Results 11 to 20 of about 37,338 (51)

Modeling of Radio Supernovae: Including the Effects of Inhomogeneities and Radiative Cooling

open access: yesThe Astrophysical Journal
The presence of inhomogeneities in a spatially unresolved source is often hard to establish. This limits the accuracy with which the source properties can be determined.
C.-I. Björnsson
doaj   +1 more source

Explaining the GWSkyNet-Multi Machine Learning Classifier Predictions for Gravitational-wave Events

open access: yesThe Astrophysical Journal
GWSkyNet-Multi is a machine learning model developed for the classification of candidate gravitational-wave events detected by the LIGO and Virgo observatories.
Nayyer Raza   +7 more
doaj   +1 more source

Exploring Neutral Hydrogen in Radio MOlecular Hydrogen Emission Galaxies (MOHEGs) and Prospects with the SKA

open access: yesThe Astrophysical Journal
Empirical studies of cold gas content are essential for comprehending the star formation activities and evolution in galaxies. However, it is not straightforward to understand these processes because they depend on various physical properties of the ...
Sai Wagh   +8 more
doaj   +1 more source

Binary Interaction Can Yield a Diversity of Circumstellar Media around Type II Supernova Progenitors

open access: yesThe Astrophysical Journal
Recent observations of supernovae (SNe) have indicated that a fraction of massive stars possess dense circumstellar medium (CSM) at the moment of their core collapses.
Tomoki Matsuoka, Ryo Sawada
doaj   +1 more source

AGN STORM 2. V. Anomalous Behavior of the C iv Light Curve of Mrk 817

open access: yesThe Astrophysical Journal
An intensive reverberation mapping campaign of the Seyfert 1 galaxy Mrk 817 using the Cosmic Origins Spectrograph on the Hubble Space Telescope revealed significant variations in the response of broad UV emission lines to fluctuations in the continuum ...
Y. Homayouni   +51 more
doaj   +1 more source

Highly Coherent Quasiperiodic Oscillations in the “Heartbeat” Black Hole X-Ray Binary IGR J17091–3624

open access: yesThe Astrophysical Journal
IGR J17091–3624 is a black hole X-ray binary (BHXB), often referred to as the “twin” of GRS 1915+105 because it is the only other known BHXB that can show exotic “heartbeat”-like variability that is highly structured and repeated.
Jingyi Wang   +15 more
doaj   +1 more source

GBT/Argus Observations of Molecular Gas in the Inner Regions of IC 342

open access: yesThe Astrophysical Journal
We report observations of the ground state transitions of ^12 CO, ^13 CO, C ^18 O, HCN, and HCO ^+ at 88–115 GHz in the inner region of the nearby galaxy IC 342.
Jialu Li   +11 more
doaj   +1 more source

Using JWST Transits and Occultations to Determine ∼1% Stellar Radii and Temperatures of Low-mass Stars

open access: yesThe Astrophysical Journal Letters
Using JWST observations of a primary transit and two secondary eclipses for GJ 1214b, we determine an eccentricity that is more precise than a decade of HARPS data, which enables us to measure the stellar density to 2.62%.
Alexandra S. Mahajan   +2 more
doaj   +1 more source

NGDEEP Epoch 1: Spatially Resolved Hα Observations of Disk and Bulge Growth in Star-forming Galaxies at z ∼ 0.6–2.2 from JWST NIRISS Slitless Spectroscopy

open access: yesThe Astrophysical Journal Letters
We study the H α equivalent width (EW(H α )) maps of 19 galaxies at 0.6 < z < 2.2 in the Hubble Ultra Deep Field using NIRISS slitless spectroscopy as part of the Next Generation Deep Extragalactic Exploratory Public Survey.
Lu Shen   +23 more
doaj   +1 more source

Linking Cause and Effect: Nanoscale Vibrational Spectroscopy of Space Weathering from Asteroid Ryugu

open access: yesThe Astrophysical Journal Letters
Airless bodies are subjected to space-weathering effects that modify the first few microns of their surface. Therefore, understanding their impact on the optical properties of asteroids is key to the interpretation of their color variability and infrared
Sylvain Laforet   +18 more
doaj   +1 more source

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