Spectra Analysis
Welcome to the Spectra Analysis section of the Ad-Astra-Analysis-Suite. Here you can upload and analyze your spectra data using various tools and techniques. Use the navigation menu to access different spectra analysis features.
Available Tools
- Simple Flux Analysis — Upload a spectrum image, extract a 1-D profile, mark line regions, and measure integrated and peak flux values.
- Continuum Fitting & Subtraction — Interactively mark anchor regions, fit a polynomial or cubic-spline continuum, subtract it, and inspect the residual spectrum.
- Line Profile Fitting — Fit Gaussian, Lorentzian, or Voigt profiles (up to 3 components) to spectral lines; reports FWHM, amplitude, and integrated flux.
- Redshift & Velocity Measurement (Step 3.1) — Compute redshift and recession velocity (non-relativistic and relativistic) from identified line shifts; cross-correlate against built-in spectral templates to estimate z automatically.
- Equivalent Width Measurement (Step 3.2) — Mark blue and red continuum anchors and the line window on the spectrum; integrates the normalised profile to report EW, uncertainty, integrated flux, and line type (absorption/emission).
- Spectral Comparison & Library Matching (Step 4.1) — Overlay your spectrum against a library of stellar (O–M), nebular (H II, PN, SNR), galaxy (spiral, elliptical, starburst), and AGN templates; auto-matches by Pearson correlation and reports physical parameters.
- Signal-to-Noise & Quality Metrics (Step 4.2) — Compute per-pixel SNR using a rolling MAD noise window; flags low-SNR regions, reports per-line SNR, and generates an exportable quality summary.
- Frequency-Domain & Signal Processing (Step 5.1) — Real-valued FFT power and phase spectra; Savitzky-Golay, Butterworth, and median spectral filtering with residual display; normalised autocorrelation; Wiener deconvolution with user-supplied PSF.
- Spectral Indices, Band Ratios & Material Classification (Step 5.2) — Compute standard indices (D4000, Hβ Lick, Mg b, NDVI, hematite, clay) with uncertainty; absorption-band mineral matching (quartz, olivine, calcite, kaolinite, …); custom band-ratio builder.
- Heritage Pigment Identification (Step 6.1) — Spectral angle mapping (SAM) against 17 historic pigment reference spectra; NNLS mixture unmixing with fractional abundance bar chart; degradation product screening; reference overlay chart.
- Provenance, Authenticity & Ensemble Analysis (Step 6.2) — PCA projection with Mahalanobis anomaly detection; multi-metric comparison (cosine, Pearson, χ², SAM) against a user reference; Pb-isotope bivariate provenance field mapping for 5 reference regions.