Spectral signatures of axionlike dark matter

We derive spectral line shapes of the expected signal for a haloscope experiment searching axionlike dark matter. The knowledge these is needed to optimize an experimental design and data analysis procedure. extend previously known results axion-photon axion-gluon couplings case gradient (axion-fermion) coupling. A unique feature interaction its dependence not only on magnitudes but also directions velocities galactic halo particles, which leads directional sensitivity corresponding haloscope. discuss daily annual modulations caused by Earth's rotational orbital motions. In detection, periodic will be important confirmation that sourced particles in our Galaxy.