Search Publications
The Holy Grail: A road map for unlocking the climate record stored within Mars' polar layered deposits
Horgan, Briony; Byrne, Shane; Zacny, Kris +35 more
In its polar layered deposits (PLD), Mars possesses a record of its recent climate, analogous to terrestrial ice sheets containing climate records on Earth. Each PLD is greater than 2 km thick and contains thousands of layers, each containing information on the climatic and atmospheric state during its deposition, creating a climate archive. With …
Molecular gas inflows and outflows in ultraluminous infrared galaxies at z ∼ 0.2 and one QSO at z = 6.1
Lutz, D.; Genzel, R.; Maiolino, R. +12 more
Aims: Our aim is to search for and characterize inflows and outflows of molecular gas in four ultraluminous infrared galaxies (ULIRGs; LIR > 1012L⊙) at z ∼ 0.2-0.3 and one distant quasi-stellar object (QSO) at z = 6.13.
Methods: We used Herschel/PACS and ALMA Band 7 observations of the hydroxyl molecul…
The Structure of Tidal Disruption Event Host Galaxies on Scales of Tens to Thousands of Parsecs
Zabludoff, Ann I.; French, K. Decker; van Velzen, Sjoert +5 more
We explore the galaxy structure of four tidal disruption event (TDE) host galaxies on 30 pc to kiloparsec scales using Hubble Space Telescope WFC3 multiband imaging. The star formation histories of these hosts are diverse, including one post-starburst galaxy (ASASSN-14li), two hosts with recent weak starbursts (ASASSN-14ae and iPTF15af), and one e…
Strong Soft X-Ray Excess in 2015 XMM-Newton Observations of BL Lac OJ 287
Dewangan, G. C.; Pal, Main; Kushwaha, Pankaj +1 more
We report a strong soft X-ray excess in the BL Lacartae γ-ray blazar OJ 287 during long exposure in 2015 May, among two of the latest XMM-Newton observations performed in 2015 and 2018 May. In the case of the 2015 May observation, a log parabola model fits the EPIC-pn data well, while a log parabola plus a power law describes the overall simultane…
A Featureless Infrared Transmission Spectrum for the Super-puff Planet Kepler-79d
Deming, Drake; Madhusudhan, Nikku; Wakeford, Hannah R. +12 more
Extremely low-density planets ("super-puffs") are a small but intriguing subset of the transiting planet population. With masses in the super-Earth range (1 - 10 ${M}_{\oplus }$ ) and radii akin to those of giant planets (> 4 ${R}_{\oplus }$ ), their large envelopes may have been accreted beyond the water snow line and many appear to be suscept…
Investigating the spectral age problem with powerful radio galaxies
Croston, Judith H.; Hardcastle, Martin J.; Mahatma, Vijay H. +3 more
The 'spectral age problem' is our systematic inability to reconcile the maximum cooling time of radiating electrons in the lobes of a radio galaxy with its age as modelled by the dynamical evolution of the lobes. While there are known uncertainties in the models that produce both age estimates, 'spectral' ages are commonly underestimated relative …
Multiphase outflows in post-starburst E+A galaxies - II. A direct connection between the neutral and ionized outflow phases
Netzer, Hagai; Xavier Prochaska, J.; Baron, Dalya +1 more
Post-starburst E+A galaxies are systems that hosted a powerful starburst that was quenched abruptly. Simulations suggest that these systems provide the missing link between major merger ULIRGs and red and dead ellipticals, where AGN feedback is responsible for the expulsion or destruction of the molecular gas. However, many details remain unresolv…
NuSTAR Perspective on High-redshift MeV Blazars
Ajello, M.; Gasparrini, D.; Marchesi, S. +7 more
With bolometric luminosities exceeding 1048 erg s-1, powerful jets, and supermassive black holes at their center, MeV blazars are some of the most extreme sources in the universe. Recently, the Fermi-Large Area Telescope detected five new γ-ray emitting MeV blazars beyond redshift z = 3.1. With the goal of precisely character…
Spectroscopic characterization of the known O-star population in Cygnus OB2. Evidence of multiple star-forming bursts
Lennon, D. J.; Herrero, A.; Comerón, F. +6 more
Context. Cygnus OB2 provides a unique insight into the high-mass stellar content in one of the largest groups of young massive stars in our Galaxy. Although several studies of its massive population have been carried out over the last decades, an extensive spectroscopic study of the whole known O-star population in the association is still lacking…
Binary-induced spiral arms inside the disc cavity of AB Aurigae
Pinte, Christophe; Ribas, Álvaro; Macías, Enrique +5 more
In this work we demonstrate that the inner spiral structure observed in AB Aurigae can be created by a binary star orbiting inside the dust cavity. We find that a companion with a mass-ratio of 0.25, semimajor axis of 40 au, eccentricity of 0.5, and inclination of 90° produces gaseous spirals closely matching the ones observed in 12CO (…