オブジェクトはパルサーですか


2

We have a star having 1.8 solar mass. Justify any four means (measurable/ observed properties) by which you can identify that the object is a Pulsar and not a white dwarf or a Black Hole.

つまり、明らかな特性の1つは質量です。質量> 1.4太陽質量なので、白色矮星ではないと言えます。

また、質量は3太陽質量未満であるため、ブラックホールではありません(ここでは大まかに言っています)。

また、周期的な放射パターンから、オブジェクトはパルサーである可能性があると言えます。

このオブジェクトを分類するには、他に2つの方法が必要です。

1
  1. As you said, the mass range of the object indicates that it could be a neutron star, rather than a black hole.

  2. But also the density of the object is a clue. The density of a neutron star is much higher than that of a stable white dwarf.

  3. Extremely regular electromagnetic pulses have to be observed. Known pulsars have a pulse period between 1.4 ms and 8.5 seconds.

  4. The wavelength of the pulses is in the radio range.

  5. Pulsars slow down gradually, at a known rate, so you can measure how the pulse period evolves over time, and check that is compatible with the slow-down rate of a pulsar.

Adapted from this page