The spiral galaxy D100, on the far right of this Hubble Space Telescope image, is being stripped of its gas as it plunges toward the center of the giant Coma galaxy cluster.
The dark brown streaks near D100's central region are silhouettes of dust escaping from the galaxy. The dust is part of a long, thin tail, also composed of hydrogen gas, that stretches like taffy from the galaxy's core. Hubble, however, sees only the dust. The telescope's sharp vision also uncovered the blue glow of clumps of young stars in the tail. The brightest clump in the middle of the tail (the blue feature) contains at least 200,000 stars, fueled by the ongoing loss of hydrogen gas from D100.
The gas-loss process occurs when D100, due to the pull of gravity, begins falling toward the dense center of the massive Coma cluster, consisting of thousands of galaxies. During its plunge, D100 plows through intergalactic material like a boat plowing through water. This material pushes gas and dust out of the galaxy. Once D100 loses all of its hydrogen gas, its star-making fuel, it can no longer create new stars. The gas-stripping process in the beleaguered galaxy began roughly 300 million years ago.
The reddish galaxies in the image contain older stars between the ages of 500 million to 13 billion years old. One of those galaxies is D99, just below and to the left of D100. It was stripped of its gas by the same process as the one that is siphoning gas from D100. The blue galaxies contain a mixture of young and old stars. Some of the stars are less than 500 million years old. The Coma cluster is located 330 million light-years from Earth.
The Hubble image is a blend of several exposures taken in visible light between May 10 and July 10, 2016, and November 2017 to January 2018, by the Advanced Camera for Surveys.
Credits
NASA, ESA, M. Sun (University of Alabama), and W. Cramer and J. Kenney (Yale University)| About The Object | |
|---|---|
| Object Name | D100 |
| Object Description | Ram pressure stripped galaxy |
| R.A. Position | 13:00:09.127 |
| Dec. Position | +27:52:02.998 |
| Constellation | Coma Berenices |
| Distance | 330 million light-years |
| Dimensions | Main image is 45 arcsec across (about 72,000 light-years); Secondary image is 1.8 arcmin across (about 173,000 light-years) |
| About The Data | |
| Data Description | The HST observations include those from program (M. Sun) |
| Instrument | ACS/WFC |
| Exposure Dates | 10 May 2016 to 10 July 2016, and November 2017 to January 2018 |
| Filters | F475W, F814W |
| About The Image | |
| Color Info | These images are a composite of separate exposures acquired by the — instrument on the Hubble Space Telescope. Several filters were used to sample narrow wavelength ranges. The color results from assigning different hues (colors) to each monochromatic (grayscale) image associated with an individual filter. In this case, the assigned colors are: Blue: F475W Red: F814W |
| Compass Image |  |
| About The Object | |
|---|---|
| Object Name | A name or catalog number that astronomers use to identify an astronomical object. |
| Object Description | The type of astronomical object. |
| R.A. Position | Right ascension – analogous to longitude – is one component of an object's position. |
| Dec. Position | Declination – analogous to latitude – is one component of an object's position. |
| Constellation | One of 88 recognized regions of the celestial sphere in which the object appears. |
| Distance | The physical distance from Earth to the astronomical object. Distances within our solar system are usually measured in Astronomical Units (AU). Distances between stars are usually measured in light-years. Interstellar distances can also be measured in parsecs. |
| Dimensions | The physical size of the object or the apparent angle it subtends on the sky. |
| About The Data | |
| Data Description |
|
| Instrument | The science instrument used to produce the data. |
| Exposure Dates | The date(s) that the telescope made its observations and the total exposure time. |
| Filters | The camera filters that were used in the science observations. |
| About The Image | |
| Image Credit | The primary individuals and institutions responsible for the content. |
| Publication Date | The date and time the release content became public. |
| Color Info | A brief description of the methods used to convert telescope data into the color image being presented. |
| Orientation | The rotation of the image on the sky with respect to the north pole of the celestial sphere. |
