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#galaxy

53 posts38 participants8 posts today
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Daniel Fischer

RUBIES Reveals a Massive Quiescent #Galaxy at z = 7.3: iopscience.iop.org/article/10. -> Galaxies die earlier than expected: unige.ch/medias/en/2025/les-ga - an international team led by UNIGE shows that red and dead galaxies can be found only 700 million years after the Big Bang, indicating that galaxies stop forming stars earlier than predicted by models.

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Arp Bot 🤖

GALEX and SDSS image of Arp 285, also known as NGC 2854 and NGC 2856.

The left image from GALEX shows Arp 285 in ultraviolet light. The right image is from the visible light Sloan Digital Sky Survey.

The upper galaxy, NGC 2856, has a clumpy tail perpendicular to its disk, an example of a “beads on a string” feature. Gravity creates knots of star formation at regular intervals.

Credit: Fig. 12 from Smith et al. 2010.
Source: iopscience.iop.org/article/10.

A two-panel image. The left panel is labeled Arp 285 GALEX. A scale bar marks 1 arcminute, which is about 1/8 the width of the frame. The panel shows a low-res image of a pair of interacting galaxies in shades of grey. The galaxy in the top left is oval-shaped and has a line extends above the galaxy, extending perpendicular to its disk. The galaxy in the lower right has two spiral arms. It has a brighter patch off-center in the core near the lower spiral arm. A bright foreground star appears as a red dot with four diffraction spikes in the upper right. The right panel is labeled Arp 285 SDSS and has a similar 1 arcminute scale bar. It shows the same galaxies at the same scale and is higher resolution. The galaxy in the top left has a bright yellow disk seen at a slight angle so that it appears oval-shaped. It's spiral arms are fainter and hard to see detail. A thin, blue, clumpy line extends above the galaxy, perpendicular to its disk. The galaxy in the lower right has a strong bar and two spiral arms, forming a distinct S shape. The bar is brighter and yellow-ish. The arms are bluer. A bright foreground star appears as a dot in the upper right.
#ArpGalaxy#Galaxy#Space
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Arp Bot 🤖

Chandra image of Arp 220, also known as IC 4553.

The merger of two spiral galaxies set of a burst of star formation in Arp 220.

This X-ray image shows the location of the hottest gas in the galaxy merger. The central bright point contains the remnant cores of the two galaxies, which are about 1,200 light-years apart.

Credit: NASA, CXC, SAO, L. Frattare, J. Major
Source: chandra.harvard.edu/photo/2024

An abstract, blobby, purple area of hot X-ray gas. In the center is a somewhat extended bright point. Areas of fainter gas extend roughly horizontally to the left and right. Below the extended central point is a smaller bright point, likely a smaller black hole or neutron star in the galaxy, or a background supermassive black hole.
#ArpGalaxy#Galaxy#Space
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Arp Bot 🤖

Spitzer, Hubble, and Chandra image of Arp 26, also known as M101 or the Pinwheel Galaxy.

In the infrared light Spitzer view we see a network of yellow-green of dust lanes. In the visible light Hubble view, the dust is dark and blue star clusters dot the spiral arms. In the X-ray Chandra view, we see million-degree gas, supernova remnants, neutron stars, and black holes.

Credit: NASA, ESA, CXC, JPL, Caltech, STScI
Source: spitzer.caltech.edu/image/ssc2

A three-panel image, showing Spitzer, Hubble, and Chandra views of the same Spiral Galaxy M101. On the left is the Spitzer view. From a small central core, several arms spiral clockwise. They are defined by a network of yellow-green filamentary dust lanes, which look somewhat like a cross section of a nautilus. The arms are dotted with pink star-forming regions and filled in with a haze of blue stars. One spiral arm curls from about 6 o'clock to 9 o'clock and is mostly separated from the body of the galaxy. The other spiral arms are less distinct. In the middle is the Hubble view. A face-on spiral galaxy has a yellow core. Several spiral arms, dotted with blue stars and star clusters, spiral clockwise around the core. They are crossed by filamentary dust lanes. The arms are somewhat well-defined but asymmetric. One arm curls from about 6 o'clock to 9 o'clock and is mostly separated from the body of the galaxy. Another arm follows more closely to the core, from about 6 o'clock to 12 o'clock. Three other arms cover the area from 12 o'clock to 6 o'clock. On the right is the Chandra view. In this panel, blue and purple splotches partially define spiral arms. These arms are smaller and less distinct than in the other views. White dots are scattered throughout the image, including a concentration of points at the galaxy's core. Credit: NASA, ESA, CXC, JPL, Caltech, STScI. ssc2009-03b
#ArpGalaxy#Galaxy#Space
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Arp Bot 🤖

Hubble image of Arp 284, also known as NGC 7714 and NGC 7715.

In this image of NGC 7714, we see a golden loop of of Sun-like stars that has been separated from the young, blue stars in the arms and bar of the galaxy. They were pulled like taffy during a close encounter with its companion galaxy, NGC 7715 (out of frame), about 100 million to 200 million years ago.

Credit: NASA, ESA, A. Gal-Yam
Source: hubblesite.org/contents/media/

The galaxy is offset on the left side of the frame. Its center is a bright white-blue. From the center extends a wispy tan spiral arm, first going toward the top and then circling counterclockwise before dissipating just below the center of the galaxy. Two bright blue spiral arms, dotted with whiter areas of star formation, follow a similar counterclockwise path, but the blue spiral arms end in thin, dim lines that extend to the left side of the image, going off frame, and toward the right. There are tiny red background galaxies along the top third of the frame, and one prominent foreground star toward the bottom third.
#ArpGalaxy#Galaxy#Space
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