2011A&A...525A.119M


Query : 2011A&A...525A.119M

2011A&A...525A.119M - Astronomy and Astrophysics, volume 525A, 119-119 (2011/1-1)

Star formation in extreme environments: the effects of cosmic rays and mechanical heating.

MEIJERINK R., SPAANS M., LOENEN A.F. and VAN DER WERF P.P.

Abstract (from CDS):

The molecular interstellar medium in extreme environments, such as Arp 220, but also NGC 253 appears to have extremely high cosmic ray (CR) rates (103-104xMilky Way) and substantial mechanical heating from supernova driven turbulence. We explore the consequences of high CR rates and mechanical heating on the chemistry of the clouds.PDR model predictions are made for low, n=103, and high, n=105.5cm–3, density clouds using well-tested chemistry and radiation transfer codes. Column densities of relevant species are discussed, and special attention is given to water-related species. Fluxes are shown for fine-structure lines of O, C+, C, and N+, and molecular lines of CO, HCN, HNC, and HCO+. A comparison is made with an X-ray dominated region model.Fine-structure lines of [CII], [CI], and [OI] are remarkably similar for different mechanical heating and CR rates, when already exposed to large amounts of UV. Both HCN and H2O abundances are boosted for very high mechanical heating rates, while ionized species are relatively unaffected. Both OH+ and H2O+ are enhanced for very high CR rates ζ≥5x10–14s–1. A combination of OH+, OH, H2O+, H2O, and H3O+ traces the CR rates, and is able to distinguish between enhanced cosmic rays and X-rays.

Abstract Copyright:

Journal keyword(s): cosmic rays - galaxies: ISM - galaxies: active - galaxies: starburst - ISM: molecules

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 3048 2
2 Mrk 231 Sy1 12 56 14.2340989340 +56 52 25.238555193   14.68 13.84     ~ 1851 3
3 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2763 4
4 NGC 6334 HII 17 20 51 -36 06.9           ~ 619 0
5 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2032 1
6 GRS G081.70 +00.50 SFR 20 39 01.6 +42 19 38           O4.5 982 0

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2021.09.22-10:02:01

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