Search Publications
Searching for Cool Dust. II. Infrared Imaging of The OH/IR Supergiants, NML Cyg, VX Sgr, S Per, and the Normal Red Supergiants RS Per and T Per
Gehrz, Robert D.; Humphreys, Roberta M.; Jones, Terry J. +6 more
New MMT/MIRAC (9-11 µm), SOFIA/FORCAST (11-37 µm), and Herschel/PACS (70 and 160 µm) infrared (IR) imaging and photometry is presented for three famous OH/IR red supergiants (NML Cyg, VX Sgr, and S Per) and two normal red supergiants (RS Per and T Per). We model the observed spectral energy distributions (SEDs) using radiative-tr…
Model-independent and model-based local lensing properties of CL0024+1654 from multiply imaged galaxies
Liesenborgs, Jori; Wagner, Jenny; Tessore, Nicolas
Context. Local gravitational lensing properties, such as convergence and shear, determined at the positions of multiply imaged background objects, yield valuable information on the smaller-scale lensing matter distribution in the central part of galaxy clusters. Highly distorted multiple images with resolved brightness features like the ones obser…
Chemical analysis of very metal-poor turn-off stars from SDSS-DR12
Salvadori, S.; Bonifacio, P.; Caffau, E. +8 more
Context. The most metal-poor stars are the relics of the early chemical evolution of the Galaxy. Their chemical composition is an important tool to constrain the nucleosynthesis in the first generation of stars. The aim is to observe a sample of extremely metal-poor star (EMP stars) candidates selected from the Sloan Digital Sky Survey Data Releas…
Identification of two new HMXBs in the LMC: an ∼2013 s pulsar and a probable SFXT
Haberl, F.; Hatzidimitriou, D.; Vasilopoulos, G. +2 more
We report on the X-ray and optical properties of two high-mass X-ray binary systems located in the Large Magellanic Cloud (LMC). Based on the obtained optical spectra, we classify the massive companion as a supergiant star in both systems. Timing analysis of the X-ray events collected by XMM-Newton revealed the presence of coherent pulsations (spi…
Multipoint Analysis of Electric Currents in Geospace Using the Curlometer Technique
Russell, C. T.; Escoubet, C. P.; Dunlop, M. W. +6 more
Noble Gas Abundance Ratios Indicate the Agglomeration of 67P/Churyumov-Gerasimenko from Warmed-up Ice
Wurz, P.; Lunine, J. I.; Danger, G. +8 more
The origin of cometary volatiles remains a major open question in planetary science. Comets may have either agglomerated from crystalline ices condensed in the protosolar nebula (PSN) or from amorphous ice originating from the molecular cloud and interstellar medium. Here, based on the recent argon, krypton, and xenon measurements performed by the…
A planetary-scale disturbance in a long living three vortex coupled system in Saturn's atmosphere
Hueso, R.; Sánchez-Lavega, A.; Rojas, J. F. +11 more
The zonal wind profile of Saturn has a unique structure at 60°N with a double-peaked jet that reaches maximum zonal velocities close to 100 ms-1. In this region, a singular group of vortices consisting of a cyclone surrounded by two anticyclones was active since 2012 until the time of this report. Our observation demonstrates that vorti…
The Data-Driven Approach to Spectroscopic Analyses
Ness, M.
I review the data-driven approach to spectroscopy, The Cannon, which is a method for deriving fundamental diagnostics of galaxy formation of precise chemical compositions and stellar ages, across many stellar surveys that are mapping the Milky Way. With The Cannon, the abundances and stellar parameters from the multitude of stellar surveys can be …
The Spectral Energy Distribution of the Hyperluminous, Hot Dust-obscured Galaxy W2246-0526
Shu, Xinwen; Knudsen, Kirsten K.; Fan, Lulu +1 more
Hot dust-obscured galaxies (Hot DOGs) are a luminous, dust-obscured population recently discovered in the WISE All-Sky survey. Multiwavelength follow-up observations suggest that they are mainly powered by accreting supermassive black holes (SMBHs), lying in dense environments, and being in the transition phase between extreme starburst and UV-bri…
Fermi Transient J1544-0649: A Flaring Radio-weak BL Lac
Ubertini, Pietro; Bazzano, Angela; Panessa, Francesca +6 more
On 2017 May 15, the FERMI/LAT gamma-ray telescope observed a transient source not present in any previous high-energy catalog: J1544-0649. It was visible for two consecutive weeks, with a flux peak on May 21. Subsequently observed by a Swift/XRT follow-up starting on May 26, the X-ray counterpart position was coincident with the optical transient …