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How frequent are close supermassive binary black holes in powerful jet sources?

Krause, Martin G. H.; Shabala, Stanislav S.; Hardcastle, Martin J.; Böhringer, Hans; Chon, Gayoung; Nawaz, Mohammad A.; Sarzi, Marc; Wagner, Alexander Y. (2019-01-01)

Supermassive black hole binariesmay be detectable by an upcoming suite of gravitationalwave experiments. Their binary nature can also be revealed by radio jets via a short-period precession driven by the orbital motion as ...

Transmuting CHY formulae

Ferro, Livia; Bollmann, Max (2019-01)

The various formulations of scattering amplitudes presented in recent years have underlined a hidden unity among very different theories. The KLT and BCJ relations, together with the CHY formulation, connect the S-matrices ...

Amplituhedron meets Jeffrey-Kirwan Residue

Ferro, Livia; Lukowski, Tomasz; Parisi, Matteo (2018-12-28)

The tree amplituhedra A^(m)_n,k are mathematical objects generalising the notion of polytopes into the Grassmannian. Proposed for m=4 as a geometric construction encoding tree-level scattering amplitudes in planar N=4 super ...

Transfer learning for galaxy morphology from one survey to another

Sánchez, H. Domínguez; Huertas-Company, M.; Bernardi, M.; Kaviraj, S.; Fischer, J. L.; Abbott, T. M. C.; Abdalla, F. B.; Annis, J.; Avila, S.; Buckley-Geer, E.; Rosell, A. Carnero; Kind, M. Carrasco; Carretero, J.; Cunha, C. E.; D'Andrea, C. B.; Costa, L. N. da; Davis, C.; Vicente, J. De; Doel, P.; Evrard, A. E.; Fosalba, P.; Frieman, J.; García-Bellido, J.; Gaztanaga, E.; Gerdes, D. W.; Gruen, D.; Gruendl, R. A.; Gschwend, J.; Gutierrez, G.; Hartley, W. G.; Hollowood, D. L.; Honscheid, K.; Hoyle, B.; Kuehn, K.; Kuropatkin, N.; Lahav, O.; Maia, M. A. G.; March, M.; Melchior, P.; Menanteau, F.; Miquel, R.; Nord, B.; Plazas, A. A.; Sanchez, E.; Scarpine, V.; Schindler, R.; Schubnell, M.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Swanson, M. E. C.; Tarle, G.; Walker, A. R.; Zuntz, J. (2018-12-28)

Deep Learning (DL) algorithms for morphological classification of galaxies have proven very successful, mimicking (or even improving) visual classifications. However, these algorithms rely on large training samples of ...

New Galactic star clusters discovered in the disc area of the VVVX survey

Borissova, J.; Ivanov, V. D.; Lucas, P. W.; Kurtev, R.; Alonso-Garcia, J.; Alegria, S. Ramirez; Minniti, D.; Hempel, M.; Medina, N.; Chene, A. N.; Kuhn, M. A. (2018-12-11)

The "VISTA Variables in the Via Lactea eXtended (VVVX)" ESO Public Survey is a near-infrared photometric sky survey that covers nearly 1700 sq. deg towards the Galactic disk and bulge. It is well-suited to search for new ...

The Gaia/IPHAS and Gaia/KIS value-added catalogues

Scaringi, S.; Knigge, C.; Drew, J. E.; Monguió, M.; Breedt, E.; Fratta, M.; Gänsicke, B.; Maccarone, T. J.; Pala, A. F.; Schill, C. (2018-12-11)

We present a sub-arcsecond crossmatch of Gaia DR2 against the INT Photometric Ha Survey of the Northern Galactic Plane Data Release 2 (IPHAS DR2) and the Kepler-INT Survey (KIS). The resulting value-added catalogues (VACs) ...

JINGLE, a JCMT legacy survey of dust and gas for galaxy evolution studies : I. Survey overview and first results

Saintonge, Amelie; Wilson, Christine D.; Xiao, Ting; Lin, Lihwai; Hwang, Ho Seong; Tosaki, Tomoka; Bureau, Martin; Cigan, Phillip J.; Clark, Christopher J. R.; Clements, David L.; Looze, Ilse De; Dharmawardena, Thavisha; Gao, Yang; Gear, Walter K.; Greenslade, Joshua; Lamperti, Isabella; Lee, Jong Chul; Li, Cheng; Michalowski, Michal J.; Mok, Angus; Pan, Hsi-An; Sansom, Anne E.; Sargent, Mark; Smith, Matthew W. L.; Williams, Thomas; Yang, Chentao; Zhu, Ming; Accurso, Gioacchino; Barmby, Pauline; Bourne, Nathan; Brinks, Elias; Brown, Toby; Chung, Aeree; Chung, Eun Jung; Cibinel, Anna; Coppin, Kristen; Davies, Jonathan; Davis, Timothy A.; Eales, Steve; Fanciullo, Lapo; Fang, Taotao; Gao, Yu; Glass, David H. W.; Gomez, Haley L.; Greve, Thomas; He, Jinhua; Ho, Luis C.; Huang, Feng; Parsons, Harriet; Violino, Giulio (2018-12-11)

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 ...

Parallaxes of southern extremely cool objects III : 118 L and T dwarfs

Smart, R. L.; Bucciarelli, B.; Jones, H. R. A.; Marocco, F.; Andrei, A. H.; Goldman, B.; Mendez, R. A.; d'Avila, V. A.; Burningham, B.; Camargo, J. I. B.; Crosta, M. T.; Daprà, M.; Jenkins, J. S.; Lachaume, R.; Lattanzi, M. G.; Penna, J. L.; Pinfield, D. J.; Neto, D. N. da Silva; Sozzetti, A.; Vecchiato, A. (2018-12-11)

We present new results from the Parallaxes of Southern Extremely Cool dwarfs program to measure parallaxes, proper motions and multiepoch photometry of L and early T dwarfs. The observations were made on 108 nights over ...

Probabilistic galactic dynamics I - the Sun and GJ 710 with Monte Carlo, linearised and unscented treatments

Feng, Fabo; Jones, Hugh R. A. (2018-12-07)

Deterministic galactic dynamics is impossible due to the space-time randomness caused by gravitational waves. Instead of treating stellar orbits deterministically, we integrate not only the mean but also the covariance of ...

The Effect of Galaxy Interactions on Molecular Gas Properties

Pan, Hsi-An; Lin, Lihwai; Hsieh, Bau-Ching; Xiao, Ting; Gao, Yang; Ellison, Sara L.; Scudder, Jillian M.; Barrera-Ballesteros, Jorge; Yuan, Fangting; Saintonge, Amélie; Wilson, Christine D.; Hwang, Ho Seong; Looze, Ilse De; Gao, Yu; Ho, Luis C.; Brinks, Elias; Mok, Angus; Brown, Toby; Davis, Timothy A.; Williams, Thomas G.; Chung, Aeree; Parsons, Harriet; Bureau, Martin; Sargent, Mark T.; Chung, Eun Jung; Kim, Eunbin; Liu, Tie; Michałowski, Michał J.; Tosaki, Tomoka (2018-12-03)

Galaxy interactions are often accompanied by an enhanced star formation rate (SFR). Since molecular gas is essential for star formation, it is vital to establish whether and by how much galaxy interactions affect the ...