481 research outputs found
Observations of pre-stellar cores
Our understanding of the physical and chemical structure of pre-stellar
cores, the simplest star-forming sites, has significantly improved since the
last IAU Symposium on Astrochemistry (South Korea, 1999). Research done over
these years has revealed that major molecular species like CO and CS
systematically deplete onto dust grains at the interior of pre-stellar cores,
while species like N2H+ and NH3 survive in the gas phase and can usually be
detected towards the core centers. Such a selective behaviour of molecular
species gives rise to a differentiated (onion-like) chemical composition, and
manifests itself in molecular maps as a dichotomy between centrally peaked and
ring-shaped distributions. From the point of view of star-formation studies,
the identification of molecular inhomogeneities in cores helps to resolve past
discrepancies between observations made using different tracers, and brings the
possibility of self-consistent modelling of the core internal structure. Here I
present recent work on determining the physical and chemical structure of two
pre-stellar cores, L1498 and L1517B, using observations in a large number of
molecules and Monte Carlo radiative transfer analysis. These two cores are
typical examples of the pre-stellar core population, and their chemical
composition is characterized by the presence of large freeze out holes in most
molecular species. In contrast with these chemically processed objects, a new
population of chemically young cores has started to emerge. The characteristics
of its most extreme representative, L1521E, are briefly reviewed.Comment: 10 pages, 5 figures. To appear in IAU 231 conf. proc.
"Astrochemistry: Recent Successes and Current Challenges," eds. D.C. Lis,
G.A. Blake, and E. Herbs
Formation of Stellar Clusters and the Importance of Thermodynamics for Fragmentation
We discuss results from numerical simulations of star cluster formation in
the turbulent interstellar medium (ISM). The thermodynamic behavior of the
star-forming gas plays a crucial role in fragmentation and determines the
stellar mass function as well as the dynamic properties of the nascent stellar
cluster. This holds for star formation in molecular clouds in the solar
neighborhood as well as for the formation of the very first stars in the early
universe. The thermodynamic state of the ISM is a result of the balance between
heating and cooling processes, which in turn are determined by atomic and
molecular physics and by chemical abundances. Features in the effective
equation of state of the gas, such as a transition from a cooling to a heating
regime, define a characteristic mass scale for fragmentation and so set the
peak of the initial mass function of stars (IMF). As it is based on fundamental
physical quantities and constants, this is an attractive approach to explain
the apparent universality of the IMF in the solar neighborhood as well as the
transition from purely primordial high-mass star formation to the more normal
low-mass mode observed today.Comment: 10 pages, invited review, to appear in Dynamical Evolution of Dense
Stellar Systems, Proceed. of the IAU Symp. 246 (Capri, Sept. 2007), eds.
E.Vesperini, M. Giersz, and A. Sill
CCH in prestellar cores
We study the abundance of CCH in prestellar cores both because of its role in
the chemistry and because it is a potential probe of the magnetic field. We
also consider the non-LTE behaviour of the N=1-0 and N=2-1 transitions of CCH
and improve current estimates of the spectroscopic constants of CCH. We used
the IRAM 30m radiotelescope to map the N=1-0 and N=2-1 transitions of CCH
towards the prestellar cores L1498 and CB246. Towards CB246, we also mapped the
1.3 mm dust emission, the J=1-0 transition of N2H+ and the J=2-1 transition of
C18O. We used a Monte Carlo radiative transfer program to analyse the CCH
observations of L1498. We derived the distribution of CCH column densities and
compared with the H2 column densities inferred from dust emission. We find that
while non-LTE intensity ratios of different components of the N=1-0 and N=2-1
lines are present, they are of minor importance and do not impede CCH column
density determinations based upon LTE analysis. Moreover, the comparison of our
Monte-Carlo calculations with observations suggest that the non-LTE deviations
can be qualitatively understood. For L1498, our observations in conjunction
with the Monte Carlo code imply a CCH depletion hole of radius 9 x 10^{16} cm
similar to that found for other C-containing species. We briefly discuss the
significance of the observed CCH abundance distribution. Finally, we used our
observations to provide improved estimates for the rest frequencies of all six
components of the CCH(1-0) line and seven components of CCH(2-1). Based on
these results, we compute improved spectroscopic constants for CCH. We also
give a brief discussion of the prospects for measuring magnetic field strengths
using CCH.Comment: 14 pages, 13 figures, to be published in Astronomy and Astrophysic
Observing the gas temperature drop in the high-density nucleus of L 1544
Abridged: The thermal structure of a starless core is crucial for our
understanding of the physics in these objects and hence for our understanding
of star formation. Theory predicts a gas temperature drop in the inner 5000 AU
of these objects, but there has been little observational proof of this. We
performed VLA observations of the NH3 (1,1) and (2,2) transitions towards the
pre-stellar core L 1544 in order to measure the temperature gradient between
the high density core nucleus and the surrounding core envelope. Our VLA
observation for the first time provide measurements of gas temperature in a
