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Estimating the Contribution of Foreground Halos to the FRB 180924 Dispersion Measure
Simha, Sunil; Prochaska, J. Xavier; Ryder, Stuart D. +6 more
Fast radio burst (FRB) dispersion measures (DMs) record the presence of ionized baryons that are otherwise invisible to other techniques enabling resolution of the matter distribution in the cosmic web. In this work, we aim to estimate the contribution to FRB 180924 DM from foreground galactic halos. Localized by ASKAP to a massive galaxy, this si…
Deep Chandra observations of diffuse hot plasma in M83
Wang, Q. Daniel; Ji, Li; Bogdán, Ákos +1 more
It is widely believed that galaxy formation and evolution is regulated by stellar mechanical feedback in forms of fast stellar winds and supernova explosions. However, the coupling of this feedback with the interstellar medium remains poorly understood. We examine how the coupling may be traced by diffuse soft X-ray emission in M83 - a nearby face…
An Atacama Large Millimeter/submillimeter Array Survey of Chemistry in Disks around M4-M5 Stars
Pascucci, Ilaria; Wilner, David J.; Cleeves, L. Ilsedore +10 more
M-stars are the most common hosts of planetary systems in the Galaxy. Protoplanetary disks around M-stars thus offer a prime opportunity to study the chemistry of planet-forming environments. We present an Atacama Large Millimeter/submillimeter Array survey of molecular line emission toward a sample of five protoplanetary disks around M4-M5 stars …
Compact disks. An explanation to faint CO emission in Lupus disks
Williams, J. P.; Ansdell, M.; Facchini, S. +4 more
Context. ALMA disk surveys have shown that a large fraction of observed protoplanetary disks in nearby star-forming regions (SFRs) are fainter than expected in CO isotopolog emission. Disks not detected in 13CO line emission are also faint and often unresolved in the continuum emission at an angular resolution of around 0.2 arcsec.
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Preparing for LSST data. Estimating the physical properties of z < 2.5 main-sequence galaxies
Shirley, R.; Buat, V.; Boquien, M. +8 more
Aims: We study how the upcoming Legacy Survey of Space and Time (LSST) data from the Vera C. Rubin Observatory can be employed to constrain the physical properties of normal star-forming galaxies (main-sequence galaxies). Because the majority of the observed LSST objects will have no auxiliary data, we use simulated LSST data and existing rea…
Interstellar Extinction, Polarization, and Grain Alignment in the Sh 2-185 (IC 59 and IC 63) Region
Soam, Archana; Andersson, B. -G.; Acosta-Pulido, J. A. +6 more
Optical and infrared continuum polarization from the interstellar medium is driven by radiative processes aligning the grains with the magnetic field. While a quantitative, predictive theory of radiative alignment torques (RATs) exists and has been extensively tested, several parameters of the theory remain to be fully constrained. In a recent pap…
Electron temperature fluctuations in Seyfert galaxies
Riffel, Rogemar A.; Esteban, César; Dors, Oli L. +1 more
We use Gemini GMOS-IFU observations of three luminous nearby Seyfert galaxies (Mrk 79, Mrk 348, and Mrk 607) to estimate the electron temperature (Te) fluctuations in the inner 0.4-1.1 kpc region of these galaxies. Based on Te determinations through the [O III]λ5007/λ4363 emission line ratio of each spaxel, temperature variat…
Highly Structured Inner Planetary System Debris around the Intermediate Age Sun-like Star TYC 8830 410 1
Weinberger, Alycia J.; Song, Inseok; Olofsson, Johan +4 more
We present a detailed characterization of the extremely dusty main-sequence star TYC 8830 410 1. This system hosts inner planetary system dust (T dust ≈ 300 K) with a fractional infrared luminosity of ~1%. Mid-infrared spectroscopy reveals a strong, mildly crystalline solid-state emission feature. TYC 8830 410 1 (spectral type G9 V) has…
Past, present and future stars that can see Earth as a transiting exoplanet
Kaltenegger, L.; Faherty, J. K.
In the search for life in the cosmos, transiting exoplanets are currently our best targets. With thousands already detected, our search is entering a new era of discovery with upcoming large telescopes that will look for signs of `life' in the atmospheres of transiting worlds. Previous work has explored the zone from which Earth would be visible w…
Search for dormant black holes in ellipsoidal variables - III. The OGLE BULGE short-period sample
Gomel, Roy; Faigler, Simchon; Mazeh, Tsevi +1 more
This is the third of a series of papers that presents an algorithm to search for close binaries with massive, possibly compact, unseen secondaries. The detection of such a binary is based on identifying a star that displays a large ellipsoidal periodic modulation, induced by tidal interaction with its companion. In the second paper of the series, …