Kavli Affiliate: David P. Huenemoerder | First 5 Authors: David P. Huenemoerder, David P. Huenemoerder, , , | Summary: We present 197 ks HETG and 95 ks NuSTAR spectra of the $gamma,$Cas-type object V750 Ara. The high-resolution X-ray spectra show that the target is similar to other objects of this class. Data are interpreted under […]
Kavli Affiliate: Robert A. Simcoe | First 5 Authors: Dominika Ďurovčíková, Dominika Ďurovčíková, , , | Summary: Measurements of quasar lifetimes at high redshift indicate that the earliest billion-solar-mass supermassive black holes (SMBHs) have only been active as luminous quasars for less than a million years. Recently, extended Ly$alpha$ nebulae around $zsim6$ quasars have revealed […]
Kavli Affiliate: Erin Kara | First 5 Authors: Laura W. Brenneman, Laura W. Brenneman, , , | Summary: We present a time-averaged spectral analysis of the 2024 XRISM observation of the narrow-line Seyfert-1 galaxy MCG–6-30-15, taken contemporaneously with XMM-Newton and NuSTAR. Our analysis leverages a unique combination of broadband and high-resolution X-ray spectroscopy to definitively […]
Kavli Affiliate: Erin Kara | First 5 Authors: Peter Kosec, Peter Kosec, , , | Summary: X-ray binary accretion disk winds can carry away a significant fraction of the originally infalling matter and hence strongly affect the accretion flow and the long-term evolution of the binary system. However, accurate measurements of their mass outflow rates […]
Kavli Affiliate: Jacqueline N. Hewitt | First 5 Authors: Kai-Feng Chen, Kai-Feng Chen, , , | Summary: Observations of the redshifted 21-cm line during the Epoch of Reionization will open a new window to probe the intergalactic medium during the formation of the first stars, galaxies, and black holes. A particularly promising route to an […]
Kavli Affiliate: Sara Seager | First 5 Authors: Mathilde Mâlin, Mathilde Mâlin, , , | Summary: Young accreting planetary-mass objects are thought to draw material from a circumplanetary disk (CPD) composed of gas and dust. While the gas within the disk is expected to disperse within the first million years, strong accretion has nonetheless been […]
Kavli Affiliate: Erin Kara | First 5 Authors: XRISM Collaboration, XRISM Collaboration, , , | Summary: The dynamics of the intra-cluster medium (ICM), the hot plasma that fills galaxy clusters, are shaped by gravity-driven cluster mergers and feedback from supermassive black holes (SMBH) in the cluster cores. XRISM measurements of ICM velocities in several clusters […]
Kavli Affiliate: Salvatore Vitale | First 5 Authors: Noah E. Wolfe, Noah E. Wolfe, , , | Summary: From catalogs of gravitational-wave transients, the population-level properties of their sources and the formation channels of merging compact binaries can be constrained. However, astrophysical conclusions can be biased by misspecification or misestimation of the population likelihood. Despite […]
Kavli Affiliate: Herman L. Marshall | First 5 Authors: Unnati Kashyap, Unnati Kashyap, , , | Summary: We report the first polarimetric results of the neutron star (NS) low-mass X-ray binary (LMXB) Z-source GX 17+2 using the Imaging X-ray Polarimetry Explorer (IXPE) and the Very Large Array (VLA). We find that the X-ray source was […]
Kavli Affiliate: Mark Vogelsberger | First 5 Authors: Thales A. Gutcke, Thales A. Gutcke, , , | Summary: We present a detailed comparison of a Local Group dwarf galaxy analogue evolved in two cosmological models: the standard $Lambda$CDM and a self-interacting dark matter (SIDM) model with a velocity-dependent cross-section. Both simulations are run with the […]