2015A&A...581A..92J


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST19:14:07

2015A&A...581A..92J - Astronomy and Astrophysics, volume 581A, 92-92 (2015/9-1)

H2 formation via the UV photo-processing of a-C:H nano-particles.

JONES A.P. and HABART E.

Abstract (from CDS):

The photolysis of hydrogenated amorphous carbon, a-C(:H), dust by UV photon-irradiation in the laboratory leads to the release of H2 as well as other molecules and radicals. This same process is also likely to be important in the interstellar medium. We investigate molecule formation arising from the photo-dissociatively-driven, regenerative processing of a-C(:H) dust. We explore the mechanism of a-C(:H) grain photolysis leading to the formation of H2 and other molecules/radicals. The rate constant for the photon-driven formation of H2 from a-C(:H) grains is estimated to be 2x10–17cm3/s. In intense radiation fields photon-driven grain decomposition will lead to fragmentation into daughter species rather than H2 formation. The cyclic re-structuring of arophatic a-C(:H) nano-particles appears to be a viable route to formation of H2 for low to moderate radiation field intensities (1≲G0≲102), even when the dust is warm (T∼50-100K).

Abstract Copyright:

Journal keyword(s): dust, extinction - ISM: molecules - ISM: general

Simbad objects: 8

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Number of rows : 8

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 1097 LIN 02 46 19.059 -30 16 29.68 10.46 9.97 9.48 8.72 9.8 ~ 1173 3
2 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 480 0
3 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 716 0
4 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 445 0
5 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 570 1
6 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5336 6
7 NAME M 17 SW SFR 18 20 23.1 -16 11 43           ~ 249 0
8 NGC 7023 RNe 21 01 36.9 +68 09 48           ~ 630 0

    Equat.    Gal    SGal    Ecl

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2020.07.14-19:14:07

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