Search Publications

A disc wind interpretation of the strong Fe Kα features in 1H 0707-495

Done, Chris; Takahashi, Tadayuki; Hagino, Kouichi +3 more

1H 0707-495 is the most convincing example of a supermassive black hole with an X-ray spectrum being dominated by extremely smeared, relativistic reflection, with the additional requirement of strongly supersolar iron abundance. However, here we show that the iron features in its 2-10 keV spectrum are rather similar to the archetypal wind dominate…

Cosmological limits on neutrino unknowns versus low redshift priors

Di Valentino, Eleonora; Melchiorri, Alessandro; Mena, Olga +2 more

Recent cosmic microwave background (CMB) temperature and polarization anisotropy measurements from the Planck mission have significantly improved previous constraints on the neutrino masses as well as the bounds on extended models with massless or massive sterile neutrino states. However, due to parameter degeneracies, additional low redshift prio…

Proplyds Around a B1 Star: 42 Orionis in NGC 1977

Fang, Min; Facchini, Stefano; Clarke, Cathie J. +1 more

We present the discovery of seven new proplyds (I.e., sources surrounded by cometary Hα emission characteristic of offset ionization fronts (IFs)) in NGC 1977, located about 30‧ north of the Orion Nebula Cluster (ONC) at a distance of ∼400 pc. Each of these proplyds is situated at projected distances 0.04-0.27 pc from the B1V star 42 Orionis (c Or…

A Comprehensive Census of Nearby Infrared Excess Stars

Song, Inseok; Cotten, Tara H.

The conclusion of the Wide-Field Infrared Survey Explorer (WISE) mission presents an opportune time to summarize the history of using excess emission in the infrared as a tracer of circumstellar material and exploit all available data for future missions such as the James Webb Space Telescope. We have compiled a catalog of infrared excess stars fr…

The Strikingly Uniform, Highly Turbulent Interstellar Medium of the Most Luminous Galaxy in the Universe

Stern, D.; Wu, J.; Aravena, M. +6 more

Observed at z = 4.601 and with L_bol = 3.5 × 10¹⁴ L_⊙ , W2246-0526 is the most luminous galaxy known in the universe and hosts a deeply buried active galactic nucleus (AGN)/supermassive black hole (SMBH). Discovered using the Wide-field Infrared Survey Explorer, W2246-0526 is classified as a hot dust-obscured galaxy,…

Frontier Fields: Subaru Weak-Lensing Analysis of the Merging Galaxy Cluster A2744

Massey, Richard; Umetsu, Keiichi; Medezinski, Elinor +5 more

We present a weak-lensing analysis of the merging Frontier Fields (FF) cluster Abell 2744 using new Subaru/Suprime-Cam imaging. The wide-field lensing mass distribution reveals this cluster is comprised of four distinct substructures. Simultaneously modeling the two-dimensional reduced shear field using a combination of a Navarro-Frenk-White (NFW)…

Cloud Atlas: Discovery of Patchy Clouds and High-amplitude Rotational Modulations in a Young, Extremely Red L-type Brown Dwarf

Schneider, Glenn; Cowan, Nicolas B.; Burgasser, Adam J. +10 more

Condensate clouds fundamentally impact the atmospheric structure and spectra of exoplanets and brown dwarfs, but the connections between surface gravity, cloud structure, dust in the upper atmosphere, and the red colors of some brown dwarfs remain poorly understood. Rotational modulations enable the study of different clouds in the same atmosphere…

Insights into surface runoff on early Mars from paleolake basin morphology and stratigraphy

Mustard, John F.; Goudge, Timothy A.; Head, James W. +2 more

Chandra Observes the End of an Era in SN 1987A

Zhekov, Svetozar A.; Dwek, Eli; Park, Sangwook +3 more

Updated imaging and photometric results from Chandra observations of SN 1987A, covering the last 16 years, are presented. We find that the 0.5-2 keV light curve has remained constant at ∼8 × 10^-12 erg s^-1 cm^-2 since 9500 days, with the 3-8 keV light curve continuing to increase until at least 10,000 days. The expan…

Gaia Data Release 1. Principles of the photometric calibration of the G band

Jordi, C.; Balaguer-Núñez, L.; Evans, D. W. +24 more

Context. Gaia is an ESA cornerstone mission launched on 19 December 2013 aiming to obtain the most complete and precise 3D map of our Galaxy by observing more than one billion sources. This paper is part of a series of documents explaining the data processing and its results for Gaia Data Release 1, focussing on the G band photometry.
Aims: T…