89 research outputs found
A Very Large Telescope imaging and spectroscopic survey of the Wolf-Rayet population in NGC 7793
We present a VLT/FORS1 imaging and spectroscopic survey of the Wolf-Rayet
(WR) population in the Sculptor group spiral galaxy NGC 7793. We identify 74
emission line candidates from archival narrow-band imaging, from which 39 were
observed with the Multi Object Spectroscopy (MOS) mode of FORS1. 85% of these
sources displayed WR features. Additional slits were used to observe HII
regions, enabling an estimate of the metallicity gradient of NGC 7793 using
strong line calibrations, from which a central oxygen content of log (O/H) + 12
= 8.6 was obtained, falling to 8.25 at R_25. We have estimated WR populations
using a calibration of line luminosities of Large Magellanic Cloud stars,
revealing ~27 WN and ~25 WC stars from 29 sources spectroscopically observed.
Photometric properties of the remaining candidates suggest an additional ~27 WN
and ~8 WC stars. A comparison with the WR census of the LMC suggests that our
imaging survey has identified 80% of WN stars and 90% for the WC subclass.
Allowing for incompleteness, NGC 7793 hosts ~105 WR stars for which
N(WC)/N(WN)~0.5. From our spectroscopy of HII regions in NGC 7793, we revise
the global Halpha star formation rate of Kennicutt et al. upward by 50% to 0.45
M_sun/yr. This allows us to obtain N(WR)/N(O)~0.018, which is somewhat lower
than that resulting from the WR census by Schild et al. of another Sculptor
group spiral NGC 300, whose global physical properties are similar to NGC 7793.
Finally, we also report the fortuitous detection of a bright (m_V = 20.8 mag)
background quasar Q2358-32 at z~2.02 resulting from CIV 1548-51 redshifted to
the 4684 passband.Comment: 17 pages, 13 figures, accepted for MNRAS (detailed finding charts
omitted)
Identifying practical indicators of biodiversity for stand-level management of plantation forests
The initial effects of afforestation on the ground-dwelling spider fauna of Irish peatlands and grasslands
Effect of heavy metals in recycled water used for household laundry on quality of cloth and washing machine
Social determinants of duration of last nursing home stay at the end of life in Switzerland: a retrospective cohort study
âItâs not something I chose you knowâ: making sense of pedophilesâ sexual interest in children and the impact on their psychosexual identity
Sexual interest in children is one of the most strongly predictive of the known risk factors for sexual reconviction. It is an important aspect of risk assessment to identify the presence of such interest, and an important task for treatment providers to address such a sexual interest where it is present. It has been argued that understanding pedophilesâ deviant sexual interest in children can enhance risk assessment, management, and treatment planning. This research study aims to explore the phenomenology of deviant sexual interest in children, the impact it has on pedophilic offendersâ identities, and their views on the treatability of that interest. The study used semistructured interviews and repertory grids to make sense of participantsâ experiences. The results revealed three superordinate themes: ââlivingâ with a deviant sexual interest,â ârelational sexual self,â and âpossible and feared sexual self.â The analysis unpacks these themes and repertory grid analysis is used to explore a subset of participantsâ identities in more detail. The results reveal that there needs to be an acceptance from both client and therapist that their sexual interest in children may never go away. Through this acceptance, clients could work on enhancing sexual self-regulation, recognizing their triggers, and so managing their sexual thoughts, feelings, and behavior. Implications for treatment are also discussed
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