Acquisitions and Mergers


This video starts with data from a survey of galaxies (blue and green) done by ESA’s Herschel Space Observatory and zooms in on a source that astronomers found interesting. The zooming in continues using observations performed with the Atacama Pathfinder Experiment (APEX; red). Finally, the video shows further observations obtained with the Atacama Large Millimeter/submillimeter Array (ALMA) at higher resolution. Those observations revealed that the interesting source isn’t an ancient, massive galaxy, but of a pair of distinct massive galaxies about to merge. These two galaxies, each roughly as massive as our Milky Way, were informally dubbed the ‘Horse’ and the ‘Dragon’.

Video Credit: ESA

Herschel’s View of the Eagle Nebula


Herschel_Eagle_Nebulapillars6_hst_960The famous Hubble Space Telescope image of the Pillars of Creation,the light-years long star forming columns of cold gas and dust inside the Eagle Nebula is inset on the left. This false-color composite image above shows the nearby stellar nursery using data from the Herschel Space Observatory. Herschel‘s far infrared detectors record the emission from the region’s cold dust directly. The famous pillars are included near the center of the scene.

Image Credit: ESA

International Crab


International CrabThe Crab nebula is the remnant of a supernova explosion recorded by Chinese astronomers in the year 1054. This is composite view of the Crab nebula was assembled using data from the Herschel Space Observatory and the Hubble Space Telescope. Herschel is a European Space Agency (ESA) mission with important NASA contributions, and Hubble is a NASA mission with important ESA contributions.

Hubble‘s view of the nebula at visible wavelengths used three different filters sensitive to the emission from oxygen and sulphur ions and is shown here in blue. Herschel’s far-infrared image reveals the emission from dust in the nebula and is shown here in red.

Image Credit: ESA/NASA

A Not-So-Empty Hole


Lockman's HoleThere’s an area in the night sky called the “Lockman Hole.” It’s found in the constellation of Ursa Major (The Big Bear; the Big Dipper forms the lower body and tail of the larger constellation.) This “hole” appears almost empty to the naked eye and small telescopes. Regions like this one are almost completely devoid of objects in our Milky Way galaxy. With little local clutter in the way the Lockman ideal for studying galaxies in the distant universe.

Here’s what this empty part of the sky looked like when it was surveyed in infrared light by the Herschel Space Observatory. All of the little dots in this picture are distant galaxies. Their collective light is known as the cosmic infrared background. By studying this pattern, astronomers were able to measure various effects of dark matter.

Image credit: ESA

Betelgeuse


betelgeuse_bow_shockThe supergiant star Betelgeuse, the bright red star in Orion’s shoulder, is surrounded by an envelope of nearby material which is probably matter that it shed as it evolved into a supergiant. The arcs to the left in this image taken by the Herschel Space Observatory are material ejected from the star as it evolved into a red supergiant, and are shaped by its bow shock interaction as it move through the interstellar medium. The faint linear bar of dust on the left may represent a dusty filament connected to the local galactic magnetic field or the edge of an interstellar cloud. If so, then Betelgeuse’s motion across the sky implies that the arcs will hit the wall in 5,000 years time, and the star itself will smack into the wall 12,500 years later.

Image Credit: ESA

A Dwarf Galaxy


This infrared light picture of the Small Magellanic Cloud galaxy was assembled using data from the Herschel Space Observatory, a European Space Agency-led mission, and NASA’s Spitzer Space Telescope. The Large and Small Magellanic Clouds are the two biggest satellite galaxies of our home galaxy. They are considered dwarf galaxies compared to the big spiral of the Milky Way.

By combining data from Herschel and Spitzer, the irregular distribution of dust in the Small Magellanic Cloud becomes clear. A stream of dust called the galaxy’s “wing” extends to the left in the picture, and a vertical line of star formation is on the right.

The colors in this image indicate temperatures in the dust in the Cloud. Regions where star formation is at its earliest stages or is shut off are cooler. Warm spot occur around new stars heating surrounding dust. The coldest areas and objects are red, corresponding to infrared light taken up by Herschel’s at 250 microns (A micron is 0.000001 m). Herschel 100 and 160 micron data shown in green indicates warmer areas.1 The warmest spots appear in blue and are derived from 24 and 70 micron data from Spitzer.

Image Credit: ESA/NASA/JPL