Observing two dark accelerators around the Galactic Centre with<i>Fermi</i>Large Area Telescope

Hui, C. Y.; Yeung, Paul K. H.; Ng, C. W.; Lin, L. C.-C.; Tam, P. H. T.; Cheng, K. S.; Kong, Albert; Chernyshov, Dmitry; Dogiel, V. A.

doi:10.1093/mnras/stw209

Cited by 12 publications

(9 citation statements)

References 25 publications

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“…The others seem to be confused or contaminated by the diffuse background in complex regions: FGES J1745.8−3028 in the Galactic center region (see Hui et al 2016, for a detailed analysis of this complex region), FGES J1036.3J1036.3−5834 in the region of Westerlund 2, FGES J1109.4−6115 in the region of MSH 11−62, FGES J1409. 1−6121, FGES J1553.8−5325, FGES J1633.0-4746, FGES J1652.2−4633, and FGES J1655.6−4738.…”

Section: New Extended Sourcesmentioning

confidence: 99%

Search for Extended Sources in the Galactic Plane Using Six Years of Fermi-Large Area Telescope Pass 8 Data above 10 GeV

Ackermann

Ajello

Baldini

et al. 2017

ApJ

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The spatial extension of a γ-ray source is an essential ingredient to determine its spectral properties, as well as its potential multiwavelength counterpart. The capability to spatially resolve γ-ray sources is greatly improved by the newly delivered Fermi-Large Area Telescope (LAT) Pass 8 event-level analysis, which provides a greater acceptance and an improved point-spread function, two crucial factors for the detection of extended sources. Here, we present a complete search for extended sources located within 7°from the Galactic plane, using 6 yr of Fermi-LAT data above 10 GeV. We find 46 extended sources and provide their morphological and spectral characteristics. This constitutes the first catalog of hard Fermi-LAT extended sources, named the Fermi Galactic Extended Source Catalog, which allows a thorough study of the properties of the Galactic plane in the sub-TeV domain.

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Section: New Extended Sourcesmentioning

confidence: 99%

Search for Extended Sources in the Galactic Plane Using Six Years of Fermi-Large Area Telescope Pass 8 Data above 10 GeV

Ackermann

Ajello

Baldini

et al. 2017

ApJ

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“…In the GeV band, more than seven years survey data from the Fermi Large Area Telescope (Fermi-LAT) provides a good opportunity to hunt for the unidentified VHE sources. Indeed, several unidentified VHE sources have been detected with the Fermi-LAT data (Hui et al 2016).…”

Section: Introductionmentioning

confidence: 99%

HESS J1427−608: AN UNUSUAL HARD, UNBROKEN Γ-Ray SPECTRUM IN a VERY WIDE ENERGY RANGE

Guo

Xin

Liao

et al. 2017

ApJ

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We report the detection of a GeV γ-ray source which is spatially overlapping and thus very likely associated with the unidentified very-high-energy (VHE) γ-ray source HESS J1427-608 with the Pass 8 data recorded by the Fermi Large Area Telescope. The photon spectrum of this source is best described by a power-law with an index of 1.85 ± 0.17 in the energy range of 3 − 500 GeV, and the measured flux connects smoothly with that of HESS J1427-608 at a few hundred GeV. This source shows no significant extension and time variation. The broadband GeV-TeV emission over four decades of energies can be well fitted by a single power-law function with an index of 2.0, without obvious indication of spectral cutoff toward high energies. Such a result implies that HESS J1427-608 may be a PeV particle accelerator. We discuss possible nature of HESS J1427-608 according to the multi-wavelength spectral fittings. Given the relatively large errors, either a leptonic or a hadronic model can explain the multi-wavelength data from radio to VHE γ-rays. The inferred magnetic field strength is a few µG, which is smaller than typical values of supernova remnants (SNRs), and is consistent with some pulsar wind nebulae (PWNe). On the other hand, the flat γ-ray spectrum is slightly different from typical PWNe but similar to that of some known SNRs.

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“…Although the lack of a spectral break in HESS J1745-303 is not compatible with many other GeV-SNRs (Acero et al 2015), the total energy of cosmic-ray protons accelerated in G359.1-0.5 can produce the observed the TeV emission (e.g. Hui et al 2016). Therefore, several previous works have tried to explain HESS J1745-303 in terms of the SNR through the hadronic mechanism.…”

Section: Comparison Between Co Distribution and Emission At γ-Raysmentioning

confidence: 93%

“…This extended TeV complex has been described as consisting of three components (Aharonian et al 2008). There is growing evidence that region A, the component closer to G359.1-0.5, is unrelated to the other two components (Hui et al 2011(Hui et al , 2016de Wilt et al 2017), hence we will focus only on this one. In Fig.…”

Section: Comparison Between Co Distribution and Emission At γ-Raysmentioning

confidence: 99%

Molecular environments of the supernova remnant G359.1−0.5

Eppens

Reynoso

Lazendic-Galloway

et al. 2020

Monthly Notices of the Royal Astronomical Society

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We report new CO observations and a detailed molecular-line study of the mixed morphology (MM) supernova remnant (SNR) G359.1-0.5, which contains six OH (1720 MHz) masers along the radio shell, indicative of shock-cloud interaction. Observations of 12 CO and 13 CO J:1-0 lines were performed in a ∼ 38 ′ × 38 ′ -area with the on-the-fly technique using the Kit Peak 12 Meter telescope. The molecular study has revealed the existence of a few clumps with densities ∼ 10 3 cm −3 compatible in velocity and position with the OH (1720 MHz) masers. These clumps, in turn, appear to be part of a larger, elongated molecular structure ∼ 34 ′ long extending between −12.48 and +1.83 km s −1 , adjacent to the western edge of the radio shell. According to the densities and relative position with respect to the masers, we conclude that the CO clouds depict unshocked gas, as observed in other remnants with OH (1720 MHz) masers. In addition, we investigated the distribution of the molecular gas towards the adjacent γ-ray source HESS J1745-303 but could not find any morphological correlation between the γ-rays and the CO emission at any velocity in this region.

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Observing two dark accelerators around the Galactic Centre withFermiLarge Area Telescope

Abstract: We report the results from a detailed γ−ray investigation in the field of two

Cited by 12 publications

References 25 publications

Search for Extended Sources in the Galactic Plane Using Six Years of Fermi-Large Area Telescope Pass 8 Data above 10 GeV

Search for Extended Sources in the Galactic Plane Using Six Years of Fermi-Large Area Telescope Pass 8 Data above 10 GeV

HESS J1427−608: AN UNUSUAL HARD, UNBROKEN Γ-Ray SPECTRUM IN a VERY WIDE ENERGY RANGE

Molecular environments of the supernova remnant G359.1−0.5

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