Gamma-ray astronomy

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A MeerKAT survey of nearby dwarf novae: I. New detections

Monthly Notices of the Royal Astronomical Society 91探花 University Press 539:3 (2025) 1894-1907

Authors:

J Kersten, E K枚rding, PA Woudt, PJ Groot, DRA Williams, I Heywood, DL Coppejans, C Knigge, JCA Miller-Jones, GR Sivakoff, R Fender

Abstract:

A programme to search for radio emission from dwarf-novae-type cataclysmic variables was conducted with the South African MeerKAT radio telescope. The dwarf novae RU Pegasi, V426 Ophiuchi, and IP Pegasi were detected during outburst at L band (1284 MHz central frequency). Previously, only one cataclysmic variable was radio-detected at a frequency this low. We now bring the number to four. With these three newly found radio-emitters, the population of dwarf novae confirmed to be radio-emitting at any frequency reaches 10 systems. We found that the radio luminosity is correlated with the optical luminosity. For V426 Ophiuchi and RU Pegasi we found a radio decline contemporary with the outburst鈥檚 optical decline. The peak radio luminosity of dwarf novae in outburst is very similar to that of novalike Cataclysmic Variables and no correlation with orbital period is seen.

MeerKAT discovers a jet-driven bow shock near GRS 1915+105

Astronomy & Astrophysics EDP Sciences 696 (2025) a222

Authors:

SE Motta, P Atri, James H Matthews, Jakob van den Eijnden, Rob P Fender, James CA Miller-Jones, Ian Heywood, Patrick Woudt

Quantifying jet鈥搃nterstellar medium interactions in Cyg X-1: Insights from dual-frequency bow shock detection with MeerKAT

Astronomy & Astrophysics EDP Sciences 696 (2025) a223

Authors:

P Atri, SE Motta, J van den Eijnden, JH Matthews, JCA Miller-Jones, R Fender, D Williams-Baldwin, I Heywood, P Woudt

A MeerKAT survey of nearby dwarf novae: I. New detections

(2025)

Authors:

J Kersten, E K枚rding, PA Woudt, PJ Groot, DRA Williams, I Heywood, DL Coppejans, C Knigge, JCA Miller-Jones, GR Sivakoff, R Fender

Sub-second optical/near-infrared quasi-periodic oscillations from the black hole X-ray transient Swift J1727.8-1613

(2025)

Authors:

FM Vincentelli, T Shahbaz, P Casella, VS Dhillon, J Paice, D Altamirano, N Castro Segura, R Fender, P Gandhi, S Littlefair, T Maccarone, J Malzac, K O'Brien, DM Russell, AJ Tetarenko, P Uttley, A Veledina