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Serendipitous detection of an intense X-ray flare in the weak-line T Tauri star KM Ori with SRG/eROSITA
Arun, R.; Mathew, Blesson; Kartha, Sreeja S. +8 more
Weak-line T Tauri stars (WTTS) exhibit X-ray flares, likely resulting from magnetic reconnection that heats the stellar plasma to very high temperatures. These flares are difficult to identify through targeted observations. Here, we report the serendipitous detection of the brightest X-ray flaring state of the WTTS KM Ori in the eROSITA DR1 survey…
Probing the soft X-ray properties and multi-wavelength variability of SN2023ixf and its progenitor
Auchettl, Katie; Shappee, Benjamin J.; Beacom, John F. +3 more
We present a detailed analysis of nearly two decades of optical/UV and X-ray data to study the multi-wavelength pre-explosion properties and post-explosion X-ray properties of nearby SN2023ixf located in M101. We find no evidence of precursor activity in the optical to UV down to a luminosity of $\lesssim$ $1.0×105 \textrm{L}_{\odot}$ ,…
Evolutionary Map of the Universe (EMU): A pilot search for diffuse, non-thermal radio emission in galaxy clusters with the Australian SKA Pathfinder
Botteon, A.; Riseley, C. J.; Norris, R. P. +10 more
Clusters of galaxies have been found to host Mpc-scale diffuse, non-thermal radio emission in the form of central radio halos and peripheral relics. Turbulence and shock-related processes in the intra-cluster medium are generally considered responsible for the emission, though details of these processes are still not clear. The low surface brightn…
The Sydney Radio Star Catalogue: Properties of radio stars at megahertz to gigahertz frequencies
Stelzer, Beate; Das, Barnali; Pope, Benjamin J. S. +13 more
We present the Sydney Radio Star Catalogue, a new catalogue of stars detected at megahertz to gigahertz radio frequencies. It consists of 839 unique stars with 3 405 radio detections, more than doubling the previously known number of radio stars. We have included stars from large area searches for radio stars found using circular polarisation sear…
4XMM J182531.5−144036: A new persistent Be/X-ray binary found within the XMM-Newton serendipitous survey
Farrell, S. A.; Gosling, A. J.; Clark, J. S. +2 more
We aim to investigate the nature of time-variable X-ray sources detected in the XMM-Newton serendipitous survey. The X-ray light curves of objects in the XMM-Newton serendipitous survey were searched for variability, and coincident serendipitous sources observed by Chandra were also investigated. Subsequent infrared spectroscopy of the counterpart…
First detection of X-ray pulsations and spectrum of the high Galactic latitude pulsar PSR J0837–2454 and direct Urca cooling implications
Deller, Adam T.; Ho, Wynn C. G.; Becker, Werner +2 more
PSR J0837
Evolutionary map of the universe (EMU): Observations of filamentary structures in the Abell S1136 galaxy cluster
Reiprich, Thomas H.; Koribalski, Bärbel S.; Norris, Ray P. +17 more
We present radio observations of the galaxy cluster Abell S1136 at 888 MHz, using the Australian Square Kilometre Array Pathfinder radio telescope, as part of the Evolutionary Map of the Universe Early Science program. We compare these findings with data from the Murchison Widefield Array, XMM-Newton, the Wide-field Infrared Survey Explorer, the D…
Dashing through the cluster: An X-ray to radio view of UGC 10420 undergoing ram-pressure stripping
Raychaudhury, Somak; Singh, Kulinder Pal; Tiwari, Juhi +1 more
We present multi-wavelength data and analysis, including new FUV AstroSat/UVIT observations of the spiral galaxy UGC 10420 ( z=0.032 ), a member of the cluster Abell 2199. UGC 10420 is present on the edge of the X-ray emitting region of the cluster at a distance of ∼ 680 kpc from the centre. The far-ultraviolet (FUV) data obtained by the AstroSat …
The non-thermal emission from the colliding-wind binary Apep
del Palacio, S.; De Becker, M.; Romero, G. E. +2 more
Therecently discovered massive binary system Apep is the most powerful synchrotron emitter among the known Galactic colliding-wind binaries. This makes this particular system of great interest to investigate stellar winds and the non-thermal processes associated with their shocks. This source was detected at various radio bands, and in addition th…
The Evolutionary Map of the Universe pilot survey
Reiprich, Thomas H.; Koribalski, Bärbel S.; Norris, Ray P. +45 more
We present the data and initial results from the first pilot survey of the Evolutionary Map of the Universe (EMU), observed at 944 MHz with the Australian Square Kilometre Array Pathfinder (ASKAP) telescope. The survey covers $270 deg^2$ of an area covered by the Dark Energy Survey, reaching a depth of 25-30 $µJy beam^{-1}$ rms at a spatial …