M61 is one of the largest members of Virgo Cluster, and belongs to a smaller subgroup known as the S Cloud.[7][8] The morphological classification of SAB(rs)bc[3] indicates a weakly-barred spiral (SAB) with the suggestion of a ring structure (rs) and moderate to loosely wound spiral arms.[9] It has an active galactic nucleus[10] and is classified as a starburst galaxy containing a massivenuclear star cluster with an estimated mass of 105solar masses and an age of 4 million years,[11] as well as a central candidate supermassive black hole weighing around 5×106M☉ solar masses.[12]
It cohabits with an older massive star cluster as well as a likely older starburst.[11] Evidence of significant star formation and active bright nebulae appears across M61's disk.[13] Unlike most late-type spiral galaxies within the Virgo Cluster, M61 shows an unusual abundance of neutral hydrogen (H I).[14]
Extragalactic supernovae
Eight extragalactic supernovae have so far been observed in M61, making it one of the most prodigious galaxies for such cataclysmic events.[15][16][5] These include: SN 1926A (type II-K, mag. 14),[16] SN 1961I (Type II, mag. 13),[16] SN 1964F (Type II, mag. 14),[17] SN 1999gn (Type II, mag. 16),[18] SN 2006ov (Type II, mag. 14.9),[19] SN 2008in (Type II, mag. 14.9),[20] SN 2014dt (type Ia-pec, mag. 13.6),[21] and SN 2020jfo (Type II, mag. 16).[22][23]
Gallery
Spiral galaxy Messier 61 is aligned face-on towards Earth.[24]
Messier 61 image using data from Hubble's Wide Field Camera 2
Amateur Image of Messier 61 Showing Supernova 2008in on April 16, 2009
Infrared image of M61 taken by the Spitzer Space Telescope
Messier 61 with SN2020jfo (Supernova) observed on May 15, 2020
M61 galaxy image that incorporates data from not only Hubble, but also the FORS camera at the European Southern Observatory’s Very Large Telescope