Zobrazeno 1 - 10
of 5 053
pro vyhledávání: '"Ng, M"'
Autor:
Ursini, F., Gnarini, A., Bianchi, S., Bobrikova, A., Capitanio, F., Cocchi, M., Fabiani, S., Farinelli, R., Kaaret, P., Matt, G., Ng, M., Poutanen, J., Ravi, S., Tarana, A.
We present simultaneous X-ray polarimetric and spectral observations of the bright atoll source Ser~X-1 carried out with the Imaging X-ray Polarimetry Explorer (IXPE), NICER, and NuSTAR. We obtain an upper limit of 2% (99% confidence level) on the po
Externí odkaz:
http://arxiv.org/abs/2408.16713
This study employs percolation theory to investigate the hierarchical organisation of Australian urban centres through the connectivity of their road networks. The analysis demonstrates how discrete urban clusters have developed into integrated regio
Externí odkaz:
http://arxiv.org/abs/2408.09054
Autor:
Marino, A., Yang, H., Zelati, F. Coti, Rea, N., Guillot, S., Jaisawal, G. K., Maitra, C., Haberl, F., Kuulkers, E., Yuan, W., Feng, H., Tao, L., Jin, C., Sun, H., Zhang, W., Chen, W., Heuvel, E. P. J. van den, Soria, R., Zhang, B., Weng, S. -S., Ji, L., Zhang, G. B., Pan, X., Lv, Z., Zhang, C., Ling, Z., Chen, Y., Jia, S., Liu, Y., Ness, J. -U., Cheng, H. Q., Li, D. Y., Gendreau, K. C., Ng, M., Strohmayer, T. E.
On May 27 2024, the Wide-field X-ray Telescope onboard the Einstein Probe (EP) mission detected enhanced X-ray emission from a new transient source in the Small Magellanic Cloud (SMC) during its commissioning phase. Prompt follow-up with the EP Follo
Externí odkaz:
http://arxiv.org/abs/2407.21371
Autor:
Chouhan, V., Bice, D., Burk, D., Chandrasekaran, S., Cravatta, A., Dubiel, P., Eremeev, G. V., Furuta, F., Melnychuk, O., Netepenko, A., Ng, M. K., Ozelis, J., Park, H., Ring, T., Wu, G., Guilfoyle, B., Kelly, M. P., Reid, T.
Electropolishing (EP) of 1.3 GHz niobium superconducting RF cavities is conducted to achieve a desired smooth and contaminant-free surface that yields good RF performance. Achieving a smooth surface of a large-sized elliptical cavity with the standar
Externí odkaz:
http://arxiv.org/abs/2401.15157
Surface preparation of niobium superconducting RF cavities is a critical step for achieving good RF performance under the superconducting state. Surface defect, roughness, and contamination affect the accelerating gradient and quality factor of the c
Externí odkaz:
http://arxiv.org/abs/2307.10414
Autor:
Albayati, A. C., Bult, P., Altamirano, D., Chenevez, J., Guillot, S., Güver, T., Jaisawal, G. K., Malacaria, C., Mancuso, G. C., Marino, A., Ng, M., Sanna, A., Strohmayer, T. E.
Swift J1749.4-2807 is the only known eclipsing accreting millisecond X-ray pulsar. In this paper, we report on 7 thermonuclear (Type-I) X-ray bursts observed by NICER during its 2021 outburst. The first 6 bursts show slow rises and long decays, indic
Externí odkaz:
http://arxiv.org/abs/2306.11440
Autor:
Mancuso, G. C., Altamirano, D., Bult, P., Chenevez, J., Guillot, S., Guver, T., Jaisawal, G. K., Malacaria, C., Ng, M., Sanna, A., Strohmayer, T. E.
We report the discovery of millihertz quasi-periodic oscillations (mHz QPOs) from the neutron star (NS) low-mass X-ray binary 4U 1730--22 using the Neutron Star Interior Composition Explorer (NICER). After being inactive for almost 50 years, 4U 1730-
Externí odkaz:
http://arxiv.org/abs/2304.09935
Autor:
Jaisawal, G. K., Vasilopoulos, G., Naik, S., Maitra, C., Malacaria, C., Chhotaray, B., Gendreau, K. C., Guillot, S., Ng, M., Sanna, A.
We report comprehensive spectral and temporal properties of the Be/X-ray binary pulsar SMC X-2 using X-ray observations during the 2015 and 2022 outbursts. The pulse profile of the pulsar is unique and strongly luminosity dependent. It evolves from a
Externí odkaz:
http://arxiv.org/abs/2303.07225
Autor:
Malacaria, C., Ducci, L., Falanga, M., Altamirano, D., Bozzo, E., Guillot, S., Jaisawal, G. K., Kretschmar, P., Ng, M., Pradhan, P., Rothschild, R., Sanna, A., Thalhammer, P., Wilms, J.
Publikováno v:
A&A 669, A38 (2023)
When accreting X-ray pulsars (XRPs) undergo bright X-ray outbursts, their luminosity-dependent spectral and timing features can be analysed in detail. The XRP GRO J1750-27 recently underwent one of such episodes, during which it was observed with $Nu
Externí odkaz:
http://arxiv.org/abs/2211.06367
Autor:
Sanna, A., Bult, P., NG, M., Ray, P. S., Jaisawal, G. K., Burderi, L., Di Salvo, T., Riggio, A., Altamirano, D., Strohmayer, T. E., Manca, A., Gendreau, K. C., Chakrabarty, D., Iwakiri, W., Iaria, R.
The detection of coherent X-ray pulsations at ~314 Hz (3.2 ms) classifies MAXI J1957+032 as a fast-rotating, accreting neutron star. We present the temporal and spectral analysis performed using NICER observations collected during the latest outburst
Externí odkaz:
http://arxiv.org/abs/2208.05807