2005A&A...438..915B


Query : 2005A&A...438..915B

2005A&A...438..915B - Astronomy and Astrophysics, volume 438, 915-922 (2005/8-2)

Destruction of formic acid by soft X-rays in star-forming regions.

BOECHAT-ROBERTY H.M., PILLING S. and SANTOS A.C.F.

Abstract (from CDS):

Formic acid is much more abundant in the solid state, both in interstellar ices and cometary ices, than in the interstellar gas (ice/gas∼104) and this point remains a puzzle. The goal of this work is to experimentally study ionization and photodissociation processes of HCOOH (formic acid), a glycine precursor molecule. The measurements were taken at the Brazilian Synchrotron Light Laboratory (LNLS), employing soft X-ray photons from toroidal grating monochromator TGM) beamline (200-310eV). Mass spectra were obtained using photoelectron photoion coincidence (PEPICO) method. Kinetic energy distributions and abundances for each ionic fragment have been obtained from the analysis of the corresponding peak shapes in the mass spectra. Photoionization and photodissociation cross sections were also determined. Due to the large photodissociation cross section of HCOOH it is possible that in PDRs regions, just after molecules evaporation from the grain surface, formic acid molecules are almost totally destroyed by soft X-rays, justifying the observed low abundance of HCOOH in the gaseous phase. The preferential path for the glycine formation from formic acid may be through the ice phase reaction.

Abstract Copyright:

Journal keyword(s): astrochemistry - molecular processes - ISM: abundances - ISM: molecules - X-rays: ISM - astrobiology

CDS comments: In paragraph 1 NGC 133-IRAS4A is a misprint for NGC 1333-IRAS4A (= [JCC87] IRAS 4A in Simbad).

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 M 77 GiP 02 42 40.7091669408 -00 00 47.859690204 9.70 9.61 8.87 10.1 9.9 ~ 4322 2
2 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 669 1
3 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 473 0
4 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 582 0
5 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2153 1
6 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 692 2
7 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1158 1
8 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2092 1
9 W 51 SNR 19 23 50 +14 06.0           ~ 1209 1
10 IRAS 23118+6110 Y*O 23 14 01.63 +61 27 20.2           ~ 360 0

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2022.05.20-15:12:37

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