VERITAS and Fermi -LAT Observations of TeV Gamma-Ray Sources Discovered by HAWC in the 2HWC Catalog
The High Altitude Water Cherenkov (HAWC) collaboration recently published their 2HWC catalog, listing 39 very high energy (VHE; >100 GeV) gamma-ray sources based on 507 days of observation. Among these, 19 sources are not associated with previously known teraelectronvolt (TeV) gamma-ray sources. We have studied 14 of these sources without known counterparts with VERITAS and Fermi-LAT. VERITAS detected weak gamma-ray emission in the 1 TeV–30 TeV band in the region of DA 495, a pulsar wind nebula coinciding with 2HWC J1953+294, confirming the discovery of the source by HAWC. Here, we did not find any counterpart for the selected 14 new HAWC sources from our analysis of Fermi-LAT data for energies higher than 10 GeV. During the search, we detected gigaelectronvolt (GeV) gamma-ray emission coincident with a known TeV pulsar wind nebula, SNR G54.1+0.3 (VER J1930+188), and a 2HWC source, 2HWC J1930+188. The fluxes for isolated, steady sources in the 2HWC catalog are generally in good agreement with those measured by imaging atmospheric Cherenkov telescopes. However, the VERITAS fluxes for SNR G54.1+0.3, DA 495, and TeV J2032+4130 are lower than those measured by HAWC, and several new HAWC sources are not detected by VERITAS. This is likely due to a change in spectral shape, source extension, or the influence of diffuse emission in the source region.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE
- Contributing Organization:
- The VERITAS Collaboration; The Fermi-LAT Collaboration; The HAWC Collaboration
- Grant/Contract Number:
- AC02-76SF00515; 271051; 232656; 260378; 179588; 239762; 254964; 271737; 258865; 243290; 132197
- OSTI ID:
- 1490368
- Journal Information:
- The Astrophysical Journal (Online), Vol. 866, Issue 1; ISSN 1538-4357
- Publisher:
- Institute of Physics (IOP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Web of Science
Non-thermal emission and spectral evolution properties of G54.1+0.3
|
journal | June 2019 |
Fate of a neutron star with an endoparasitic black hole and implications for dark matter
|
journal | December 2019 |
Constraints to Dark Matter Annihilation from High-Latitude HAWC Unidentified Sources
|
journal | December 2019 |
Multiwavelength Investigation of Pulsar Wind Nebula DA 495 with HAWC, VERITAS, and NuSTAR
|
journal | June 2019 |
Fate of a neutron star with an endoparasitic black hole and implications for dark matter | text | January 2019 |
Constraints to dark matter annihilation from high-latitude HAWC unidentified sources | text | January 2020 |
Similar Records
Extended gamma-ray sources around pulsars constrain the origin of the positron flux at Earth
The 2HWC HAWC Observatory Gamma-Ray Catalog