Below is a list of my approved proposals. Click on a title to view the abstract.
2026
Role: PI · Telescope: FAST · Semester: 2025 · Time: 12 hours
Abstract: Building a complete picture of baryon cycle in dwarf galaxies is essential for
understanding the evolution of the first galaxies in the universe. Dwarf galaxies lost
most of baryons from the stellar disk. Previous UV observations have revealed that
most baryons are expelled to larger radii even beyond virial radius through feedback.
In addition to the possible outflow driven by feedback in Sextans A, NGC 4214
exhibits an inflow of MgII-enriched gas with a velocity of 27 km/s. However, previous
observations via VLA or SKA-KAT7 failed to detect either outflow or inflow of HI gas,
likely due to the limited sensitivity. In addition to the distribution of cold gas, it
remains uncertain how much cold gas is bound in dwarf galaxies. We propose to
observe diffuse HI gas of two typical dwarf galaxies to investigate cold gas component
of dwarf galaxies. The high sensitivity of FAST enables us to detect HI gas with column
density down to 10^17 cm^-2. This observation can help us understand: (1). What is
the spatial distribution and dynamic of HI gas in dwarf galaxies? (2). How much cold
gas can dwarf galaxies bound?
Abstract: We propose to observe the Hβ, OIII, and Hα emissions from an interacting system composed by a red spiral, a green valley galaxy,
and a blue dwarf, using the Palomar Cosmic Web Imager (PCWI). Red spirals exhibit distinct properties compared to blue spirals,
including massive halos and unique star formation histories. While previous studies have primarily focused on isolated red spirals, the
role of red spirals in interacting systems remains poorly understood. Is the hot halo of a red spiral as efficient as that of an elliptical
galaxy in quenching star formation in its companion ? Is the companion galaxy evolving into a new red spiral during current interacting ?
An IFU observation can help us investigate the impact of red spirals in interacting systems. This study will also advance our
understanding of how red spirals influence their environments and contribute to galaxy evolution.