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Using deep, narrowband imaging of the nearby peculiar spiral galaxy NGC 5474, we present stellar age information across its disk and …

NGC 4258 is a prime target for studying feedback in Low-Luminosity Active Galactic Nuclei (LLAGNs) due to its proximity and …

High-redshift observations from JWST indicate that optical strong line ratios do not carry the same constraining power as they do at …

As part of the SIGNALS survey, which comprises a sample of approximately 40 nearby galaxies observed with the Fourier transform …

A satellite galaxy of the nearby spiral M101, NGC 5474 has a prominent bulge offset from the kinematic center of the underlying …

The variations of oxygen abundance and ionization parameter in HII regions are usually thought to be the dominant factors that produced …

We examine the connection between diffuse ionized gas (DIG), H II regions, and field O and B stars in the nearby spiral M101 and its …

Using deep, narrowband imaging of the nearby spiral galaxy M101, we present stellar age information across the full extent of the disk …

We present the spectra of two faint star-forming objects originally identified in our deep narrowband survey of the M101 Group. One is …

We present deep, narrowband imaging of the nearby spiral galaxy M101 and its satellite to analyze the oxygen abundances of their HII regions. We add to the narrowband data set of the M101 Group, consisting of Hα, Hβ, and [OIII] emission lines, the blue [OII]λ3727 emission line for the first time. Using the $R_{23}$ strong-line ratio, we estimate the oxygen abundances of ~720 HII regions throughout the M101 Group. M101 shows a strong abundance gradient, while the satellite galaxies present little or no gradient. There is some evidence for a flattening of the gradient in M101 beyond R ~ 14 kpc. Additionally, M101 shows signs of azimuthal abundance variations to the west and southwest. These features are explored in the context of the M101-NGC 5474 interaction.