SIMBAD references

2001A&A...370..468T - Astronomy and Astrophysics, volume 370, 468-478 (2001/5-1)

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

TORRES D.F., ROMERO G.E., COMBI J.A., BENAGLIA P., ANDERNACH H. and PUNSLY B.

Abstract (from CDS):

We present a study of 40 low-latitude unidentified 3EG gamma-ray sources which were found to be not positionally coincident with any known class of potential gamma-ray emitters in the Galaxy (Romero et al., 1999A&A...348..868R). We have performed a variability analysis which reveals that many of these 40 sources are variable. These sources have, in addition, a steep mean value of the gamma-ray spectral index, <Γ≥2.41±0.2, which, combined with the high level of variability, seems to rule out a pulsar origin. The positional coincidences with uncatalogued candidates to supernova remnants were also studied. Only 7 sources in the sample are spatially coincident with these candidates, a result that is shown to be consistent with the expected level of pure chance association. A complementary search for weak radio counterparts was also conducted and the results are presented as an extensive table containing all significant point-like radio sources within the 40 EGRET fields. We argue that in order to produce the high variability, steep gamma-ray spectra, and absence of strong radio counterparts observed in some of the gamma-ray sources of our sample, a new class of objects should be postulated, and we analyze a viable candidate.

Abstract Copyright:

Journal keyword(s): gamma-rays: observations - gamma-rays: theory - ISM: supernova remnants - black holes physics

VizieR on-line data: <Available at CDS (J/A+A/370/468): survey.dat table1.dat table5.txt table6.dat table7 .dat table8.dat>

Nomenclature: Table 4: [TRC2001] 3EG J1631-4033 SN (Nos S1-S4). Table 6: [TRC2001] LLL.l+BB.b N=101.

CDS comments: Objects 87GB : non standard format, not in Simbad.

Simbad objects: 266

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2019.09.16-19:33:28

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