X-ray discovery of a dwarf-galaxy galaxy collision
Gordon P. Garmire
TL;DR
This paper reports the discovery of a dwarf galaxy collision with NGC 1232, observed solely in X-ray, revealing shocked gas and providing insights into galaxy evolution processes.
Contribution
It presents the first X-ray detection of a dwarf galaxy collision, highlighting its potential to inform galaxy evolution studies.
Findings
Detected shocked gas with 5.8 MK temperature
X-ray luminosity measured at 3.7 x10^38 erg/s
Collision region spans 7.25 kpc in diameter
Abstract
We report the discovery of a probable dwarf galaxy colliding with NGC 1232. This collision is visible only in the X-ray spectral band, and it is creating a region of shocked gas with a temperature of 5.8 MK covering an impact area 7.25 kpc in diameter. The X-ray luminosity is 3.7 x1038ergs s-1. The long lifetime of this gas against radiative and adiabatic cooling should permit the use of the luminous afterglow from such collisions to be used as a way of estimating their importance in galaxy evolution.
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