Zobrazeno 1 - 10
of 19
pro vyhledávání: '"Gúrpide, Andrés"'
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:
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:
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
Publikováno v:
A&A 666, A100 (2022)
The presence of large ionised gaseous nebulae found around some ultraluminous X-ray sources (ULXs) provides the means to assess the mechanical and radiative feedback of the central source, and hence constrain the efficiency and impact on the surround
Externí odkaz:
http://arxiv.org/abs/2201.09333
Publikováno v:
Monthly Notices of the Royal Astronomical Society: Letters, Oxford Journals, In press
We report here the discovery of NGC 7793 ULX-4, a new transient ultraluminous X-ray source (ULX) in NGC 7793, a spiral galaxy already well known for harbouring several ULXs. This new source underwent an outburst in 2012, when it was detected by \text
Externí odkaz:
http://arxiv.org/abs/2103.11650
Publikováno v:
A&A 649, A104 (2021)
The discovery of pulsations in several Ultraluminous X-ray sources (ULXs) demonstrated that a fraction of ULXs are powered by super-Eddington accretion onto neutron stars (NSs). This opened the debate as to what is the NS to black hole (BH) ratio wit
Externí odkaz:
http://arxiv.org/abs/2102.11159
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