All Outputs (750)

Towards a fundamental astrometric reference system behind the Malleganic clouds : spectroscopic confirmation of new quasar candidates selected in the near-infrared (2016)
Journal Article
Ivanov, V. D., Cioni, M.-R. L., Bekki, K., De Grijs, R., Emerson, J., Gibson, B. K., Kamath, D., Van Loon, J. T., Piatti, A., & For, B.-Q. (2016). Towards a fundamental astrometric reference system behind the Malleganic clouds : spectroscopic confirmation of new quasar candidates selected in the near-infrared. The Messenger, 32-34

Quasi-stellar objects (quasars) located behind nearby galaxies provide an excellent absolute reference system for astrometric studies, but they are difficult to identify because of fore- and background contamination. We have embarked on a programme t... Read More about Towards a fundamental astrometric reference system behind the Malleganic clouds : spectroscopic confirmation of new quasar candidates selected in the near-infrared.

New quasars behind the Magellanic Clouds. Spectroscopic confirmation of near-infrared selected candidates (2016)
Journal Article
Ivanov, V. D., Cioni, M.-R. L., Bekki, K., de Grijs, R., Emerson, J., Gibson, B. K., Kamath, D., van Loon, J. T., Piatti, A. E., & For, B.-Q. (2016). New quasars behind the Magellanic Clouds. Spectroscopic confirmation of near-infrared selected candidates. Astronomy and Astrophysics, 588, Article A93. https://doi.org/10.1051/0004-6361/201527398

Context. Quasi-stellar objects (quasars) located behind nearby galaxies provide an excellent absolute reference system for astrometric studies, but they are difficult to identify because of fore- and background contamination. Deep wide-field, high an... Read More about New quasars behind the Magellanic Clouds. Spectroscopic confirmation of near-infrared selected candidates.

The many assembly histories of massive void galaxies as revealed by integral field spectroscopy (2016)
Journal Article
Fraser-McKelvie, A., Pimbblet, K. A., Penny, S. J., & Brown, M. J. I. (2016). The many assembly histories of massive void galaxies as revealed by integral field spectroscopy. Monthly notices of the Royal Astronomical Society, 459(1), 754-770. https://doi.org/10.1093/mnras/stw677

We present the first detailed integral field spectroscopy study of nine central void galaxies with M*>10¹⁰Mʘ using the Wide Field Spectrograph to determine how a range of assembly histories manifest themselves in the current day Universe.While the ma... Read More about The many assembly histories of massive void galaxies as revealed by integral field spectroscopy.

Time-of-Flight measurements of Single-Electron wave packets in quantum hall edge states (2016)
Journal Article
Kataoka, M., Johnson, N., Emary, C., See, P., Griffiths, J., Jones, G., …Janssen, T. (2016). Time-of-Flight measurements of Single-Electron wave packets in quantum hall edge states. Physical review letters, 116(12), Article 126803. https://doi.org/10.1103/PhysRevLett.116.126803

We report time-of-flight measurements on electrons traveling in quantum Hall edge states. Hot-electron wave packets are emitted one per cycle into edge states formed along a depleted sample boundary. The electron arrival time is detected by driving a... Read More about Time-of-Flight measurements of Single-Electron wave packets in quantum hall edge states.

Nitrogen and oxygen abundances in the Local Universe (2016)
Journal Article
Vincenzo, F., Belfiore, F., Maiolino, R., Matteucci, F., & Ventura, P. (2016). Nitrogen and oxygen abundances in the Local Universe. Monthly notices of the Royal Astronomical Society, 458(4), 3466–3477. https://doi.org/10.1093/mnras/stw532

We present chemical evolution models aimed at reproducing the observed (N/O) vs. (O/H) abundance pattern of star forming galaxies in the Local Universe. We derive gas-phase abundances from SDSS spectroscopy and a complementary sample of low-metallici... Read More about Nitrogen and oxygen abundances in the Local Universe.

Are ancient dwarf satellites the building blocks of the Galactic halo? (2016)
Journal Article
Spitoni, E., Vincenzo, F., Matteucci, F., & Romano, D. (2016). Are ancient dwarf satellites the building blocks of the Galactic halo?. Monthly notices of the Royal Astronomical Society, 458(3), 2541-2552. https://doi.org/10.1093/mnras/stw519

According to the current cosmological cold dark matter paradigm, the Galactic halo could have been the result of the assemblage of smaller structures. Here we explore the hypothesis that the classical and ultra-faint dwarf spheroidal satellites of th... Read More about Are ancient dwarf satellites the building blocks of the Galactic halo?.

