Featured in this new image from the NASA/ESA Hubble Space Telescope is a nearly edge-on view of the lenticular galaxy NGC 4753. Lenticular galaxies have an elliptical shape and ill-defined spiral arms.
19.05.2024
This NASA Hubble Space Telescope image captures a triple-star star system.
NASA, ESA, G. Duchene (Universite de Grenoble I); Image Processing: Gladys Kober (NASA/Catholic University of America)
Looking like a glittering cosmic geode, a trio of dazzling stars blaze from the hollowed-out cavity of a reflection nebula in this new image from NASA’s Hubble Space Telescope. The triple-star system is made up of the variable star HP Tau, HP Tau G2, and HP Tau G3. HP Tau is known as a T Tauri star, a type of young variable star that hasn’t begun nuclear fusion yet but is beginning to evolve into a hydrogen-fueled star similar to our Sun. T Tauri stars tend to be younger than 10 million years old ― in comparison, our Sun is around 4.6 billion years old ― and are often found still swaddled in the clouds of dust and gas from which they formed.
Quelle: NASA
+++
Hubble Views Cosmic Dust Lanes
This Hubble Space Telescope image showcases a nearly edge-on view of the lenticular galaxy NGC 4753.
ESA/Hubble & NASA, L. Kelsey
This image is the object's sharpest view to date, showcasing Hubble’s incredible resolving power and ability to reveal complex dust structures. NGC 4753 resides around 60 million light-years from Earth in the constellation Virgo and was first discovered by the astronomer William Herschel in 1784. It is a member of the NGC 4753 Group of galaxies within the Virgo II Cloud, which comprises roughly 100 galaxies and galaxy clusters.
This galaxy is likely the result of a galactic merger with a nearby dwarf galaxy roughly 1.3 billion years ago. NGC 4753’s distinct dust lanes around its nucleus probably accreted from this merger event.
Astronomers think that most of the mass in the galaxy lies in a slightly flattened, spherical halo of dark matter. Dark matter is called ‘dark’ because we cannot directly observe it, but astronomers think it comprises about 85% of all matter in the universe. Dark matter doesn’t appear to interact with the electromagnetic field, and therefore does not seem to emit, reflect, or refract light. We can only detect it by its gravitational influence on the matter we can see, called normal matter.
NGC 4753’s low-density environment and complex structure make it scientifically interesting to astronomers who can use the galaxy in models that test different theories of formation of lenticular galaxies. The galaxy has also hosted two known Type Ia supernovae. These types of supernovae are extremely important in the study of the expansion rate of the universe. Because they are the result of exploding white dwarfs which have companion stars, they always peak at the same brightness -- 5 billion times brighter than the Sun. Knowing the intrinsic brightness of these events and comparing that with their apparent brightness allows astronomers to use them to measure cosmic distances, which in turn help us determine how the universe has expanded over time.
Quelle: NASA/ESA
200 Views