J/ApJ/459/686 Energy Deposition in Interstellar Dust Grains (Dwek+ 1996)
Energy Deposition and Photoelectric Emission from the Interaction of 10 eV
to 1 MeV Photons with Interstellar Dust Particles
Dwek E., Smith R.K.
<Astrophys. J. 459, 686 (1996)>
=1996ApJ...459..686D 1996ApJ...459..686D
ADC_Keywords: Extinction; Opacities; Interstellar medium
Description:
This catalog contains calculated tables of the energy deposition into dust
grains by photons with energies between 10 eV and 1 MeV. The tables give
the deposition for 60 different energies and 15 dust grain sizes. Tables
for both silicate and graphite grains are presented. Photoelectric
absorption, auger electrons, and Compton scattering are used in the
calculations, which were done with a Mie code when necessary and a particle
approach when appropriate.
The file graphite.dat corresponds to Table 5.1 in the source reference.
Silicate.dat corresponds to Table 5.2.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
silicate.dat 191 60 Deposition in silicate
graphite.dat 193 60 Deposition in graphite
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Byte-by-byte Description of file: graphite.dat silicate.dat
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Bytes Format Units Label Explanations
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1- 10 F10.2 eV Ephot Energy of incoming photon
13- 22 E10.4 eV E5nm *Energy deposition*Q_abs for grain size=5nm
25- 34 E10.4 eV E7nm *Energy deposition*Q_abs for grain size=7nm
37- 46 E10.4 eV E10nm *Energy deposition*Q_abs for grain size=10nm
49- 58 E10.4 eV E15nm *Energy deposition*Q_abs for grain size=15nm
61- 70 E10.4 eV E20nm *Energy deposition*Q_abs for grain size=20nm
73- 82 E10.4 eV E30nm *Energy deposition*Q_abs for grain size=30nm
85- 94 E10.4 eV E50nm *Energy deposition*Q_abs for grain size=50nm
97-106 E10.4 eV E70nm *Energy deposition*Q_abs for grain size=70nm
109-118 E10.4 eV E100nm *Energy deposition*Q_abs for grain size=100nm
121-130 E10.4 eV E150nm *Energy deposition*Q_abs for grain size=150nm
133-142 E10.4 eV E200nm *Energy deposition*Q_abs for grain size
145-154 E10.4 eV E300nm *Energy deposition*Q_abs for grain size=300nm
157-166 E10.4 eV E500nm *Energy deposition*Q_abs for grain size=500nm
169-178 E10.4 eV E700nm *Energy deposition*Q_abs for grain size=700nm
181-190 E10.4 eV E1um *Energy deposition*Q_abs for grain size=1micron
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Note on E5nm, E7nm, E10nm, E15nm, E20nm, E30nm, E50nm, E70nm, E100nm, E150nm:
Note on E200nm, E300nm, E500nm, E700nm, E1um:
These fields contain the energy deposition multiplied by Q_abs. Where
Q_abs is the dust absorption efficiency calculated from Mie theory.
The grain size indicated is the dust particle radius.
The total energy deposited in a dust particle of radius a is therefore
flux * pi a^2 * dt * table_value; the flux has units of photons per
cm^2 per second, pi a^2 is the geometric area of the dust, dt is the
length of time considered, and the table value contains both Q_abs
(which when multiplied by the geometric cross section gives the cross
section for absorption) and the energy deposited when that photon is
absorbed, which may be the entire photon's energy or some lesser
value.
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Acknowledgments:
The authors thank James Rathkopf and Rick Cullen from LLNL for the
Auger data, Peter Martin for the UV optical constants, and Alice Trenholm,
David Stoutamire, and Ari Laor for useful conversations.
The ADC thanks author R. Smith for providing the data and the original
ReadMe document.
Modifications:
9-July-1997 As submitted, the first record of each data file contained
a header record. These were removed to conform with CDS/ADC standards.
R. Smith's ReadMe was modified by J. Gass [SSDOO/ADC] to include
a byte-by-byte table and additional features of a standard document.
References:
Laor, A., Draine, B.T. 1993, ApJ 402, 441
=1993ApJ...402..441L 1993ApJ...402..441L
(End) Randall Smith [NASA/GSFC] & James Gass [SSDOO/ADC] 10-Jul-1997