Frontier fields clusters: deep Chandra observations of the complex merger MACS~J1149.6+2223 (2016)
Journal Article
Ogrean, G. A., Van Weeren, R. J., Jones, C., Forman, W., Dawson, W. A., Golovich, N., Andrade-Santos, F., Murray, S. S., Nulsen, P., Roediger, E., Zitrin, A., Bulbul, E., Kraft, R., Goulding, A., Umetsu, K., Mroczkowski, T., Bonafede, A., Randall, S., Sayers, J., Churazov, E., …Ebeling, H. (2016). Frontier fields clusters: deep Chandra observations of the complex merger MACS~J1149.6+2223. The Astrophysical journal, 819(2), 113-1-113-13. https://doi.org/10.3847/0004-637X/819/2/113

The Hubble Space Telescope Frontier Fields cluster MACS J1149.6+2223 is one of the most complex merging clusters, believed to consist of four dark matter halos. We present results from deep (365 ks) Chandra observations of the cluster, which reveal t... Read More about Frontier fields clusters: deep Chandra observations of the complex merger MACS~J1149.6+2223.

High-precision timing of 42 millisecond pulsars with the European Pulsar Timing Array (2016)
Journal Article
Desvignes, G., Caballero, R. N., Lentati, L., Verbiest, J. P., Champion, D. J., Stappers, B. W., …Vecchio, A. (2016). High-precision timing of 42 millisecond pulsars with the European Pulsar Timing Array. Monthly notices of the Royal Astronomical Society, 458(3), 3341-3380. https://doi.org/10.1093/mnras/stw483

We report on the high-precision timing of 42 radio millisecond pulsars (MSPs) observed by the European Pulsar Timing Array (EPTA). This EPTA Data Release 1.0 extends up to mid-2014 and baselines range from 7-18 yr. It forms the basis for the stochast... Read More about High-precision timing of 42 millisecond pulsars with the European Pulsar Timing Array.

STELLAR ORIGINS OF EXTREMELY C-13- AND N-15-ENRICHED PRESOLAR SIC GRAINS: NOVAE OR SUPERNOVAE? (2016)
Journal Article
Liu, N., Nittler, L. R., Alexander, C. M. O., Wang, J., Pignatari, M., José, J., & Nguyen, A. (2016). STELLAR ORIGINS OF EXTREMELY C-13- AND N-15-ENRICHED PRESOLAR SIC GRAINS: NOVAE OR SUPERNOVAE?. The Astrophysical journal, 820(2), 1-14. https://doi.org/10.3847/0004-637X/820/2/140

Extreme excesses of 13C (12C/13C < 10) and 15N (14N/15N < 20) in rare presolar SiC grains have been considered diagnostic of an origin in classical novae, though an origin in core collapse supernovae (CCSNe) has also been proposed. We report C, N, an... Read More about STELLAR ORIGINS OF EXTREMELY C-13- AND N-15-ENRICHED PRESOLAR SIC GRAINS: NOVAE OR SUPERNOVAE?.

Jupiter's X-ray and EUV auroras monitored by Chandra, XXM-Newton, and Hisaki satellite (2016)
Journal Article
Badman, S. V., Branduardi-Raymont, G., Dunn, W. R., Elsner, R. F., Ezoe, Y., Fujimoto, M., Gladstone, G. R., Hasegawa, H., Kimura, T., Kraft, R. P., Masters, A., Murakami, G., Murray, S. S., Roediger, E., Tao, C., Tsuchiya, F., Vogt, M. F., Yamazaki, A., Yoshikawa, I., & Yoshioka, K. (2016). Jupiter's X-ray and EUV auroras monitored by Chandra, XXM-Newton, and Hisaki satellite. Journal of Geophysical Research: Space Physics, 121(3), 2308-2320. https://doi.org/10.1002/2015ja021893

Jupiter's X-ray auroral emission in the polar cap region results from particles which have undergone strong field-aligned acceleration into the ionosphere. The origin of precipitating ions and electrons and the time variability in the X-ray emission... Read More about Jupiter's X-ray and EUV auroras monitored by Chandra, XXM-Newton, and Hisaki satellite.

