Browsing by Author "Stern, Daniel"

Now showing items 1-13 of 13

    • An 8.56 keV absorption line in the hyperluminous X-ray source in NGC 4045: Ultra-fast outflow or cyclotron line? 

      Brightman, Murray; Kosec, Peter; Fürst, Felix; Earnshaw, Hannah; Heida, Marianne; Middleton, Matthew J; Stern, Daniel; Walton, Dominic J (2022-04-21)
      We report on the discovery of an absorption line at $E=8.56^{+0.05}_{-0.11}$ keV detected with a significance of $>3.3\sigma$ in the NuSTAR and XMM-Newton spectra of a newly discovered hyperluminous X-ray source (HLX, ...

    • An 8.56 keV Absorption Line in the Hyperluminous X-Ray Source in NGC 4045: Ultrafast Outflow or Cyclotron Line? 

      Brightman, Murray; Kosec, Peter; Fürst, Felix; Earnshaw, Hannah; Heida, Marianne; Middleton, Matthew J; Stern, Daniel; Walton, Dominic J (2022-04-21)
      We report on the discovery of an absorption line at E=8.56−0.11+0.05 keV detected with a significance of >3.3σ in the NuSTAR and XMM-Newton spectra of a newly discovered hyperluminous X-ray source (L X > 1041 erg s−1) in ...

    • Evolution of the spin, spectrum and super-orbital period of the ultraluminous X-ray pulsar M51 ULX7 

      Brightman, Murray; Bachetti, Matteo; Earnshaw, Hannah; Fürst, Felix; Heida, Marianne; Israel, Gian Luca; Pike, Sean; Stern, Daniel; Walton, Dominic J (2022-01-21)
      M51 ULX7 is among a small group of known ultra luminous X-ray pulsars (ULXPs). The neutron star powering the source has a spin period of 2.8 s, orbits its companion star with a period of 2 days, and a super orbital period ...

    • Gaia GraL: Gaia DR2 gravitational lens systems – VIII. A radio census of lensed systems 

      Dobie, Dougal; Sluse, Dominique; Deller, Adam; Murphy, Tara; Krone-Martins, Alberto; Stern, Daniel; Wang, Ziteng; Wang, Yuanming; Bœhm, Céline; Djorgovski, S G; Galluccio, Laurent; Delchambre, Ludovic; Connor, Thomas; den Brok, Jakob Sebastiaan; Do Vale Cunha, Pedro H; Ducourant, Christine; Graham, Matthew J; Jalan, Priyanka; Klioner, Sergei A; Klüter, Jonas; Mignard, François; Negi, Vibhore; Petit, Quentin; Scarano Sergio, Jr; Slezak, Eric; Surdej, Jean; Teixeira, Ramachrisna; Walton, Dominic J; Wambsganss, Joachim (2024-03-01)
      We present radio observations of 24 confirmed and candidate strongly lensed quasars identified by the Gaia Gravitational Lenses working group. We detect radio emission from eight systems in 5.5 and 9 GHz observations with ...

    • Gaia GraL: Gaia DR2 Gravitational Lens Systems. VII. XMM-Newton Observations of Lensed Quasars 

      Connor, Thomas; Stern, Daniel; Krone-Martins, Alberto; Djorgovski, S. G.; Graham, Matthew J.; Walton, Dominic J.; Delchambre, Ludovic; Ducourant, Christine; Teixeira, Ramachrisna; Campion, Jean-François Le; Brok, Jakob Sebastian den; Dobie, Dougal; Galluccio, Laurent; Jalan, Priyanka; Klioner, Sergei A.; Klüter, Jonas; Mahabal, Ashish A.; Negi, Vibhore; Nierenberg, Anna; Petit, Quentin; Jr, Sergio Scarano; Slezak, Eric; Sluse, Dominique; Spíndola-Duarte, Carolina; Surdej, Jean; Wambsganss, Joachim (2022-03-03)
      We present XMM-Newton X-ray observations of nine confirmed lensed quasars at 1 ≲ z ≲ 3 identified by the Gaia Gravitational Lens program. Eight systems are strongly detected, with 0.3-8.0 keV fluxes F 0.3-8.0 ≳ 5 ×10-14 ...

    • The high energy X-ray probe ( HEX-P ): studying extreme accretion with ultraluminous X-ray sources 

      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.; El Byad, Hamza; García, Javier A.; Luca Israel, Gian; Jaodand, Amruta; Madsen, Kristin; Maitra, Chandreyee; Mandel, Shifra; Mori, Kaya; Pintore, Fabio; Ohsuga, Ken; Pilia, Maura; Stern, Daniel; Younes, George; Wolter, Anna (2023-11-27)
      Introduction: 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 ...

    • The High Energy X-ray Probe (HEX-P): probing accretion onto stellar mass black holes 

      Connors, Riley M. T.; Tomsick, John A.; Draghis, Paul; Coughenour, Benjamin; Shaw, Aarran W.; García, Javier A.; Walton, Dominic; Madsen, Kristin; Stern, Daniel; Rodriguez, Nicole Cavero; Dauser, Thomas; Del Santo, Melania; Jiang, Jiachen; Krawczynski, Henric; Liu, Honghui; Neilsen, Joseph; Nowak, Michael; Pike, Sean; Santangelo, Andrea; Sridhar, Navin; West, Andrew; Wilms, Jörn (2024-01-08)
      Accretion is a universal astrophysical process that plays a key role in cosmic history, from the epoch of reionization to galaxy and stellar formation and evolution. Accreting stellar-mass black holes in X-ray binaries are ...

