Tag Archive for 'Dwarf galaxy'

The left panel shows a three-color composite mosaic of NGC 346 combining Webb’s F277W (blue), F335M (green) and F444W (red) filters. The region is rich in structures of knots, arcs and filaments. Areas of bright pink and/or red emission are associated with clumpy star formation. The spatially resolved PAH emission excited by ultraviolet photons in green is brightest in regions corresponding to the edges of dense material, characteristic of a photodissociation region. Massive stars, stars belonging to the BS90 cluster (circled in green) and the Small Magellanic Cloud field population are also visible. The right panel shows a mosaic image from the F335M filter showing four different populations of stars: pre-main-sequence stars (blue circles), young stellar objects with Paα (orange diamonds), young stellar objects without Paα (red squares) and stars matched with the HST-PMS catalogue (purple stars). Image credit: Jones et al., doi: 10.1038/s41550-023-01945-7.

Webb Detects Planetary Ingredients in NGC 346

Apr 25, 2023 by Natali Anderson

Located in the Small Magellanic Cloud at a distance of roughly 200,000 light-years, NGC 346 is a prominent young cluster — roughly 3 million years...

Color-composite image of the galaxy cluster RX J2129.6+0005; green circles indicate three lensed images of the dwarf starburst galaxy RX J2129-z95. Image credit: Williams et al., doi: 10.1126/science.adf5307.

Webb Finds Tiny Star-Forming Galaxy in Early Universe

Apr 13, 2023 by Enrico de Lazaro

The newly-discovered galaxy, named RX J2129-z95, appears as three images due to the gravitational lensing of the foreground galaxy cluster RX J2129.6+0005....

An artist’s impression of a runaway supermassive black hole that was ejected from its host galaxy as a result of a tussle between it and two other black holes. Image credit: NASA / ESA / Leah Hustak, STScI.

Hubble Spots Runaway Supermassive Black Hole

Apr 11, 2023 by Enrico de Lazaro

The newly-discovered supermassive black hole resides in a compact star-forming galaxy around 7.7 billion years away and has a mass of 20 million solar...

This Hubble image shows UGCA 307, a dwarf galaxy some 26 million light-years away in the constellation of Corvus. Image credit: NASA / ESA / Hubble / R. Tully.

Hubble Spots Diminutive Dwarf Galaxy

Mar 13, 2023 by Enrico de Lazaro

NASA has released a stunning photo taken by the NASA/ESA Hubble Space Telescope of the dwarf galaxy UGCA 307. This Hubble image shows UGCA 307, a dwarf...

Two dwarf-dwarf galaxy mergers in galaxy clusters Abell 133 (left) and Abell 1758S (right) are shown in X-rays from Chandra and optical light from the Canada-France-Hawaii telescope. The merger on the left is in a late stage and was given the single name of Mirabilis. The other merger is in the early stages and the two dwarf galaxies are named Elstir (bottom) and Vinteuil (top). Image credit: NASA / CXC / University of Alabama / Micic et al. / International Gemini Observatory / NOIRLab / NSF / AURA.

Chandra Spots Two Pairs of Supermassive Black Holes on Collision Courses

Feb 23, 2023 by News Staff

According to observations and cosmological simulations, dwarf galaxies are the most abundant type of galaxies in the early Universe and the galaxy merger...

This Hubble image shows Donatiello II (center), an ultra-faint dwarf galaxy some 11.4 million light-years away in the constellation of Sculptor. Image credit: NASA / ESA / Hubble / B. Mutlu-Pakdil / G. Donatiello.

Hubble Observes Ultra-Faint Dwarf Galaxy Donatiello II

Feb 6, 2023 by Enrico de Lazaro

A new image taken with NASA/ESA Hubble Space Telescope shows Donatiello II, a recently-discovered dwarf galaxy associated with the nearby spiral galaxy...

This Hubble image shows the dwarf irregular galaxy UGC 7983. Image credit: NASA / ESA / Hubble / R. Tully.

Hubble Space Telescope Spies UGC 7983

Jan 16, 2023 by Enrico de Lazaro

UGC 7983 is a dwarf irregular galaxy, a type thought to be similar to the very earliest galaxies in the Universe. This Hubble image shows the dwarf irregular...

