2012A&A...541L..11P


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.10CET14:42:54

2012A&A...541L..11P - Astronomy and Astrophysics, volume 541, L11-11 (2012/5-1)

Detection of the hydroperoxyl radical HO2 toward ρ Ophiuchi A. Additional constraints on the water chemical network.

PARISE B., BERGMAN P. and DU F.

Abstract (from CDS):

Hydrogen peroxide (HOOH) was recently detected toward ρ Oph A. Subsequent astrochemical modeling that included reactions in the gas phase and on the surface of dust grains was able to explain the observed abundance, and highlighted the importance of grain chemistry in the formation of HOOH as an intermediate product in water formation. This study also predicted that the hydroperoxyl radical HO2, the precursor of HOOH, should be detectable. We aim at detecting the hydroperoxyl radical HO2 in ρ Oph A. We used the IRAM 30 m and the APEX telescopes to target the brightest HO2 lines at about 130 and 260GHz. We detect five lines of HO2 (comprising seven individual molecular transitions). The fractional abundance of HO2 is found to be about 10–10, a value similar to the abundance of HOOH. This observational result is consistent with the prediction of the above mentioned astrochemical model, and thereby validates our current understanding of the water formation on dust grains. This detection, anticipated by a sophisticated gas-grain chemical model, demonstrates that models of grain chemistry have improved tremendously and that grain surface reactions now form a crucial part of the overall astrochemical network.

Abstract Copyright:

Journal keyword(s): astrochemistry - line: identification - ISM: abundances - ISM: molecules - ISM: individual objects: ρ Ophiuchi A

Simbad objects: 12

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Number of rows : 12

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 WOS 48 C* 15 23 05.0744336371 -51 25 58.881494593   17.85 16.66 14.51 10.18 C 117 1
2 * rho Oph A * 16 25 35.142 -23 26 49.90 4.3 5.22 5.05     B2/3V 382 0
3 QSO B1622-297 QSO 16 26 06.02083867 -29 51 26.9710860   18.41 20.5 17.6   ~ 354 0
4 NAME rho Oph A Cloud MoC 16 26 26.4 -24 22 33           ~ 236 1
5 NAME rho Oph A SM 1 cor 16 26 27.60 -24 23 55.0           ~ 57 0
6 RAFGL 1922 C* 17 07 58.110 -24 44 31.18           C-rich 57 0
7 QSO B1730-130 QSO 17 33 02.70578476 -13 04 49.5481484   18 18.5 18.78   ~ 959 1
8 QSO B1741-038 QSO 17 43 58.85613396 -03 50 04.6166450     18.5 17.98   ~ 467 1
9 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 500 1
10 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1860 1
11 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 326 1
12 NAME IRAS 16293-2422 East Red Lobe PoC ~ ~           ~ 9 0

    Equat.    Gal    SGal    Ecl

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2019.12.10-14:42:54

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