Entire DC Network | Open Access Articles | Digital Commons Network™

Jingle, A Jcmt Legacy Survey Of Dust And Gas For Galaxy Evolution Studies - I. Survey Overview And First Results, Amélie Saintonge, Christine D. Wilson, Ting Xiao, Lihwai Lin, Ho Seong Hwang, Tomoka Tosaki, Martin Bureau, Phillip J. Cigan, Christopher J.R. Clark, David L. Clements, Ilse De Looze, Thavisha Dharmawardena, Yang Gao, Walter K. Gear, Joshua Greenslade, Isabella Lamperti, Jong Chul Lee, Cheng Li, Michal J. Michałowski, Angus Mok, Hsi An Pan, Anne E. Sansom, Mark Sargent, Matthew W. Matthew, Thomas Williams, Chentao Yang, Ming Zhu, Gioacchino Accurso, Pauline Barmby

Physics and Astronomy Publications

JINGLE is a new JCMT legacy survey designed to systematically study the cold interstellar medium of galaxies in the local Universe. As part of the survey we perform 850 μm continuum measurements with SCUBA-2 for a representative sample of 193 Herschel-selected galaxies with M* > 109 M⊙, as well as integrated CO(2-1) line fluxes with RxA3m for a subset of 90 of these galaxies. The sample is selected from fields covered by the Herschel-ATLAS survey that are also targeted by the MaNGA optical integral-field spectroscopic survey. The new JCMT observations combined with the multiwavelength ancillary data will allow for the robust …

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The Large-Scale Structure Of The Halo Of The Andromeda Galaxy. Ii. Hierarchical Structure In The Pan-Andromeda Archaeological Survey, Alan W. Mcconnachie, Rodrigo Ibata, Nicolas Martin, Annette M.N. Ferguson, Michelle Collins, Stephen Gwyn, Mike Irwin, Geraint F. Lewis, A. Dougal Mackey, Tim Davidge, Veronica Arias, Anthony Conn, Patrick Côté, Denija Crnojevic, Avon Huxor, Jorge Penarrubia, Chelsea Spengler, Nial Tanvir, David Valls-Gabaud, Arif Babul, Pauline Barmby, Nicholas F. Bate, Edouard Bernard, Scott Chapman, Aaron Dotter, William Harris, Brendan Mcmonigal, Julio Navarro, Thomas H. Puzia

Physics and Astronomy Publications

The Pan-Andromeda Archaeological Survey is a survey of >400 square degrees centered on the Andromeda (M31) and Triangulum (M33) galaxies that has provided the most extensive panorama of an L ∗ galaxy group to large projected galactocentric radii. Here, we collate and summarize the current status of our knowledge of the substructures in the stellar halo of M31, and discuss connections between these features. We estimate that the 13 most distinctive substructures were produced by at least 5 different accretion events, all in the last 3 or 4 Gyr. We suggest that a few of the substructures farthest from M31 …

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The Astropy Project: Building An Open-Science Project And Status Of The V2.0 Core Package, A. M. Price-Whelan, B. M. Sipõcz, H. M. Günther, P. L. Lim, S. M. Crawford, S. Conseil, D. L. Shupe, M. W. Craig, N. Dencheva, A. Ginsburg, J. T. Vanderplas, L. D. Bradley, D. Pérez-Suárez, M. De Val-Borro, T. L. Aldcroft, K. L. Cruz, T. P. Robitaille, E. J. Tollerud, C. Ardelean, T. Babej, Y. P. Bach, M. Bachetti, A. V. Bakanov, S. P. Bamford, G. Barentsen, P. Barmby, A. Baumbach, K. L. Berry, F. Biscani

Physics and Astronomy Publications

The Astropy Project supports and fosters the development of open-source and openly developed Python packages that provide commonly needed functionality to the astronomical community. A key element of the Astropy Project is the core package astropy, which serves as the foundation for more specialized projects and packages. In this article, we provide an overview of the organization of the Astropy project and summarize key features in the core package, as of the recent major release, version 2.0. We then describe the project infrastructure designed to facilitate and support development for a broader ecosystem of interoperable packages. We conclude with a …

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Classifying Galaxy Spectra At 0.5 < Z < 1 With Self-Organizing Maps, S. Rahmani, H. Teimoorinia, P. Barmby

Physics and Astronomy Publications

The spectrum of a galaxy contains information about its physical properties. Classifying spectra using templates helps to elucidate the nature of a galaxy's energy sources. In this paper, we investigate the use of self-organizing maps in classifying galaxy spectra against templates. We trained semi-supervised self-organizing map networks using a set of templates covering the wavelength range from far ultraviolet to near-infrared. The trained networks were used to classify the spectra of a sample of 142 galaxies with 0.5 < z < 1 and the results compared to classifications performed using K-means clustering, a supervised neural network, and chi-squared minimization. Spectra corresponding to quiescent galaxies were more likely to be classified similarly by all methods while starburst spectra showed more variability. Compared to classification using chi-squared minimization or the supervised neural network, the galaxies classed together by the self-organizing map had more similar spectra. The class ordering provided by the 1D self-organizing maps corresponds to an ordering in physical properties, a potentially important feature for the exploration of large data sets.

