TENTATIVE DETECTION OF DEUTERATED METHANE TOWARD THE LOW-MASS PROTOSTAR IRAS 04368+2557 IN L1527

摘要: The millimeter-wave rotational transition line (J{sub K} = 1{sub 0}-0{sub 0}) of deuterated methane CH{sub 3}D has tentatively been detected toward the low-mass Class 0 protostar IRAS 04368+2557 in L1527 with Heinrich Hertz Submillimeter Telescope. This is first detection interstellar clouds, if confirmed. column density and fractional abundance are determined to be (9.1 {+-} 3.4) Multiplication-Sign 10{sup 15} cm{sup -2} (3.0 1.1) -7}, respectively, where we assume temperature 25 K. gaseous 4} estimated (1.3-4.6) 17} (4.3-15.2) -6}, by adopting molecular D/H ratios 2%-7% reported for various molecules L1527. higher than or comparable that found high-mass star-forming cores infrared observations. It sufficiently high trigger efficient production carbon-chain a lukewarm region near protostar, which supports scenario warm chemistry.