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The Isotropic Interplanetary Dust Cloud and Near-infrared Extragalactic Background Light Observed with COBE/DIRBE
Matsuura, S.; Sano, K.; Yomo, K. +1 more
We report observation of isotropic interplanetary dust (IPD) by analyzing the infrared (IR) maps of the Diffuse Infrared Background Experiment (DIRBE) on board the Cosmic Background Explorer (COBE) spacecraft. To search for the isotropic IPD, we perform new analysis in terms of the solar elongation angle (ɛ), because we expect the zodiacal light (…
RELICS: A Very Large (θE ∼ 40″) Cluster Lens—RXC J0032.1+1808
Ouchi, Masami; Mahler, Guillaume; Bradač, Maruša +38 more
Extensive surveys with the Hubble Space Telescope over the past decade, targeting some of the most massive clusters in the sky, have uncovered dozens of galaxy cluster strong lenses. The massive cluster strong-lens scale is typically θE ∼ 10″ to ∼30″-35″, with only a handful of clusters known with Einstein radii θE ∼ 40″ or a…
Properties of Galactic B[e] Supergiants. V. 3 Pup-Constraining the Orbital Parameters and Modeling the Circumstellar Environments
Miroshnichenko, A. S.; Manset, N.; Zharikov, S. V. +9 more
We report the results of long-term spectroscopic monitoring of the A-type supergiant with the B[e] phenomenon 3 Pup = HD 62623. We confirm earlier findings that it is a binary system. The orbital parameters were derived using cross-correlation of the spectra in a range of 4460-4632 Å, which contains over 30 absorption lines. The orbit was found to…
The Ultraluminous X-Ray Sources Population of the Galaxy NGC 7456
Salvaterra, R.; Haberl, F.; Tiengo, A. +28 more
Ultraluminous X-ray sources (ULXs) are a class of accreting compact objects with X-ray luminosities above 1039 erg s-1. The ULX population counts several hundred objects but only a fraction are well studied. Here we present a detailed analysis of all ULXs hosted in the galaxy NGC 7456. It was observed in X-rays only once in t…
A More Efficient Search for H2O Megamaser Galaxies: The Power of X-Ray and Mid-infrared Photometry
Chang, Y. -Y.; Cunha, E. da; Matsushita, S. +10 more
We present an investigation of the dependence of H2O maser detection rates and properties on the mid-IR active galactic nucleus (AGN) luminosity, LAGN, and the obscuring column density, NH, based on mid-IR and hard X-ray photometry. Based on spectral energy distribution fitting that allows for decomposition of the …
Newly Improved Ionization Corrections for the Neutral Interstellar Medium: Enabling Accurate Abundance Determinations in Star-forming Galaxies throughout the Universe
Hernandez, Svea; Aloisi, Alessandra; James, Bethan L. +4 more
Studies measuring the chemical abundances of the neutral gas in star-forming galaxies (SFGs) require ionization correction factors (ICFs) to accurately measure their metal contents. In the work presented here, we calculate newly improved ICFs for a sample of SFGs. These new corrections include both the contaminating ionized gas along the line of s…
The High Helium Abundance and Charge States of the Interplanetary CME and Its Material Source on the Sun
Harrison, R. A.; Davies, J. A.; Barnes, D. +5 more
Identifying the source of the material within coronal mass ejections (CMEs) and understanding CME onset mechanisms are fundamental issues in solar and space physics. Parameters relating to plasma composition, such as charge states and He abundance (AHe), may be different for plasmas originating from differing processes or regions on the…
Hot Subdwarf All Southern Sky Fast Transit Survey with the Evryscope
Law, Nicholas M.; Németh, Péter; Glazier, Amy +6 more
We have conducted a survey of candidate hot subdwarf (HSD) stars in the southern sky searching for fast transits, eclipses, and sinusoidal-like variability in the Evryscope light curves. The survey aims to detect transit signals from Neptune-size planets to gas giants, and eclipses from M-dwarfs and brown dwarfs. The other variability signals are …
On the Production of He+ of Solar Origin in the Solar Wind
Landi, Enrico; Rivera, Yeimy J.; Lepri, Susan T. +1 more
Solar wind measurements in the heliosphere predominantly comprise protons, alphas, and minor elements in a highly ionized state. The majority of low-charge states, such as He+, measured in situ are often attributed to pick-up ions of nonsolar origin. However, through inspection of the velocity distribution functions of near-Earth measur…
Detection of Pb II in the Ultraviolet Spectra of Three Metal-poor Stars
Beers, Timothy C.; Placco, Vinicius M.; Holmbeck, Erika M. +8 more
We report the first detection of the Pb II line at 2203.534 Šin three metal-poor stars, using ultraviolet spectra obtained with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope. We perform a standard abundance analysis assuming local thermodynamic equilibrium (LTE) to derive lead (Pb, Z = 82) abundances. The Pb II line …