Properties of the outer regions of spiral disks: Abundances, colors and ages (2016)
Journal Article
Mollá, M., Díaz, A. I., Gibson, B. K., Cavichia, O., & López-Sánchez, Á.-R. (2016). Properties of the outer regions of spiral disks: Abundances, colors and ages. IAU symposium and colloquium proceedings series / International Astronomical Union. Symposium, 11(S321), 102-104. https://doi.org/10.1017/s1743921316011030

© 2017 International Astronomical Union. We summarize the results obtained from our suite of chemical evolution models for spiral disks, computed for different total masses and star formation efficiencies. Once the gas, stars and star formation radia... Read More about Properties of the outer regions of spiral disks: Abundances, colors and ages.

First direct measurement of 12C (12C,n) 23Mg at stellar energies (2016)
Journal Article
Tang, X., Bucher, B., Fang, X., Heger, A., Almaraz-Calderon, S., Alongi, A., Ayangeakaa, A., Beard, M., Best, A., Browne, J., Cahillane, C., Couder, M., DeBoer, R., Kontos, A., Lamm, L., Li, Y., Long, A., Lu, W., Lyons, S., Notani, M., …Woosley, S. (2016). First direct measurement of 12C (12C,n) 23Mg at stellar energies. EPJ Web of Conferences, 109, 04009. https://doi.org/10.1051/epjconf/201610904009

© 2016 Owned by the authors, published by EDP Sciences. Neutrons produced by the carbon fusion reaction12C(12C,n)23Mg play an important role in stellar nucleosynthesis. Past studies have shown large discrepancies between experimental data and theory,... Read More about First direct measurement of 12C (12C,n) 23Mg at stellar energies.

Origin of the metallicity distribution in the thick disc (2016)
Journal Article
Miranda, M. S., Pilkington, K., Gibson, B. K., Brook, C. B., Sánchez-Blázquez, P., Minchev, I., Few, C. G., Smith, R., Domínguez-Tenreiro, R., Obreja, A., Bailin, J., & Stinson, G. S. (2016). Origin of the metallicity distribution in the thick disc. Astronomy and Astrophysics, 587, Article A10. https://doi.org/10.1051/0004-6361/201525789

Using a suite of cosmological chemodynamical disc galaxy simulations, we assess how (a) radial metallicity gradients evolve with scaleheight; (b) the vertical metallicity gradients change through the thick disc; and (c) the vertical gradient of the s... Read More about Origin of the metallicity distribution in the thick disc.

Shocking features in the merging galaxy cluster RXJ0334.2-0111 (2016)
Journal Article
Dasadia, S., Sun, M., Morandi, A., Sarazin, C., Clarke, T., Nulsen, P., Massaro, F., Roediger, E., Harris, D., & Forman, B. (2016). Shocking features in the merging galaxy cluster RXJ0334.2-0111. Monthly notices of the Royal Astronomical Society, 458(1), 681-694. https://doi.org/10.1093/mnras/stw291

© 2016 The Authors. We present a 66 ks Chandra X-ray observation of the galaxy cluster RXJ0334.2-0111. This deep observation revealed a unique bow shock system associated with a wide angle tail (WAT) radio galaxy and several intriguing substructures.... Read More about Shocking features in the merging galaxy cluster RXJ0334.2-0111.

Vibrational anharmonicity of small gold and silver clusters using the VSCF method (2016)
Journal Article
Mancera, L. A., & Benoit, D. M. (2016). Vibrational anharmonicity of small gold and silver clusters using the VSCF method. Physical chemistry chemical physics : PCCP, 18(1), 529-549. https://doi.org/10.1039/c5cp05283a

We study the vibrational spectra of small neutral gold (Au2–Au10) and silver (Ag2–Au5) clusters using the vibrational self-consistent field method (VSCF) in order to account for anharmonicity. We report harmonic, VSCF, and correlation-corrected VSCF... Read More about Vibrational anharmonicity of small gold and silver clusters using the VSCF method.

