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Cosmology

The host galaxy (NGC 4993) of SSS17a, the first electromagnetic counterpart to a gravitational wave source
Image Credit: Pan et al.
The host galaxy (NGC 4993) of SSS17a, the first electromagnetic counterpart to a gravitational wave source
The image shows the host galaxy (NGC 4993) of SSS17a, the first electromagnetic counterpart to a gravitational wave source, in different scales (Pan et al. 2017).
Upper left: False-color (RGB channels corresponding to PS1 irg filters) image of the field surrounding NGC 4993 (indicated by the yellow arrow). The green arrow marks the closest galaxy to NGC 4993 in the same galaxy group, ESO 508-G018. Upper right: Zoom-in of the upper-left image centered on NGC 4993. The red cross marks the location of SSS17a. Lower left: HST/ACS F606W image near the center of NGC 4993. The yellow circle represents the 1-σ error circle of the SSS17a location. The dust lanes surrounding the galactic center are obvious. Lower right: Zoom-in of the lower-left image after subtracting a galfit model, centered on the SSS17a location. The yellow circle and red circle represent the 1-σ and 3-σ astrometric uncertainty, respectively. Blue circles mark the potential globular clusters near the transient location. For all images, north is up and east is left.
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