Parallax Observations with the [ITAL]Hubble Space Telescope[/ITAL] Yield the Distance to Geminga

Caraveo, P. A.; Bignami, G. F.; Mignani, Roberto; Taff, L. G.

doi:10.1086/310012

Cited by 122 publications

(119 citation statements)

References 14 publications

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“…All these objects related to prominent pulsars and to their associated multiwavelength counterparts. Two of them are nearby sources (Geminga with d = 160 pc, Caraveo et al 1996;and Vela with d = 290 pc, Caraveo et al 2001) and feature very extended VHE emission regions (Geminga ∼2.8 • , as indicated in Abdo et al 2007, and Vela X ∼0.5 • radius, as measured by H.E.S.S. ), as can be expected for close, extended objects.…”

Section: Leptonic Scenario: Pwnmentioning

confidence: 83%

Discovery and follow-up studies of the extended, off-plane, VHE gamma-ray source HESS J1507-622

Acero¹,

Aharonian²,

Akhperjanian³

et al. 2010

A&A

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Context. The detection of gamma-rays in the very-high-energy (VHE) range (100 GeV−100 TeV) offers the possibility of studying the parent population of ultrarelativistic particles found in astrophysical sources, so it is useful for understanding the underlying astrophysical processes in nonthermal sources. Aims. The discovery of the VHE gamma-ray source HESS J1507-622 is reported and possibilities regarding its nature are investigated. Methods. The H.E.S.S. array of imaging atmospheric Cherenkov telescopes (IACTs) has a high sensitivity compared with previous instruments (∼1% of the Crab flux in 25 h observation time for a 5σ point-source detection) and has a large field of view (∼5 • in diameter). HESS J1507-622 was discovered within the ongoing H.E.S.S. survey of the inner Galaxy, and the source was also studied by means of dedicated multiwavelength observations. Results. A Galactic gamma-ray source, HESS J1507-622, located ∼3.5 • from the Galactic plane was detected with a statistical significance >9σ. Its energy spectrum is well fitted by a power law with spectral index Γ = 2.24 ± 0.16 stat ± 0.20 sys and a flux above 1 TeV of (1.5 ± 0.4 stat ± 0.3 sys ) × 10 −12 cm −2 s −1 . Possible interpretations (considering both hadronic and leptonic models) of the VHE gamma-ray emission are discussed in the absence of an obvious counterpart.

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Section: Leptonic Scenario: Pwnmentioning

confidence: 83%

Discovery and follow-up studies of the extended, off-plane, VHE gamma-ray source HESS J1507-622

Acero¹,

Aharonian²,

Akhperjanian³

et al. 2010

A&A

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“…Among this set of candidate sources we found that only the Monogem (PSR B0656+14) at a distance of d = 290 pc and age T = 1.1 × 10 5 years (Manchester et al 2005), and the Geminga pulsar (PSR J0633+1746) with d = 160 pc and T = 3.7 × 10 5 years (Caraveo et al 1996 [48]) give a significant contribution to the high energy electron and positron flux reaching the Earth. The observed spin-down luminosities of these pulsars areĖ PSD ≃ 3.8 × 10 34 erg s −1 andĖ PSD ≃ 3.2 × 10 34 erg s −1 respectively.…”

Section: Pulsar Interpretationmentioning

confidence: 90%

On possible interpretations of the high energy electron–positron spectrum measured by the Fermi Large Area Telescope

Grasso

Profumo

Strong

et al. 2009

Astroparticle Physics

253

196

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Abstract. The Fermi-LAT experiment recently reported high precision measurements of the spectrum of cosmic-ray electrons-plus-positrons (CRE) between 20 GeV and 1 TeV. The spectrum shows no prominent spectral features, and is significantly harder than that inferred from several previous experiments. We show that the interpretation of the reported data, especially when combined with other experimental results, requires changes to the standard scenario of CRE origin and propagation. Here we discuss several interpretations of the Fermi results based either on conventional Galactic cosmic ray diffusive models or by invoking additional electron-positron primary sources, e.g. nearby pulsars or particle Dark Matter annihilation. When appropriate, we account for other complementary experimental results, specifically the upper limits on the CRE flux above 600 GeV reported by H.E.S.S. and the measurement of the positron fraction reported by PAMELA between 1 and 100 GeV, as well as gamma-ray data. We find that several combinations of parameters involving both the pulsar and dark matter scenarios allow a consistent interpretation of all data sets. We also briefly discuss the possibility of discriminating between those scenarios by looking for a possible anisotropy in the CRE flux.

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“…Following a robust method successfully applied in several previous astrometric works (see e.g. Caraveo et al 1996;Caraveo & Mignani 1999;Mignani et al , 2001Caraveo et al 2001), this relies on an accurate image superposition which is obtained by optimizing a linear coordinate transformation between two reference grids determined by a set of common reference objects.…”

Section: The Data Analysismentioning

confidence: 99%

HST observations rule out the association between Cir X-1 and SNR G321.9-0.3

Mignani¹,

Luca

Caraveo

et al. 2002

A&A

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Abstract. Cir X-1 is one of the most intriguing galactic X-ray sources. It is a ∼16.6 days variable X/radio source, a type-I X-ray burster and a QPO emitter. In spite of an uncertain optical counterpart classification, all these properties identify the source as an LMXB. The morphology of the surrounding radio nebula has suggested an association with the nearby (∼25 arcmin) SNR G321.9-0.3, implying that Cir X-1 is a runaway binary originated from the supernova explosion ≈10 5 years ago. To investigate this hypothesis, we carried out a proper motion measurement of the Cir X-1 m ∼ 19 optical counterpart using a set of HST/WFC and WFPC2 observations taken ∼8.6 years apart. We obtained a 3σ upper limit of ≈5 mas yr −1 on the source proper motion. Since the runaway hypothesis would have implied a proper motion due North ranging between 15 and 75 mas yr −1 , depending on the actual age of the SNR, our result definitively rules out the association between Cir X-1 and SNR G321.9-0.3.

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Parallax Observations with the [ITAL]Hubble Space Telescope[/ITAL] Yield the Distance to Geminga

Cited by 122 publications

References 14 publications

Discovery and follow-up studies of the extended, off-plane, VHE gamma-ray source HESS J1507-622

Discovery and follow-up studies of the extended, off-plane, VHE gamma-ray source HESS J1507-622

On possible interpretations of the high energy electron–positron spectrum measured by the Fermi Large Area Telescope

HST observations rule out the association between Cir X-1 and SNR G321.9-0.3

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