This image, taken by the Near-Infrared Camera (NIRCam) onboard the NASA/ESA/CSA James Webb Space Telescope, shows the star cluster NGC 346. Webb reveals the presence of many more building blocks than previously expected, not only for stars, but also planets, in the form of clouds packed with dust and hydrogen. The plumes and arcs of gas in this image contains two types of hydrogen. The pink gas represents energized hydrogen, which is typically as hot as around 10,000 degrees Celsius (approximately 18,000 degrees Fahrenheit) or more, while the more orange gas represents dense, molecular hydrogen, which is much colder at around minus 200 degrees Celsius or less (approximately minus 300 degrees Fahrenheit), and associated dust. The colder gas provides an excellent environment for stars to form, and, as they do, they change the environment around them. The effect of this is seen in the various ridges throughout, which are created as the light of these young stars breaks down the dense clouds. The many pillars of glowing gas show the effects of this stellar erosion throughout the region. In this image blue was assigned to the wavelength of 2.0 microns (F200W), green was assigned to 2.77 microns (F277W), orange was assigned to 3.35 microns (F335M), and red was assigned to 4.44 microns (F444W). Image credit: NASA / ESA / CSA / O. Jones, UK ATC / G. De Marchi, ESTEC / M. Meixner, USRA / A. Pagan, STScI / N. Habel, USRA / L. Lenkic, USRA / L. Chu, NASA’s Ames Research Center.

Webb Probes Most Massive Star-Forming Region of Small Magellanic Cloud

Jan 13, 2023 by Enrico de Lazaro

Astronomers using the NASA/ESA/CSA James Webb Space Telescope have revealed many new pockets of star formation in NCG 346, an open star cluster in the...

This Hubble image shows the globular cluster NGC 1850, which is located in the Large Magellanic Cloud, over 160,000 light-years from Earth. For this image, five filters were used with the camera to gather data. Two of the filters were at near-ultraviolet wavelengths, two more at visible light wavelengths, and the final one was in the near-infrared. The data gathered through the two ultraviolet filters is violet and blue. The data from the two visible light filters is green and orange. The color red denotes near-infrared data. The image follows chromatic order, which means the shortest wavelength in the image is blue while the longest wavelength is red. Chromatic order allows us to visualize wavelengths of light beyond our eye’s sensitivity in a way that is familiar to us. Image credit: NASA / ESA / N. Bastian, Donostia International Physics Center / Gladys Kober, NASA & Catholic University of America.

Hubble Space Telescope Captures Dual Views of NGC 1850

Jan 3, 2023 by Enrico de Lazaro

Astronomers using the NASA/ESA Hubble Space Telescope have taken two amazing images of NGC 1850, a young globular cluster located in the Large Magellanic...

This artist’s illustration emphasizes the shape of the stellar halo surrounding our Milky Way Galaxy. Image credit: Melissa Weiss / Harvard & Smithsonian’s Center for Astrophysics.

Milky Way’s Stellar Halo is Oblong and Tilted, Astronomers Say

Nov 21, 2022 by News Staff

Accounting for approximately 1% of the total stellar mass, the stellar halo — the diffuse cloud of stars surrounding the Galactic disk — plays...

This image, taken by the Near-Infrared Camera aboard the NASA/ESA/CSA James Webb Space Telescope, displays countless stars in the dwarf irregular galaxy Wolf-Lundmark-Melotte as well as dozens of background galaxies. The image includes 0.9-micron light shown in blue, 1.5-micron in cyan, 2.5-micron in yellow, and 4.3-micron in red. Image credit: NASA / ESA / CSA / STScI / K. McQuinn, Rutgers University / A. Pagan, STScI.

Webb Focuses on Isolated Dwarf Galaxy

Nov 10, 2022 by Enrico de Lazaro

The new image of the dwarf irregular galaxy Wolf-Lundmark-Melotte demonstrates the remarkable ability of the NASA/ESA/CSA James Webb Space Telescope to...

Shown here in purple, the Magellanic Corona stretches more than 100,000 light-years from the main mass of stars, gas, and dust that make up the Magellanic Clouds, intermingling with the hotter and more extensive corona that surrounds the Milky Way. Image credit: Leah Hustak, STScI.

Magellanic Corona: Astronomers Detect Protective Shield around Small and Large Magellanic Clouds

Oct 4, 2022 by News Staff

The Small and Large Magellanic Clouds — satellite galaxies of the Milky Way Galaxy — are surrounded by a diffuse halo of hot, supercharged...

Crocker et al. reveal that the Fermi cocoon is actually due to emission from the Sagittarius dwarf spheroidal galaxy. Image credit: O. Macias.

Astronomers Detect Gamma Rays from Sagittarius Dwarf Spheroidal Galaxy

Sep 6, 2022 by Enrico de Lazaro

The significant gamma-ray emission is coming from a population of millisecond pulsars within the Sagittarius dwarf spheroidal galaxy, an elliptical loop-shaped...

This Hubble image shows NGC 1156, a dwarf irregular galaxy located 25 million light-years away in the constellation of Aries. The color image was made from separate exposures taken in the ultraviolet, visible and near-infrared regions of the spectrum with Hubble’s Wide Field Planetary Camera 2 (WFPC2) and Advanced Camera for Surveys (ACS). It is based on data obtained through five filters. The color results from assigning different hues to each monochromatic image associated with an individual filter. Image credit: NASA / ESA / Hubble / R.B. Tully / R. Jansen / R. Windhorst.

