R. Arcodia
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View article: The Advanced X-ray Imaging Satellite Community Science Book
The Advanced X-ray Imaging Satellite Community Science Book Open
The AXIS Community Science Book represents the collective effort of more than 500 scientists worldwide to define the transformative science enabled by the Advanced X-ray Imaging Satellite (AXIS), a next-generation X-ray mission selected by…
View article: Prospects for EMRI/MBH Parameter Estimation Using Quasiperiodic Eruption Timings: Short-timescale Analysis
Prospects for EMRI/MBH Parameter Estimation Using Quasiperiodic Eruption Timings: Short-timescale Analysis Open
Quasiperiodic eruptions (QPEs) are luminous, recurring X-ray outbursts from galactic nuclei, with timescales of hours to days. While their origin remains uncertain, leading models invoke accretion disk instabilities or the interaction of a…
View article: NICER observations reveal doubled timescales in Ansky's quasi-periodic eruptions (QPEs)
NICER observations reveal doubled timescales in Ansky's quasi-periodic eruptions (QPEs) Open
Quasi-periodic eruptions (QPEs) are recurring X-ray bursts originating from the vicinity of supermassive black holes, but their driving mechanisms remain under debate. This study analyzes new NICER observations of QPEs in Ansky (a transien…
View article: Prospects for EMRI/MBH parameter estimation using Quasi-Periodic Eruption timings: short-timescale analysis
Prospects for EMRI/MBH parameter estimation using Quasi-Periodic Eruption timings: short-timescale analysis Open
Quasi-Periodic Eruptions (QPEs) are luminous, recurring X-ray outbursts from galactic nuclei, with timescales of hours to days. While their origin remains uncertain, leading models invoke accretion disk instabilities or the interaction of …
View article: SRG/eROSITA No. 5: Discovery of Quasiperiodic Eruptions Every ∼3.7 days from a Galaxy at <i>z</i> > 0.1
SRG/eROSITA No. 5: Discovery of Quasiperiodic Eruptions Every ∼3.7 days from a Galaxy at <i>z</i> > 0.1 Open
Quasiperiodic eruptions (QPEs) are repeating soft-X-ray bursts from the nuclei of galaxies, tantalizingly proposed to be extreme-mass-ratio inspirals. Here, we report the discovery of a new galaxy showing X-ray QPEs, the fifth found throug…
View article: The eROSITA Final Equatorial Depth Survey (eFEDS): SDSS spectroscopic observations of X-ray sources
The eROSITA Final Equatorial Depth Survey (eFEDS): SDSS spectroscopic observations of X-ray sources Open
We present one of the largest uniform optical spectroscopic surveys of X-ray selected sources to date that were observed as a pilot study for the Black Hole Mapper (BHM) survey. The BHM program of the Sloan Digital Sky Survey (SDSS)-V is d…
View article: Rapidly Varying Ionization Features in a Quasi-periodic Eruption: A Homologous Expansion Model for the Spectroscopic Evolution
Rapidly Varying Ionization Features in a Quasi-periodic Eruption: A Homologous Expansion Model for the Spectroscopic Evolution Open
Quasi-periodic eruptions (QPEs) are recurring bursts of soft X-ray emission from supermassive black holes, which a growing class of models explains via extreme mass ratio inspirals (EMRIs). QPEs exhibit blackbody-like emission with signifi…
View article: The eROSITA Final Equatorial Depth Survey (eFEDS)
The eROSITA Final Equatorial Depth Survey (eFEDS) Open
We present one of the largest uniform optical spectroscopic surveys of X-ray selected sources to date that were observed as a pilot study for the Black Hole Mapper (BHM) survey. The BHM program of the Sloan Digital Sky Survey (SDSS)-V is d…
View article: Discovery of Quasiperiodic Eruptions in the Tidal Disruption Event and Extreme Coronal Line Emitter AT2022upj: Implications for the QPE/TDE Fraction and a Connection to ECLEs
Discovery of Quasiperiodic Eruptions in the Tidal Disruption Event and Extreme Coronal Line Emitter AT2022upj: Implications for the QPE/TDE Fraction and a Connection to ECLEs Open
Quasiperiodic eruptions (QPEs) are recurring soft X-ray transients emerging from the vicinity of supermassive black holes in nearby, low-mass galaxy nuclei; about 10 QPE hosts have been identified thus far. Here we report the NICER discove…
View article: Discovery of two new polars evolved past the period bounce
Discovery of two new polars evolved past the period bounce Open
