Zobrazeno 1 - 10
of 1 076
pro vyhledávání: '"A. Gúrpide"'
Autor:
Imbrogno, Matteo, Motta, Sara Elisa, Amato, Roberta, Israel, Gian Luca, Castillo, Guillermo Andres Rodríguez, Brightman, Murray, Casella, Piergiorgio, Bachetti, Matteo, Fürst, Felix, Stella, Luigi, Pinto, Ciro, Pintore, Fabio, Tombesi, Francesco, Gúrpide, Andrés, Middleton, Matthew J., Salvaggio, Chiara, Tiengo, Andrea, Belfiore, Andrea, De Luca, Andrea, Esposito, Paolo, Wolter, Anna, Earnshaw, Hannah P., Walton, Dominic J., Roberts, Timothy P., Zampieri, Luca, Marelli, Martino, Salvaterra, Ruben
The discovery of pulsations in (at least) six ultraluminous X-ray sources (ULXs) has shown that neutron stars can accrete at (highly) super-Eddington rates, challenging the standard accretion theories. M51 ULX-7, with a spin signal of $P\simeq2.8$ s,
Externí odkaz:
http://arxiv.org/abs/2407.09240
Autor:
Gandhi, P., Borowski, E. S., Byrom, J., Hynes, R. I., Maccarone, T. J., Shaw, A. W., Adegoke, O. K., Altamirano, D., Baglio, M. C., Bhargava, Y., Britt, C. T., Buckley, D. A. H., Buisson, D. J. K., Casella, P., Segura, N. Castro, Charles, P. A., Corral-Santana, J. M., Dhillon, V. S., Fender, R., Gúrpide, A., Heinke, C. O., Igl, A. B., Knigge, C., Markoff, S., Mastroserio, G., McCollough, M. L., Middleton, M., Miller, J. M., Miller-Jones, J. C. A., Motta, S. E., Paice, J. A., Pawar, D. D., Plotkin, R. M., Pradhan, P., Ressler, M. E., Russell, D. M., Russell, T. D., Santos-Sanz, P., Shahbaz, T., Sivakoff, G. R., Steeghs, D., Tetarenko, A. J., Tomsick, J. A., Vincentelli, F. M., George, M., Gurwell, M., Rao, R.
We present mid-infrared (MIR) spectral-timing measurements of the prototypical Galactic microquasar GRS 1915+105. The source was observed with the Mid-Infrared Instrument (MIRI) onboard JWST in June 2023 at a MIR luminosity L(MIR)~10^{36} erg/s excee
Externí odkaz:
http://arxiv.org/abs/2406.18637
Autor:
Gúrpide, Andrés, Segura, Noel Castro
A major prediction of most super-Eddington accretion theories is the presence of anisotropic emission from supercritical disks, but the degree of anisotropy and its dependency with energy remain poorly constrained observationally. A key breakthrough
Externí odkaz:
http://arxiv.org/abs/2405.14512
While much has been learned in recent decades about the X-ray emission of the extragalactic Ultraluminous X-ray sources (ULXs), their radiative output in the UV band remains poorly constrained. Understanding of the full ULX spectral energy distributi
Externí odkaz:
http://arxiv.org/abs/2405.13714
Autor:
Wang, Yanan, Pasham, Dheeraj R., Altamirano, Diego, Gurpide, Andres, Segura, Noel Castro, Middleton, Matthew, Ji, Long, del Palacio, Santiago, Guolo, Muryel, Gandhi, Poshak, Zhang, Shuang-Nan, Remillard, Ronald, Lin, Dacheng, Masterson, Megan, Baldi, Ranieri D., Tombesi, Francesco, Miller, Jon M., Zhang, Wenda, Sanna, Andrea
The tidal disruption of a star around a supermassive black hole (SMBH) offers a unique opportunity to study accretion onto a SMBH on a human-timescale. We present results from our 1000+ days NICER, Swift and Chandra monitoring campaign of AT 2019avd,
Externí odkaz:
http://arxiv.org/abs/2312.13543
Autor:
Barra, F., Pinto, C., Middleton, M., Di Salvo, T., Walton, D. J., Gúrpide, A., Roberts, T. P.
