NGC 4457 may have had a recent minor merger with another galaxy.[12]
On July 1 2020, an astronomical transient was discovered in NGC 4457 by astronomer Kiochi Itagaki and confirmed by
ASAS-SN. Spectroscopic classification determined the object to be a
Type Ia Supernova, SN 2020nvb.[13]
Physical characteristics
NGC 4457 has a broad oval zone containing an inner spiral which is defined mainly by two fairly open arms. There is a well-defined outer ring that is completely detached from the inner regions of the galaxy.[14]
Truncated disk
NGC 4457 has a severely reduced amount of
star-formation in its disk while its inner regions have a normalized rate of massive star formation.[14] This may have been caused by a recent interaction of the
gas in the galaxy with the
gas in the surrounding
Virgo Cluster,[15] causing the gas to be stripped away in an effect known as
ram-pressure stripping.[16]
^TERASHIMA, YUICHI; HO, LUIS C.; PTAK, ANDREW F.; MUSHOTZKY, RICHARD F.; SERLEMITSOS, PETER J.; YAQOOB, TAHIR; KUNIEDA, HIDEYO (20 April 2000). "ASCA Observations of "Type 2" LINERs: Evidence for a Stellar Source of Ionization". The Astrophysical Journal. 533 (2): 729–743.
arXiv:astro-ph/9911340.
Bibcode:
2000ApJ...533..729T.
doi:
10.1086/308690.
S2CID14130773.
^Vollmer, B.; Soida, M.; Beck, R.; Chung, A.; Urbanik, M.; Chyzy, K.T.; Otmianowska-Mazur, K.; Kenney, J.D.P. (4 April 2013). "Large-scale radio continuum properties of 19 Virgo cluster galaxies⋆ The influence of tidal interactions, ram pressure stripping, and accreting gas envelopes". Astronomy & Astrophysics. 553: 38.
arXiv:1304.1279.
Bibcode:
2013A&A...553A.116V.
doi:
10.1051/0004-6361/201321163.
S2CID119190841.
^Binggeli, B.; Sandage, A.; Tammann, G. A. (September 1985). "Studies of the Virgo Cluster. II - A catalog of 2096 galaxies in the Virgo Cluster area. V - Luminosity functions of Virgo Cluster galaxies". The Astronomical Journal. 90: 1681.
Bibcode:
1985AJ.....90.1681B.
doi:
10.1086/113874.
ISSN0004-6256.