Distant Dusty, Star-forming Galaxy
Mambo-9 was first discovered 10 years ago in the near Infra-red 0.85 nm and microwaves at 1.2 mm, then recently at 2 mm when its redshift was measured by the Atacama Large Millimeter and submillimeter Array (ALMA). . By analyzing the spectrum and image of Mambo-9, astronomers were able to deduce that it is composed of a pair of galaxies separated by 6 kpc (~20,000 ly) with the following properties.
- The two are forming starts at the rates of 590 M⊙/yr and 220 M⊙/yr,
- Total Hydrogen mass of 1.7 × 1011 M⊙
- Total dust mass of 1.3 × 109 M⊙
- Total stellar mass of 3.2 × 109 M⊙
- otal halo mass 3.3 × 1012 M⊙T
The system is undergoing a merger-driven starburst that will increase the stellar mass of the system tenfold in 40−80 Myr, converting its large molecular gas reservoir (gas fraction of ) into stars. It is predicted to have a stellar mass of more than 1015; M⊙ by the time it reaches the age of the current universe. Its age when the light we see left the galaxies was 0.97 Billion years (The universe is 13.7 billion years old at present, so the light left the galaxies 12.7 billion years ago)The ALMA image lacks details so, below, an artist gives us an idea what it might really look like if we were closer to it.
A Megaparsec (Mpc) is 3.26 million light years or 3.08 x 1019 km
A webpage to help you calculate speed, v from redshift, z