Search Publications
A MeerKAT 1.28 GHz Atlas of Southern Sources in the IRAS Revised Bright Galaxy Sample
Marchetti, L.; Jarrett, T.; Moloko, M. E. +4 more
The IRAS Revised Bright Galaxy Sample (RBGS) comprises galaxies and unresolved mergers stronger than S = 5.24 Jy at λ = 60 µm with Galactic latitudes ∣b∣ > 5°. Nearly all are dusty star-forming galaxies whose radio continuum and far-infrared luminosities are proportional to their current rates of star formation. We used the MeerKAT array …
SpiKeS: Precision Warm Spitzer Photometry of the Kepler Field
Gorjian, Varoujan; Stark, Christopher C.; Lowrance, Patrick J. +11 more
The ∼200,000 targets monitored for photometric variability during the Kepler prime mission include the best-studied group of stars in the sky, due both to the extensive time history provided by Kepler and to the substantial amount of ancillary data provided by other investigators or compiled by the Kepler team. To complement this wealth of data, w…
A Grid of Synthetic Spectra for Subdwarfs: Non-LTE Line-blanketed Atmosphere Models
Diaz, Marcos P.; Levenhagen, Ronaldo S.; Coelho, Paula R. T. +1 more
A new grid of detailed atmosphere model spectra for hot and moderately cool subdwarf stars is presented. High-resolution spectra and synthetic photometry are calculated in the range from 1000-10,000 Å using non-LTE fully line-blanketed atmosphere structures. Our grid covers eight temperatures within 10,000 ≤ Teff [K] ≤ 65,000, three sur…
Identification of Single Spectral Lines in Large Spectroscopic Surveys Using UMLAUT: an Unsupervised Machine-learning Algorithm Based on Unbiased Topology
Rodighiero, G.; Vaccari, M.; Battisti, A. +19 more
The identification of an emission line is unambiguous when multiple spectral features are clearly visible in the same spectrum. However, in many cases, only one line is detected, making it difficult to correctly determine the redshift. We developed a freely available unsupervised machine-learning algorithm based on unbiased topology (UMLAUT) that …
An Entropy-stable Ideal EC-GLM-MHD Model for the Simulation of the Three-dimensional Ambient Solar Wind
Feng, Xueshang; Wei, Fengsi; Li, Caixia
The main aim of the current work is to apply the Roe+Lax-Friedrichs (LF) hybrid entropy-stable scheme to the simulation of the three-dimensional ambient solar wind. The governing equations for the solar wind flow and magnetic field utilize the entropy-consistent nine-wave magnetic field divergence diminishing ideal magnetohydrodynamics (MHD) equat…
An XMM-Newton Early-type Galaxy Atlas
Trinchieri, Ginevra; Lauer, Jennifer; Fabbiano, Giuseppina +9 more
The distribution of hot interstellar medium in early-type galaxies (ETGs) bears the imprint of the various astrophysical processes it underwent during its evolution. The X-ray observations of these galaxies have identified various structural features related to active galactic nucleus (AGN) and stellar feedback and environmental effects such as me…
The Araucaria Project: Deep Near-infrared Photometric Maps of Local and Sculptor Group Galaxies. I. Carina, Fornax, and Sculptor
Gieren, Wolfgang; Pietrzyński, Grzegorz; Pilecki, Bogumił +12 more
Deep near-infrared (NIR) J- and K-band photometry of three Local Group dwarf spheroidal galaxies—Fornax, Carina, and Sculptor—is made available for the community. Until now, these data have only been used by the Araucaria Project to determine distances using the tip of the red giant branch and RR Lyrae stars. Now, we present the entire data collec…
Using CME Progenitors to Assess CME Geoeffectiveness
Martens, Petrus; Aparna, V.; Mundra, Kashvi
There have been a few previous studies claiming that the effects of geomagnetic storms strongly depend on the orientation of the magnetic cloud portion of coronal mass ejections (CMEs). Aparna & Martens, using halo-CME data from 2007 to 2017, showed that the magnetic field orientation of filaments at the location where CMEs originate on the Su…
MG1-688432: A Peculiar Variable System
Corbally, Christopher J.; Kraus, Adam L.; Tucker, Roy A. +3 more
The short-period variable star MG1-688432 has been discovered to exhibit occasional extremely high energy optical outbursts as high as 1038 erg. Outbursts are typically several hours in duration. These events are often highly structured, resembling sequential associated releases of energy. Twenty years of time sequence photometry are pr…
Erratum: "Cassini Composite Infrared Spectrometer (CIRS) Observations of Titan 2004-2017" (2019, ApJS, 244, 14)
Bézard, Bruno; Vinatier, Sandrine; Lellouch, Emmanuel +16 more