Pic of the Week: Collision in the Coma Galaxy Cluster

Posted on by onespaceman2000
Image (Credit): Interacting spiral galaxies called MCG+05-31-045 as captured by the Hubble Space Telescope. (ESA/Hubble & NASA, R. J. Foley (UC Santa Cruz))

This week’ image was captured by the Hubble Space Telescope. It captures the interplay between two galaxies in what is called MCG+05-31-045 that is part of the Coma galaxy cluster. These two galaxies are about 390 million light-years away.

Here is more on the image from NASA:

The Coma Cluster is a particularly rich cluster that contains over a thousand known galaxies. Amateur astronomers can easily spot several of these in a backyard telescope (See Caldwell 35). Most of them are elliptical galaxies, and that’s typical of a dense galaxy cluster like the Coma Cluster: many elliptical galaxies form through close encounters between galaxies that stir them up, or even collisions that rip them apart. While the stars in interacting galaxies can stay together, their gas is twisted and compressed by gravitational forces and rapidly used up to form new stars. When the hot, massive, blue stars die, there is little gas left to form new generations of young stars to replace them. As spiral galaxies interact, gravity disrupts the regular orbits that produce their striking spiral arms. Whether through mergers or simple near misses, the result is a galaxy almost devoid of gas, with aging stars orbiting in uncoordinated circles: an elliptical galaxy.

It’s very likely that a similar fate will befall MCG+05-31-045. As the smaller spiral galaxy is torn up and integrated into the larger galaxy, many new stars will form, and the hot, blue ones will quickly burn out, leaving cooler, redder stars behind in an elliptical galaxy, much like others in the Coma Cluster. But this process won’t be complete for many millions of years.

Pic of the Week: The Red Monsters

Posted on by onespaceman2000
Image (Credit): The “Red Monsters” as captured by the JWST. (NASA/CSA/ESA, M. Xiao & P. A. Oesch (University of Geneva), G. Brammer (Niels Bohr Institute), Dawn JWST Archive)

This week’s image from the James Webb Space Telescope (JWST) was highlighted by researchers at the University of Bath. It represents three ultra-massive galaxies about the size of our Milky Way from the first billion years of the universe following the Big Bang.

The researchers discuss this in their paper in Nature, Accelerated Formation of Ultra-massive Galaxies in the First Billion Years. The abstract is a bit too technical, but suffice it to say that this is a significant discovery.

As noted in Tech Exporist, Dr. Mengyuan Xiao, lead author of the new study and postdoctoral researcher in the Department of Astronomy at UNIGE Faculty of Science, stated:

These results indicate that galaxies in the early Universe could form stars with unexpected efficiency. As we study these galaxies in more depth, they will offer new insights into the conditions that shaped the Universe’s earliest epochs. The ‘Red Monsters’ are just the beginning of a new era in our exploration of the early Universe.

Pic of the Week: CRS-31 Capsule Approaches the ISS

Posted on by onespaceman2000
Image (Credit): The Dragon capsule approaching the ISS earlier this week with Argentina in the background. (NASA)

This week’s image from NASA shows the uncrewed Dragon capsule approaching the International Space Station (ISS) on Tuesday, November 5th. Once connected with the station, the crew removed the cargo that included new scientific gear. You can read more about the ongoing operations on the ISS here.

Pic of the Week: Galaxies Passing in the Night

Posted on by onespaceman2000
Image (Credit): Galaxies IC 2163 and NGC 2207. (NASA, ESA, CSA, STScI)

This week’s image showing two galaxies – IC 2163 and NGC 2207 – comes from both the Hubble Space Telescope and the James Webb Space Telescope.

Here is more about the image from Hubblesite.org:

The gruesome palette of these galaxies is owed to a mix of mid-infrared light from NASA’s James Webb Space Telescope, and visible and ultraviolet light from NASA’s Hubble Space Telescope. The pair grazed one another millions of years ago. The smaller spiral on the left, cataloged as IC 2163, passed behind NGC 2207, the larger spiral galaxy at right.

Both have increased star formation rates. Combined, they are estimated to form the equivalent of two dozen new stars that are the size of the Sun annually. Our Milky Way galaxy forms the equivalent of two or three new Sun-like stars per year.

Both galaxies have hosted seven known supernovae, each of which may have cleared space in their arms, rearranging gas and dust that later cooled, and allowed new many stars to form. (Find these areas by looking for the bluest regions).

Pic of the Week: The Dance of R Aquarii

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Image (Credit): The R Aquarii binary star system. (NASA, ESA, Matthias Stute , Margarita Karovska , Davide De Martin (ESA/Hubble), Mahdi Zamani (ESA/Hubble))

This week’s image is from the Hubble Space Telescope. It shows a brilliant pattern in the sky about 700 light-years away. It is the product of an odd dance between two symbiotic stars, one red and the other white.

Here is more information about the image from the Hubblesite:

Located approximately 700 light-years away, a binary star system called R Aquarii undergoes violent eruptions that blast out huge filaments of glowing gas. The twisted stellar outflows make the region look like a lawn sprinkler gone berserk. This dramatically demonstrates how the universe redistributes the products of nuclear energy that form deep inside stars and jet back into space.

R Aquarii belongs to a class of double stars called symbiotic stars. The primary star is an aging red giant and its companion is a compact burned-out star known as a white dwarf. The red giant primary star is classified as a Mira variable that is over 400 times larger than our Sun. The bloated monster star pulsates, changes temperature, and varies in brightness by a factor of 750 times over a roughly 390-day period. At its peak the star is blinding at nearly 5,000 times our Sun’s brightness.

When the white dwarf star swings closest to the red giant along its 44-year orbital period, it gravitationally siphons off hydrogen gas. This material accumulates on the dwarf star’s surface until it undergoes spontaneous nuclear fusion, making that surface explode like a gigantic hydrogen bomb. After the outburst, the fueling cycle begins again.

This outburst ejects geyser-like filaments shooting out from the core, forming weird loops and trails as the plasma emerges in streamers. The plasma is twisted by the force of the explosion and channeled upwards and outwards by strong magnetic fields. The outflow appears to bend back on itself into a spiral pattern. The plasma is shooting into space over 1 million miles per hour – fast enough to travel from Earth to the Moon in 15 minutes! The filaments are glowing in visible light because they are energized by blistering radiation from the stellar duo.