Nordic-Baltic Astronomy Days 2026

Session

28-A1: Galaxies

Th-06A

28 May 2026, 13:15

Room A

Description

Chair: Johanna Hartke

312. Kinematics and Globular Clusters of the Dwarf Irregular Galaxy VCC 1249

Tuomas Hämäläinen (FINCA & University of Turku)

28/05/2026, 13:15

Oral

VCC 1249 is dwarf irregular galaxy located within the halo of Messier 49 (M49), the brightest galaxy in the Virgo galaxy cluster. The gravitational interaction between the two galaxies leads to accretion of matter, including globular clusters, from VCC 1249 into the intracluster light of the Virgo cluster and the halo of M49. Understanding galactic interactions like these can improve our...

313. JWST/NIRCam Close-Up of the Gravitational Dance Between Two Dwarf Galaxies

Giacomo Bortolini (Stockholm University)

28/05/2026, 13:30

Oral

I will present new JWST/NIRCam observations of the interacting dwarf galaxies NGC 4485/NGC 4490 (a.k.a. Arp 269), obtained as part of the Cycle 1 Feedback in Emerging extrAgalactic Star clusTers (FEAST) program. NGC 4485 and NGC 4490 form the closest known pair of interacting late-type dwarf galaxies (at ~8 Mpc), excluding the Magellanic Clouds. This system offers a unique opportunity to study...

314. The Diffuse Neutral Circum-Galactic Medium around High-z Dusty Galaxies

Kirsty Butler (Chalmers University of Technology)

28/05/2026, 13:45

Oral

Galaxies do not form in isolation, but rather evolve symbiotically with the wider cosmic web. At the interface between a galaxy's Interstellar Medium (ISM) and the Inter-Galactic Medium (IGM) is the Circum-Galactic Medium (CGM) in which all matter flowing in from the IGM or out of the galaxy must travel. This halo of gas is therefore sensitive to both the evolutionary processes occurring...

315. Could the alpha-bimodality observed in the Milky Way be a natural consequence of inside-out disc growth driven by hierarchical accretion?

María Benito Castaño

28/05/2026, 14:00

Oral

In this talk, we will assess what can drive a chemical bimodality in the [α/Fe]-[Fe/H] plane of disc stars in a simulated Milky Way-mass galaxy which has had no major mergers and negligible radial migration. We will first identify disc components via Gaussian Mixture Modeling and then interpret them based on chemical evolutionary tracks, gas flows across the disc and their interaction with the...

316. A MUSE Investigation into the Birth and Death of Massive Stars in (Ultra-) Luminous Infrared Galaxies ((U)LIRGs)

Suman Sahu (University of Turku)

28/05/2026, 14:15

Oral

(Ultra-) Luminous Infrared Galaxies ((U)LIRGs) host some of the most intense star formation in the local universe and serve as nearby analogues of high-redshift starbursts. High–resolution near-infrared adaptive optics imaging of nearby (U)LIRGs reveals two key results: a substantial fraction of core-collapse supernovae (CCSNe- the death of massive stars) occur in faint, apparently isolated...