A variability analysis of low-latitude unidentified gamma-ray sources

Torres, D. F.; Romero, Gustavo E.; Combi, J. A.; Benaglia, P.; Andernach, H.; Punsly, Brian

doi:10.1051/0004-6361:20010239

Cited by 86 publications

(86 citation statements)

References 38 publications

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“…The possibly variable source (Torres et al 2001b) 3EG J1824Ϫ1514 has been proposed to be the result of inverse Compton emission from a microquasar (Paredes et al 2000). Although there are (considering all catalogs) three pulsars coincident with this source, none pose a challenge to the microquasar interpretation.…”

Section: Positional Coincidencesmentioning

confidence: 99%

Possible New γ-Ray Pulsar Detections by the [ITAL]AGILE[/ITAL] and [ITAL]GLAST[/ITAL] Missions: An Outer Gap Model Look at the Parkes Pulsar Catalog

Torres

Nuza²

2003

The Astrophysical Journal

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The predictive power of the outer gap model of high-energy emission from pulsars is used to analyze the Parkes multibeam pulsar survey. We find that most of the radio pulsars of the Parkes catalog are not g-ray emitters according to the outer gap model. The sample of possible new g-ray pulsar detections by AGILE and GLAST is given. That includes 13 new excellent candidates. Four new positional coincidences between EGRET detections and Parkes pulsars are found, for which we discard a physical association. The consequences of applying a new electron density model for assigning the pulsar distances are explored. The new model systematically reduces the distances to the pulsars (corrections can be as large as 90%), increasing their fluxes and affecting the detection prospects.

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Section: Positional Coincidencesmentioning

confidence: 99%

Possible New γ-Ray Pulsar Detections by the [ITAL]AGILE[/ITAL] and [ITAL]GLAST[/ITAL] Missions: An Outer Gap Model Look at the Parkes Pulsar Catalog

Torres

Nuza²

2003

The Astrophysical Journal

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“…These low-latitude sources show a highly variable flux, a soft γ-ray spectrum, and do not spatially coincide with any known potential γ-ray emitters (Torres et al 2001a). Torres et al (2001a) suggest that isolated Kerr-Newman black holes could be the objects behind. One of them, 3EG J1828+0142, was modeled by Punsly et al (2000) based on that theory.…”

Section: Discussionmentioning

confidence: 89%

“…Zhang et al 2000;Torres et al 2001a) to normalize the measured variability to the measured variability of sources, which are considered to be non-variable. To do so, we calculated the so-called I variability index (for definition and details see Zhang et al 2000, andTorres et al 2001a)…”

Section: Variabilitymentioning

confidence: 99%

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An unidentified variable gamma-ray source near the galactic plane detected by COMPTEL

Zhang

Collmar

Schönfelder

2002

A&A

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Abstract. We report the detection of an unidentified γ-ray source near the Galactic plane by the COMPTEL experiment aboard the Compton Gamma-Ray Observatory. The source is detected at a significance level of ∼7.2σ in the energy range 1-3 MeV and at ∼4.6σ in the lower 0.75-1 MeV band in the time period March to July 1995. At energies above 3 MeV are only marginal hints or upper limits obtained. The MeV spectrum has a soft shape. Strong flux variability is found within one year at energies below 3 MeV. Possible counterparts of galactic and extragalactic nature are discussed.

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“…3EG J1828+0142 is the second most variable low galactic latitude non-transient gamma-ray source in the list of variable EGRET sources of Torres et al (2001), considered also very variable by Nolan et al (2003). The EGRET photon index is Γ ∼ 2.7 ± 0.4, with an average flux ∼4 × 10 −11 erg s −1 cm −2 .…”

Section: Eg J1828+0142mentioning

confidence: 99%

A microquasar model applied to unidentified gamma-ray sources

Bosch‐Ramon¹,

Paredes²,

Romero

et al. 2006

A&A

Self Cite

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Among unidentified gamma-ray sources in the galactic plane, there are some that present significant variability and have been proposed to be high-mass microquasars. To deepen the study of the possible association between variable low galactic latitude gamma-ray sources and microquasars, we have applied a leptonic jet model based on the microquasar scenario that reproduces the gamma-ray spectrum of three unidentified gamma-ray sources, 3EG J1735−1500, 3EG J1828+0142 and GRO J1411−64, and is consistent with the observational constraints at lower energies. We conclude that if these sources were generated by microquasars, the particle acceleration processes could not be as efficient as in other objects of this type that present harder gamma-ray spectra. Moreover, the dominant mechanism of high-energy emission should be synchrotron self-Compton (SSC) scattering, and the radio jets may only be observed at low frequencies. For each particular case, further predictions of jet physical conditions and variability generation mechanisms have been made in the context of the model. Although there might be other candidates able to explain the emission coming from these sources, microquasars cannot be excluded as counterparts. Observations performed by the next generation of gamma-ray instruments, like GLAST, are required to test the proposed model.

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A variability analysis of low-latitude unidentified gamma-ray sources

Cited by 86 publications

References 38 publications

Possible New γ-Ray Pulsar Detections by the [ITAL]AGILE[/ITAL] and [ITAL]GLAST[/ITAL] Missions: An Outer Gap Model Look at the Parkes Pulsar Catalog

Possible New γ-Ray Pulsar Detections by the [ITAL]AGILE[/ITAL] and [ITAL]GLAST[/ITAL] Missions: An Outer Gap Model Look at the Parkes Pulsar Catalog

An unidentified variable gamma-ray source near the galactic plane detected by COMPTEL

A microquasar model applied to unidentified gamma-ray sources

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