2010A&A...521L..15F


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.14CEST01:58:00

2010A&A...521L..15F - Astronomy and Astrophysics, volume 521, L15-15 (2010/10-1)

CH+(1-0) and 13CH+(1-0) absorption lines in the direction of massive star-forming regions.

FALGARONE E., GODARD B., CERNICHARO J., DE LUCA M., GERIN M., PHILLIPS T.G., BLACK J.H., LIS D.C., BELL T.A., BOULANGER F., COUTENS A., DARTOIS E., ENCRENAZ P., GIESEN T., GOICOECHEA J.R., GOLDSMITH P.F., GUPTA H., GRY C., HENNEBELLE P., HERBST E., HILY-BLANT P., JOBLIN C., KAZMIERCZAK M., KOLOS R., KRELOWSKI J., MARTIN-PINTADO J., MONJE R., MOOKERJEA B., NEUFELD D.A., PERAULT M., PEARSON J.C., PERSSON C., PLUME R., SALEZ M., SCHMIDT M., SONNENTRUCKER P., STUTZKI J., TEYSSIER D., VASTEL C., YU S., MENTEN K., GEBALLE T.R., SCHLEMMER S., SHIPMAN R., TIELENS A.G.G.M., PHILIPP S., CROS A., ZMUIDZINAS J., SAMOSKA L.A., KLEIN K., LORENZANI A., SZCZERBA R., PERON I., CAIS P., GAUFRE P., CROS A., RAVERA L., MORRIS P., LORD S. and PLANESAS P.

Abstract (from CDS):

We report the detection of the ground-state rotational transition of the methylidyne cation CH+ and its isotopologue 13CH+ toward the remote massive star-forming regions W33A, W49N, and W51 with the HIFI instrument onboard the Herschel satellite. Both lines are seen only in absorption against the dust continuum emission of the star-forming regions. The CH+ absorption is saturated over almost the entire velocity ranges sampled by the lines-of-sight that include gas associated with the star-forming regions (SFR) and Galactic foreground material. The CH+ column densities are inferred from the optically thin components. A lower limit of the isotopic ratio [12CH+]/[13CH+]>35.5 is derived from the absorptions of foreground material toward W49N. The column density ratio, N(CH+)/N(HCO+), is found to vary by at least a factor 10, between 4 and >40, in the Galactic foreground material. Line-of-sight 12CH+ average abundances relative to total hydrogen are estimated. Their average value, N(CH+)/NH>2.6x10–8, is higher than that observed in the solar neighborhood and confirms the high abundances of CH+ in the Galactic interstellar medium. We compare this result to the predictions of turbulent dissipation regions (TDR) models and find that these high abundances can be reproduced for the inner Galaxy conditions. It is remarkable that the range of predicted N(CH+)/N(HCO+) ratios, from 1 to ∼50, is comparable to that observed.

Abstract Copyright:

Journal keyword(s): astrochemistry - ISM: molecules - ISM: kinematics and dynamics - turbulence

Simbad objects: 7

goto Full paper

goto View the reference in ADS

Number of rows : 7

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 NAME Orion Bright Bar reg 05 35 22.30 -05 24 33.0           ~ 719 0
2 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 333 1
3 W 33a Y*O 18 14 39.0 -17 52 03           ~ 584 0
4 W 49n HII 19 10 13.2 +09 06 12           ~ 414 3
5 W 51 SNR 19 23 50 +14 06.0           ~ 1145 1
6 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 946 0
7 NGC 7027 PN 21 07 01.8 +42 14 10   9.1 10.9     ~ 2327 1

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2010A&A...521L..15F and select 'bookmark this link' or equivalent in the popup menu


2020.08.14-01:58:00

© Université de Strasbourg/CNRS

    • Contact