The influence of the environment on the morphology and star formation history of the lopsided galaxy NGC 2276

by Dr Luka Matijevic (University of Zagreb)

Tuesday 24 Mar 2026, 11:30 → 12:30 Europe/Rome

Sala Jappelli (Osservatorio astronomico di Padova)

NGC 2276 (z~0.0079), a morphologically disturbed galaxy in the NGC 2300 group, exhibits asymmetric features and an elevated star formation rate inconsistent with its stellar mass, likely influenced by its interaction with the group’s dense intergalactic medium. 
While both ram pressure stripping and tidal interactions are proposed drivers of its observed properties, their relative contributions remain unresolved. This study presents a multi-wavelength analysis of NGC 2276, combining Hubble Space Telescope (HST) observations tracing stellar population distributions with ancillary data probing ionized, molecular (sub-mm), and non-thermal (radio) gas. 
By correlating stellar demographics with gas-phase tracers, we aim to disentangle the imprints of tidal forces and ram pressure on the galaxy's stellar and interstellar components. 
Furthermore, spatially resolved star formation histories (sub-kpc scales) derived from ultraviolet-to-infrared photometric analysis are presented to reconstruct the galaxy's evolutionary timeline. 
These results are then compared to star formation histories derived from the numerical hydrodynamical simulations of a system similar to NGC 2276 to see if the observational results (e.g., total star formation, asymmetric distribution of stellar populations, etc.) can be replicated.
These results provide critical constraints on the dominant environmental mechanisms shaping NGC 2276 and offer broader insights into the role of dense environments in driving galaxy evolution in galactic groups.

 

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https://unipd.zoom.us/j/82482883288?pwd=MVvmMWSGaiVrGMyAFOdyQG61OAcI7D.1

Meeting ID: 824 8288 3288 
Passcode: 072472