Omega_Centauri_2023_02_18_1__Annotated
Image was annotated in PixInsight. See original image for capture and other processing details.
Two rather prominent galaxies can be seen in this image. PGC47003 to the right of Omega Centauri and PGC47340 to the lower left. Their distance from us is 140 Mly and 150 Mly respectively. There are several smaller PGC objects that have been annotated in the frame.
Notice that the galaxies in this image have a reddish cast. This is likely the result of the scene's low galactic lattitude (about 15 degrees from the center of the galactic plane), which means that their light has traveled through larger cross section of Milky Way dust to reach us than it would have if the objects were directly above or below the galactic plane.
We see more red light from these normally white objects, because light at the red end of the visible spectrum penetrates the dust more readily that the blue light. This work in much the same way that sunrises and sunsets are red due to light travelling through a thicker cross section of the Earth's atmosphere than if the Sun were closer to the zenith.
Omega_Centauri_2023_02_18_1__Annotated
Image was annotated in PixInsight. See original image for capture and other processing details.
Two rather prominent galaxies can be seen in this image. PGC47003 to the right of Omega Centauri and PGC47340 to the lower left. Their distance from us is 140 Mly and 150 Mly respectively. There are several smaller PGC objects that have been annotated in the frame.
Notice that the galaxies in this image have a reddish cast. This is likely the result of the scene's low galactic lattitude (about 15 degrees from the center of the galactic plane), which means that their light has traveled through larger cross section of Milky Way dust to reach us than it would have if the objects were directly above or below the galactic plane.
We see more red light from these normally white objects, because light at the red end of the visible spectrum penetrates the dust more readily that the blue light. This work in much the same way that sunrises and sunsets are red due to light travelling through a thicker cross section of the Earth's atmosphere than if the Sun were closer to the zenith.