When We Look At The Orbital Speeds Of Stars In The Milky Way, We At First Expected

Where in the Milky Way would you be most likely to find O type stars?

O-type stars are typically located in regions of active star formation such as the spiral arms of a spiral galaxy or a pair of galaxies undergoing collision and merger (such as the Antennae Galaxies).

What do we mean when we say that the rotation curve for the Milky Way galaxy is flat?

We construct its rotation curve by measuring Doppler shifts from gas clouds at different distances from the galaxy’s center. What do we mean when we say that the rotation curve for a spiral galaxy is “flat”? … It bends or distorts the light coming from galaxies located behind it.

What wavelength should you use to measure a rotation curve in the Milky Way?

One of the most powerful techniques of measuring the rotation curve of the Galaxy is from the Doppler shift of clouds of HI emission line. This neutral hydrogen radio line at a wavelength of 21 cm is useful because it is not strongly scattered or absorbed by interstellar dust.

How do we measure dark matter in the Milky Way?

The result from studies of many such gravitational lens clusters shows that like individual galaxies galaxy clusters contain more than ten times as much dark matter as luminous matter. The third method astronomers use to detect and measure dark matter in galaxy clusters is to image them in the light of X-rays.

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Where’s the center of the Milky Way?

The center of our Milky Way galaxy is located some 26 000 light years away in the constellation of Sagittarius! That is very far even on a galactic scale. Our galaxy is shaped like a large distorted pinwheel with upwards of 200 billion stars!Aug 22 2019

Why is the Milky Way galaxy different from most spiral galaxies?

The Milky Way – the galaxy that includes Earth and our solar system – is an example of a spiral galaxy. … Most spiral galaxies contain a central bulge surrounded by a flat rotating disk of stars. The bulge in the center is made up of older dimmer stars and is thought to contain a supermassive black hole.

What is a rotation curve astronomy quizlet?

What is a rotation curve? a graph showing how orbital velocity depends on distance from the center for a spiral galaxy.

What does the rotation curve of our galaxy tell us quizlet?

What does the rotation curve of our Galaxy tell us about the Galaxy’s total mass? It tells us that the galaxy is much bigger then we expected and that the luminous part of the galaxy is only the ‘tip of the iceberg’.

Why do stars orbit faster in spiral galaxies?

In spiral galaxies the velocities of stars far from the centre are much faster than expected. Normally circular motion is governed by a balance between gravity (pulling the star towards the galactic centre) and an effective centrifugal force (pulling the star outwards).

How do you find the rotation of a curve?

The rotation curves of galaxies can be measured using neutral hydrogen observations with radio telescopes. By equating the gravitational force to the centrifugal force we can estimate the mass inside a certain radius.

How can we measure the rotation velocities of stars in a galaxy?

One of the most famous — and prevalent — of these features is Hydrogen-alpha (or Hα) which lies at precisely 656.28 nanometers (for a non-moving source). To measure the rotational speed of a galaxy we map out a line like Hα across the galaxy and compare it to the value from a source at rest.

What does the orbital velocity of stars suggest about the mass of our galaxy?

What does the orbital velocity of stars suggest about the mass of our galaxy? That it is more massive than we would expect from the observed stars. … different amounts of gravity holding the clusters together different masses of stars in clusters and different ages.

Is there dark matter in the Milky Way?

Astronomers believe that dark matter shrouds the Milky Way — and other galaxies — in an elusive halo that extends far out into space. Scientists have estimated that there is five times as much dark matter in the universe as visible matter.

How does dark matter affect the Milky Way?

Without some additional matter exerting a gravitational pull the galaxies would fly apart. … Dark matter also makes its presence known through gravitational lensing. The dark matter halo of a nearby galaxy distorts the light from background galaxies into a ring of mirages around the closer galaxy.

How much dark and luminous matter do we believe the Milky Way consists of?

Scientists can’t directly detect the material but like black holes they can measure it based on its effect on the objects around it. As such dark matter is estimated to make up 90 percent of the mass of the galaxy.

Are all the stars we see in the Milky Way?

All of the stars we see with the eye alone belong to our Milky Way galaxy. … But we still can’t see individual stars within this galaxy – not with the eye alone. Even with amateur telescopes the patch of light that we see as the Andromeda galaxy looks at best like haze.

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What does the Milky Way orbit?

Meanwhile our entire solar system – our sun with its family of planets moon asteroid and comets – orbits the center of the Milky Way galaxy. Our sun and solar system move at about about 500 000 miles an hour (800 000 km/hr) in this huge orbit.

