Exam 11: Neutron Stars and Black Holes

As material flows into a black hole as viewed from well outside the event horizon

The escape velocity at the event horizon around a black hole is

Order the following from most to least dense:

Neutron stars were first discovered in the 1930's.

Which object can be a pulsar?

The search for black holes involves searching for

The peculiar system SS 433 I. is emitting beams of energy and matter. II. is producing a spectrum with both a red and a blue shift. III. probably contains an accretion disk. IV. is the result of a planetary nebula.

The lighthouse in the above picture represents which model for which compact object?

The Crab pulsar emits light in which wavelength bands?

The above cartoon drawing is of a pulsar with its rotation axis aligned with it magnetic axis.

The first pulsar was discovered by _ _____ ___ in November of 1967.

The Schwarzschild radius of a 1- black hole is approximately

The ____________________ of a black hole in a binary system can emit X-rays and allow us to detect the presence of the black hole.

The white line is pointing to which object in the X-ray image above?

Millisecond pulsars that are very old are

A(n) ____________________ periodically emits large amounts of X-ray radiation as material accretes around a neutron star or black hole.

A pulsar requires that a neutron star I. rotate rapidly. II. have a radius of at least 10 km. III. have a strong magnetic field. IV. rotate on an axis that is different from the axis of the magnetic field.

How can an old pulsar have a very short pulsar period, say less than 0.03 seconds?

In the above graph of a pulsar's motion in a binary from 0 to 2.5 hours, the radial velocity represents how fast the compact object is traveling away from Earth.

Observations from the Compton Gamma Ray Observatory showed that gamma-ray bursters were located throughout the sky. This told us that