We present a comprehensive spectral analysis of the ultraluminous X-ray source Holmberg II X-1 using broadband and high-resolution X-ray spectra taken with the XMM-Newton satellite over a period of 19 years benefiting from a recent campaign. We teste
Externí odkaz:
http://arxiv.org/abs/2311.16243
Autor:
Bachetti, Matteo, Middleton, Matthew J., Pinto, Ciro, Gúrpide, Andrés, Walton, Dominic J., Brightman, Murray, Lehmer, Bret, Roberts, Timothy P., Vasilopoulos, Georgios, Alford, Jason, Amato, Roberta, Ambrosi, Elena, Dai, Lixin, Earnshaw, Hannah P., Byad, Hamza El, García, Javier A., Israel, Gian Luca, Jaodand, Amruta, Madsen, Kristin, Maitra, Chandreyee, Mandel, Shifra, Mori, Kaya, Pintore, Fabio, Ohsuga, Ken, Pilia, Maura, Stern, Daniel, Younes, George, Wolter, Anna
Ultraluminous X-ray sources (ULXs) represent an extreme class of accreting compact objects: from the identification of some of the accretors as neutron stars to the detection of powerful winds travelling at 0.1-0.2 c, the increasing evidence points t
Externí odkaz:
http://arxiv.org/abs/2311.04733
Publikováno v:
A&A 669, A130 (2023)
We investigate the nature of the ULX M81 X-6, which has been suggested to harbour a neutron star (NS), by studying its long-term X-ray spectral and temporal evolution, using the rich set of available archival data from XMM-Newton, Chandra, NuSTAR, an
Externí odkaz:
http://arxiv.org/abs/2212.07391
Autor:
Javier A. García, Daniel Stern, Kristin Madsen, Miles Smith, Brian Grefenstette, Marco Ajello, Jason Alford, Adlyka Annuar, Matteo Bachetti, Mislav Baloković, Ricarda S. Beckmann, Stefano Bianchi, Daniela Biccari, Peter Boorman, Murray Brightman, Johannes Buchner, Esra Bulbul, Chien-Ting Chen, Francesca Civano, Joel Coley, Riley M. T. Connors, Melania Del Santo, Laura Di Gesu, Paul A. Draghis, P. Chris Fragile, Andrés Gúrpide, Manuele Gangi, Suvi Gezari, Fiona Harrison, Elias Kammoun, Giorgio Lanzuisi, Bret Lehmer, Anne Lohfink, Renee Ludlam, Stefano Marchesi, Lea Marcotulli, Raffaella Margutti, Megan Masterson, Andrea Merloni, Matthew Middleton, Kaya Mori, Alberto Moretti, Kirpal Nandra, Kerstin Perez, Ryan W. Pfeifle, Ciro Pinto, Joanna Piotrowska, Gabriele Ponti, Katja Pottschmidt, Peter Predehl, Simonetta Puccetti, Arne Rau, Stephen Reynolds, Andrea Santangelo, Daniele Spiga, John A. Tomsick, Núria Torres-Albà, Dominic J. Walton, Daniel Wilkins, Joern Wilms, Will Zhang, Xiurui Zhao
Publikováno v:
Frontiers in Astronomy and Space Sciences, Vol 11 (2024)
To answer NASA’s call for a sensitive X-ray observatory in the 2030s, we present the High Energy X-ray Probe (HEX-P) mission concept. HEX-P is designed to provide the required capabilities to explore current scientific questions and make new discov
Externí odkaz:
https://doaj.org/article/a9115eae4e0d4da8b9a73e288ec48f9e
An expected signature of the presence of neutron stars in the population of ultraluminous X-ray sources (ULXs) are large scale changes in X-ray luminosity, as systems reach spin equilibrium and a propeller state ensues. We explore the predicted lumin
Externí odkaz:
http://arxiv.org/abs/2211.13758