Techniques for Measuring Galactic Diffuse Emission Flux and their Preliminary Results in Confused Regions

Rho, Chang Dong; Solares, H. A. Ayala; Zhou, H.

doi:10.22323/1.301.0741

Cited by 2 publications

(2 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The nearby TeV γ-ray binary LS 5039 was not included in the model because its average flux is below the HAWC sensitivity and it was not significantly detected. Finally, the model also includes a Galactic diffuse emission (GDE) component, with a Gaussian shape along the Galactic latitude (b) with a fixed width of 1 • and peaked at b = 0 • based on previous HAWC studies (Rho et al 2018).…”

Section: Discussionmentioning

confidence: 99%

Evidence of 200 TeV photons from HAWC J1825-134

Albert,

Alfaro,

Alvarez

et al. 2020

Preprint

View full text Add to dashboard Cite

The Earth is bombarded by ultra-relativistic particles, known as cosmic rays (CRs). CRs with energies up to a few PeV (=10 15 eV), the knee in the particle spectrum, are believed to have a Galactic origin. One or more factories of PeV CRs, or PeVatrons, must thus be active within our Galaxy. The direct detection of PeV protons from their sources is not possible since they are deflected in the Galactic magnetic fields. Hundred TeV γ-rays from decaying π 0 , produced when PeV CRs collide with the ambient gas, can provide the decisive evidence of proton acceleration up to the knee. Here we report the discovery by the High Altitude Water Cherenkov (HAWC) observatory of the γray source, HAWC J1825-134, whose energy spectrum extends well beyond 200 TeV without a break or cutoff. The source is found to be coincident with a giant molecular cloud. The ambient gas density is as high as 700 protons/cm 3 . While the nature of this extreme accelerator remains unclear, CRs accelerated to energies of several PeV colliding with the ambient gas likely produce the observed radiation.

show abstract

Section: Discussionmentioning

confidence: 99%

Evidence of 200 TeV photons from HAWC J1825-134

Albert,

Alfaro,

Alvarez

et al. 2020

Preprint

View full text Add to dashboard Cite

show abstract

“…The diffuse background emission (DBE) is a systematic effect arising from any unresolved sources and the true Galactic diffuse emission. We have calculated this effect by adding a Gaussian background model along the Galactic equator with a fixed width of 1° (Rho et al 2018;Albert et al 2021b) in the nested fit. We have compared the best-fit parameters of the three sources and added the differences as a systematic component.…”

Section: Systematic Uncertaintiesmentioning

confidence: 99%

HAWC Study of the Very-high-energy γ-Ray Spectrum of HAWC J1844−034

Albert,

Alvarez,

Avila Rojas

et al. 2023

ApJ

View full text Add to dashboard Cite

Recently, the region surrounding eHWC J1842−035 has been studied extensively by γ-ray observatories due to its extended emission reaching up to a few hundred TeV and potential as a hadronic accelerator. In this work, we use 1910 days of cumulative data from the High Altitude Water Cherenkov (HAWC) observatory to carry out a dedicated systematic source search of the eHWC J1842−035 region. During the search, we found three sources in the region, namely, HAWC J1844−034, HAWC J1843−032, and HAWC J1846−025. We have identified HAWC J1844−034 as the extended source that emits photons with energies up to 175 TeV. We compute the spectrum for HAWC J1844−034, and by comparing with the observational results from other experiments, we have identified HESS J1843−033, LHAASO J1843−0338, and TASG J1844−038 as very-high-energy γ-ray sources with a matching origin. Also, we present and use the multiwavelength data to fit the hadronic and leptonic particle spectra. We have identified four pulsar candidates in the nearby region in which PSR J1844−0346 is found to be the most likely candidate due to its proximity to HAWC J1844−034 and the computed energy budget. We have also found SNR G28.6−0.1 as a potential counterpart source of HAWC J1844−034 for which both leptonic and hadronic scenarios are feasible.

show abstract

Techniques for Measuring Galactic Diffuse Emission Flux and their Preliminary Results in Confused Regions

Cited by 2 publications

References 21 publications

Evidence of 200 TeV photons from HAWC J1825-134

Evidence of 200 TeV photons from HAWC J1825-134

HAWC Study of the Very-high-energy γ-Ray Spectrum of HAWC J1844−034

Contact Info

Product

Resources

About