Explanipedia

Constraints on Diffuse X-Ray Emission from the TeV Halo Candidate HESS J1813-126 Open

K. L. Page, Ke Fang · 2025

Extended regions of very high-energy γ -ray emission associated with middle-aged pulsars have been found by γ -ray observatories. These regions, called TeV halos or pulsar halos, are thought to be created when energetic electrons from a pu…

Radiative response of nova ejecta to illumination variations in the post-outburst white dwarf: V1405 Cas 2021 Open

Remo Di Giacomo, S. N. Shore, U. Munari, P. Valisa, K. L. Page , et al. · 2025

Aims . The nebular stage is that interval in the expansion of classical nova ejecta when the transparency of the matter permits a comprehensive view of the structure of the ejecta. We aim to study the radiative response of nova ejecta to i…

Nine tidal disruption event candidates in eROSITA-DE DR1 discovered through supersoft X-ray selection Open

R. A. J. Eyles-Ferris, R. L. C. Starling, P. T. O’Brien, K. L. Page, P. A. Evans · 2025

Tidal disruption events (TDEs) are rare and diverse transients that occur when a star is torn apart by a supermassive black hole and accreted, which can result in a supersoft X-ray thermal transient. Here, we present nine TDE candidates id…

Evidence for an intrinsic luminosity–decay correlation in GRB radio afterglows Open

Samuel P. R. Shilling, S. R. Oates, Д. А. Канн, Jyoti C. Patel, J. Racusin , et al. · 2025

We present the discovery of a correlation, in a sample of 16 gamma-ray burst 8.5 GHz radio afterglows, between the intrinsic luminosity measured at 10 d in the rest frame, $L_{\mathrm{Radio,10\,d}}$, and the average rate of decay past this…

Observing the launch of an Eddington wind in the luminous Seyfert galaxy PG1211+143 Open

Ken Pounds, K. L. Page · 2025

The luminous narrow-line Seyfert galaxy PG1211+143 was the first non Broad Absorption Line (BAL) active galactic nucleus (AGN) to reveal a powerful ionized wind, based on early observations with the European Space Agency’s XMM–Newton X-ray…

Prompt periodicity in the GRB 211211A precursor: black-hole or magnetar engine? Open

Gavin P. Lamb, Thomas Baxter, Conor M. B. Omand, Dimple Dimple, Zoë McGrath , et al. · 2025

The merger origin long GRB 211211A was a class (re-)defining event. A precursor was identified with a $\sim 1$ s separation from the main burst, as well as a claimed candidate quasi-periodic oscillation (QPO) with a frequency $\sim 20$ Hz.…

Near-infrared spectroscopy of the recurrent nova M31N 2008-12a Open

D. P. K. Banerjee, T. R. Geballe, A. Evans, C. E. Woodward, K. L. Page , et al. · 2025

Near-infrared (NIR) 0.9–2.5 $\mu$m spectra of the remarkable recurrent nova (RN) M31N 2008-12a were obtained on days 6.3 and 10.3 after discovery of its 2024 outburst, and are the first NIR spectra of this object. The only prominent line s…

Simultaneous Multiwavelength Observations of the Repeating Fast Radio Burst FRB 20190520B with Swift and FAST Open

Zhen Yan, Wenfei Yu, K. L. Page, Jie Lin, Di Li , et al. · 2025

Among several dozen known repeating fast radio bursts, those precisely localized offer the best opportunities to explore their multiwavelength counterparts, which are key to uncovering their origins. Here we report our X-ray, ultraviolet (…

Constraints on diffuse X-ray Emission from the TeV halo Candidate HESS J1813-126 Open

David Joseph Guevel, K. L. Page, Kaya Mori, A. Y. Lien, Kwok Lung Fan · 2025

Extended regions of very high energy $γ$-ray emission associated with middle-aged pulsars have been found by $γ$-ray observatories. These regions, called TeV halos or pulsar halos, are thought to be created when energetic electrons from a …

Prompt Periodicity in the GRB 211211A Precursor: Black-hole or magnetar engine? Open

Gavin P. Lamb, Thomas Baxter, Conor M. B. Omand, Dimple Dimple, Zoë McGrath , et al. · 2025

The merger origin long GRB 211211A was a class (re-)defining event. A precursor was identified with a $\sim 1$ s separation from the main burst, as well as a claimed candidate quasi-periodic oscillation (QPO) with a frequency $\sim20$ Hz. …

Hydrodynamic Predictions for the Next Outburst of T Coronae Borealis: It Will Be the Brightest Classical or Recurrent Nova Ever Observed in X-Rays* Open

