Tag Archive for 'Sagittarius Dwarf Elliptical galaxy'

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...

All-sky map of the Milky Way in motion using the Gaia data. Areas with significant motion are shown in black/purple and those with relatively low motion in yellow. A number of large scale filamentary disc structures are evident about the midplane. The map also shows the Magellanic Clouds and their connecting stellar bridge to left, while the Sagittarius dwarf galaxy currently being torn apart can be seen on the right (main body). Image credit: Laporte et al., doi: 10.1093/mnrasl/slab109.

Astronomers Find Fossil Spiral Arms in Milky Way Galaxy

Dec 15, 2021 by News Staff

Using data from ESA’s Gaia satellite and archival spectroscopic surveys, astronomers have mapped the Milky Way disk substructure at distances over 10,000...

Data from more than 1.8 billion stars have been used to create this map of the entire sky. It shows the total brightness and color of stars observed by ESA’s Gaia satellite and released as part of Gaia’s Early Data Release 3. Brighter regions represent denser concentrations of bright stars, while darker regions correspond to patches of the sky where fewer and fainter stars are observed. The color of the image is obtained by combining the total amount of light with the amount of blue and red light recorded by Gaia in each patch of the sky. The bright horizontal structure that dominates the image is the plane of our Milky Way Galaxy. It is actually a flattened disk seen edge-on that contains most of the Galaxy’s stars. In the middle of the image, the Galactic center appears bright, and thronged with stars. Darker regions across the Galactic plane correspond to foreground clouds of interstellar gas and dust, which absorb the light of more distant stars. Many of these clouds conceal stellar nurseries where new generations of stars are currently being born. Dotted across the image are also many globular and open clusters, as well as entire galaxies beyond our own. The two bright objects in the lower right of the image are the Large and Small Magellanic Clouds, two dwarf galaxies orbiting the Milky Way. Image credit: ESA / Gaia / DPAC / CC BY-SA 3.0 IGO / A. Moitinho.

ESA’s Gaia Mission Releases Data on More Than 1.8 Billion Stars

Dec 3, 2020 by News Staff

Astronomers from the Gaia Data Processing and Analysis Consortium released today the most detailed ever catalogue of Milky Way stars. The new data set,...

An artist’s impression of a perturbation in the velocities of stars in the Milky Way Galaxy that was revealed by ESA’s star mapping mission Gaia. Image credit: ESA.

Collision between Milky Way and Its Satellite May Have Triggered Formation of Our Solar System

May 26, 2020 by News Staff

Repeated collisions with the Sagittarius dwarf galaxy may have triggered major star formation episodes in our Milky Way Galaxy, one of which roughly coincided...

The structure of our Milky Way Galaxy with its warped Galactic disk, where the majority of its hundreds of billions of stars reside. Data from ESA’s Gaia spacecraft recently proved that the disk’s warp is precessing, essentially moving around similarly to a wobbling spinning top. The speed of the warp’s rotation is so high that it must have been caused by a rather powerful event, astronomers believe, perhaps an ongoing collision with another, smaller, galaxy which sends ripples through the disk like a rock thrown into water. Image credit: Stefan Payne-Wardenaar / NASA / JPL-Caltech / ESA.

Milky Way’s Warp Caused by Recent or Ongoing Encounter with Satellite Galaxy

Mar 3, 2020 by News Staff

Data from ESA’s Gaia star-mapping satellite show that the warped disk of our Milky Way Galaxy precesses, or wobbles, similarly to the motion of a spinning...

Gaia Sees Effects of Milky Way’s Close Encounter with Sagittarius Dwarf Galaxy

Sep 20, 2018 by News Staff

Astronomers analyzing data from the second release of ESA’s star mapping mission Gaia have shown that our Milky Way Galaxy is still enduring the effects...

Stellar streams around the Milky Way Galaxy. Image credit: NASA / JPL-Caltech / R. Hurt, SSC & Caltech.

Milky Way’s Most Distant Stars Might Be Ripped from Sagittarius Dwarf Elliptical Galaxy

Jan 12, 2017 by News Staff

Milky Way’s 11 most distant stars are located roughly 300,000 light-years away from us. According to a team of astronomers at Harvard University, five...

This image shows the globular star cluster Palomar 12. Image credit: ESA / Hubble / NASA.

Hubble Spies Distant Globular Cluster Palomar 12

Feb 16, 2015 by News Staff

The Advanced Camera for Surveys on board NASA’s Hubble Space Telescope has captured a beautiful image of a globular star cluster called Palomar 12. This...