FERMI LAT and WMAP observations of the supernova remnant HB 21

Pivato, Giovanna; Hewitt, John W.; Tibaldo, L.; Acero, F.; Ballet, J.; Brandt, T. J.; de Palma, F.; Giordano, F.; Janssen, G. H.; Jóhannesson, G.; Smith, D. A.

doi:10.1088/0004-637X/779/2/179

Title: FERMI LAT and WMAP observations of the supernova remnant HB 21

Journal Article · Wed Dec 04 00:00:00 EST 2013 · The Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/779/2/179· OSTI ID:1356546

Pivato, Giovanna ^[1]; Hewitt, John W. ^[2]; Tibaldo, L. ^[3]; Acero, F. ^[4]; Ballet, J. ^[5]; Brandt, T. J. ^[4]; de Palma, F. ^[6]; Giordano, F. ^[6]; Janssen, G. H. ^[7]; Jóhannesson, G. ^[8]; Smith, D. A. ^[9]

Univ. di Padova, Padova (Italy); Istituto Nazionale di Fisica Nucleare, Padova (Italy)
Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States); NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
Stanford Univ., Stanford, CA (United States). SLAC National Accelerator Lab.
NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States)
CEA-IRFU/CNRS/Univ. Paris Diderot, Gif sur Yvette (France)
Univ. e del Politecnico di Bari, Bari (Italy); Istituto Nazionale di Fisica Nucleare, Bari (Italy)
Univ. of Manchester, Manchester (United Kingdom)
Univ. of Iceland, Reykjavik (Iceland)
Univ. Bordeaux, Gradignan Cedex (France)

Here, 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.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1356546

Journal Information:: The Astrophysical Journal, Vol. 779, Issue 2; ISSN 0004-637X

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 22 works

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