NGC 1369
A barred lenticular galaxy in the Fornax Cluster.
NGC 1369 is a barred lenticular galaxy about 59 million light-years away in the constellation Eridanus. It belongs to the Fornax Cluster and was first observed by astronomer Julius Schmidt on January 19, 1865. At its center sits a supermassive black hole with a mass roughly 1.8 million times that of the Sun, and the galaxy is surrounded by at least 11 known globular clusters.
The galaxy’s disk features two bright, diffuse spiral arms that emerge from a relatively weak bar structure. These arms quickly fade into the outer disk. Despite having spiral arms, NGC 1369 appears very red, which classifies it as a lenticular galaxy. It contains no atomic or molecular gas and shows no signs of ionized-gas emission from star formation. X-ray observations indicate the galaxy is falling into a transitional region of the Fornax Cluster, where X-ray emission still exists between high- and low-density areas. This suggests that ram-pressure stripping halted star formation once the galaxy entered the cluster core, transforming it from a spiral into a lenticular galaxy.
One supernova has been observed in NGC 1369: SN 1969A, discovered by Enrique Chavira on January 8, 1969. Its type is unknown, and it reached a magnitude of 17.
Quick Facts
- Epoch
- J2000
- Ra
- 03 · 36 · 45.2737
- Dec
- -36 · 15 · 22.660
- Dist Ly
- 19.69 ± 1.38 Mpc
- H Radial V
- 1428 km/s
- Z
- 0.004763
- Appmag V
- 13.74
- Constellation Name
- Eridanus (constellation)
- Mass
- 0.6810 (Stellar mass) · 3.510 (Total Mass)
- Group Cluster
- Fornax Cluster
Facts from the source article.
Lore & Background
NGC 1369 was discovered by astronomer Julius Schmidt on January 19, 1865. The galaxy exhibits two bright, diffuse spiral arms that break off from a relatively weak bar structure, but these arms quickly fade into the diffuse outer disk. Despite the presence of spiral arms, the galaxy is very red, which classifies it as a lenticular galaxy. NGC 1369 is devoid of atomic and molecular gas and shows no indications of ionized-gas emission from star formation. X-ray observations indicate that the galaxy is infalling in a transitional region of the Fornax Cluster, between high- and low-density regions where X-ray emission is still present. Ram-pressure stripping is thought to have halted star formation once the galaxy entered the cluster core, causing its transition from a spiral to a lenticular galaxy.
Reader's Guide
NGC 1369's significance lies in its role as an example of galaxy transformation within a dense cluster environment. The galaxy's red color, lack of gas, and absence of star formation, combined with its infall into the Fornax Cluster, illustrate the process of ram-pressure stripping that can convert a spiral galaxy into a lenticular one. The presence of a supermassive black hole and a population of globular clusters adds to its astrophysical interest. The single observed supernova, SN 1969A, discovered by Enrique Chavira on January 8, 1969, provides a rare historical event within this galaxy. NGC 1369 thus serves as a case study for understanding how cluster membership and environmental effects shape galactic evolution.
Did You Know?
- NGC 1369 hosts a supermassive black hole with an estimated mass of 1.8 million solar masses.
- The galaxy has at least 11 known globular clusters surrounding it.
- One supernova, SN 1969A, was observed in NGC 1369 on January 8, 1969.
More in Galaxy Clusters and Groups, Part 4 1-24
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