core with a resolution smaller than 1000 AU. We have also obtained high
resolution Plateau de Bure observations of the 110 GHz 111-101 para-NH2D line
in order to further constrain the physical parameters of the high density
nucleus. We have estimated the temperature gradient using a model of the source
to fit our data in the u,v plane. We find that indeed the temperature decreases
toward the core nucleus from 12 K down to 5.5 K resulting in an increase of a
factor of 50% in the estimated density of the core from the dust continuum if
compared with the estimates done with constant temperature of 8.75 K. We also
found a remarkably high abundance of deuterated ammonia with respect to the
ammonia abundance (50%+-20%), which proves the persistence of nitrogen bearing
molecules at very high densities (2e6 cm-3) and shows that high-resolution
observations yield higher deuteration values than single-dish observations. Our
analysis of the NH3 and NH2D kinematic fields shows a decrease of specific
angular momentum from the large scales to the small scales.Comment: 12 pages, 6 figures. Accepted for publication by A&
Disk Properties and Density Structure of the Star-Forming Dense Core B335
We present subarcsecond resolution dust continuum observations of the
protostellar collapse candidate B335 made with the IRAM Plateau de Bure
Interferometer at wavelengths of 1.2 and 3.0 mm. These observations probe to <
100 AU size scales and reveal a compact source component that we identify with
a circumstellar disk. We analyze these data in concert with previous lower
resolution interferometer observations and find a best fit density structure
for B335 that consists of a power law envelope with index p=1.55 +/- 0.04 (r <
5000 AU) together with a disk (r < 100 AU) of flux F_{1.2 mm}=21 +/-2 mJy. We
estimate a systematic uncertainty in the power law index delta(p) < 0.15, where
the largest error comes from the assumed form of the dust temperature falloff
with radius. This determination of the inner density structure of B335 has a
precision unique amongst protostellar cores, and it is consistent with the
r^{-1.5} profile of gravitational free-fall, in accord with basic expectations
for the formation of a star. The flux (and implied mass) of the compact
component in B335 is typical of the disks around T Tauri stars.Comment: 16 pages, 2 figures. Accepted to the Astrophysical Journal, sched
v596 (2003 Oct 10
A Survey for Infall Motions toward Starless Cores. II. and Mapping Observations
We present the results of an extensive mapping survey of 53 `starless' cores
in the optically thick line of CS 2-1 and the optically thin lines of N2H+ 1-0
and C18O 1-0. The purpose of this survey was to search for signatures of
extended inward motions.
This study finds 10 `strong' and 9 `probable' infall candidates, based on
analysis and on the spectral shapes of CS lines.
From our analysis of the blue-skewed CS spectra and the
parameter, we find typical infall radii of 0.06-0.14 pc. Also, using a simple
two layer radiative transfer model to fit the profiles, we derive
one-dimensional infall speeds, half of whose values lie in the range of
0.05-0.09 km s. These values are similar to those found in L1544 by
Tafalla et al., and this result confirms that infall speeds in starless cores
are generally faster than expected from ambipolar diffusion in a strongly
sub-critical core. In addition, the observed infall regions are too extended to
be consistent with the `inside-out' collapse model applied to a very low-mass
star. In the largest cores, the spatial extent of the CS spectra with infall
asymmetry is larger than the extent of the core by a factor of
2-3. All these results suggest that extended inward motions are a common
feature in starless cores, and that they could represent a necessary stage in
the condensation of a star-forming dense core.Comment: Two tex files for manuscript and tables, and 38 figures. To appear in
ApJ
Shedding light on the formation of the pre-biotic molecule formamide with ASAI
Formamide (NH2CHO) has been proposed as a pre-biotic precursor with a key
role in the emergence of life on Earth. While this molecule has been observed
in space, most of its detections correspond to high-mass star-forming regions.
Motivated by this lack of investigation in the low-mass regime, we searched for
formamide, as well as isocyanic acid (HNCO), in 10 low- and intermediate-mass
pre-stellar and protostellar objects. The present work is part of the IRAM
Large Programme ASAI (Astrochemical Surveys At IRAM), which makes use of
unbiased broadband spectral surveys at millimetre wavelengths. We detected HNCO
in all the sources and NH2CHO in five of them. We derived their abundances and
analysed them together with those reported in the literature for high-mass
sources. For those sources with formamide detection, we found a tight and
almost linear correlation between HNCO and NH2CHO abundances, with their ratio
being roughly constant -between 3 and 10- across 6 orders of magnitude in
luminosity. This suggests the two species are chemically related. The sources
without formamide detection, which are also the coldest and devoid of hot
corinos, fall well off the correlation, displaying a much larger amount of HNCO
relative to NH2CHO. Our results suggest that, while HNCO can be formed in the
gas phase during the cold stages of star formation, NH2CHO forms most
efficiently on the mantles of dust grains at these temperatures, where it
remains frozen until the temperature rises enough to sublimate the icy grain
mantles. We propose hydrogenation of HNCO as a likely formation route leading
to NH2CHO.Comment: 26 pages, 9 figures. Accepted by Monthly Notices of the Royal
Astronomical Societ
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