Splinter Meeting ISM

Confronting simulations of the interstellar medium with observations and measurements

Time: Wednesday September 23, 14:00-18:00 and Thursday September 24, 09:00-13:00 and 14:00-18:00 CEST (UTC+2)

Room: virtual room F

Convenor(s): Michael Schulreich, Dieter Breitschwerdt
TU Berlin

The interstellar medium (ISM) is highly turbulent, consists of multiple phases, and is characterized by complicated, mutually interacting structures on all resolvable spatial and temporal scales. As such, it can only be treated in its full non-linear complexity by means of numerical simulations, whose resolution, domain size, and number of included dimensions and physical processes goes hand in hand with the progress in computational capabilities. Depending on the volume range considered (and hence on the smallest region resolved), current works can be roughly divided into three classes: small-scale, meso-scale, and large scale. A physically realistic three-dimensional model that covers all dynamical ranges of an entire star-forming galaxy is still out of reach, though there are efforts to achieve this to some degree by coupling the adaptive mesh refinement technique with zoom-ins to specific regions.
As technology advances, also observations have improved dramatically in both depth and resolution, enriching our knowledge about the ISM as a whole and putting constraints on theoretical models and simulations. In the last few years these have been specifically X-ray observations to cover the hot ISM, (far-)infrared, submillimeter and radio facilities such as Spitzer, Herschel, ALMA, IRAM, SOFIA, LOFAR and many others to map star formation regions. In addition, a new branch of research, deep-sea astronomy, has been established during the past two decades, which is dedicated to the search and analysis of radioisotopic signatures of cosmic events, such as recent nearby supernova explosions, in the ocean floor, thus posing additional constraints for models of the ISM, at least in our Galactic neighbourhood.
The aim of this splinter meeting is to bring together the large ISM community, draw on its wealth of experience in all those fields by sharing experiences and ideas, and summarize our current observational and theoretical understanding of the ISM. Key topics include (but are not limited to):

  • strategies of comparing observations, measurements, and simulations; translation of observables into diagnostic parameters of the ISM, such as gas density, gas temperature, strength of the magnetic and radiation field, etc.
  • cosmic rays as the high energy component of the ISM
  • magnetic fields, interaction with plasma and particles, magnetic reconnection
  • interaction of runaway stars and high-velocity clouds with the ISM
  • energy sources and sinks, e.g. supernovae, stellar winds, radiative cooling etc.
  • structure and evolution of the local ISM as derived from dust measurements (interstellar extinction; radioisotopic anomalies on Earth and Moon) and from tracing star clusters back in time ("Galactic archeology”)
  • ISM in different Hubble type galaxies, nearby and at high redshift
  • new numerical schemes applied in state-of-the-art ISM simulations; numerical challenges encountered during code development and how these can be addressed


Wednesday September 23, 14:00-18:00 Confronting simulations of the interstellar medium with observations and measurements - Session I (virtual room F)

14:00  Opening & Welcome

14:05  Cristian Guevara:
The SOFIA legacy program FEEDBACK

14:22  Slawa Kabanovic:
SOFIA FEEDBACK [CII] observations of RCW 120: a new paradigm of HII region bubble formation

14:39  Seamus Clarke:
Dealing with large data sets: an application of automated techniques to study real and synthetic obs

14:56  Brandt Gaches:
Investigating the Accuracy of Cosmic Ray Ionization Rate Calibrations

15:13  Ralf-Jürgen Dettmar:
Observational Constraints on the CRE Transport in Galactic Halos

15:30  Discussion

15:45  Break

16:49  Eric Pellegrini:
WARPFIELD-EMP: The Self-Consistent Prediction of Emission Lines from Evolving HII Regions in Dense M

17:06  N. Schneider :
N-PDFs of molecular clouds in observations and simulations

17:23  Fabio P. Santos:
Polarization mapping of B335 and L483: magnetic fields and dust evolution from cloud to core scales

17:40  Thomas Garmatter:
IRAS 07077+1536: A dusty C-star with a peculiar SED

Thursday September 24, 09:00-13:00 Confronting simulations of the interstellar medium with observations and measurements - Session II (virtual room F)

09:00  V. Ossenkopf-Okada:
Interpreting line emission in unresolved observations

09:17  Daniel Seifried:
Synthetic dust polarisation observations of molecular clouds: What can we learn?

09:34  Stefano Ebagezio:
Tracing phases: Synthetic observations of CO, C, and C+ in molecular clouds

09:51  Marco Panessa:
Investigating HCO+ and OH in 3D-MHD simulations of molecular cloud evolution

10:08  Thomas Bisbas:
PDR diagnostics across galactic environments

10:25  Discussion

10:45  Break

11:15  Huirong Yan:
Compressible turbulence: simulations and observational detection

11:32  Hamid Hassani:
Role of Thermal and Non-thermal Processes in the ISM of Magellanic Clouds

11:49  J.-M. Teissier:
Inverse transfer of magnetic helicity in supersonic isothermal MHD turbulence

12:06  Jane Pratt:
Diffusion and dispersion in anisotropic magnetohydrodynamic turbulence

12:23  Shyam Harimohan Menon:
Compressive nature of turbulence driven by ionising radiation

12:40  Christine Koepferl:
Insights from Synthetic Star forming regions: Testing measuring techniques of SF properties

Thursday September 24, 14:00-18:00 Confronting simulations of the interstellar medium with observations and measurements - Session III (virtual room F)

14:00  Michael Schulreich:
Rayleigh-Taylor-unstable astrophysical fluid flows

14:17  Ekaterina I. Makarenko:
Emission from cooling supernova shocks in MHD simulations

14:34  D. Breitschwerdt:
Terrestrial 60Fe deposition and the implication for Near-Earth Supernovae

14:51  Victoria Herpel:
Analysis of nearby young stellar associations using Gaia DR2 for detecting past supernovae

15:08  Maurice Künicke:
Calculating stellar trajectories: A comparison between epicycles and numerical integrator in Galpy

15:25  Discussion

15:45  Break

16:15  Elena Hoemann:
Merging filaments: A race against the collapse

16:32  P.Knospe:
The blunt body problem in the context of stellar bow shocks

16:49  Wladimir E. Banda-Barragán:
Dense cloud survival in radiative multi-phase outflows

17:06  Ulrich Steinwandel:
Resolving the multiphase ISM in galaxy-scale simulations

17:23  Milena Valentini:
How stellar and AGN feedback shape the physical properties of a multiphase ISM across cosmic time

17:40  Concluding remarks

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