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FERMI LAT AND WMAP OBSERVATIONS OF THE SUPERNOVA REMNANT HB 21
| dc.contributor.author | PIVATO, G. | |
| dc.contributor.author | W. HEWITT, J. | |
| dc.contributor.author | TIBALDO, L. | |
| hal.structure.identifier | Laboratoire Univers et Particules de Montpellier [LUPM] | |
| dc.contributor.author | ACERO, Fabio | |
| hal.structure.identifier | Astrophysique Interprétation Modélisation [AIM (UMR7158 / UMR_E_9005 / UM_112)] | |
| dc.contributor.author | BALLET, Jean | |
| hal.structure.identifier | Institut de recherche en astrophysique et planétologie [IRAP] | |
| dc.contributor.author | J. BRANDT, T. | |
| dc.contributor.author | DE PALMA, F. | |
| dc.contributor.author | GIORDANO, F. | |
| dc.contributor.author | H. JANSSEN, G. | |
| dc.contributor.author | JÓHANNESSON, G. | |
| hal.structure.identifier | Astroparticules [ASTRO] | |
| dc.contributor.author | SMITH, David Stanley | |
| dc.date.issued | 2013 | |
| dc.identifier.issn | 0004-637X | |
| dc.description.abstractEn | We present the analysis of Fermi Large Area Telescope γ-ray observations of HB 21 (G89.0+4.7). We detect significant γ-ray emission associated with the remnant: the flux >100 MeV is 9.4 ± 0.8 (stat) ± 1.6 (syst) × 10-11 erg cm-2 s-1. HB 21 is well modeled by a uniform disk centered at l = 88fdg75 ± 0fdg04, b = +4fdg65 ± 0fdg06 with a radius of 1fdg19 ± 0fdg06. The γ-ray spectrum shows clear evidence of curvature, suggesting a cutoff or break in the underlying particle population at an energy of a few GeV. We complement γ-ray observations with the analysis of the WMAP 7 yr data from 23 to 93 GHz, achieving the first detection of HB 21 at these frequencies. In combination with archival radio data, the radio spectrum shows a spectral break, which helps to constrain the relativistic electron spectrum, and, in turn, parameters of simple non-thermal radiation models. In one-zone models multiwavelength data favor the origin of γ rays from nucleon-nucleon collisions. A single population of electrons cannot produce both γ rays through bremsstrahlung and radio emission through synchrotron radiation. A predominantly inverse-Compton origin of the γ-ray emission is disfavored because it requires lower interstellar densities than are inferred for HB 21. In the hadronic-dominated scenarios, accelerated nuclei contribute a total energy of ~3 × 1049 erg, while, in a two-zone bremsstrahlung-dominated scenario, the total energy in accelerated particles is ~1 × 1049 erg. | |
| dc.language.iso | en | |
| dc.publisher | American Astronomical Society | |
| dc.subject.en | acceleration of particles | |
| dc.subject.en | cosmic rays | |
| dc.subject.en | ISM: individual objects (HB 21) | |
| dc.subject.en | radiation mechanisms: non-thermal | |
| dc.title.en | FERMI LAT AND WMAP OBSERVATIONS OF THE SUPERNOVA REMNANT HB 21 | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1088/0004-637X/779/2/179 | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph]/Phénomènes cosmiques de haute energie [astro-ph.HE] | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Phénomènes cosmiques de haute energie [astro-ph.HE] | |
| dc.identifier.arxiv | 1311.0393 | |
| bordeaux.journal | The Astrophysical Journal | |
| bordeaux.page | 2 | |
| bordeaux.volume | 779 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | in2p3-00935224 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Non spécifiée | |
| hal.origin.link | https://hal.archives-ouvertes.fr//in2p3-00935224v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=The%20Astrophysical%20Journal&rft.date=2013&rft.volume=779&rft.spage=2&rft.epage=2&rft.eissn=0004-637X&rft.issn=0004-637X&rft.au=PIVATO,%20G.&W.%20HEWITT,%20J.&TIBALDO,%20L.&ACERO,%20Fabio&BALLET,%20Jean&rft.genre=article |
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