2019MNRAS.486.4805V


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.17CEST06:04:26

2019MNRAS.486.4805V - Mon. Not. R. Astron. Soc., 486, 4805-4812 (2019/July-2)

Nitrogen fractionation in external galaxies.

VITI S., FONTANI F., JIMENEZ-SERRA I. and HOLDSHIP J.

Abstract (from CDS):

In star-forming regions in our own Galaxy, the 14N/15N ratio is found to vary from ∼100 in meteorites, comets, and protoplanetary discs up to ∼1000 in pre-stellar and star-forming cores, while in external galaxies the very few single-dish large-scale measurements of this ratio lead to values of 100-450. The extent of the contribution of isotopic fractionation to these variations is, to date, unknown. In this paper, we present a theoretical chemical study of nitrogen fractionation in external galaxies in order to determine the physical conditions that may lead to a spread of the 14N/15N ratio from the solar value of ∼440 and hence evaluate the contribution of chemical reactions in the interstellar medium (ISM) to nitrogen fractionation. We find that the main cause of ISM enrichment of nitrogen fractionation is high gas densities, aided by high fluxes of cosmic rays.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

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

Simbad objects: 10

goto Full paper

goto View the reference in ADS

Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2857 2
2 M 77 GiP 02 42 40.771 -00 00 47.84 9.70 9.61 8.87 10.1 9.9 ~ 3981 2
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14323 1
4 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5210 6
5 IC 694 G 11 28 27.312 +58 34 42.29   18.2       ~ 232 2
6 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1228 2
7 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3680 4
8 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2157 2
9 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2617 4
10 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 10997 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2019MNRAS.486.4805V and select 'bookmark this link' or equivalent in the popup menu


2019.10.17-06:04:26

© Université de Strasbourg/CNRS

    • Contact