2009A&A...498L...9G


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET13:42:26

2009A&A...498L...9G - Astronomy and Astrophysics, volume 498, L9-12 (2009/5-1)

Detection of 15NH2D in dense cores: a new tool for measuring the 14N/15N ratio in the cold ISM.

GERIN M., MARCELINO N., BIVER N., ROUEFF E., COUDERT L.H., ELKEURTI M., LIS D.C. and BOCKELEE-MORVAN D.

Abstract (from CDS):

Ammonia is one of the most reliable tracers of cold dense cores. It is also a minor constituent of interstellar ices and, as such, one of the important nitrogen reservoirs in the protosolar nebula, together with the gas phase nitrogen, in the form of N2 and N. An important diagnostic of the various nitrogen sources and reservoirs of nitrogen in the Solar System is the 14N/15N isotopic ratio. While good data exist for the Solar System, corresponding measurements in the interstellar medium are scarce and of low quality. Following the successful detection of the singly, doubly, and triply deuterated isotopologues of ammonia, we searched for 15NH2D in dense cores, as a new tool for investigating the 14N/15N ratio in dense molecular gas. With the IRAM-30m telescope, we obtained deep integrations of the ortho 15NH2D (11,1-10,1) line at 86.4GHz, simultaneously with the corresponding ortho NH2D line at 85.9GHz. The ortho 15NH2D (11,0-10,1) is detected in Barnard-1b, NGC1333-DCO+, and L1689N, while we obtained upper limits towards LDN1544 and NGC1333-IRAS4A, and a tentative detection towards L134N(S). The para line at 109 GHz remains undetected at the rms noise level achieved. The 14N/15N abundance ratio in 15NH2D ranges between 350 and 850, similar to the protosolar value of ∼424, and likely higher than the terrestrial ratio of ∼270.

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Journal keyword(s): astrochemistry - ISM: clouds - ISM: molecules - ISM: general - radio lines: ISM

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME NGC 1333 DCO+ Cld 03 26 06.6 +31 03 08           ~ 4 0
2 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 623 1
3 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 470 0
4 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 568 0
5 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 171 0
6 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 716 0
7 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 435 1
8 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 698 1
9 LDN 1689N DNe 16 32 25.96 -24 28 46.2           ~ 110 0

    Equat.    Gal    SGal    Ecl

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2021.03.08-13:42:26

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