Conveners
Galaxies 2
- Alessandro Sonnenfeld
Using state-of-the-art reduction methods, we analyze the new JWST data acquired by the NIRISS/NIRCam wide-field slitless spectroscopy (WFSS) and NIRSpec in the multi-object slit-stepping spectroscopy mode. These complementary spectroscopic data sets obtained from multiple instruments open up key window on unbiased investigation of star formation, feedback, and ISM properties in and beyond the...
JWST observations reveal a surprising excess of luminous galaxies at z≳10, suggesting a high star formation efficiency. This contrasts with the low star formation efficiency suppressed by feedbacks at later times, indicating a potential paradigm shift. We propose that the high densities and low metallicities at high z guarantee high star-formation efficiency through feedback-free starbursts...
In this talk I will briefly discuss the present state of the field of galaxy evolution and share the results of opinion polls conducted at the 2021 European Astronomical Society meeting and the 2025 International Astronomical Union meeting. These polls illustrate the significant challenges both observers and theorists/simulators are currently facing. In sight of these apparent limitations I...
It is well known that galaxy interactions will trigger star formation, due to the tidal effect. With the observations from ALFALFA and SDSS samples, we show that galaxies with close companions tend to exihibit single-peaked integrated HI profiles, indicating that galaxy interactions lead to more centrally concentrated HI distribution, and trigger star formation.
Besides, it was found that...
Baryon-dominated dwarf galaxies (BDDGs) offer a sensitive probe of energy injection in low-mass halos. Using hydrodynamical simulations of high-velocity collisions between gas-rich ultra-diffuse galaxies, we study how progenitor structure affects BDDG formation. We model systems with varying central density profiles, corresponding to different baryonic binding energies, and introduce a gas...
