Large angular scale fluctuations of near infrared extragalactic background light based on the IRTS observations

Understand

We measure the spatial fluctuations of the Near-Infrared Extragalactic Background Light (NIREBL) from 2$^{\circ}$ to 20$^{\circ}$ in angular scale at the 1.6 and 2.2 $\mu$m using data obtained with Near-Infrared Spectrometer (NIRS) on board the Infrared Telescope in Space (IRTS).

• The brightness of the NIREBL is estimated by subtracting foreground components such as zodiacal light, diffuse Galactic light, and integrated star light from the observed sky.
• The foreground components are estimated using well-established models and archive data.
• The NIREBL fluctuations for the 1.6 and 2.2 $\mu$m connect well toward the sub-degree scale measurements from previous studies.