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Bubble in the Whale: Identifying the Optical Counterparts and Extended Nebula for the Ultraluminous X-ray Sources in NGC 4631
Jing Guo, Jianfeng Wu, Hua Feng +9
We present a deep optical imaging campaign on the starburst galaxy NGC 4631 with CFHT/MegaCam. By supplementing the HST/ACS and Chandra/ACIS archival data, we search for the optica…
Monte-Carlo simulations on possible collimation effects of outflows to fan-beamed emission of ultraluminous accreting X-ray pulsars
X. Hou, Y. You, L. Ji +10
Pulsating ultraluminous X-ray sources (PULXs) are accreting pulsars with apparent X-ray luminosity exceeding . We perform Monte-Carlo simulations to inve…
Fan beamed X-ray emission from 1 keV to above 130 keV from the ultraluminous X-ray pulsar RX J0209.6-7427 in the Small Magellanic Cloud
X. Hou, M. Y. Ge, L. Ji +10
We present detailed timing and spectral analyses of the transient X-ray pulsar RX J0209.67427 in the Small Magellanic Cloud during its 2019 giant outburst. With a better known d…
VLT MUSE observations of the bubble nebula around NGC 1313 X-2 and evidence for additional photoionization
Changxing Zhou, Fuyan Bian, Hua Feng +1
The bubble nebula surrounding NGC 1313 X-2 is believed to be powered by high velocity winds from the central ultraluminous X-ray source (ULX) as a result of supercritical accretion…
In-orbit Radiation Damage Characterization of SiPMs in the GRID-02 CubeSat Detector
Xutao Zheng, Huaizhong Gao, Jiaxing Wen +15
Recently, silicon photomultipliers (SiPMs) have been used in several space-borne missions, owing to their solid state, compact size, low operating voltage, and insensitivity to mag…
Searching for single-frame rapid X-ray transients detected with Chandra
Yijia Zhang, Hua Feng
We propose a new method to identify rapid X-ray transients observed with focusing telescopes. They could be statistically significant if three or more photons are detected with Cha…