2008A&A...477L...5V


C.D.S. - SIMBAD4 rel 1.7 - 2020.04.04CEST17:59:25

2008A&A...477L...5V - Astronomy and Astrophysics, volume 477, L5-8 (2008/1-1)

Detection of extragalactic H3O+.

VAN DER TAK F.F.S., AALTO S. and MEIJERINK R.

Abstract (from CDS):

The H3O+ molecule probes the oxygen chemistry and the ionization rate of dense circumnuclear gas in galaxies. Recent H3O+ observations show variations in the cosmic-ray ionization rate by factors of >10 within our Galaxy. Using the JCMT, we have observed the 364 GHz line of p-H3O+ in the centers of M82 and Arp 220. In Arp 220, the line profile suggests that the emission originates in the Western nucleus. In M 82, both the eastern molecular peak and the circumnuclear region contribute to the emission. The derived column densities, abundances, and H3O+/H2O ratios indicate ionization rates similar to or even exceeding that in the Galactic Center. Model calculations of the chemistry of irradiated molecular gas indicate a likely origin of this high ionization rate in the extended, evolved starburst of M82. In contrast, irradiation by X-rays from the AGN disk is the most likely model for Arp 220.

Abstract Copyright:

Journal keyword(s): galaxies: starburst - galaxies: active - radio lines: galaxies - ISM: molecules

Status at CDS:  

Simbad objects: 4

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Number of rows : 4

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 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5287 6
2 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2658 4
3 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11319 0
4 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1886 1

    Equat.    Gal    SGal    Ecl

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2020.04.04-17:59:25

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