We report the discovery of two new magnetic cataclysmic variables with brown dwarf companions and long orbital periods ($P_{\rm orb}$ = $95\pm 1$ and $104\pm 2$ min). This discovery increases the sample of candidate magnetic period bouncer…
View article: Discovery of Quasi-periodic Eruptions in the Tidal Disruption Event and Extreme Coronal Line Emitter AT2022upj: implications for the QPE/TDE fraction and a connection to ECLEs
Discovery of Quasi-periodic Eruptions in the Tidal Disruption Event and Extreme Coronal Line Emitter AT2022upj: implications for the QPE/TDE fraction and a connection to ECLEs Open
Quasi-periodic eruptions (QPEs) are recurring soft X-ray transients emerging from the vicinity of supermassive black holes (SMBHs) in nearby, low-mass galaxy nuclei; about ten QPE hosts have been identified thus far. Here we report the \te…
View article: Millihertz oscillations near the innermost orbit of a supermassive black hole
Millihertz oscillations near the innermost orbit of a supermassive black hole Open
View article: Time-resolved Hubble Space Telescope UV Observations of an X-Ray Quasiperiodic Eruption Source
Time-resolved Hubble Space Telescope UV Observations of an X-Ray Quasiperiodic Eruption Source Open
X-ray quasiperiodic eruptions (QPEs) are a novel mode of variability in nearby galactic nuclei whose origin remains unknown. Their multiwavelength properties are poorly constrained, as studies have focused almost entirely on the X-ray band…
View article: Time-Resolved Hubble Space Telescope UV Observations of an X-Ray Quasi-Periodic Eruption Source
Time-Resolved Hubble Space Telescope UV Observations of an X-Ray Quasi-Periodic Eruption Source Open
X-ray quasi-periodic eruptions (QPEs) are a novel mode of variability in nearby galactic nuclei whose origin remains unknown. Their multi-wavelength properties are poorly constrained, as studies have focused almost entirely on the X-ray ba…
View article: QPEs as Lense-Thirring precession of super-Eddington flows
QPEs as Lense-Thirring precession of super-Eddington flows Open
Quasi-periodic eruptions (QPEs) are a recently identified class of X-ray transient associated with tidal disruption events by supermassive black holes, and for which there are multiple possible explanations. In this paper we present a simp…
View article: Quasi-periodic eruptions as Lense–Thirring precession of super-Eddington flows
Quasi-periodic eruptions as Lense–Thirring precession of super-Eddington flows Open
Quasi-periodic eruptions (QPEs) are a recently identified class of X-ray transient associated with tidal disruption events by supermassive black holes, and for which there are multiple possible explanations. In this paper, we present a sim…
View article: Millihertz Oscillations Near the Innermost Orbit of a Supermassive Black Hole
Millihertz Oscillations Near the Innermost Orbit of a Supermassive Black Hole Open
Recent discoveries from time-domain surveys are defying our expectations for how matter accretes onto supermassive black holes (SMBHs). The increased rate of short-timescale, repetitive events around SMBHs, including the newly-discovered q…
View article: The Lunar Gravitational-wave Antenna: mission studies and science case
The Lunar Gravitational-wave Antenna: mission studies and science case Open
The Lunar Gravitational-wave Antenna (LGWA) is a proposed array of next-generation inertial sensors to monitor the response of the Moon to gravitational waves (GWs). Given the size of the Moon and the expected noise produced by the lunar s…
View article: The radio properties of quasi-periodic X-ray eruption sources
The radio properties of quasi-periodic X-ray eruption sources Open
Quasi-periodic X-ray eruptions (QPEs) are a new class of repeating nuclear transient in which repeating X-ray flares are observed coming from the nuclei of generally low-mass galaxies. Here, we present a comprehensive summary of the radio …
View article: Detection of a Highly Ionized Outflow in the Quasiperiodically Erupting Source GSN 069
Detection of a Highly Ionized Outflow in the Quasiperiodically Erupting Source GSN 069 Open
Quasiperiodic eruptions (QPEs) are high-amplitude, soft X-ray bursts recurring every few hours, associated with supermassive black holes. Many interpretations for QPEs were proposed since their recent discovery in 2019, including extreme m…
