https://www.aanda.org/articles/aa/full_html/2020/02/aa36796-19/aa36796-19.html
LOFAR view of NGC 3998, a sputtering AGN | Astronomy & Astrophysics (A&A)
ngc 3998lofarviewsputteringagn
https://www.astronomy.com/science/spiral-galaxy-m61-the-silver-needle-galaxy-ngc-4244-and-spiral-galaxy-ngc-3998/
Spiral galaxy M61, the Silver Needle Galaxy (NGC 4244), and spiral galaxy NGC 3998 | Astronomy.com
May 18, 2023 - In this week's Astronomy magazine podcast, we'll help you observe the spiral galaxies M61, NGC 3998, and the Silver Needle Galaxy (NGC 4244) in your March...
spiral galaxy m61silver needle