BhaBAR: Big Halpha kinematical sample of BARred spiral galaxies - I. Fabry-Perot Observations of 21 galaxies

The Halpha gas kinematics of twenty-one representative barred spiral galaxies belonging to the BHaBAR sample is presented. The galaxies were observed with FaNTOmM, a Fabry-Perot integral-field spectrometer, on three different telescopes. The 3D data cubes were processed through a robust pipeline with the aim of providing the most homogeneous and accurate dataset possible useful for further analysis. The data cubes were spatially binned to a constant signal-to-noise ratio, typically around 7. Maps of the monochromatic Halpha emission line and of the velocity field were generated and the kinematical parameters were derived for the whole sample using tilted-ring models. The photometrical and kinematical parameters (position angle of the major axis, inclination, systemic velocity and kinematical centre) are in relative good agreement, except maybe for the later-type spirals.Comment: 34 pages, 25 figures, accepted for publication in MNRAS. To obtain a higher resolution version, go to ftp://ftp.astro.umontreal.ca/outgoing/olivier/bhabar.pdf or to http://www.astro.umontreal.ca/fantomm/bhabar

Application des connaissances scientifiques en prévention du suicide : Vérification d’une stratégie fondée sur la communauté de pratique

Cet article a pour objectif de décrire une expérience pilote fondée sur les principes d’action des communautés de pratique (CoP), afin de rapprocher chercheurs et milieux de pratique en prévention du suicide et favoriser une meilleure utilisation des connaissances scientifiques. Des professionnels (n = 15) de différents organismes concernés par la prévention du suicide au Québec et disséminés sur tout le territoire (Centres de prévention du suicide, centres jeunesse, direction de santé publique, milieux hospitaliers), ainsi que des chercheurs (n = 4) et un animateur de la communauté ont participé à cette expérience innovante. La CoP a permis d’obtenir des effets sur la réceptivité envers les connaissances, l’accès aux ressources et aux connaissances et le développement de collaboration entre les membres. Des conditions préalables semblent cependant nécessaires à des collaborations accrues entre recherche et pratique, notamment un rapprochement sur le plan des valeurs et une relation fondée sur la confiance et le respect de l’autre et la capacité d’investir du temps dans le développement de relations de travail.The objective of this article is to describe a pilot experiment based on community of practice (CoP) action principles and aimed at bridging the gap between suicide prevention researchers and practitioners and encouraging better utilization of research knowledge. Participants in this innovative experiment included professionals (n = 15) from a variety of Quebec organizations concerned with suicide prevention located throughout the province (suicide prevention centers, youth centers, public health department, hospital settings), researchers (n = 4) and one community animator. The CoP made it possible to obtain effects on receptivity to knowledge, access to resources and knowledge, and the development of collaboration between members. However, it would appear that certain preconditions are necessary for increased collaboration between researchers and practitioners, notably the development of greater common ground in terms of values and a relationship based on trust and mutual respect and the ability to invest time in the development of work relations

On the relevance of the Tremaine-Weinberg method applied to H-alpha velocity field.Pattern speeds determination in M100 (NGC 4321)

The relevance of the Tremaine-Weinberg (TW) method is tested to measure the bar, spiral and inner structure pattern speeds using a gaseous velocity field. The TW method is applied to various simulated barred galaxies in order to demonstrate its validity in seven different configurations, including star formation or/and dark matter halo. The reliability of the different physical processes involved and of the various observational parameters are also tested. The simulations show that the TW method could be applied to the gaseous velocity fields to get a good estimate of the bar pattern speed, under the condition that regions of shocks are avoided and measurements are confined to regions where the gaseous bar is well formed. We successfully apply the TW method to the \ha velocity field of the Virgo Cluster Galaxy M100 (NGC 4321) and derive pattern speeds of 55+/-5 km/s/kpc for the nuclear structure, 30+/-2 km/s/kpc for the bar and 20+/-1 km/s/kpc for the spiral pattern, in full agreement with published determinations using the same method or alternative ones.Comment: 29 pages, 8 figures, accepted for publication in ApJ. To obtain a higher resolution version, visit to http://www.astro.umontreal.ca/fantomm/bhabar

The Evolving Role of Faculty: Traditional Scholarship, Instructional Scholarship and Service Scholarship

Faculty workload decisions made by a departmental unit often create a conflict for faculty because promotion/tenure decisions usually focus primarily on individual scholarly achievements. This paper describes an approach to faculty evaluation that considers both departmental and individual needs by expanding the view of scholarship to include Research, Instruction, and Service

