Search Publications
Soft X-Ray Excess from Shocked Black Hole Accretion
Fukumura, Keigo; Przybylek, Jeff
A certain class of luminous galaxies hosting supermassive black holes (BHs) is known to exhibit an excess of "soft X-rays" in their X-ray spectra. However, its physical identity and origin are yet to be understood. In this work, we systematically study a sample of 9 well-documented narrow-line Seyfert 1 active galactic nuclei by utilizing the arch…
X-Ray and Optical Observations of the Young M Dwarf Dipper Star TIC 234284556
Montet, Benjamin T.; Feinstein, Adina D.; Poppenhaeger, Katja +2 more
We observed TIC 234284556 in X-rays and in the optical with XMM-Newton to study the recurring dip previously seen in TESS observations. The dip did not appear during our observation. We detect X-ray flares and anti-correlated rotational modulation in X-rays and in the optical.
X-Ray and Ultraviolet Observations of the Eclipsing Binary V471 Tauri with XMM-Newton: X-Ray-Cycles, Eclipse Timings and Further Evidence of a Substellar Tertiary Companion
Guinan, Edward; Engle, Scott; Ribas, Ignasi +2 more
Few stars offer as much toward understanding fundamental aspects of stellar astrophysics and binary star evolution than the eclipsing binary V471 Tauri (DAZ+K2V; P = 12.52 hr). V471 Tauri (Tau) is the product of common-envelope binary evolution and a pre-cataclysmic variable. X-ray and UV (291 nm) observations were secured with XMM-Newton over ~ 6…
Catalog of X-Ray Detected Be Stars (XDBS)
Kargaltsev, Oleg; Yang, Hui; Hare, Jeremy +2 more
We present a catalog of X-ray Detected Be Stars (XDBS) with 161 Be stars from the Be Star Spectra (BeSS) database having X-ray counterparts in the Chandra Source Catalog v2.0, XMM-Newton 4XMM-DR11 Catalog, or Swift 2SXPS Catalog. The multi-wavelength catalog includes accurate optical positions, X-ray properties (fluxes, photon indices and hardness…
Multiwavelength Properties of the Newly Discovered Dwarf Nova ASASSN-21kt
Sokolovsky, Kirill V.; Mukai, Koji; Lopes de Oliveira, Raimundo +1 more
We report on archival XMM-Newton and post-outburst Swift observations of the newly discovered dwarf nova ASASSN-21kt. Its pre-outburst X-ray emission is consistent with that of a collisionally ionized, thermal plasma with ${kT}={8.1}_{-2.5}^{+10.2}$ keV and LX 0.2-12 keV = 7 × 1032 erg s-1, with no clear modulation…
Non-detection of M60-UCD1 in Quasi-simultaneous X-Ray and Radio Observations
Jonker, Peter G.; Lena, Davide; Miller-Jones, James C. A. +1 more
Simultaneous detection in X-rays and radio, following the proportionality implied by the "fundamental plane of black hole activity," can indicate the presence of an accreting black hole (BH), allowing a rough estimate of its mass. We used the XMM-Newton satellite and the Karl G. Jansky Very Large Array to perform quasi-simultaneous observations (w…