2008A&A...480L...5H


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.14CET18:51:56

2008A&A...480L...5H - Astronomy and Astrophysics, volume 480, L5-8 (2008/3-2)

CN in prestellar cores.

HILY-BLANT P., WALMSLEY M., PINEAU DES FORETS G. and FLOWER D.

Abstract (from CDS):

Determining the structure of and the velocity field in prestellar cores is essential to understanding protostellar evolution. We have observed the dense prestellar cores L 1544 and L 183 in the N=1->0 rotational transition of CN and 13CN in order to test whether CN is depleted in the high-density nuclei of these cores. We have used the IRAM 30m telescope to observe along the major and minor axes of these cores. We compare these observations with the 1 mm dust emission, which serves as a proxy for the hydrogen column density. We find that while CN(1-0) is optically thick, the distribution of 13CN(1-0)intensity follows the dust emission well, implying that the CN abundance does not vary greatly with density. We derive an abundance ratio of [CN]/[H2]=10–9 in L 183 and 13x10–9 in L 1544, which, in the case of L 183, is similar to previous estimates obtained by sampling lower-density regions of the core. We conclude that CN is not depleted towards the high-density peaks of these cores and thus behaves like the N-containing molecules N2H and NH3. CN is, to our knowledge, the first C-containing molecule to exhibit this characteristic.

Abstract Copyright:

Journal keyword(s): ISM: abundances - ISM: individual objects: L 1544 - ISM: individual objects: L 183

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME [BM89] L1498 PoC 04 10 51.4 +25 09 58           ~ 187 0
2 LDN 1498 DNe 04 11.0 +24 58           ~ 241 0
3 NAME [BM89] L1517B cor 04 55 18.8 +30 38 04           ~ 127 0
4 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 655 0
5 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 434 1
6 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 674 1

    Equat.    Gal    SGal    Ecl

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2019.11.14-18:51:56

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