A Molecular Gas Bridge between the Taffy Galaxies

Details A Molecular Gas Bridge between the Taffy Galaxies A Molecular Gas Bridge between the Taffy Galaxies

2003-08-27

arxiv.org/abs/astro-ph/0308476v1

Astron.Astrophys.408:L13-L16,2003

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures Astronomy and Astrophysics in press (Sept.)

Scientific paper

10.1051/0004-6361:20031148

The Taffy Galaxies system, UGC 12914/5, contains huge amounts of molecular gas in the bridge region between the receding spirals after a direct collision. $2 - 9 \times 10^9$M$_\odot$ of molecular gas is present between the galaxies, more than the CO emission from the entire Milky Way! Such dense gas can only be torn off by collisions between dense clouds, in this case with relative velocities of about 800 $\kms$, such that the remnant cloud acquires an intermediate velocity and is left in the bridge after separation of the colliding galaxies. We suggest that after ionization in the collision front, the gas cooled and recombined very quickly such that the density remained high and the gas left the colliding disks in molecular form.

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