane Abundance Variations toward the Massive Protostar Ngc 7538 Irs 9
Absorption and emission lines originating from the 3 C H stretching manifold of gas-phase CH4 were discovered in the high-resolution (R 1⁄4 25;000) infrared L-band spectrum along the line of sight toward NGC 7538 IRS 9. These observations provide a diagnostic of the complex dynamics and chemistry in a massive star-forming region. The line shapes resemble P Cygni profiles with the absorption and...
متن کاملGround - state OH observations towards NGC 6334
We have made observations of the four hyperfine transitions of the 2Π3/2, J=3/2 ground state of OH at 1612, 1665, 1667 and 1720 MHz and the related 1.6-GHz continuum emission, towards NGC 6334 using the Australia Telescope Compact Array. The observations covered all the major radio continuum concentrations aligned along the axis of NGC 6334 (V, A to F). We have detected seven OH masers plus a p...
متن کاملInvestigating the Nature of the Dust Emission around Massive Protostar Ngc 7538 Irs 1: Circumstellar Disk and Outflow?
We have obtained high resolution mid-infrared images of the high mass protostar NGC 7538 IRS 1 using Michelle on Gemini North and find that the circumstellar dust associated with this source is extended on both large and small scales. The large-scale mid-infrared emission is asymmetric about the peak of IRS 1, being more extended to the northwest than the southeast. The position angle of the mi...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1982
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/198.1.265