NGC 3891 is aLINER galaxy, i.e. a galaxy whose nucleus has an emission spectrum characterized by broad lines of weakly ionized atoms.[5][6] It is also aradio galaxy, i.e. it has giant regions of radio emission extending well beyond its visible structure.[7][6]
^Toba, Y.; Oyabu, S.; Matsuhara, H.; Malkan, M. A.; Gandhi, P.; Nakagawa, T.; Isobe, N.; Shirahata, M.; Oi, N.; Ohyama, Y.; Takita, S.; Yamauchi, C.; Yano, K. (2014). "Luminosity and Redshift Dependence of the Covering Factor of Active Galactic Nuclei viewed with WISE and Sloan Digital Sky Survey".The Astrophysical Journal.788 (1): 45.arXiv:1404.4937.Bibcode:2014ApJ...788...45T.doi:10.1088/0004-637X/788/1/45.
^Fossati, M.; Gavazzi, G.; Savorgnan, G.; Fumagalli, M.; Boselli, A.; Gutiérrez, L.; Hernández Toledo, H.; Giovanelli, R.; Haynes, M. P. (2013). "Hα3: An Hα imaging survey of HI selected galaxies from ALFALFA. IV. Structure of galaxies in the Local and Coma superclusters".Astronomy and Astrophysics.553: A91.arXiv:1303.0840.Bibcode:2013A&A...553A..91F.doi:10.1051/0004-6361/201220915.
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