S. Starrfield, Maitrayee Bose, C. E. Woodward, C. Iliadis, W. R. Hix , et al. · 2025

T Coronae Borealis (TCrB) is a recurrent nova with recorded outbursts in 1866 and 1946 and possible outbursts in 1217 and 1787. It is predicted to explode again in 2025 or 2026 based on multiple observational studies. The system consists o…

Swift-BAT GUANO Follow-up of Gravitational-wave Triggers in the Third LIGO–Virgo–KAGRA Observing Run Open

Gayathri Raman, S. Ronchini, James DeLaunay, A. Tohuvavohu, J. A. Kennea , et al. · 2025

We present results from a search for X-ray/gamma-ray counterparts of gravitational-wave (GW) candidates from the third observing run (O3) of the LIGO–Virgo–KAGRA network using the Swift Burst Alert Telescope (Swift-BAT). The search include…

The ultraviolet luminosity function of star-forming galaxies between redshifts of 0.4 and 0.6 Open

K. L. Page, T. Dwelly, I. McHardy, N. Seymour, K. O. Mason , et al. · 2025

We combine ultraviolet imaging of the 13H survey field, taken with the XMM-Newton Optical Monitor telescope (XMM-OM) and the Neil Gehrels Swift Observatory Ultraviolet and Optical Telescope (UVOT) in the UVM2 band, to measure rest-frame ul…

Panning for gold with the Neil Gehrels Swift Observatory: an optimal strategy for finding the counterparts to gravitational wave events Open

R. A. J. Eyles-Ferris, P. A. Evans, A. A. Breeveld, S. B. Cenko, S. Dichiara , et al. · 2024

The LIGO, Virgo, and KAGRA (LVK) gravitational wave observatories are currently undertaking their O4 observing run offering the opportunity to discover new electromagnetic counterparts to gravitational wave events. We examine the capabilit…

Millinovae: A New Class of Transient Supersoft X-Ray Sources without a Classical Nova Eruption Open

P. Mróz, Krzysztof Król, Hélène Szegedi, Philip Charles, K. L. Page , et al. · 2024

Some accreting binary systems containing a white dwarf (such as classical novae or persistent supersoft sources) are seen to emit low-energy X-rays with temperatures of ∼ 10 6 K and luminosities exceeding 10 35 erg s −1 . These X-rays are …

Near-infrared spectroscopy of the LMC recurrent nova LMCN 1968-12a Open

A. Evans, D. P. K. Banerjee, T. R. Geballe, Abigail Polin, E. Y. Hsiao , et al. · 2024

We have obtained near-infrared (0.80–2.45 $\, \mu$m) spectra of the recurrent nova LMCN 1968-12a on two occasions during its 2024 August eruption. This is the first near-infrared spectroscopy of an extragalactic nova. The initial spectrum,…

Panning for gold with the Neil Gehrels Swift Observatory: an optimal strategy for finding the counterparts to gravitational wave events Open

R. A. J. Eyles-Ferris, P. A. Evans, A. A. Breeveld, S. B. Cenko, S. Dichiara , et al. · 2024

The LIGO, Virgo and KAGRA gravitational wave observatories are currently undertaking their O4 observing run offering the opportunity to discover new electromagnetic counterparts to gravitational wave events. We examine the capability of th…

Swift-BAT GUANO follow-up of gravitational-wave triggers in the third LIGO-Virgo-KAGRA observing run Open

Gayathri Raman, S. Ronchini, James DeLaunay, A. Tohuvavohu, J. A. Kennea , et al. · 2024

We present results from a search for X-ray/gamma-ray counterparts of gravitational-wave (GW) candidates from the third observing run (O3) of the LIGO-Virgo-KAGRA (LVK) network using the Swift Burst Alert Telescope (Swift-BAT). The search i…

Mixing of Hot Shocked Plasma with Cold Gas in Nova YZ Ret 2020 Open

Sharon Mitrani, Ehud Behar, J. J. Drake, Marina Orio, K. L. Page , et al. · 2024

The origin of bright X-ray emission lines that appear late in a nova eruption remains largely a puzzle. We present two high-resolution X-ray grating spectra of the classical nova YZ Ret, observed 77 and 115 days post-eruption, using XMM-Ne…

Low-redshift absorption in the Seyfert galaxy PG1211+143 – a distant inflow maintaining off-plane accretion or the gravitational redshift of matter orbiting the SMBH? Open

Ken Pounds, K. L. Page · 2024

The detection of a high-velocity (∼0.3c) inflow of highly ionized matter during an extended XMM–Newton observation of the luminous Seyfert galaxy PG1211+143 in 2014 provided the first direct evidence of a short-lived accretion event, and a…

