The Educational Green: Researching Ways of Combining Professions

The Educational Green was an innovative 3rd year design studio held in 2007 in the faculty of Architecture, Building and Planning at the University of Melbourne. The studio both informed and was informed by the authors’ involvement in a Research Council (RC) grant (ongoing 2007-2010). It involved collaboration between university staff and students, a teacher educator and staff and students at a local secondary school as a case study and the studio leader wished to experiment with her teaching, evaluate it and respond to her evaluation immediately. Keywords: School Design; Environmentally Responsible; Sustainability</p

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The UV spectra of NLS1s - Implications for their broad line regions

We study the UV spectra of NLS1 galaxies and compare them with typical Seyfert 1 galaxies and quasars. The NLS1 spectra show narrower UV lines as well as weaker CIV lambda 1549 and CIII] lambda 1909 emission. We show that these line properties are due to a lower ionization parameter and somewhat higher BLR cloud densities. These modified conditions can be explained by the hotter big blue bumps observed in NLS1s, which are in turn due to higher L/L_Edd ratios, as shown by our accretion disk and corona modeling of the NLS1 continua. We also present evidence that the Boroson & Green eigenvector 1, which is correlated with the optical and UV emission-line properties, is not driven by orientation and hence NLS1s, which have extreme eigenvector 1 values, are not viewed from an extreme viewing angle.Comment: Contributed talk presented at the Joint MPE,AIP,ESO workshop on NLS1s, Bad Honnef, Dec. 1999, to appear in New Astronomy Reviews; also available at http://wave.xray.mpe.mpg.de/conferences/nls1-worksho

Frictorq, tribómetro para avaliação objectiva de superfícies texteis

Muitos materiais têxteis, senão mesmo a sua grande maioria, são usados ou então em contacto com o ser humano. são inumeras as aplicações em que os materiais estão em contacto com o corpo e as mãos, como é o caso do vestuário e dos têxteis lar, e mesmo os têxtais técnicos em algumas aplicações especiais, entre outras. O conceito de vestuário, assim visto como a nossa segunda pele, está intimamente relacionado com enorme variedade de tecidos, que surgem, naturalmente, em função das exigencias e das voluções da moda. neste sentido, e com especial ênfase no vestuário, existem vários parâmetros que permitem avaliar a qualidade e a aplicabilidade de tecidos. o coeficiente de atrito é um desses parâmetros, sendo um dos principais indicadores para avaliação objectiva de um conceito vulgarmente conhecido por toque. Este artigo pretende rever os principais desenvolvimentos que conduziram à concepção, construção e aperfeiçoamento de um aparelho para a medição do coeficiente de atrito de tecidos, que fosse de utilização simples, preciso e com um custo aceitável. de acordo com os ultimos desenvolvimentos, também aqui analisados e discutidos, é possivel concluir que o protótipo concebido é preciso e fiável, mostrando os resultados obtidos um comportamento comparável com outro instrumento com reconhecimento mundial, o sistema japonês Kes(Kawabata Evaluation System

The first VLBI image of an Infrared-Faint Radio Source

Context: To investigate the joint evolution of active galactic nuclei and star formation in the Universe. Aims: In the 1.4 GHz survey with the Australia Telescope Compact Array of the Chandra Deep Field South and the European Large Area ISO Survey - S1 we have identified a class of objects which are strong in the radio but have no detectable infrared and optical counterparts. This class has been called Infrared-Faint Radio Sources, or IFRS. 53 sources out of 2002 have been classified as IFRS. It is not known what these objects are. Methods: To address the many possible explanations as to what the nature of these objects is we have observed four sources with the Australian Long Baseline Array. Results: We have detected and imaged one of the four sources observed. Assuming that the source is at a high redshift, we find its properties in agreement with properties of Compact Steep Spectrum sources. However, due to the lack of optical and infrared data the constraints are not particularly strong.Comment: Accepted for publication in Astronomy and Astrophysics, 5 pages, needs aa.cl

The origin of the infrared emission in radio galaxies II: analysis of mid- to far-infrared Spitzer observations of the 2Jy sample

We present an analysis of deep mid- to far-infrared (MFIR) Spitzer photometric observations of the southern 2Jy sample of powerful radio sources (0.05 < z < 0.7), conducting a statistical investigation of the links between radio jet, AGN, starburst activity and MFIR properties. This is part of an ongoing extensive study of powerful radio galaxies that benefits from both complete optical emission line information and a uniquely high detection rate in the far-infrared (far-IR). We find tight correlations between the MFIR and [OIII] emission luminosities, which are significantly better than those between MFIR and extended radio luminosities, or between radio and [OIII] luminosities. Since [OIII] is a known indicator of intrinsic AGN power, these correlations confirm AGN illumination of the circum-nuclear dust as the primary heating mechanism for the dust producing thermal MFIR emission at both 24 and 70 microns. We demonstrate that AGN heating is energetically feasible, and identify the narrow line region clouds as the most likely location of the cool, far-IR emitting dust. Starbursts make a major contribution to the heating of the cool dust in only 15-28% of our targets. We also investigate the orientation dependence of the continuum properties, finding that the broad- and narrow-line objects in our sample with strong emission lines have similar distributions of MFIR luminosities and colours. Therefore our results are entirely consistent with the orientation-based unified schemes for powerful radio galaxies. However, the weak line radio galaxies (WLRG) form a separate class of objects with intrinsically low luminosity AGN in which both the optical emission lines and the MFIR continuum are weak.Comment: 29 pages, 5 figures, Accepted for publication in The Astrophysical Journa

The origin of the infrared emission in radio galaxies. III. Analysis of 3CRR objects

We present Spitzer photometric data for a complete sample of 19 low redshift (z<0.1) 3CRR radio galaxies as part of our efforts to understand the origin of the prodigious mid- to far-infrared (MFIR) emission from radio-loud AGN. Our results show a correlation between AGN power (indicated by [OIII] 5007 emission line luminosity) and 24 micron luminosity. This result is consistent with the 24 micron thermal emission originating from warm dust heated directly by AGN illumination. Applying the same correlation test for 70 micron luminosity against [OIII] luminosity we find this relation to suffer from increased scatter compared to that of 24 micron. In line with our results for the higher-radio-frequency-selected 2Jy sample, we are able to show that much of this increased scatter is due to heating by starbursts which boost the far-infrared emission at 70 micron in a minority of objects (17-35%). Overall this study supports previous work indicating AGN illumination as the dominant heating mechanism for MFIR emitting dust in the majority of low to intermediate redshift radio galaxies (0.03<z<0.7), with the advantage of strong statistical evidence. However, we find evidence that the low redshift broad-line objects (z<0.1) are distinct in terms of their positions on the MFIR vs. [OIII] correlations.Comment: 31 pages, 3 figures, accepted for publication to Ap

Quasars are more luminous than radio galaxies - so what?

Surveys to find high-redshift radio galaxies deliberately exclude optically-bright objects, which may be distant radio-loud quasars. In order to properly determine the space density of supermassive black holes, the fraction of such objects missed must be determined within a quantitative framework for AGN unification. I briefly describe the receding torus model, which predicts that quasars should have more luminous ionizing continua than radio galaxies of similar radio luminosity, and present evidence to support it. I also suggest two further tests of the model which should constrain some of its parameters.Comment: 6 pages. To appear in "Radio galaxies: past, present and future", eds M. Jarvis et al., Leiden, Nov 200