Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...455l..73z&link_type=abstract
Astrophysical Journal Letters v.455, p.L73
Astronomy and Astrophysics
Astronomy
29
Ism: Abundances, Ism: Molecules, Line: Identification, Galaxy: Center
Scientific paper
The identification of interstellar HOC+ has been confirmed through new observations of this species at 3, 2, and 1.2 mm using the NRAO 12 m telescope. Toward Sgr B2 (OH), the J = 2 --> 1 and J = 3 --> 2 lines of this ion at 179 and 268 GHz were detected for the first time. In addition, the J = 1 --> 0 line of HOC+ at 89 GHz was observed toward several new sources, including Orion-KL. In conjunction with past observations of the J = 1 --> 0 transition toward Sgr B2 (OH), these data clearly establish the presence of this species in the interstellar medium. The column density toward Sgr B2 (OH) is estimated to be Ntot ~ 3 x 1012 cm-2, which corresponds to a fractional abundance relative to H2 of f ~ 10-12. Measurements of HCO+ were also carried out toward Sgr B2 (OH), resulting in an abundance ratio of [HCO+]/[HOC+] ~ 140--360 at gas densities of n(H2) > 105 cm-3. This ratio contradicts past predictions of ion-molecule models by several orders of magnitude and suggests that the reaction HOC+ + H2 --> HCO+ + H2 is not as fast as previously thought.
Apponi Aldo Joseph
Ziurys Lucy M.
No associations
LandOfFree
Confirmation of Interstellar HOC +: Reevaluating the [HCO +]/[HOC +] Abundance Ratio does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Confirmation of Interstellar HOC +: Reevaluating the [HCO +]/[HOC +] Abundance Ratio, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Confirmation of Interstellar HOC +: Reevaluating the [HCO +]/[HOC +] Abundance Ratio will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1258667