We have launched the new Spitzer website! Send feedback to outreach@ipac.caltech.edu. Find the old website at http://legacy.spitzer.caltech.edu.
Infrared View of NGC 4993, Host Galaxy to a Neutron Star Merger
Ssc2017 14a1

Credit: NASA/JPL-Caltech

Observation • October 16th, 2017 • ssc2017-14a1


NASAs Spitzer Space Telescope has provisionally detected the faint afterglow of the explosive merger of two neutron stars in the galaxy NGC 4993. The event, labeled GW170817, was initially detected nearly simultaneously in gravitational waves and gamma rays, but subsequent observations by many dozens of telescopes have monitored its afterglow across the entire spectrum of light. Spitzers observation on September 29th comes late in the game, just over 6 weeks after the event was first seen, but if this weak detection is verified, it will play an important role in helping astronomers understand how many of the heaviest elements in the periodic table are created in explosive neutron star mergers.

This image is a color composite of the 3.6 and 4.5 micron channels of the Spitzer IRAC instrument, rendered in cyan and red. The faint light from the explosion is to faint to be easily seen mixed in the light of the other stars in the galaxy.

About the Object

NGC 4993
Galaxy > Type > Lenticular
130,000,000 Light Years

Color Mapping

Band Wavelength Telescope
Infrared 3.6 µm Spitzer IRAC
Infrared 4.5 µm Spitzer IRAC


Position ()
RA =13h 9m 48.0s
Dec = -23° 22' 58.4"
Field of View
3.1 x 3.1 arcminutes
North is up