Search Publications
Missions
Journals
Publication Years
A hierarchical model for the ages of Galactic halo white dwarfs
Si, Shijing; van Dyk, David A.; von Hippel, Ted +3 more
In astrophysics, we often aim to estimate one or more parameters for each member object in a population and study the distribution of the fitted parameters across the population. In this paper, we develop novel methods that allow us to take advantage of existing software designed for such case-by-case analyses to simultaneously fit parameters of b…
Herschel/SPIRE observations of water production rates and ortho-to-para ratios in comets★
Swinyard, Bruce M.; Wilson, Thomas G.; Rawlings, Jonathan M. C.
This paper presents Herschel/SPIRE (Spectral and Photometric Imaging Receiver) spectroscopic observations of several fundamental rotational ortho- and para-water transitions seen in three Jupiter-family comets and one Oort-cloud comet. Radiative transfer models that include excitation by collisions with neutrals and electrons, and by solar infrare…
The NGC 454 system: anatomy of a mixed ongoing merger
Plana, H.; Marino, A.; Mazzei, P. +3 more
This paper focuses on NGC 454, a nearby interacting pair of galaxies (AM 0112-554, RR23), composed of an early-type (NGC 454 E) and a star-forming late-type companion (NGC 454 W). We aim at characterizing this wet merger candidate via a multi-λ analysis, from near-UV (NUV) to optical using Swift UV/Optical Telescope (UVOT), and mapping the H α int…
The Spiral Arm Segments of the Galaxy within 3 kpc from the Sun: A Statistical Approach
Hou, Li-Gang; Jiang, Ing-Guey; Griv, Evgeny
As can be reasonably expected, upcoming large-scale APOGEE, GAIA, GALAH, LAMOST, and WEAVE stellar spectroscopic surveys will yield rather noisy Galactic distributions of stars. In view of the possibility of employing these surveys, our aim is to present a statistical method to extract information about the spiral structure of the Galaxy from curr…
A transient, flat spectrum radio pulsar near the Galactic Centre
Degenaar, N.; Kerr, M.; Kramer, M. +6 more
Recent studies have shown possible connections between highly magnetized neutron stars ('magnetars'), whose X-ray emission is too bright to be powered by rotational energy, and ordinary radio pulsars. In addition to the magnetar SGR J1745-2900, one of the radio pulsars in the Galactic Centre (GC) region, PSR J1746-2850, had timing properties imply…
The Circumgalactic Medium of Submillimeter Galaxies. II. Unobscured QSOs within Dusty Starbursts and QSO Sightlines with Impact Parameters below 100 kpc
Casey, Caitlin M.; Prochaska, J. Xavier; Scoville, Nick +4 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) 870 µm observations of 29 bright Herschel sources near high-redshift QSOs. The observations confirm that 20 of the Herschel sources are submillimeter-bright galaxies (SMGs) and identify 16 new SMG-QSO pairs that are useful to studies of the circumgalactic medium (CGM) of SMGs. Ei…
A multi-observatory database of X-ray pulsars in the Magellanic Clouds
Zezas, A.; Antoniou, V.; Coe, M. J. +5 more
Using hundreds of XMM-Newton and Chandra archival observations and nearly a thousand RXTE observations, we have generated a comprehensive library of the known pulsars in the Small and Large Magellanic Clouds (SMC and LMC). The pulsars are detected multiple times across the full parameter spaces of X-ray luminosity (LX = 1031 - 38
Performance of an Algorithm for Estimation of Flux, Background, and Location on One-dimensional Signals
Busonero, D.; Cancelliere, R.; Gai, M.
Optimal estimation of signal amplitude, background level, and photocenter location is crucial to the combined extraction of astrometric and photometric information from focal plane images, in particular from the one-dimensional measurements performed by Gaia on intermediate to faint magnitude stars. Our goal is to define a convenient maximum likel…
An XMM-Newton Study of the Mixed-morphology Supernova Remnant G346.6-0.2
Auchettl, Katie; Slane, Patrick; Ng, C. -Y. +2 more
We present an X-ray imaging and spectroscopic study of the molecular cloud interacting mixed-morphology supernova remnant G346.6-0.2 using XMM-Newton. The X-ray spectrum of the remnant is well described by a recombining plasma that most likely arises from adiabatic cooling and has subsolar abundances of Mg, Si, and S. Our fits also suggest the pre…
Optical Properties of Non-stoichiometric Amorphous Silicates with Application to Circumstellar Dust Extinction
Tamanai, Akemi; Pucci, Annemarie; Dohmen, Ralf +1 more
We determine the optical constants of non-stoichiometric amorphous magnesium-iron silicates and demonstrate that they can well reproduce the observed mid-infrared emission spectra of evolved stars. Stoichiometric and non-stoichiometric amorphous magnesium-iron silicate films are fabricated by pulsed laser deposition. Transmittance and ellipsometry…