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Nordic-Baltic Astronomy Days 2026

26–29 May 2026
Radisson Blu Marina Palace Hotel
Europe/Helsinki timezone

Session

26-C2: Interstellar medium + Milky Way

Tu-08C
26 May 2026, 14:45
Room C

Room C

Description

Chair: Mika Juvela

Presentation materials

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  1. 245. The supernova efficiency to drive HI turbulence in nearby dwarf and spiral galaxies on the main sequence
    Lauri Sassali
    26/05/2026, 14:45
    Oral

    The cold gas in galaxies shows continuous turbulent motions occurring at various spatial scales that exceed those associated with thermal motions, as inferred from the observed HI velocity dispersions, implying a need for a continuous source of energy input. Supernova (SN) feedback is considered to be one of the primary candidates for this, because of its substantial energy output,...

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  2. 246. Untangling Interstellar Extinction of Galactic Cepheids
    Wilma Kiviaho (Paris Observatory)
    26/05/2026, 15:00
    Oral

    Cepheid variables serve as fundamental standard candles for calibrating the extragalactic distance scale. The high-precision parallaxes from Gaia now enable a sub-percent calibration of the Period-Luminosity (PL) relation for Milky Way (MW) Cepheids. However, interstellar extinction remains the main source of uncertainty, as the Cepheids’ variability complicates direct reddening...

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  3. 247. Local enhancement of dust grain alignment near embedded protostars
    Siddharth Kumar (Chalmers university of technology)
    26/05/2026, 15:15
    Oral

    Magnetic fields are a fundamental component of the interstellar medium (ISM), yet they cannot be observed directly and must instead be inferred through indirect tracers. Polarized thermal dust emission is a good tracer of magnetic fields in many ISM conditions, as dust grains are generally expected to be well aligned with the magnetic field. In this work, we investigate the leading theory of...

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  4. 248. Constraining the Ionization Mechanisms of Diffuse Gas in Low-SFR Galaxies
    Riku-Petteri Rautio (University of Oulu)
    26/05/2026, 15:30
    Oral

    Diffuse ionized gas (DIG) is an important component of the interstellar medium that is strongly connected to both star formation and feedback. The primary ionization mechanism of DIG is thought to be hard radiation from midplane OB stars. However, the emission spectrum of DIG shows features (such as enhanced [OIII] line emission) that models including only photoionization by midplane OB stars...

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