Identification of Globular Cluster Stars in RAVE data II: Extended tidal debris around NGC 3201 (2016)
Journal Article
Anguiano, B., De Silva, G. M., Freeman, K., Da Costa, G. S., Zwitter, T., Quillen, A. C., Zucker, D. B., Navarro, J. F., Kunder, A., Siebert, A., Wyse, R. F. G., Grebel, E. K., Kordopatis, G., Gibson, B. K., Seabroke, G., Sharma, S., Wojno, J., Bland-Hawthorn, J., Parker, Q. A., Steinmetz, M., …Watson, F. (2016). Identification of Globular Cluster Stars in RAVE data II: Extended tidal debris around NGC 3201. Monthly notices of the Royal Astronomical Society, 457(2), 2078-2085. https://doi.org/10.1093/mnras/stw083

We report the identification of extended tidal debris potentially associated with the globular cluster NGC 3201, using the RAdial Velocity Experiment (RAVE) catalogue. We find the debris stars are located at a distance range of 1–7 kpc based on the f... Read More about Identification of Globular Cluster Stars in RAVE data II: Extended tidal debris around NGC 3201.

Thermally induced magnetization switching in Gd/Fe multilayers (2016)
Journal Article
Xu, C., Ostler, T. A., & Chantrell, R. W. (2016). Thermally induced magnetization switching in Gd/Fe multilayers. Physical Review B, 93(5), Article 054302. https://doi.org/10.1103/PhysRevB.93.054302

A theoretical model of Gd/Fe multilayers is constructed using the atomistic spin dynamics formalism. By varying the thicknesses and number of layers we have shown that a strong dependence of the energy required for thermally induced magnetization swi... Read More about Thermally induced magnetization switching in Gd/Fe multilayers.

The imprint of satellite accretion on the chemical and dynamical properties of disc galaxies (2016)
Journal Article
Ruiz-Lara, T., Few, C. G., Gibson, B. K., Pérez, I., Florido, E., Minchev, I., & Sánchez-Blázquez, P. (2016). The imprint of satellite accretion on the chemical and dynamical properties of disc galaxies. Astronomy and Astrophysics, 586, A112. https://doi.org/10.1051/0004-6361/201526470

Aims. We study the effects of the cosmological assembly history on the chemical and dynamical properties of the discs of spiral galaxies as a function of radius. Methods. We made use of the simulated Milky Way mass, fully-cosmological discs from Rams... Read More about The imprint of satellite accretion on the chemical and dynamical properties of disc galaxies.

The discovery of lensed radio and x-ray sources behind the frontier fields cluster MACS J0717.5+3745 with the JVLA and Chandra (2016)
Journal Article
van Weeren, R. J., Ogrean, G. A., Jones, C., Forman, W. R., Andrade-Santos, F., Bonafede, A., Brüggen, M., Bulbul, E., Clarke, T. E., Churazov, E., David, L., Dawson, W. A., Donahue, M., Goulding, A., Kraft, R. P., Mason, B., Merten, J., Mroczkowski, T., Murray, S. S., Nulsen, P. E. J., …Zitrin, A. (2016). The discovery of lensed radio and x-ray sources behind the frontier fields cluster MACS J0717.5+3745 with the JVLA and Chandra. The Astrophysical journal, 817(2), Article ARTN 98. https://doi.org/10.3847/0004-637x/817/2/98

© 2016. The American Astronomical Society. All rights reserved.. We report on high-resolution JVLA and Chandra observations of the Hubble Space Telescope (HST) Frontier Cluster MACS J0717.5+3745. MACS J0717.5+3745 offers the largest contiguous magnif... Read More about The discovery of lensed radio and x-ray sources behind the frontier fields cluster MACS J0717.5+3745 with the JVLA and Chandra.

Phonon emission and arrival times of electrons from a single-electron source (2016)
Journal Article
Emary, C., Dyson, A., Ryu, S., Sim, H.-S., & Kataoka, M. (2016). Phonon emission and arrival times of electrons from a single-electron source. Physical Review B, 93(3), Article ARTN 035436. https://doi.org/10.1103/PhysRevB.93.035436

In recent charge-pump experiments, single electrons are injected into quantum Hall edge channels at energies significantly above the Fermi level. We consider here the relaxation of these hot edge-channel electrons through longitudinal-optical-phonon... Read More about Phonon emission and arrival times of electrons from a single-electron source.