Hubble Observes Magellanic-Type Dwarf Irregular Galaxy

Aug 22, 2022 by Enrico de Lazaro

The NASA/ESA Hubble Space Telescope has produced a spectacularly detailed image of an isolated dwarf irregular galaxy called NGC 1156. This Hubble image...

This image shows the ultra-faint dwarf galaxy Pegasus V (center). Image credit: International Gemini Observatory / NOIRLab / NSF / AURA / T.A. Rector, University of Alaska Anchorage & NSF’s NOIRLab / M. Zamani, NSF’s NOIRLab / D. de Martin, NSF’s NOIRLab.

Pegasus V: New Ultra-Faint Dwarf Galaxy Spotted in Outskirts of Andromeda

Jul 1, 2022 by News Staff

Astronomers have discovered a new ultra-faint dwarf galaxy in the constellation of Pegasus and characterized it using deep imaging with the Gemini Multi-Object...

This Hubble image shows the outskirts of the Tarantula Nebula. Image credit: NASA / ESA / Hubble / Josh Barrington.

Hubble Spots Glowing Plumes in Tarantula Nebula

Jun 30, 2022 by Enrico de Lazaro

NASA has released a beautiful photo taken by the Hubble Space Telescope of the outskirts of the Tarantula Nebula, which is located in the Large Magellanic...

Top left: a giant blue star, much more massive than our Sun, has consumed, through nuclear fusion at its center, all its hydrogen, helium, and heavier elements up to iron. It now has a small iron core (red dot) at its center. Unlike the earlier stages of fusion, the fusion of iron atoms absorbs, rather than releases, energy. The fusion-released energy that has held up the star against its own weight now is gone, and the star will quickly collapse, triggering a supernova explosion. Top right: the collapse has begun, producing a superdense neutron star with a strong magnetic field at its center (inset). The neutron star, though containing about 1.5 times the mass of the Sun, is only about the size of Manhattan. Bottom left: the supernova explosion has ejected a fast-moving shell of debris outward into interstellar space. At this stage, the debris shell is dense enough to shroud from view any radio waves coming from the region of the neutron star. Bottom right: As the shell of explosion debris expands over a few decades, it becomes less dense and eventually becomes thin enough that radio waves from inside can escape. This allowed observations by the VLA Sky Survey to detect bright radio emission created as the rapidly spinning neutron star’s powerful magnetic field sweeps through the surrounding space, accelerating charged particles. This phenomenon is called a pulsar wind nebula. Image credit: Melissa Weiss, NRAO / AUI / NSF.

Astronomers Spot Pulsar Wind Nebula in Distant Dwarf Galaxy

Jun 15, 2022 by News Staff

A pulsar wind nebula is created when the powerful magnetic field of a rapidly spinning neutron star accelerates surrounding charged particles to nearly...

Growing, massive black holes reside in dwarf galaxies, where their radiation competes with the light of abundant young stars. Image credit: NASA / ESA / Hubble / M. Polimera.

Growing Massive Black Holes More Common in Dwarf Galaxies than Previously Thought

May 24, 2022 by News Staff

Using data from the REsolved Spectroscopy Of a Local VolumE (RESOLVE) and the Environmental COntext Catalog (ECO) surveys, astronomers have found evidence...

This Hubble image shows the elliptical galaxy NGC 541 and a star-forming peculiar galaxy called Minkowski’s object. Image credit: NASA / ESA / S. Croft, Eureka Scientific Inc. / Gladys Kober, NASA’s Goddard Space Flight Center / Catholic University of America.

Hubble Space Telescope Spots Strange Pair of Galaxies

May 24, 2022 by Enrico de Lazaro

Astronomers have released a stunning image snapped by the NASA/ESA Hubble Space Telescope of the huge elliptical galaxy NGC 541 and its much smaller companion...

This Hubble image shows Hickson Compact Group 31, a group of four galaxies located some 166 million light-years away in the constellation of Eridanus. The bright, distorted object is actually two colliding dwarf galaxies. The bluish star clusters have formed in the streamers of debris pulled from the galaxies and at the site of their head-on collision. The cigar-shaped object to the right is another member of the group. A bridge of star clusters connects the trio. A longer rope of bright star clusters points to the fourth member of the group. The bright object in the center is a foreground star. Image credit: NASA / ESA / J. Charlton, Pennsylvania State University / G. Kober, NASA’s Goddard Space Flight Center / Catholic University of America.

Hubble Images Four Merging Dwarf Galaxies

May 18, 2022 by Enrico de Lazaro

NASA has released a stunning new image snapped by the NASA/ESA Hubble Space Telescope of a quartet of galaxies called Hickson Compact Group 31. This Hubble...

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