2014A&A...567A.101P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.04CEST14:05:19

2014A&A...567A.101P - Astronomy and Astrophysics, volume 567A, 101-101 (2014/7-1)

Estimates of relativistic electron and proton energy densities in starburst galactic nuclei from radio measurements.

PERSIC M. and REPHAELI Y.

Abstract (from CDS):

The energy density of energetic protons, Up, in several nearby starburst nuclei (SBNs) has been directly deduced from γ-ray measurements of the radiative decay of π0 produced in interactions with ambient protons. Lack of sufficient sensitivity and spatial resolution makes this direct deduction unrealistic in the foreseeable future for even a moderately distant SBN. A more viable indirect method for determining Up in star-forming galaxies is to use its theoretically based scaling to the energy density of energetic electrons, Ue, which can be directly deduced from radio synchrotron and possibly also nonthermal hard X-ray emission. In order to improve the quantitative basis and diagnostic power of this leptonic method we reformulate and clarify its main aspects. Doing so we obtain a basic expression for the ratio Up/Ue in terms of the proton and electron masses and the power-law indices that characterize the particle spectral distributions in regions where the total particle energy density is at equipartition with that of the mean magnetic field. We also express the field strength and the particle energy density in the equipartition region in terms of the region's size, mean gas density, IR and radio fluxes, and distance from the observer, and determine values of Up in a sample of nine nearby and local SBNs.

Abstract Copyright:

Journal keyword(s): astroparticle physics - ISM: magnetic fields - cosmic rays - galaxies: magnetic fields - galaxies: starburst

Simbad objects: 12

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Number of rows : 12

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 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2929 2
2 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5331 6
3 NGC 3628 GiP 11 20 17.018 +13 35 22.16   10.42 9.48 9.22   ~ 750 3
4 IC 694 G 11 28 27.312 +58 34 42.29   18.2       ~ 236 2
5 NGC 3690 IG 11 28 31.326 +58 33 41.80   13.19 12.86     ~ 883 4
6 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1264 2
7 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2228 2
8 NGC 5945 LIN 15 29 45.000 +42 55 07.39   14.1       ~ 55 0
9 APG 220A PoG 15 34 57.22 +23 30 11.4           ~ 43 1
10 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2679 4
11 APG 220B PoG 15 34 57.28 +23 30 11.3           ~ 33 1
12 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2234 2

    Equat.    Gal    SGal    Ecl

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2020.07.04-14:05:19

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