1-Methyl-1-azonia-3,5-diaza-7-phospha­tricyclo­[3.3.1.1]decane 7-oxide triiodide

The title compound, C7H15N3OP+·I3 −, is a derivative of the well known water-soluble amino­phosphine 1,3,5-triaza-7-phosphaadamantane (PTA). The crystal structure is composed of a cage-like 1-methyl-1-azonia-3,5-diaza-7-phospha­tricyclo­[3.3.1.1]decane 7-oxide cation and a triiodide anion. The N-methyl­ation of the PTA cage results in a slight elongation of the corresponding C—N bonds, while the oxidation of the P atom leads to a slight shortening of the C—P bonds in comparison with those of PTA. In general, most of the bonding parameters are comparable with those reported for related compounds bearing the PTA core. Two inter­molecular C—H⋯O hydrogen bonds between methyl­ene groups and the P=O group are responsible for the linkage of neighbouring cations into linear one-dimensional hydrogen-bonded chains

Automatic Detection of Expanding HI Shells Using Artificial Neural Networks

The identification of expanding HI shells is difficult because of their variable morphological characteristics. The detection of HI bubbles on a global scale therefore never has been attempted. In this paper, an automatic detector for expanding HI shells is presented. The detection is based on the more stable dynamical characteristics of expanding shells and is performed in two stages. The first one is the recognition of the dynamical signature of an expanding bubble in the velocity spectra, based on the classification of an artificial neural network. The pixels associated with these recognized spectra are identified on each velocity channel. The second stage consists in looking for concentrations of those pixels that were firstly pointed out, and to decide if they are potential detections by morphological and 21-cm emission variation considerations. Two test bubbles are correctly detected and a potentially new case of shell that is visually very convincing is discovered. About 0.6% of the surveyed pixels are identified as part of a bubble. These may be false detections, but still constitute regions of space with high probability of finding an expanding shell. The subsequent search field is thus significantly reduced. We intend to conduct in the near future a large scale HI shells detection over the Perseus Arm using our detector.Comment: 39 pages, 11 figures, accepted by PAS

H-alpha Kinematics of the SINGS Nearby Galaxies Survey. I

This is the first part of an Halpha kinematics follow-up survey of the SINGS sample. The data for 28 galaxies are presented. The observations were done on three different telescopes with FaNTOmM, an integral field photon counting spectrometer, installed in the respective focal reducer of each telescope. The data reduction was done through a newly built pipeline with the aim of producing the most homogenous data set possible. Adaptive spatial binning was applied to the data cubes in order to get a constant signal-to-noise ratio across the field of view. Radial velocity and monochromatic maps were generated using a new algorithm and the kinematical parameters were derived using tilted-ring models.Comment: 47 pages, 37 figures, accepted for publication in MNRAS. All high-res. figures are available at http://www.astro.umontreal.ca/fantomm/sings . An high-res. version of the article is available at http://www.astro.umontreal.ca/~odaigle/SINGS.pd

1-Methyl-1-azonia-3,5-diaza-7-phosphatricyclo­[3.3.1.13,7]decane tetra­fluoro­borate

The title compound, C7H15N3P+·BF4 − or [PTA-Me][BF4], is the N-methyl­ated derivative of the well known water-soluble amino­phosphine 1,3,5-triaza-7-phosphaadamantane (PTA). The asymmetric unit consists of a cage-like cation [PTA-Me]+ and a disordered tetra­fluoro­borate anion; two F atoms are disordered equally over two sites. A network of weak inter­molecular C—H⋯F hydrogen bonds results in a three-dimensional supra­molecular assembly

Improved 3D Fabry-Perot Data Reduction Techniques

Improved data reduction techniques for 3D data cubes obtained from Fabry-Perot integral field spectroscopy are presented. They provide accurate sky emission subtraction and adaptive spatial binning and smoothing. They help avoiding the effect analogous to the beam smearing, seen in HI radio data, when strong smoothing is applied to 3D data in order to get the most extended signal coverage. The data reduction techniques presented in this paper allow one to get the best of both worlds: high spatial resolution in high signal-to-noise regions and large spatial coverage in low signal-to-noise regions.Comment: 10 pages, 9 figures, accepted for publication in MNRA

Experimental evidence of a natural parity state in 26^{26}Mg and its impact to the production of neutrons for the s process

We have studied natural parity states in $^{26}$Mg via the $^{22}$Ne($^{6}$Li,d)$^{26}$Mg reaction. Our method significantly improves the energy resolution of previous experiments and, as a result, we report the observation of a natural parity state in $^{26}$Mg. Possible spin-parity assignments are suggested on the basis of published $\gamma$-ray decay experiments. The stellar rate of the $^{22}$Ne($\alpha$,$\gamma$)$^{26}$Mg reaction is reduced and may give rise to an increase in the production of s-process neutrons via the $^{22}$Ne($\alpha$,n)$^{25}$Mg reaction.Comment: Published in PR