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Controlling The Hydrophilicity And Cohesion During Deposition Of Highly Oriented Type I Collagen Films: An Approach For Biomedical Applications, Karina Ambrock, Bernd Grohe, Silvia Mittler

Physics and Astronomy Publications

Using the Langmuir-Blodgett (LB) technology we have pioneered a straightforward and low-cost approach to fabricate highly oriented collagen in thin film format (thickness: ~20 nm, surface areas: 2.5 x ~6.0 cm). An important factor for the use of these films is their cohesion under various conditions. Film formation was studied by coating hydrophilic or hydrophobic glass substrates. The fresh or aged (2 ½ years, -18°C.) collagen solutions used for this purpose either contained collagen network-stabilizing agents (n-propanol or phosphate ions) or were prepared without these stabilizers. Film formation on the air/water interface was analyzed by pressure-area isotherms. Maximum surface pressures …

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A Virgo Environmental Survey Tracing Ionised Gas Emission (Vestige): I. Introduction To The Survey, A. Boselli, M. Fossati, L. Ferrarese, S. Boissier, G. Consolandi, A. Longobardi, P. Amram, M. Balogh, P. Barmby, M. Boquien, F. Boulanger, J. Braine, V. Buat, D. Burgarella, F. Combes, T. Contini, L. Cortese, P. Côté, S. Côté, J. C. Cuillandre, L. Drissen, B. Epinat, M. Fumagalli, S. Gallagher, G. Gavazzi, J. Gomez-Lopez, S. Gwyn, W. Harris, G. Hensler

Physics and Astronomy Publications

The Virgo Environmental Survey Tracing Ionised Gas Emission (VESTIGE) is a blind narrow-band (NB) Hα+[NII] imaging survey carried out with MegaCam at the Canada-France-Hawaii Telescope. The survey covers the whole Virgo cluster region from its core to one virial radius (104 deg2). The sensitivity of the survey is of f(Hα) ∼ 4 × 10-17 erg s-1 cm-2 (5σ detection limit) for point sources and Σ(Hα) ∼ 2 × 10-18 erg s-1 cm-2 arcsec-2 (1σ detection limit at 3 arcsec resolution) for extended sources, making VESTIGE the deepest and largest blind NB survey of a nearby cluster. This paper presents the …

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Milky Way Globular Cluster Metallicity And Low-Mass X-Ray Binaries: The Red Giant Influence, N. Vulic, P. Barmby, S. C. Gallagher

Physics and Astronomy Publications

Galactic and extragalactic studies have shown that metal-rich globular clusters (GCs) are approximately three times more likely to host bright low-mass X-ray binaries (LMXBs) than metal-poor GCs. There is no satisfactory explanation for this metallicity effect. We tested the hypothesis that the number density of red giant branch (RGB) stars is larger in metal-rich GCs, and thus potentially the cause of the metallicity effect. Using Hubble Space Telescope photometry for 109 unique Milky Way GCs, we investigated whether RGB star density was correlated with GC metallicity. Isochrone fitting was used to calculate the number of RGB stars, which were normalized …

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A Mass-Producible And Versatile Sensing System: Localized Surface Plasmon Resonance Excited By Individual Waveguide Modes, Zhutian Ding, James M. Stubbs, Danielle Mcrae, Johanna M. Blacquiere, François Lagugné-Labarthet, Silvia Mittler

Physics and Astronomy Publications

A plasmonic sensing system that allows the excitation of localized surface plasmon resonance (LSPR) by individual waveguide modes is presented conceptually and experimentally. Any change in the local environment of the gold nanoparticles (AuNPs) alters the degree of coupling between LSPR and a polymer slab waveguide, which then modulates the transmission-output signal. In comparison to conventional LSPR sensors, this system is less susceptible to optical noise and positional variation of signals. Moreover, it enables more freedom in the exploitation of plasmonic hot spots with both transverse electric (TE) and transverse magnetic (TM) modes. Through real-time measurement, it is demonstrated that …

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Narrowing Of Plasmon Resonance Peaks As An Ensemble Effect, Zhutian Ding, James M. Stubbs, Silvia Mittler

Physics and Astronomy Publications

The frequency of localized surface plasmon resonance (LSPR) displayed by gold nanoparticles (AuNPs) redshifts as a function of their local refractive index, which renders them valuable transducers for sensing applications. An ensemble hypothesis is presented herein, along with spectroscopic evidence, using the biotin-streptavidin system on immobilized AuNPs to interpret the decrease in ensemble linewidth (ELW) consistently observed upon functionalization of plasmonic nanoparticles and the subsequent analyte binding. These results demonstrate that ELW can be used to monitor recognition reactions, providing spectral details and a possible sensitivity enhancement to the conventional wavelength sensing. A novel sensing platform allowing the simultaneous measurement …

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Physics and Astronomy Publications

Physics and Astronomy Publications

Physics and Astronomy Publications

Classifying Galaxy Spectra At 0.5 < Z < 1 With Self-Organizing Maps, S. Rahmani, H. Teimoorinia, P. Barmby

Physics and Astronomy Publications

Controlling The Hydrophilicity And Cohesion During Deposition Of Highly Oriented Type I Collagen Films: An Approach For Biomedical Applications, Karina Ambrock, Bernd Grohe, Silvia Mittler

Physics and Astronomy Publications

Physics and Astronomy Publications

Milky Way Globular Cluster Metallicity And Low-Mass X-Ray Binaries: The Red Giant Influence, N. Vulic, P. Barmby, S. C. Gallagher

Physics and Astronomy Publications

A Mass-Producible And Versatile Sensing System: Localized Surface Plasmon Resonance Excited By Individual Waveguide Modes, Zhutian Ding, James M. Stubbs, Danielle Mcrae, Johanna M. Blacquiere, François Lagugné-Labarthet, Silvia Mittler

Physics and Astronomy Publications

Narrowing Of Plasmon Resonance Peaks As An Ensemble Effect, Zhutian Ding, James M. Stubbs, Silvia Mittler

Physics and Astronomy Publications