Speaker
Description
The DA 495 region, where the pulsar wind nebula DA 495 and several very-high-energy (VHE; > 100 GeV) gamma-ray sources are closely separated in projected angular distance, has shown inconsistent results among different experiments. To investigate the origin of VHE gamma-ray emission in this region and address the observed discrepancies, we have performed a dedicated analysis using 3,071 days of High-Altitude Water Cherenkov (HAWC) data. We identify three extended sources, HAWC J1952+2924 (DA 495), J1954+2837, and J1958+2848, all with curved spectra. Additionally, we find a hint of a potential fourth source, characterized by a large spatial extension. A multi-wavelength analysis of DA 495 supports a leptonic origin of the emission without the necessity of hadronic components. On the other hand, the other two sources, which have no detections at other wavelengths, are interpreted as TeV halos associated with the nearby middle-aged pulsars PSRs J1954+2836 and J1958+2846. This work resolves the existing discrepancies, offering a more complete picture of the VHE gamma-ray sources and particle acceleration in the DA 495 region.
