Detection of HCO$^{+}$ emission toward the PN K 3-35
نویسندگان
چکیده
منابع مشابه
Kinematics of the H 2 O masers at the centre of the PN K 3 - 35
We have studied the kinematics traced by the water masers located at the centre of the planetary nebula (PN) K3-35, using data from previous Very Large Array (VLA) observations. An analysis of the spatial distribution and line-of-sight velocities of the maser spots allows us to identify typical patterns of a rotating and expanding ring in the position-velocity diagrams, according to our kinemat...
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We report the detection of HCO(J=1→0) emission towards the Cloverleaf quasar (z = 2.56) through observations with the Very Large Array. This is the first detection of ionized molecular gas emission at high redshift (z > 2). HCO emission is a star formation indicator similar to HCN, tracing dense molecular hydrogen gas (n(H2) ≃ 10 5 cm) within star–forming molecular clouds. We derive a lensing–c...
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K 3-35 is a planetary nebula (PN) where H2O maser emission has been detected, suggesting that it departed from the proto-PNe phase only some decades ago. Interferometric VLA observations of the OH 18 cm transitions in K 3-35 are presented. OH maser emission is detected in all four ground state lines (1612, 1665, 1667, and 1720 MHz). All the masers appear blueshifted with respect to the systemic...
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A plausible model is proposed for the enhancement of the abundance of molecular species in bipolar outflow sources. In this model, levels of HCO + enhancement are considered based on previous chemical calculations, that are assumed to result from shock-induced desorption and photoprocessing of dust grain ice mantles in the boundary layer between the outflow jet and the surrounding envelope. A r...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2006
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921306004042