A Photoionization Model for the Infrared Coronal Line Emission in the Classical Nova V1716 Scorpii Open

C. E. Woodward, Gargi Shaw, S. Starrfield, A. Evans, K. L. Page · 2024

A near-infrared spectrum of nova V1716 Scorpii (PNV J17224490-4137160), a recent bright ( mag), Fermi-LAT detected γ -ray source, was modeled using the photoionization code CLOUDY. Abundances were estimated for He, C, N, O, Si, Al,…

A Photoionization model for the Infrared Coronal Line Emission in the Classical Nova V1716 Scorpii Open

C. E. Woodward, Geoffrey B. Shaw, S. Starrfield, A. Evans, K. L. Page · 2024

A near-infrared spectrum of nova V1716 Scorpii (PNV J17224490-4137160), a recent bright (V_max = 7.3 mag), Fermi-LAT detected gamma-ray source, was modeled using the photoionization code CLOUDY. Abundances were estimated for He, C, N, O, S…

Swift/UVOT discovery of Swift J221951−484240: a UV luminous ambiguous nuclear transient Open

S. R. Oates, N. P. M. Kuin, M. Nicholl, F. E. Marshall, E. J. Ridley , et al. · 2024

We report the discovery of Swift J221951−484240 (hereafter: J221951), a luminous slow-evolving blue transient that was detected by the Neil Gehrels Swift Observatory Ultraviolet/Optical Telescope (Swift/UVOT) during the follow-up of gravit…

Simultaneous multi-wavelength observations of the repeating fast radio burst FRB 20190520B with Swift and FAST Open

Zhen Yan, Wenfei Yu, K. L. Page, Jie Lin, Di Li , et al. · 2024

Among several dozen known repeating Fast radio bursts (FRBs), those precisely localized offer the best opportunities to explore their multi-wavelength counterparts, which are key to uncovering their origins. Here we report our X-ray, ultra…

EXTRAORDINARY LUMINOUS SOFT X-RAY TRANSIENT MAXI J0158–744 AS AN IGNITION OF A NOVA ON A VERY MASSIVE O-Ne WHITE DWARF Open

M. Morii, H. Tomida, Minoru Kimura, F. Suwa, H. Negoro , et al. · 2024

We present the observation of an extraordinary luminous soft X-ray transient, MAXI J0158-744, by the Monitor of All-sky X-ray Image (MAXI) on 2011 November 11. This transient is characterized by a soft X-ray spectrum, a short duration (1.3…

Soft X-ray and FUV observations of Nova Her 2021 (V1674 Her) with AstroSat Open

Yash Bhargava, G. C. Dewangan, G. C. Anupama, U. S. Kamath, L. S. Sonith , et al. · 2023

Nova Her 2021 or V1674 Her was one of the fastest novae to be observed so far. We report here the results from our timing and spectral studies of the source observed at multiple epochs with AstroSat. We report the detection of a periodicit…

Soft X-ray and FUV observations of Nova Her 2021 (V1674~Her) with AstroSat Open

Yash Bhargava, G. C. Dewangan, G. C. Anupama, U. S. Kamath, L. S. Sonith , et al. · 2023

Nova Her 2021 or V1674 Her was one of the fastest novae to be observed so far. We report here the results from our timing and spectral studies of the source observed at multiple epochs with AstroSat. We report the detection of a periodicit…

Astronomy as a Field: A Guide for Aspiring Astrophysicists Open

Ava Polzin, Y. Asali, Sanah Bhimani, Madison Brady, Mandy C. Chen , et al. · 2023

This book was created as part of the SIRIUS B VERGE program to orient students to astrophysics as a broad field. The 2023-2024 VERGE program and the printing of this book is funded by the Women and Girls in Astronomy Program via the Intern…

The Luminosity Phase Space of Galactic and Extragalactic X-Ray Transients Out to Intermediate Redshifts Open

Ava Polzin, R. Margutti, D. L. Coppejans, Katie Auchettl, K. L. Page , et al. · 2023

We present a detailed compilation and analysis of the X-ray phase space of low- to intermediate-redshift (0 ≤ z ≤ 1) transients that consolidates observed light curves (and theory where necessary) for a large variety of classes of transien…

A two-component clumpy model for the shell evolution of classical novae: the case of V5668 Sgr Open

Z. Abraham, Larissa Takeda, Pedro P. B. Beaklini, Marcos P. Diaz, K. L. Page , et al. · 2023

The shell of the classical nova V5668 Sgr was resolved by ALMA at the frequency of 230 GHz 927 d after eruption, showing that most of the continuum bremsstrahlung emission originates in clumps with diameter smaller than 1015 cm. Using Very…

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