2005ApJ...627L.121J


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.25CET15:13:28

2005ApJ...627L.121J - Astrophys. J., 627, L121-L124 (2005/July-2)

Grain evolution across the shocks in the L1448-mm outflow.

JIMENEZ-SERRA I., MARTIN-PINTADO J., RODRIGUEZ-FRANCO A. and MARTIN S.

Abstract (from CDS):

The recent detection of shock precursors toward the very young L1448-mm outflow offers us the possibility to study the grain chemistry during the first stages of the shock evolution, constraining the molecules ejected from grains and the species formed in gas phase. Observations of key molecules in the grain chemistry such as SiO, CH3OH, SO, CS, H2S, OCS, and SO2 toward this outflow are presented. The line profiles and the derived abundances show three distinct velocity regimes that trace the shock evolution: the preshock, the shock precursor, and the postshock gas. The SiO, CH3OH, SO, and CS abundances are enhanced with respect to the quiescent gas by 1 order of magnitude in the shock-precursor component, and by 3 orders of magnitude in the postshock gas. The derived SiO and CH3OH abundances are consistent with the recent ejection of these molecules from grains. Since H2S is only enhanced in the shock-precursor component and OCS and SO2are undetected, SO and CS are the most abundant sulfur-bearing species in the grain mantles of L1448-mm. The ejection of mainly SO and CS rather than H2S or OCS from grains suggests that the sulfur chemistry will depend on the chemical ``history'' of the grain mantles in outflows and hot cores.:

Abstract Copyright:

Journal keyword(s): ISM: Individual: Alphanumeric: L1448 - ISM: Jets and Outflows - Stars: Formation

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 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2880 2
2 LDN 1448 DNe 03 22.5 +30 35           ~ 462 0
3 [SDA2014] West4 Y*O 03 25 38.83 +30 44 06.2           ~ 241 1
4 NAME LDN 1448-mm Y*O 03 25 38.83 +30 44 06.2           ~ 295 0
5 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1333 0
6 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 675 1
7 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1011 1

    Equat.    Gal    SGal    Ecl

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2020.01.25-15:13:28

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