2017A&A...598A..22B

Query : 2017A&A...598A..22B

2017A&A...598A..22B - Astronomy and Astrophysics, volume 598A, 22-22 (2017/2-1)

CN radical hydrogenation from solid H2 reactions, an alternative way of HCN formation in the interstellar medium.

BORGET F., MULLER S., GROTE D., THEULE P., VINOGRADOFF V., CHIAVASSA T. and SANDER W.

Abstract (from CDS):

Context. Molecular hydrogen (H2) is the most abundant molecule of the interstellar medium (ISM) in gas phase and it has been assumed to exist in solid state or as coating on grains.
Aims. Our goal is to show that solid H2 can act as a hydrogenation agent, reacting with CN radicals to form HCN.
Methods. In a H2 matrix, we studied the hydrogenation of the CN radical generated from the vacuum ultraviolet photolysis (VUV-photolysis) of C2N2 at 3.8K. We modified the wavelengths and the host gas in order to be sure that CN radicals can abstract H from H2 molecules.
Results. HCN monomers, dimers, and oligomers have been characterised by Fourier transform infrared spectroscopy (FTIR). H2CN as well as CN radicals have also been clearly observed during the photolysis performed at 3.8K.
Conclusions. H2 is a hydrogenation reagent towards CN radicals producing HCN. This type of reaction should be taken into account for the reactivity at low temperature in contaminated H2 ice macro-particles (CHIMPs), H2 flakes or in the first sublayers of grains where solid H2 has accumulated.

Abstract Copyright: © ESO, 2017

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

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 - 2024 		#notes
1 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2263 1

Query : 2017A&A...598A..22B

Basic data :
NAME Sgr B2 -- Molecular Cloud
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types: 		MoC (), SFR (2016MNRAS), X ([SKM2002])
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  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
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  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) : 		17 47 20.4 -28 23 07 [ ] D ~
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) : 		17 44 10.6 -28 22 05 [ ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) : 		000.6667 -00.0362 [ ]
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
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  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz : 		V(km/s) 61.6 [~] / z(~) 0.000205 [~] / cz 61.61 [~]
   D 1973ApJ...181..781F
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  • also GMC

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NAME Sagittarius B2 NAME Sgr B2 [SKM2002] G000.7+1

References (2263 between 1850 and 2024) (Total 2263)
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