View article: eRO-ExTra: eROSITA extragalactic non-AGN X-ray transients and variables in eRASS1 and eRASS2
eRO-ExTra: eROSITA extragalactic non-AGN X-ray transients and variables in eRASS1 and eRASS2 Open
Aims . The eROSITA telescope aboard the Spectrum Roentgen Gamma (SRG) satellite provides an unprecedented opportunity to explore the transient and variable extragalactic X-ray sky due to the sensitivity, sky coverage, and cadence of the al…
View article: Eppur si muove: Evidence of disc precession or a sub-milliparsec SMBH binary in the QPE-emitting galaxy GSN 069
Eppur si muove: Evidence of disc precession or a sub-milliparsec SMBH binary in the QPE-emitting galaxy GSN 069 Open
X-ray quasi-periodic eruptions (QPEs) are intense soft X-ray bursts from the nuclei of nearby low-mass galaxies typically lasting about one hour and repeating every few. Their physical origin remains debated, although so-called impacts mod…
View article: Fragments of harmony amid apparent chaos: A closer look at the X-ray quasi-periodic eruptions of the galaxy RX J1301.9+2747
Fragments of harmony amid apparent chaos: A closer look at the X-ray quasi-periodic eruptions of the galaxy RX J1301.9+2747 Open
Quasi-periodic eruptions (QPEs) are an extreme X-ray variability phenomenon associated with low-mass ( M B H < 10 7 M ⊙ ) supermassive black holes (SMBHs). First discovered in the nucleus of the galaxy GSN 069, they have been so far secure…
View article: Prospects for Time-Domain and Multi-Messenger Science with AXIS
Prospects for Time-Domain and Multi-Messenger Science with AXIS Open
The Advanced X-ray Imaging Satellite (AXIS) promises revolutionary science in the X-ray and multi-messenger time domain. AXIS will leverage excellent spatial resolution (<1.5 arcsec), sensitivity (80× that of Swift), and a large collecting…
View article: X-Ray Quasi-periodic Eruptions and Tidal Disruption Events Prefer Similar Host Galaxies
X-Ray Quasi-periodic Eruptions and Tidal Disruption Events Prefer Similar Host Galaxies Open
In the past 5 yr, six X-ray quasi-periodic eruption (QPE) sources have been discovered in the nuclei of nearby galaxies. Their origin remains an open question. We present Multi Unit Spectroscopic Explorer integral field spectroscopy of fiv…
View article: Ticking away: the long-term X-ray timing and spectral evolution of eRO-QPE2
Ticking away: the long-term X-ray timing and spectral evolution of eRO-QPE2 Open
Quasi-periodic eruptions (QPEs) are repeated X-ray flares from galactic nuclei. Despite some diversity in the recurrence and amplitude of eruptions, their striking regularity has motivated theorists to associate QPEs with orbital systems. …
View article: Detection of a Highly Ionized Outflow in the Quasi-periodically Erupting Source GSN 069
Detection of a Highly Ionized Outflow in the Quasi-periodically Erupting Source GSN 069 Open
Quasi-periodic eruptions (QPEs) are high-amplitude, soft X-ray bursts recurring every few hours, associated with supermassive black holes. Many interpretations for QPEs were proposed since their recent discovery in 2019, including extreme …
View article: Quasi-periodic X-ray eruptions and tidal disruption events prefer similar host galaxies
Quasi-periodic X-ray eruptions and tidal disruption events prefer similar host galaxies Open
In the past five years, six quasi-periodic X-ray eruption (QPE) sources have been discovered in the nuclei of nearby galaxies. Their origin remains an open question. We present MUSE integral field spectroscopy of five QPE host galaxies to …
View article: The Lunar Gravitational-wave Antenna: Mission Studies and Science Case
The Lunar Gravitational-wave Antenna: Mission Studies and Science Case Open
The Lunar Gravitational-wave Antenna (LGWA) is a proposed array of next-generation inertial sensors to monitor the response of the Moon to gravitational waves (GWs). Given the size of the Moon and the expected noise produced by the lunar s…
View article: Winds of change: The nuclear and galaxy-scale outflows and the X-ray variability of 2MASS 0918+2117
Winds of change: The nuclear and galaxy-scale outflows and the X-ray variability of 2MASS 0918+2117 Open
Context. In this work, we test feedback propagation models on the test case of 2MASS 0918+2117 (2M0918), a z = 0.149 X-ray variable AGN that shows tentative evidence for nuclear ultra-fast outflows (UFOs) in a 2005 XMM-Newton observation. …