1,758 research outputs found
Absorption Features in the X-ray Spectrum of an Ordinary Radio Pulsar
The vast majority of known non-accreting neutron stars (NSs) are
rotation-powered radio and/or gamma-ray pulsars. So far, their multiwavelength
spectra have all been described satisfactorily by thermal and non-thermal
continuum models, with no spectral lines. Spectral features have, however, been
found in a handful of exotic NSs and thought to be a manifestation of their
unique traits. Here we report the detection of absorption features in the X-ray
spectrum of an ordinary rotation-powered radio pulsar, J1740+1000. Our findings
bridge the gap between the spectra of pulsars and other, more exotic, NSs,
suggesting that the features are more common in the NS spectra than they have
been thought so far.Comment: 18 pages, 4 color figures, 1 Tabl
Alien Registration- Durant, Kenneth G. (Portland, Cumberland County)
https://digitalmaine.com/alien_docs/26572/thumbnail.jp
Alien Registration- Durant, Kenneth G. (Portland, Cumberland County)
https://digitalmaine.com/alien_docs/26571/thumbnail.jp
Spatial and temporal variation in otolith chemistry for tautog (Tautoga onitis) in Narragansett Bay and Rhode Island coastal ponds
The elemental composition of otoliths may provide valuable
information for establishing connectivity between fish nursery grounds and adult fish populations. Concentrations
of Rb, Mg, Ca, Mn, Sr, Na, K, Sr, Pb, and Ba were determined
by using solution-based inductively coupled plasma mass spectrometry in otoliths of young-of-the year tautog
(Tautoga onitis) captured in nursery areas along the Rhode Island coast during two consecutive years. Stable oxygen (δ18O) and carbon (δ13C) isotopic ratios in young-of-the year otoliths were also analyzed with isotope ratio mass spectrometry. Chemical signatures differed significantly
among the distinct nurseries within Narragansett Bay and the coastal ponds across years. Significant differences
were also observed within nurseries from year to year. Classification accuracy to each of the five tautog nursery areas ranged from 85% to 92% across years. Because accurate
classification of juvenile tautog nursery sites was achieved, otolith chemistry can potentially be used as
a natural habitat tag
- …