1,721,221 research outputs found
Massive neutrinos in particle physics and their astrophysical and cosmological implications.
No full textThe authors review the basic properties of massive neutrinos in the framework of the unified gauge theories of strong and electromagnetic interactions, and their consequences for astrophysical and cosmological phenomena
A review of the genus Thorectes in the Himalayan Region, with description of a new species from Uttar Pradesh, India (Coleoptera, Geotrupidae)
No full textThorectes shankara specie nova from West Himalayas is described and illustrated. A checklist of the Himalayan species of Thorectes is given, including detailed records. A key to these species is provided and their diagnostic characters are summarized. Metathoracic wings are strongly but not completely reduced in these species. The wing reduction in Thorectes is discussed.
Key-words: Taxonomy, wing size, highlands, Himalayan faun
A taxonomic overview of the genus Pseudoathyreus Howden and Martinez, and redescription of two related species from southern Africa (Coleoptera, Geotrupidae, Bolboceratinae)
No full text
Somalobolbus benadirensis, a new genus and new species of Bolboceratinae from Somalia (Coleoptera, Scarabaeoidea, Geotrupidae)
No full textA new species of the genus Odonteus (Coleoptera: Geotrupidae) from Northern Pakistan
No full textA remarkable new species, Odonteus gandhara Carpaneto & Mignani, n. sp., is described from
northern Pakistan. The holotype (adult male) and the paratype (adult female) are illustrated and
compared with O. armiger (Scopoli, 1772) and O. orientalis Mittal, 1998, the only two species of
this genus recognized in the Old World. Both O. armiger and O. orientalis have the eye not completely
divided by the canthus and have a sensory area on the external side of the last antennomere
(this character has never been discussed in the literature until now). These two character states in O.
armiger and O. orientalis compel emendations to the definition of the genus. The new species has a
great zoogeographical relevance because similar species occur in North America (O. obesus
LeConte, 1859 and O. falli Wallis, 1928), and probably represents a relict species endemic to the
Himalayan range.
Key words: Odonteus, systematics, new species, zoogeography, Pakistan, Himalayan range, Palearctic
Regio
New VLT observations of the fermi pulsar PSR J1048-5832×
No full textPSR J1048-5832 is a Vela-like (P = 123.6 ms; τ ~ 20.3 kyr) γ-ray pulsar detected by Fermi, at a distance of ~2.7 kpc and with a rotational energy loss rate ESD ~ 2 × 1036 erg s-1. The PSR J1048-5832 field has been observed with the Very Large Telescope (VLT) in the V and R bands. We used these data to determine the colour of the object detected closest to the Chandra position (Star D) and to confirm that it is not associated with the pulsar. For the estimated extinction along the line of sight, inferred from a re-analysis of the Chandra and XMM- Newton spectra, the fluxes of Star D (V ~ 26.7; R ~ 25.8) imply a -0.13 ≲ (V-R)0 ≲ 0.6. This means that the PSR J1048-5832 spectrum would be unusually red compared to the Vela pulsar. Moreover, the ratio between the unabsorbed optical and X-ray flux of PSR J1048-5832 would be much higher than for other young pulsars. Thus, we conclude that Star D is not the PSR J1048-5832 counterpart. We compared the derived R- and V-band upper limits (R ≳ 26.4; V ≳ 27.6) with the extrapolation of the X-ray and γ-ray spectra and constrained the pulsar spectrum at low energies. In particular, the VLT upper limits suggest that the pulsar spectrum could be consistent with a single power law, stretching from the γ rays to the optical. © 2012 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
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