Cosmic-ray induced ionisation and spatio-temporal correlations between supernova remnants and molecular clouds

International Cosmic Ray Conference, pp. 092

Abstract

MeV cosmic rays can penetrate dense molecular clouds and oftentimes dominate the ionisation, thus contributing to the physical and chemical dynamics of star forming regions. The effect of cosmic rays can be quantified by their ionisation rate. Interestingly, the ionisation rate predicted from the locally measured cosmic-ray intensities is one to two orders of magnitude lower than the observed ionisation rates. This disagreement is known as the ionisation puzzle. Previously, it was shown that the point-like nature of cosmic-ray sources, like supernova remnants implies a stochastic scatter in the stochastic ionisation rates. Drawing distances between clouds and sources randomly, the discrepancy between model and observations could be reduced. Here, we extend this model by considering spatial and temporal correlations between source and cloud positions. These are to be expected to a certain degree as supernova remnants are likely formed in the same cloud complexes. We will present the predictions for different assumptions on the correlations and compare to ionisation data.

Authors 12

1. Philipp Mertsch

   Technische Universität Berlin

   Affiliation as printed

   Zentrum für Astronomie und Astrophysik , Technische Universität Berlin , Hardenbergstraße 36 , D-10623 Berlin , Germany

2. Mareike Berkner
3. D. Breitschwerdt Aachen 𝑎 Institute for Theoretical Particle Physics and Cosmology (TTK)

   RWTH Aachen University

   Affiliation as printed

   𝑎 Institute for Theoretical Particle Physics and Cosmology (TTK) , RWTH Aachen University , Sommerfeldstr. 14 , 52074 Aachen , Germany

4. S. Gabici Aachen 𝑎 Institute for Theoretical Particle Physics and Cosmology (TTK)

   RWTH Aachen University

   Affiliation as printed

   𝑎 Institute for Theoretical Particle Physics and Cosmology (TTK) , RWTH Aachen University , Sommerfeldstr. 14 , 52074 Aachen , Germany

5. Matthias Hübl Aachen 𝑎 Institute for Theoretical Particle Physics and Cosmology (TTK)

   RWTH Aachen University

   Affiliation as printed

   𝑎 Institute for Theoretical Particle Physics and Cosmology (TTK) , RWTH Aachen University , Sommerfeldstr. 14 , 52074 Aachen , Germany

6. Hanno Jacobs Aachen 𝑎 Institute for Theoretical Particle Physics and Cosmology (TTK)

   RWTH Aachen University

   Affiliation as printed

   𝑎 Institute for Theoretical Particle Physics and Cosmology (TTK) , RWTH Aachen University , Sommerfeldstr. 14 , 52074 Aachen , Germany

7. Mattia Pacicco Aachen 𝑎 Institute for Theoretical Particle Physics and Cosmology (TTK)

   RWTH Aachen University

   Affiliation as printed

   𝑎 Institute for Theoretical Particle Physics and Cosmology (TTK) , RWTH Aachen University , Sommerfeldstr. 14 , 52074 Aachen , Germany

8. Enrico Peretti

   Arcetri Astrophysical Observatory · National Institute for Astrophysics

   Affiliation as printed

   INAF -Osservatorio Astrofisico di Arcetri , Largo Enrico Fermi 5 , Firenze , Italy

9. Giada Peron

   Arcetri Astrophysical Observatory · National Institute for Astrophysics

   Affiliation as printed

   INAF -Osservatorio Astrofisico di Arcetri , Largo Enrico Fermi 5 , Firenze , Italy

10. Sruthiranjani Ravikularaman
11. Michael M. Schulreich Aachen 𝑎 Institute for Theoretical Particle Physics and Cosmology (TTK)

    RWTH Aachen University

    Affiliation as printed

    𝑎 Institute for Theoretical Particle Physics and Cosmology (TTK) , RWTH Aachen University , Sommerfeldstr. 14 , 52074 Aachen , Germany

12. Vo Hong Minh Phan