2011A&A...531L...1K


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.12CET12:37:51

2011A&A...531L...1K - Astronomy and Astrophysics, volume 531, L1-1 (2011/7-1)

Water in low-mass star-forming regions with Herschel (WISH-LM). High-velocity H2O bullets in L1448-MM observed with HIFI.

KRISTENSEN L.E., VAN DISHOECK E.F., TAFALLA M., BACHILLER R., NISINI B., LISEAU R. and YILDIZ U.A.

Abstract (from CDS):

Herschel-HIFI observations of water in the low-mass star-forming object L1448-MM, known for its prominent outflow, are presented, as obtained within the ``Water in star-forming regions with Herschel'' (WISH) key programme. Six H216O lines are targeted and detected (Eup/kB∼50-250K), as is CO J=10-9 (Eup/kB∼305K), and tentatively H218O 110-101 at 548GHz. All lines show strong emission in the ``bullets'' at |3|>50km/s from the source velocity, in addition to a broad, central component and narrow absorption. The bullets are seen much more prominently in H2O than in CO with respect to the central component, and show little variation with excitation in H2O profile shape. Excitation conditions in the bullets derived from CO lines imply a temperature >150K and density >105cm–3, similar to that of the broad component. The H2O/CO abundance ratio is similar in the ``bullets'' and the broad component, ∼0.05-1.0, in spite of their different origins in the molecular jet and the interaction between the outflow and the envelope. The high H2O abundance indicates that the bullets are H2 rich. The H2O cooling in the ``bullets'' and the broad component is similar and higher than the CO cooling in the same components. These data illustrate the power of Herschel-HIFI to disentangle different dynamical components in low-mass star-forming objects and determine their excitation and chemical conditions.

Abstract Copyright:

Journal keyword(s): astrochemistry - stars: formation - ISM: molecules - ISM: jets and outflows - ISM: individual objects: L1448

Simbad objects: 4

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Number of rows : 4

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 LDN 1448 DNe 03 22.5 +30 35           ~ 459 0
2 NAME LDN 1448-mm Y*O 03 25 38.83 +30 44 06.2           ~ 294 0
3 [SDA2014] West4 Y*O 03 25 38.83 +30 44 06.2           ~ 241 1
4 NGC 1333 SFR 03 28 55 +31 22.2   10.9       ~ 1187 1

    Equat.    Gal    SGal    Ecl

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2019.12.12-12:37:51

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