[5] The central part of NGC 4636 is circular and is surrounded by an elongated fainter envelope, containing a large number of globular clusters.

[7] The source of nuclear activity in galaxies is suggested to be a supermassive black hole that accretes material.

NGC 4636 harbors a relatively small supermassive black hole with mass 7.9×107 M☉, as inferred from the bulge velocity dispersion.

[13] Hα observations reveal the presence of warm (T ~ 104 K) ionized gas in the inner kpc of NGC 4636.

Hα maps of the galaxy core show the presence of a cavity in the distribution of the ionized gas encircled by a dense shell located at a distance of ~400 pc from the center.

Finally, NGC 4636 has an excess of cold dust, approximately cospatial with the ionized and molecular gas.

The extended dust distribution originates from the ejection of cold gas by AGN activity 10 Myr ago.

The number of globular clusters drops abruptly at 7 and 9 arcminutes, probably indicating the edge of the galaxy.

[24] Based on the hot interstellar medium temperature profile, the total mass of the halo was estimated to be 1.5×1012 M☉ within a radius of 35 kpc.

Observations by the Chandra X-ray Observatory revealed symmetric, 8 kpc long structures within the halo that look like spiral arms.

A weak radio source, elongated in the NE–SW direction, connects the NE and SW bubbles.

[27] It is possible that the bubbles have different ages, generated by different AGN outbursts, as indicated by the presence of radio-emitting plasma in one cavity, while the others are radio-quiet.

Thus, the X-ray and radio observations point to a scenario in which gas may be currently outflowing in the central kpc of NGC 4636.

[33][34] On 12 January 2020, Kōichi Itagaki discovered another type Ia supernova, designated SN 2020ue.