2019ApJ...884..176I

Query : 2019ApJ...884..176I

2019ApJ...884..176I - Astrophys. J., 884, 176-176 (2019/October-3)

Gas and dust temperature in prestellar cores revisited: new limits on cosmic-ray ionization rate.

IVLEV A.V., SILSBEE K., SIPILA O. and CASELLI P.

Abstract (from CDS):

We develop a self-consistent model for the equilibrium gas temperature and size-dependent dust temperature in cold, dense, prestellar cores, assuming an arbitrary power-law size distribution of dust grains. Compact analytical expressions applicable to a broad range of physical parameters are derived and compared with predictions of the commonly used standard model. It is suggested that combining the theoretical results with observations should allow us to constrain the degree of dust evolution and the cosmic-ray ionization rate in dense cores, and to help with discriminating between different regimes of cosmic-ray transport in molecular clouds. In particular, assuming a canonical MRN distribution of grain sizes, our theory demonstrates that the gas-temperature measurements in the prestellar core L1544 are consistent with an ionization rate as high as ∼10–16 s–1, an order of magnitude higher than previously thought.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): Dark interstellar clouds - Astrophysical dust processes - Cosmic rays

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 965 0

Query : 2019ApJ...884..176I

Basic data :
LDN 1544 -- Dark Cloud (nebula)
Other object types: otypes_help 		DNe (LDN)
ICRS coord. (ep=J2000) : 		05 04 16.6 +25 10 48 (Radio) [ ] D 2004ApJS..152...81P
FK4 coord. (ep=B1950 eq=1950) : 		05 01 12.5 +25 06 40 [ ]
Gal coord. (ep=J2000) : 		177.9797 -09.7308 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 6.95 [~] / z(~) 0.000023 [~] / cz 6.95 [~]
   D 1978ApJ...221L.117H
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LDN 1544

References (965 between 1850 and 2026) (Total 965)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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