Browsing by Author "Fabian, Andrew C."

Now showing items 1-4 of 4

    • High-density Reflection Spectroscopy of Black Hole X-Ray Binaries in the Hard State 

      Liu, Honghui; Jiang, Jiachen; Zhang, Zuobin; Bambi, Cosimo; Fabian, Andrew C.; Alonso-García, Javier; Ingram, Adam; Kara, Erin; Steiner, James F.; Tomsick, John A.; Walton, Dominic J.; Young, Andrew J. (2023-07-12)
      We present a high-density relativistic reflection analysis of 21 spectra of six black hole X-ray binaries in the hard state with data from NuSTAR and Swift. We find that 76% of the observations in our sample require a disk ...

    • A NuSTAR and Swift View of the Hard State of MAXI J1813-095 

      Jiang, Jiachen; Buisson, Douglas J. K.; Dauser, Thomas; Fabian, Andrew C.; Fürst, Felix; Gallo, Luigi C.; Harrison, Fiona A.; Parker, Michael L.; Steiner, James F.; Tomsick, John A.; Ubach, Santiago; Walton, Dominic J. (2022-08-01)
      We present an analysis of the NuSTAR and Swift spectra of the black hole candidate MAXI J1813−095 in a failed-transition outburst in 2018. The NuSTAR observations show evidence of reflected emission from the inner region ...

    • A small and vigorous black hole in the early Universe 

      Maiolino, Roberto; Scholtz, Jan; Witstok, Joris; Carniani, Stefano; D’Eugenio, Francesco; de Graaff, Anna; Übler, Hannah; Tacchella, Sandro; Curtis-Lake, Emma; Arribas, Santiago; Bunker, Andrew; Charlot, Stéphane; Chevallard, Jacopo; Curti, Mirko; Looser, Tobias J.; Maseda, Michael V.; Rawle, Timothy D.; Rodríguez del Pino, Bruno; Willott, Chris J.; Egami, Eiichi; Eisenstein, Daniel J.; Hainline, Kevin N.; Robertson, Brant; Williams, Christina C.; Willmer, Christopher N. A.; Baker, William M.; Boyett, Kristan; DeCoursey, Christa; Fabian, Andrew C.; Helton, Jakob M.; Ji, Zhiyuan; Jones, Gareth C.; Kumari, Nimisha; Laporte, Nicolas; Nelson, Erica J.; Perna, Michele; Sandles, Lester; Shivaei, Irene; Sun, Fengwu (2024-03-07)
      Several theories have been proposed to describe the formation of black hole seeds in the early Universe and to explain the emergence of very massive black holes observed in the first thousand million years after the Big ...

    • Unusual Hard X-Ray Flares Caught in NICER Monitoring of the Binary Supermassive Black Hole Candidate AT2019cuk/Tick Tock/SDSS J1430+2303 

      Masterson, Megan; Kara, Erin; Pasham, Dheeraj R.; D’Orazio, Daniel J.; Walton, Dominic J.; Fabian, Andrew C.; Lucchini, Matteo; Remillard, Ronald A.; Arzoumanian, Zaven; Burkhonov, Otabek; Choi, Hyeonho; Ehgamberdiev, Shuhrat A.; Ferrara, Elizabeth C.; Guolo, Muryel; Im, Myungshin; Kim, Yonggi; Mirzaqulov, Davron O.; Paek, Gregory S. H.; Sung, Hyun-Il; Yoon, Joh-Na (2023-03-14)
      The nuclear transient AT2019cuk/Tick Tock/SDSS J1430+2303 has been suggested to harbor a supermassive black hole (SMBH) binary near coalescence. We report results from high-cadence NICER X-ray monitoring with multiple ...