Query : 2010A&A...518A..26W

2010A&A...518A..26W - Astronomy and Astrophysics, volume 518, A26-26 (2010/7-2)

First interstellar detection of OH+.


Abstract (from CDS):

The Atacama Pathfinder Experiment (APEX) 12 m telescope was used to observe the N=1-0, J=0-1 ground-state transitions of OH+ at 909.1588GHz with the CHAMP+ heterodyne array receiver. Two blended hyperfine structure transitions were detected in absorption against the strong continuum source Sagittarius B2(M) and in several pixels offset by 18''. Both absorption from Galactic center gas and absorption from diffuse clouds in intervening spiral arms in a velocity range from -116 to 38.5km/s is observed. The total OH+ column density of absorbing gas is 2.4x1015cm–2. A column density local to Sgr B2(M) of 2.6x1014cm–2 is found. On the intervening line-of-sight, the column density per unit velocity interval is in the range of 1 to 40x1012/cm2/(km/s). OH+ is found to be on average more abundant than other hydrides, such as SH+ and CH+. Abundance ratios of OH and atomic oxygen to OH+ are found in the range of 101–2 and 103–4, respectively. The detected absorption of a continuous velocity range on the line-of-sight shows OH+ to be an abundant component of diffuse clouds.

Abstract Copyright:

Journal keyword(s): astrochemistry - ISM: abundances - ISM: molecules

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2872 4
2 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13430 0
3 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2147 1
4 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 380 1

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