Zobrazeno 1 - 10
of 119
pro vyhledávání: '"Ludlam, R."'
Autor:
Ludlam, R. M., Malacaria, C., Sokolova-Lapa, E., Fuerst, F., Pradhan, P., Shaw, A. W., Pottschmidt, K., Pike, S., Vasilopoulos, G., Wilms, J., García, J. A., Madsen, K., Stern, D., Maitra, C., Del Santo, M., Walton, D. J., Brumback, M. C., Eijnden, J. van den
Accreting neutron stars (NSs) represent a unique laboratory for probing the physics of accretion in the presence of strong magnetic fields ($B\gtrsim 10^8$ G). Additionally, the matter inside the NS itself exists in an ultra-dense, cold state that ca
Externí odkaz:
http://arxiv.org/abs/2311.04687
Autor:
Yun, S. B., Grefenstette, B. W., Ludlam, R. M., Brumback, M. C., Buisson, D. J. K., Mastroserio, G., Pike, S. N.
We present the long term analysis of GS 1826-238, a neutron star X-ray binary known as the "Clocked Burster", using data from NuSTAR StrayCats. StrayCats, a catalogue of NuSTAR stray light data, contains data from bright, off-axis X-ray sources that
Externí odkaz:
http://arxiv.org/abs/2212.05243
Autor:
Mastroserio, G., Grefenstette, B. W., Thalhammer, P., Buisson, D. J. K., Brumback, M. C., Ludlam, R. M., Connors, R. M. T., Garcıa, J. A., Grinberg, V., Madsen, K. K., Miyasaka, H., Tomsick, J. A., Wilms, J.
Due to the structure of the NuSTAR telescope, photons at large off-axis (> 1deg) can reach the detectors directly (stray light), without passing through the instrument optics. At these off-axis angles NuSTAR essentially turns into a collimated instru
Externí odkaz:
http://arxiv.org/abs/2209.14325
Autor:
Ludlam, R. M., Grefenstette, B. W., Brumback, M. C., Tomsick, J. A., Buisson, D. J. K., Coughenour, B. M., Mastroserio, G., Wik, D., Krivonos, R., Jaodand, A. D., Madsen, K. K.
We present an updated catalog of StrayCats (a catalog of NuSTAR stray light observations of X-ray sources) that includes nearly 18 additional months of observations. StrayCats v2 has an added 53 sequence IDs, 106 rows, and 3 new identified stray ligh
Externí odkaz:
http://arxiv.org/abs/2206.09930
Autor:
Brumback, McKinley C., Grefenstette, B. W., Buisson, D. J. K., Bachetti, M., Connors, R., Garcia, J. A., Jaodand, A., Krivonos, R., Ludlam, R., Madsen, K. K., Mastroserio, G., Tomsick, J. A., Wik, D.
StrayCats, the catalog of NuSTAR stray light observations, contains data from bright X-ray sources that fall within crowded source regions. These observations offer unique additional data with which to monitor sources like X-ray binaries that show va
Externí odkaz:
http://arxiv.org/abs/2202.11261
Autor:
Pike, Sean N., Negoro, Hitoshi, Tomsick, John A., Bachetti, Matteo, Brumback, McKinley, Connors, Riley M. T., García, Javier A., Grefenstette, Brian, Hare, Jeremy, Harrison, Fiona A., Jaodand, Amruta, Ludlam, R. M., Mastroserio, Guglielmo, Mihara, Tatehiro, Shidatsu, Megumi, Sugizaki, Mutsumi, Takagi, Ryohei
We present the results of MAXI monitoring and two NuSTAR observations of the recently discovered faint X-ray transient MAXI J1848-015. Analysis of the MAXI light-curve shows that the source underwent a rapid flux increase beginning on 2020 December 2
Externí odkaz:
http://arxiv.org/abs/2202.02883
Autor:
Ludlam, R. M., Cackett, E. M., García, J. A., Miller, J. M., Stevens, A. L., Fabian, A. C., Homan, J., NG, M., Guillot, S., Buisson, D. J. K., Chakrabarty, D.
We present a spectral analysis of NuSTAR and NICER observations of the luminous, persistently accreting neutron star (NS) low-mass X-ray binary Cygnus X-2. The data were divided into different branches that the source traces out on the Z-track of the
Externí odkaz:
http://arxiv.org/abs/2201.11767
Autor:
Trueba, Nicolas, Miller, J. M., Fabian, A. C., Kaastra, J., Kallman, T., Lohfink, A., Ludlam, R. M., Proga, D., Raymond, J., Reynolds, C., Reynolds, M., Zoghbi, A.
Analyses of absorption from disk winds and atmospheres in accreting compact objects typically treat the central emitting regions in these systems as point sources relative to the absorber. This assumption breaks down if the absorbing gas is located w
Externí odkaz:
http://arxiv.org/abs/2111.04764
Autor:
Pike, Sean N., Harrison, Fiona A., Tomsick, John A., Bachetti, Matteo, Buisson, Douglas J. K., García, Javier A., Jiang, Jiachen, Ludlam, R. M., Madsen, Kristin K.
We present analysis of two type-I X-ray bursts observed by NuSTAR originating from the very faint transient neutron star low-mass X-ray binary GRS 1741.9-2853 during a period of outburst in May 2020. We show that the persistent emission can be modele
Externí odkaz:
http://arxiv.org/abs/2106.13312
Autor:
Ludlam, R. M., Jaodand, A. D., García, J. A., Degenaar, N., Tomsick, J. A., Cackett, E. M., Fabian, A. C., Gandhi, P., Buisson, D. J. K., Shaw, A. W., Chakrabarty, D.
We present the first joint NuSTAR and NICER observations of the ultra-compact X-ray binary (UCXB) 4U 1543$-$624 obtained in 2020 April. The source was at a luminosity of $L_{0.5-50\ \mathrm{keV}} = 4.9 (D/7\ \mathrm{kpc})^{2}\times10^{36}$ ergs s$^{-
Externí odkaz:
http://arxiv.org/abs/2012.10461