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Identification of the Optical Counterpart of the Fast X-Ray Transient EP240414a

The Astrophysical Journal Letters American Astronomical Society 978:2 (2025) l21

Authors:

S Srivastav, T-W Chen, JH Gillanders, L Rhodes, SJ Smartt, ME Huber, A Aryan, S Yang, A Beri, AJ Cooper, M Nicholl, KW Smith, HF Stevance, F Carotenuto, KC Chambers, A Aamer, CR Angus, MD Fulton, T Moore, IA Smith, DR Young, T de Boer, H Gao, C-C Lin, T Lowe, EA Magnier, P Minguez, Y-C Pan, RJ Wainscoat
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State-dependent signatures of jets and winds in the optical and infrared spectrum of the black hole transient GX 339-4

Astronomy & Astrophysics EDP Sciences (2025)

Authors:

A Ambrifi, D Mata Sánchez, T Muñoz-Darias, J Sánchez-Sierras, M Armas Padilla, MC Baglio, J Casares, JM Corral-Santana, VA Cúneo, RP Fender, G Ponti, DM Russell, M Shidatsu, D Steeghs, MAP Torres, Y Ueda, F Vincentelli
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Catalog-based pseudo-Cℓ s

Journal of Cosmology and Astroparticle Physics IOP Publishing 2025:01 (2025) 028-028

Authors:

Kevin Wolz, David Alonso, Andrina Nicola

Abstract:

<jats:title>Abstract</jats:title> <jats:p>We present a formalism to extract the angular power spectrum of fields sampled at a finite number of points with arbitrary positions — a common situation for several catalog-based astrophysical probes — through a simple extension of the standard pseudo-<jats:italic>C<jats:sub>ℓ</jats:sub> </jats:italic> algorithm. A key complication in this case is the need to handle the shot noise component of the associated discrete angular mask which, for sparse catalogs, can lead to strong coupling between very different angular scales. We show that this problem can be solved easily by estimating this contribution analytically and subtracting it. The resulting estimator is immune to small-scale pixelization effects and aliasing, and, most notably, unbiased against the contribution from measurement noise uncorrelated between different sources. We demonstrate the validity of the method in the context of cosmic shear datasets, and showcase its usage in the case of other spin-0 and spin-1 astrophysical fields of interest. We incorporate the method in the public <jats:ext-link xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="uri" xlink:href="https://github.com/LSSTDESC/NaMaster" xlink:type="simple">&lt;monospace&gt;NaMaster&lt;/monospace&gt;</jats:ext-link> code.</jats:p>
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Rapid Mid-Infrared Spectral-Timing with JWST: I. GRS 1915+105 during a MIR–bright and X-ray–obscured state

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) (2025) staf036

Authors:

P Gandhi, ES Borowski, J Byrom, RI Hynes, TJ Maccarone, AW Shaw, OK Adegoke, D Altamirano, MC Baglio, Y Bhargava, CT Britt, DAH Buckley, DJK Buisson, P Casella, N Castro Segura, PA Charles, JM Corral-Santana, VS Dhillon, R Fender, A Gúrpide, CO Heinke, AB Igl, C Knigge, S Markoff, G Mastroserio, ML McCollough, M Middleton, JM Miller, JCA Miller-Jones, SE Motta, JA Paice, DD Pawar, RM Plotkin, P Pradhan, ME Ressler, DM Russell, TD Russell, P Santos-Sanz, T Shahbaz, GR Sivakoff, D Steeghs, AJ Tetarenko, JA Tomsick, FM Vincentelli, M George, M Gurwell, R Rao
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Peculiar radio-bright behaviour of the Galactic black hole transient 4U 1543-47 in the 2021-2023 outburst

(2025)

Authors:

X Zhang, W Yu, F Carotenuto, SE Motta, R Fender, JCA Miller-Jones, TD Russell, A Bahramian, P Woudt, AK Hughes, GR Sivakoff