2004A&A...415.1065H


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.08CEST03:53:08

2004A&A...415.1065H - Astronomy and Astrophysics, volume 415, 1065-1072 (2004/3-1)

The NH3/N2H+abundance ratio in dense cores.

HOTZEL S., HARJU J. and WALMSLEY C.M.

Abstract (from CDS):

We have observed the dense cores Barnard 217 (B217) and LDN 1262 (L1262) in the (J,K)=(1,1) and (2,2) inversion lines of ammonia and in the J=1-0 rotational line of diazenylium. The two cores are morphologically similar, in the sense that both contain a Class-I young stellar object (YSO) 1-2' away from the core centre. The NH3 and N2H+ column densities show the same pattern in both cores: the average NH3/N2H+ abundance ratios are 140-190 in the starless main bodies of the cores, while they drop to about 60-90 in the regions around the YSOs. Comparison with the dust continuum emission of B217 suggests that this pattern is due to an enhanced fractional ammonia abundance in the quiescent part of the core, where we find N(NH3)/N(H2)=5x10–8. On the outskirts of the core the fractional ammonia abundance is about 3x10–8, in accordance with our previous results. We discuss these findings in the light of recent chemical models including molecular depletion.

Abstract Copyright:

Journal keyword(s): ISM: individual objects: Barnard 217 - ISM: individual objects: LDN 1262 - ISM: abundances - ISM: molecules

Status at CDS:  

CDS comments: Table 1 : LDN 1262-YSO = IRAS F23238+7401, B217-YSO = IRAS 04248+2612.

Simbad objects: 7

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Number of rows : 7

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 Barnard 217 DNe 04 27 46.5 +26 17 52           ~ 85 0
2 JCMTSE J042747.7+261801 cor 04 27 48.5 +26 18 05           ~ 7 0
3 IRAS 04248+2612 Y*O 04 27 57.30696 +26 19 18.3036           M 142 0
4 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 668 0
5 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 434 1
6 PSCz Q23238+7401 Y*O 23 25 46.65 +74 17 37.2           ~ 54 1
7 LDN 1262 MoC 23 25 47 +74 17.6           ~ 130 0

    Equat.    Gal    SGal    Ecl

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2020.04.08-03:53:08

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