    • The high energy X-ray probe (HEX-P): probing the physics of the X-ray corona in active galactic nuclei 

      Kammoun, Elias; Lohfink, Anne M.; Masterson, Megan; Wilkins, Dan R.; Zhao, Xiurui; Balokovic, Mislav; Boorman, Peter G.; Connors, Riley; Coppi, Paolo; Fabian, Andrew; García, Javier A.; Madsen, Kristin K.; Rodriguez Cavero, Nicole; Sridhar, Navin; Stern, Daniel; Tomsick, John; Wevers, Thomas; Walton, Dominic J.; Bianchi, Stefano; Buchner, Johannes; Civano, Francesca M.; Lanzuisi, Giorgio; Mallick, Labani; Matt, Giorgio; Merloni, Andrea; Nardini, Emanuele; Piotrowska, Joanna M.; Ricci, Claudio; Wong, Ka-Wah; Zoghbi, Abderahmen (2024-01-05)
      The hard X-ray emission in active galactic nuclei (AGN) and black hole X-ray binaries is thought to be produced by a hot cloud of electrons referred to as the corona. This emission, commonly described by a power law with ...

    • NuSTAR Observations of Candidate Subparsec Binary Supermassive Black Holes 

      Saade, M. Lynne; Brightman, Murray; Stern, Daniel; Connor, Thomas; Djorgovski, S. G.; D’Orazio, Daniel J.; Ford, K. E. S.; Graham, Matthew J.; Haiman, Zoltán; Jun, Hyunsung D.; Kammoun, Elias; Kraft, Ralph P.; McKernan, Barry; Vikhlinin, Alexei; Walton, Dominic J. (2024-05-01)
      We present an analysis of NuSTAR X-ray observations of three active galactic nuclei (AGN) that were identified as candidate subparsec binary supermassive black hole (SMBH) systems in the Catalina Real-Time Transient Survey ...

    • Orbital Decay in M82 X-2 

      Bachetti, Matteo; Heida, Marianne; Maccarone, Thomas; Huppenkothen, Daniela; Israel, Gian Luca; Barret, Didier; Brightman, Murray; Brumback, McKinley; Earnshaw, Hannah P.; Forster, Karl; Fürst, Felix; Grefenstette, Brian W.; Harrison, Fiona A.; Jaodand, Amruta D.; Madsen, Kristin K.; Middleton, Matthew; Pike, Sean N.; Pilia, Maura; Poutanen, Juri; Stern, Daniel; Tomsick, John A.; Walton, Dominic J.; Webb, Natalie; Wilms, Jörn (2022-10-05)
      M82 X-2 is the first pulsating ultraluminous X-ray source discovered. The luminosity of these extreme pulsars, if isotropic, implies an extreme mass transfer rate. An alternative is to assume a much lower mass transfer ...

    • A submillimetre galaxy at z=4.76 in the LABOCA survey of the Extended Chandra Deep Field South 

      Coppin, Kristen; Smail, Ian; M. Alexander, David; Weiss, Axel; Walter, Fabian; Swinbank, Mark; Greve, Thomas; Kovacs, Attila; De Breuck, Carlos; Dickinson, Mark; Ibar, Edo; Ivison, Rob; Reddy, Naveen; Spinrad, Hyron; Stern, Daniel; Brandt, Niel; Chapman, Scott; Dannerbauer, Helmut; van Dokkum, Pieter; Dunlop, James; Frayer, David; Gawiser, Eric; Geach, James; Huynh, Minh; Knudsen, Kirsten; Koekemoer, Anton; Lehmer, Bret; Menten, Karl; Papovich, Casey; Rix, Hans-Walter; Schinnerer, Eva; Wardlow, Julie; van der Werf, Paul (2009)
      We report on the identification of the highest redshift submm-selected source currently known: LESSJ033229.4-275619. This source was detected in the Large Apex BOlometer CAmera (LABOCA) Extended Chandra Deep Field South ...

    • The Tidal Disruption Event AT2021ehb : Evidence of Relativistic Disk Reflection, and Rapid Evolution of the Disk-Corona System 

      Yao, Yuhan; Lu, Wenbin; Guolo, Muryel; Pasham, Dheeraj R.; Gezari, Suvi; Gilfanov, Marat; Gendreau, Keith C.; Harrison, Fiona; Cenko, S. Bradley; Kulkarni, S. R.; Miller, Jon M.; Walton, Dominic J.; García, Javier A.; Velzen, Sjoert van; Alexander, Kate D.; Miller-Jones, James C. A.; Nicholl, Matt; Hammerstein, Erica; Medvedev, Pavel; Stern, Daniel; Ravi, Vikram; Sunyaev, R.; Bloom, Joshua S.; Graham, Matthew J.; Kool, Erik C.; Mahabal, Ashish A.; Masci, Frank J.; Purdum, Josiah; Rusholme, Ben; Sharma, Yashvi; Smith, Roger; Sollerman, Jesper (2022-09-15)
      We present X-ray, UV, optical, and radio observations of the nearby ($\approx78$ Mpc) tidal disruption event (TDE) AT2021ehb/ZTF21aanxhjv during its first 430 days of evolution. AT2021ehb occurs in the nucleus of a galaxy ...

    • X-ray absorption and reprocessing in the z ∼ 2.5 lensed quasar 2MASS J1042+1641 

      Walton, Dominic; Reynolds, Mark; Stern, Daniel; Brightman, Murray; Lemon, Cameron (2022-10-19)
      We present new broad-band X-ray observations of the z ∼ 2.5 lensed quasar 2MASS J1042+1641, combining XMM–Newton, Chandra, and NuSTAR to provide coverage of the X-ray spectrum over the 0.3–40 keV bandpass in the observed ...