Recent content by atomiclaser

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    Undergrad How to measure a 21 cm EM wave if it is Doppler shifted?

    we know that all emission from asctrophysical context is doppler shifted. So, how to make sure the doppler shifted 21 cm not contaminated by some other emission?
    • atomiclaser
    • Thread
    • Doppler Doppler shift Em Em wave Measure Wave
    • Replies: 1
    • Forum: Cosmology
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    Graduate Spin dynamics and the Pauli exclusion principle

    For high temperature superconductivity, people usually say two quasifree electrons are pairing, one is spin up and the other one is spin down. So, if that is the case, each two electrons will have zero spin angular momentum. Since the superconductivity is the magnetic properties and spin is the...
    • atomiclaser
    • Thread
    • Dynamics Pauli Pauli exclusion principle Principle Spin Superconductivity
    • Replies: 1
    • Forum: Quantum Physics
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    Graduate Collision-dominated plasma (stellar coronae)

    could you explain more what you mean " thermal plasma (i.e. in thermal equilibrium) and photoionized sounds like non-thermal. "?
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    Graduate Collision-dominated plasma (stellar coronae)

    The paper is "Helium-like ions as powerful X-ray plasma diagnostics" Proceedings of “X-ray Astronomy 2000”, Palermo, Sep. 2000 ASP Conference Series, Vol. TBD (in press), 2001 R. Giacconi, L. Stella, S. Serio [Mentors note: arXiv link at https://arxiv.org/abs/astro-ph/0012218v2] By the way, why...
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    Undergrad X-ray Astronomy: Charged Ions Energy Distribution

    I don't know till now. If you know some publications about that, please let me know.
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    Undergrad X-ray Astronomy: Charged Ions Energy Distribution

    Does anyone know the energy distribution of highly charged ions in solar wind or other astrophysical context?
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    Undergrad Foreground & Background in Astrophysical Observation

    that means there are some other star or galaxy beyond the interested astrophysical object, the lumination from them could be called foreground. If I understand correctly, all the astrophysical obsevation has foreground and background, these consist of the whole observation. The pictures often...
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    Undergrad Foreground & Background in Astrophysical Observation

    thanks for your explanation.
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    Undergrad Foreground & Background in Astrophysical Observation

    During the astrophsyical observation, what is the definition of foreground and background in astrophysical observation?