The Sagittarius Dwarf Spheroidal Galaxy (Sgr dSph), also known as the Sagittarius Dwarf Elliptical Galaxy (Sgr dE or Sag DEG), is an elliptical loop-shaped satellite galaxy of the Milky Way. What is ripping apart the Sagittarius dwarf spheroidal galaxy? Where do we think life first formed on the Earth? Stars in elliptical galaxies that appear spherical in shape have velocities that: Active star formation does not occur in elliptical galaxies because they: Spiral structure can be triggered in a disk galaxy by: a close encounter with a passing galaxy, an orbiting dwarf galaxy, an off-center burst of star formation in the disk. Recent observations indicate that in Although elliptical and irregular galaxies have been observed in both dwarf and giant varieties, we find only giant spiral galaxies. it allows us to study neutral hydrogen in the interstellar medium. [16][17], Based on its current trajectory, the Sgr dSph main cluster is about to pass through the galactic disc of the Milky Way within the next hundred million years, while the extended loop-shaped ellipse is already extended around and through our local space and on through the Milky Way galactic disc, and in the process of slowly being absorbed into the larger galaxy, calculated at 10,000 times the mass of Sgr dSph. The AVERAGE density of the interstellar medium is: Dust appears dark in __________ wavelengths and bright in __________ wavelengths. [7], In 2018, the Gaia project of the European Space Agency, designed primarily to investigate the origin, evolution and structure of the Milky Way, delivered the largest and most precise census of positions, velocities and other stellar properties of more than a billion stars, which showed that Sgr dSph had caused perturbations in a set of stars near the Milky Way's core, causing unexpected rippling movements of the stars triggered when it sailed past the Milky Way between 300 and 900 million years ago. Where do we think life first formed on the Earth? Sagittarius A*, the radio source located at the center of our galaxy, is believed to be: How have astronomers measured the mass of the black hole at the center of our galaxy? All globular cluster stars have some amount of heavy elements. It will enhance any encyclopedic page you visit with the magic of the WIKI 2 technology. Massachusetts Institute of Technology (MIT) astronomers have detected 18 very metal-poor stars in the Sagittarius dwarf galaxy. There are many more individual stars residing in the Milky Way stellar halo than inside globular clusters. The oldest disk stars are both __________ and __________ compared to halo stars. TRUE OR FALSE: Our galaxy is a typical barred spiral galaxy. When radiation from an object passes through the interstellar medium: Dust that is heated to 30 K will emit a blackbody spectrum that peaks at: If you wanted to study regions where star formation is currently happening you could use: Hydrogen emission to look for O and B stars. [15][16][clarification needed], Sgr dSph has multiple stellar populations, ranging in age from the oldest globular clusters (almost as old as the universe itself) to trace populations as young as several hundred million years (mya). Globular clusters have much higher stellar densities than the local solar neighborhood. Sagittarius Dwarf galaxy What process is most responsible for shaping the large-scale structure of the universe? Halo stars formed before the Milky Way developed a thin stellar disk. Why not? It contains four globular clusters, with the brightest of them â NGC 6715 (M54) â being known well before the discovery of the galaxy itself in 1994. We can determine the 3-dimensional shape of any individual elliptical galaxy by photographing it. the gravitational tidal force of the Milky Way. Our Galaxy is being invaded. Don't worry, our Galaxy is not in danger, On average, we expect that __________ stars have the __________ percentage of heavy elements. The AVERAGE density of the interstellar medium is: Dust appears dark in __________ wavelengths and bright in __________ wavelengths. Halo stars near the Sun are distinguished from disk stars by what characteristics? Sagittarius A*, the radio source located at the center of our galaxy, is believed to be: supermassive black hole What is ripping apart the Sagittarius dwarf spheroidal galaxy? TRUE OR FALSE: The lowest-density gas in the interstellar medium is also the coldest. Would you like Wikipedia to always look as professional and up-to-date? In 2003 with the aid of infrared telescopes and super computers, Steven Majewski, Michael Skrutskie, and Martin Weinberg were able to help create a new star map, picking out the full Sagittarius Dwarf presence, position, and looping shape from the mass of background stars and finding this smaller galaxy to be at a near right angle to the plane of the Milky Way. No, the cosmological constant is nonzero. Although it is one of the closest companion galaxies to the Milky Way, the main parent cluster is on the opposite side of the galactic core from Earth, and consequently is very faint, although covering a large area of the sky. our Galaxy several times before, and survived! (MTU) & More luminous giant galaxies tend to have __________ supermassive black holes at their centers. What is ripping apart the Sagittarius dwarf spheroidal galaxy? Bonnell (USRA) We observe molecular hydrogen gas (H2) using 21-cm emission. The gravitational tidal force of the Milky Way. By observing the motions of stars near the center of the galaxy. If the most pessimistic assumptions in the Drake equation were true, we would: have to wait for approximately 60 million years to get a message back from the nearest intelligent life. Why is 21-cm radiation a good spiral arm tracer? Oddly, however, The type of AGN we see depends mostly on the angle at which we view the galaxy. Open star clusters primarily inhabit which part of spiral galaxies? Open clusters are only found in the disk of the Milky Way; globular clusters are only found in the halo of the Milky Way. Michigan Tech. Most of the mass in our galaxy is in the form of: Which of the following are NOT found in our galaxy's halo? Is Einstein's "biggest blunder" still considered a mistake? Its detection is comparatively recent because it is faint, and its proximity means that its constituent stars are spread over a large part of the sky, heavily obscured by the many foreground stars of our own Milky Way . Cluster A is 10 times farther away than Cluster B. featured, along with a brief explanation written by a professional [8], A 2019 study by Melendez and co-authors concluded that Sgr dSph had a decreasing metallicity trend as a function of radius, with a larger spread in metallicity in the core relative to the outer regions. Open clusters are only found in the disk of the Milky Way; globular clusters are only found in the halo of the Milky Way. ?? ⪠Four tidal tails of Sagittarius dwarf galaxy, ⪠Sagittarius dwarf galaxy passes galactic center of the Milky Way. Is Einstein's "biggest blunder" still considered a mistake? Dark energy is a force that continually decreases the expansion rate of the universe. It consists of four globular clusters, the main cluster having been discovered in 1994. Galaxies that are classified as quasars were much more numerous in the past. What is ripping apart the Sagittarius dwarf spheroidal galaxy? The concept of inflation helps solve both the problems of the flatness of the universe and smoothness of the cosmic background radiation. Most of the mass in our galaxy is in the form of: Why is 21-cm radiation the best way to map the spiral arms in the Milky Way? There is a 10^9 M¤ black hole at the center of the Milky Way that is rapidly accreting stars and gas. The location and motions of interstellar gas can be strongly affected by what? by observing the motions of stars near the center of the galaxy.
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