Multiwavelength constraints on the unidentified Galactic TeV sources HESS J1427$-$608, HESS J1458$-$608, and new VHE $\gamma$-ray source candidates
| hal.structure.identifier | Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG] | |
| dc.contributor.author | DEVIN, J. | |
| hal.structure.identifier | Laboratoire Univers et Particules de Montpellier [LUPM] | |
| dc.contributor.author | RENAUD, Matthieu | |
| hal.structure.identifier | Centre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG] | |
| dc.contributor.author | LEMOINE-GOUMARD, M. | |
| hal.structure.identifier | Laboratoire Univers et Particules de Montpellier [LUPM] | |
| dc.contributor.author | VASILEIADIS, George | |
| dc.date.issued | 2021 | |
| dc.identifier.issn | 0004-6361 | |
| dc.description.abstractEn | Aims. Among the γ-ray sources discovered at high and very-high energies, a large fraction still lack a clear identification. In particular, the H.E.S.S. Galactic Plane Survey (HGPS) revealed 78 TeV sources among which 47 are not clearly associated with a known object. Multiwavelength data can help identify the origin of the very-high energy γ-ray emission, although some bright TeV sources have been detected without clear counterparts. We present a multiwavelength approach to constrain the origin of the emission from unidentified HGPS sources.Methods. We present a generic pipeline that explores a large database of multiwavelength archival data toward any region in the Galactic plane. Along with a visual inspection of the retrieved multiwavelength observations to search for faint and uncataloged counterparts, we derive a radio spectral index that helps disentangle thermal from nonthermal emission and a mean magnetic field through X-ray and TeV data in case of a leptonic scenario. We also search for a spectral connection between the GeV and the TeV regimes with the Fermi-LAT cataloged sources that may be associated with the unidentified HGPS source. We complete the association procedure with catalogs of known objects (supernova remnants, pulsar wind nebulae, H II regions, etc.) and with the source catalogs from instruments whose data are retrieved.Results. The method is applied on two unidentified sources, namely HESS J1427−608 and HESS J1458−608, for which the multiwavelength constraints favor the pulsar wind nebula (PWN) scenario. We model their broadband nonthermal spectra in a leptonic scenario with a magnetic field B ≲ 10 μG, which is consistent with that obtained from ancient PWNe. We place both sources within the context of the TeV PWN population to estimate the spin-down power and the characteristic age of the putative pulsar. We also shed light on two possibly significant γ-ray excesses in the HGPS: the first is located in the south of the unidentified source HESS J1632−478 and the second is spatially coincident with the synchrotron-emitting supernova remnant G28.6−0.1. The multiwavelength counterparts found toward both γ-ray excesses make these promising candidates for being new very-high energy γ-ray sources.Key words: gamma rays: ISM / ISM: individual objects: HESS J1427-608 / cosmic rays / radio continuum: ISM / ISM: individual objects: HESS J1458-608 / ISM: supernova remnants | |
| dc.description.sponsorship | Rayons Cosmiques au PeV - ANR-17-CE31-0014 | |
| dc.language.iso | en | |
| dc.publisher | EDP Sciences | |
| dc.rights.uri | http://creativecommons.org/licenses/by/ | |
| dc.subject.en | GeV | |
| dc.subject.en | GLAST | |
| dc.subject.en | X-ray | |
| dc.subject.en | supernova | |
| dc.subject.en | thermal | |
| dc.subject.en | spectral | |
| dc.subject.en | power spectrum | |
| dc.subject.en | data management | |
| dc.subject.en | gamma ray: VHE | |
| dc.subject.en | pulsar | |
| dc.subject.en | magnetic field | |
| dc.subject.en | galaxy | |
| dc.subject.en | synchrotron | |
| dc.subject.en | TeV | |
| dc.subject.en | HESS | |
| dc.subject.en | ISM: supernova remnants | |
| dc.subject.en | ISM: individual objects: HESS J1458-608 | |
| dc.subject.en | radio continuum: ISM | |
| dc.subject.en | cosmic rays | |
| dc.subject.en | ISM: individual objects: HESS J1427-608 | |
| dc.subject.en | gamma rays: ISM | |
| dc.title.en | Multiwavelength constraints on the unidentified Galactic TeV sources HESS J1427$-$608, HESS J1458$-$608, and new VHE $\gamma$-ray source candidates | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1051/0004-6361/202039563 | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph] | |
| dc.identifier.arxiv | 2101.07775 | |
| bordeaux.journal | Astronomy and Astrophysics - A&A | |
| bordeaux.page | A68 | |
| bordeaux.volume | 647 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-03129437 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-03129437v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2021&rft.volume=647&rft.spage=A68&rft.epage=A68&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=DEVIN,%20J.&RENAUD,%20Matthieu&LEMOINE-GOUMARD,%20M.&VASILEIADIS,%20George&rft.genre=article |
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