How do stars move in a spiral galaxy?

Our Galaxy like all other spiral galaxies is rotating. The stars move on orbits around the centre of the Galaxy. … Stars also have some random motions – they don’t orbit the galaxy in exact circles. This random motion usually amount to a few tens of km/s in some direction.

What type of stars are in spiral galaxies?

Spiral Galaxies

It is dominated by young blue Population I stars. The central bulge is devoid of gas and dust. As you might expect the bulge is composed primarily of Population II stars. Type c spiral galaxies have the most gas and dust.

Why are spiral galaxies spiral?

Astronomers believe that galaxies have spiral arms because galaxies rotate – or spin around a central axis – and because of something called “density waves.” … A spiral galaxy’s rotation or spin bends the waves into spirals. Stars pass through the wave as they orbit the galaxy center.

How does the rotation curve of the Milky Way galaxy imply the existence of dark matter?

By the same argument the flat galactic rotation curves seem to suggest that each galaxy is surrounded by significant amounts of dark matter. It has been postulated and generally accepted that the dark matter would have to be located in a massive roughly spherical halo enshrouding each galaxy.

Where is most of the Milky Way dark matter located quizlet?

1) Approximately 90 percent of the mass of the Milky Way is located in the halo of the galaxy in the form of dark matter.

What do the high speeds of stars in elliptical galaxies tell us quizlet?

What do the fast speeds of stars in elliptical galaxies tell us? There must be a lot of dark matter whose gravity can be felt but not seen. … individual galxies are moving so fast that they could not be held together by the gravity of visible matter. 3.

What does the rotation curve of our galaxy tell us about the galaxy’s total mass?

What does the rotation curve of our Galaxy tell us about the Galaxy’s total mass? … The rotation curve of the Milky Way Galaxy provides strong evidence for dark matter in the Milky Way. The matter we can see is half of the mass that Kepler’s law finds.

What is a rotation curve for a spiral galaxy?

Abstract Rotation curves of spiral galaxies are the major tool for determining the distribution of mass in spiral galaxies. They provide fundamental information for understanding the dynamics evolution and formation of spiral galaxies.

How does gravitational lensing tell us about the mass of a galaxy cluster?

How does gravitational lensing tell us about the mass of a galaxy cluster? The lensing allows us to determine the orbital speeds of galaxies in the cluster so that we can determine the mass of the cluster from the orbital velocity law.

Is Milky Way a spiral galaxy?

The Milky Way is a huge collection of stars dust and gas. It’s called a spiral galaxy because if you could view it from the top or bottom it would look like a spinning pinwheel. The Sun is located on one of the spiral arms about 25 000 light-years away from the center of the galaxy.

What is the speed of the Milky Way galaxy?

1.3 million miles per hour

And how fast is the Milky Way Galaxy moving? The speed turns out to be an astounding 1.3 million miles per hour (2.1 million km/hr)! We are moving roughly in the direction on the sky that is defined by the constellations of Leo and Virgo.

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How do the stars in the halo of the Milky Way differ from the stars in the arms?

How do the stars in the halo of the Milky Way differ from the stars in the arms? … Why is our galaxy called the Milky Way? The center is a spherical bulge while the arms are relatively flat. How is the center of the Milky Way different from the arms?

How do galaxies rotate?

We know that galaxy rotation is happening because the Milky Way is a flattened disk in the same way that the Solar System is a flattened disk. The centrifugal force from the rotation flattens out the galactic disk. All stars in the galactic disk follow roughly circular orbits around the center of the galaxy.

Do all galaxies rotate at the same speed?

In a study published March 9 in The Monthly Notices of the Royal Astronomical Society astronomers announced the discovery that all disk galaxies rotate about once every billion years no matter their size or mass. … These galaxies differed in both size and rotational velocity by up to a factor of 30.

What do rotation curves tell us?

Make inferences about a mass distribution given a rotation curve. A rotation curve is just a graph that tells you how the speed of things in a spinning system relates to the distance of those things from the rotation axis.

How is the speed of galaxies determined?

The velocity of the galaxy is determined by measuring the redshift of spectral lines in the spectrum of the galaxy. … Note that for each galaxy there are two lines of data under each “spectral lines” column.

Can we measure the speed at which galaxies move?

Astronomers use something called the “Hubble constant” to measure how fast this expansion is taking place.

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