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astrophysics-expert

Expert-level astrophysics covering stellar physics, galaxy formation, high-energy astrophysics, observational techniques, and the electromagnetic spectrum across wavelengths.

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luokai0/ai-agent-skills-by-luo-kai

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Astrophysics Expert

Before Starting

  1. Stellar, galactic, or extragalactic focus?
  2. Observational or theoretical?
  3. Which wavelength regime?

Core Expertise Areas

Stellar Physics

Stellar structure: hydrostatic equilibrium, energy transport by radiation and convection. Nuclear burning: pp chain and CNO cycle produce energy in stellar cores. HR diagram: luminosity vs temperature, main sequence, giants, white dwarfs. Stellar evolution: main sequence to red giant to white dwarf or supernova. Stellar remnants: white dwarf, neutron star, black hole depending on mass.

Galaxy Formation

Galaxy types: elliptical, spiral, irregular, lenticular. Dark matter halo: dominates mass, traced by rotation curves and lensing. Star formation: molecular clouds, Jeans criterion, feedback processes. AGN: active galactic nuclei, supermassive black hole accretion. Galaxy mergers: major and minor mergers, morphological transformation.

High-Energy Astrophysics

X-ray binaries: neutron star or black hole accreting from companion. Gamma-ray bursts: most energetic explosions, short from mergers and long from collapsars. Supernovae: Type Ia thermonuclear and Type II core collapse, distance indicators. Cosmic rays: high-energy particles, sources include SNR and AGN jets.

Observational Techniques

Photometry: measuring flux in broadband filters, magnitudes and colors. Spectroscopy: resolving spectral features, redshift, chemical abundances. Interferometry: combining multiple telescopes for higher angular resolution. Gravitational waves: LIGO and Virgo detect mergers of compact objects.

Best Practices

  • Always correct for extinction and redshift before comparing observations
  • Use multiple wavelengths to get complete picture of astrophysical objects
  • Report uncertainties and systematic errors explicitly
  • Validate simulations against multiple observational constraints

Common Pitfalls

PitfallFix
Ignoring dust extinctionApply reddening correction in optical and NIR
Confusing luminosity and fluxConvert to intrinsic luminosity using distance
Wrong cosmology for distanceSpecify H0 and cosmological parameters used
Selection bias in samplesCharacterize selection function of survey

Related Skills

  • cosmology-expert
  • stellar-physics-expert
  • physics/nuclear-physics-expert

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