8 research outputs found
Properties of the Young Milky Way Globular Cluster Whiting 1 from Near-Infrared Photometry
Whiting 1 is a member of the fast-growing group of young globular clusters in
the Milky Way halo. Preliminary estimates of its fundamental parameters have
been provided using optical photometry and low resolution spectroscopy. In an
attempt to strengthen our knowledge of Whiting 1, in this study we employ a
complementary approach. Isochrone fitting method was applied on the
Near-Infrared Color-Magnitude Diagram and yields an age t=5.70.3 Gyr,
metallicity =0.0060.001 ([Fe/H]=0.50.1) and distance modulus
=17.480.10. Our results confirm that Whiting 1 is a young and
moderately metal-rich globular cluster. It is one of the youngest from the Sgr
dSph. We fitted an Elson, Fall and Freeman (EFF) profile to the near-infrared
number counts, and measured cluster core radius
=9.13.9. Two probable eclipsing
variables in the cluster were found from multi-epoch band photometry.
Finally, an unknown galaxy cluster was identified on our vs.
color-magnitude diagram. It has a redshift z1, and it is located at about
1 from the center of Whiting 1 at , ,
contaminating the cluster photometry.Comment: Accepted for publication in MNRAS, 6 pages, 8 figure
Intranight variability of 3C 454.3 during its 2010 November outburst
Context. 3C 454.3 is a very active flat spectrum radio quasar (blazar) that
has undergone a recent outburst in all observed bands, including the optical.
Aims. In this work we explore the short-term optical variability of 3C 454.3
during its outburst by searching for time delays between different optical
bands. Finding one would be important for understanding the evolution of the
spectrum of the relativistic electrons, which generate the synchrotron jet
emission.
Methods. We performed photometric monitoring of the object by repeating
exposures in different optical bands (BVRI). Occasionally, different telescopes
were used to monitor the object in the same band to verify the reliability of
the smallest variations we observed.
Results. Except on one occasion, where we found indications of a lag of the
blue wavelengths behind the red ones, the results are inconclusive for most of
the other cases. There were either no structures in the light curves to be able
to search for patterns, or else different approaches led to different
conclusions.Comment: 4 pages, 4 figures. Accepted for publication in A&
Trauma informed interventions to reduce seclusion, restraint and restrictive practices amongst staff caring for children and adolescents with challenging behaviours : a systematic review
Engaging with children and adolescents in mental health settings who are exhibiting behaviours that challenge can often result in the use of seclusion, restraint and coercive practices. It is recognised that more therapeutic ways to engage this population are needed, adopting trauma informed interventions may provide a solution. The aim of this systematic review is to synthesize the evidence in relation to the effect of trauma-informed interventions on coercive practices in child and adolescent residential settings. The review is guided by elements of the Cochrane Handbook for Systematic Reviews of Interventions and reported using the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) checklist. Results were synthesized and reported narratively. Nine studies met the eligibility criteria for this review. There was a lack of homogeneity amongst the studies. The trauma-informed interventions used were typically multi-faceted, underpinned by a variety of approaches and sought to bring about changes to clinical practice. Most studies (n = 8) reported significant reductions in the use of restrictive practices following the implementation of a trauma informed approach. The use of a trauma-informed approach, underpinned by an organisational change or implementation strategy, have the potential to reduce coercive practices with children and adolescents. However, the included interventions were insufficiently described to draw strong conclusions.PeerReviewe