Search Results - "Arzoumanian, Z."

The Corona Contracts in a Black-Hole Transient by Kara, E., Steiner, J. F., Fabian, A C, Cackett, E M, Uttley, P, Remillard, R A, Gendreau, K C, Arzoumanian, Z, Altamirano, D, Eikenberry, S, Enoto, T, Homan, J, Nielsen, J, Stevens, A L

“…The geometry of the accretion flow around stellar-mass black holes can change on timescales of days to months1–3. When a black hole emerges from quiescence…”
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Relativistic Shapiro Delay Measurements of an Extremely Massive Millisecond Pulsar by Cromartie, H T, Fonseca, E, Ransom, S M, Demorest, P B, Arzoumanian, Z, Blumer, H, Brook, P R, DeCesar, M E, Dolch, T, Ellis, J A, Ferdman, R D, Ferrara, E C, Garver-Daniels, N, Gentile, P, Jones, M L, Lam, M T, Lorimer, D R, Lynch, R S, McLaughlin, M A, Ng, C, Nice, D J, Pennucci, T T, Spiewak, R, Stairs, I H, Stovall, K, Swiggum, J K, Zhu, W W

“…Despite its importance to our understanding of physics at supranuclear densities, the equation of state (EoS) of matter deep within neutron stars remains…”
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X-ray Quasi-Periodic Eruptions from Two Previously Quiescent Galaxies by Arcodia, R, Merloni, A, Nandra, K, Buchner, J, Salvato, M, Pasham, D, Remillard, R, Comparat, J, Lamer, G, Ponti, G, Malyali, A, Wolf, J, Arzoumanian, Z, Bogensberger, D, Buckley, D A H, Gendreau, K, Gromadzki, M, Kara, E, Krumpe, M, Markwardt, C, Ramos-Ceja, M E, Rau, A, Schramm, M, Schwope, A

“…Quasi-Periodic Eruptions (QPEs) are extreme high-amplitude bursts of X-ray radiation recurring every few hours and originating near the central supermassive…”
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LIMITS ON THE STOCHASTIC GRAVITATIONAL WAVE BACKGROUND FROM THE NORTH AMERICAN NANOHERTZ OBSERVATORY FOR GRAVITATIONAL WAVES by Demorest, P B, Ferdman, R D, Gonzalez, M E, Nice, D, Ransom, S, Stairs, I H, Arzoumanian, Z, Brazier, A, BURKE-SPOLAOR, S, Chamberlin, S J

“…We present an analysis of high-precision pulsar timing data taken as part of the North American Nanohertz Observatory for Gravitational Waves (NANOGrav)…”
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Rapid Accretion State Transitions following the Tidal Disruption Event AT2018fyk by Wevers, T., Pasham, D. R., van Velzen, S., Miller-Jones, J. C. A., Uttley, P., Gendreau, K. C., Remillard, R., Arzoumanian, Z., Löwenstein, M., Chiti, A.

“…Following a tidal disruption event (TDE), the accretion rate can evolve from quiescent to near- Eddington levels and back over months{years timescales. This…”
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The 450 Day X-Ray Monitoring of the Changing-look AGN 1ES 1927+654 by Ricci, C, Loewenstein, M, Kara, E., Remillard, R, Trakhtenbrot, B, Arcavi, I, Gendreau, K C, Arzoumanian, Z, Fabian, A C., Li, R, Ho, L. C., MacLeod, C. L., Cackett, E, Altamirano, D, Gandhi, P, Kosec, P., Pasham, D., Steiner, J, Chan, C-H

“…1ES 1927+654 is a nearby active galactic nucleus (AGN) that underwent a changing-look event in early 2018, developing prominent broad Balmer lines that were…”
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The Soft State of the Black Hole Transient Source MAXI J1820+070: Emission from the Edge of the Plunge Region? by Fabian, A C, Buisson, D J, Kosec, P, Reynolds, C S, Wilkins, D R, Tomsick, J A, Walton, D J, Ghandi, P, Altamirano, D, Arzoumanian, Z, Cackett, E M, Dyda, S, Garcia, J A, Gendreau, K C, Grefenstette, B W, Homan, J, Kara, E, Ludlam, R M, Miller, J M, Steiner, J F

“…The Galactic black hole X-ray binary MAXI J1820+070 had a bright outburst in 2018 when it became the second brightest X-ray source in the sky. It was too…”
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NICER Observations Reveal that the X-ray Transient MAXI J1348-630 is a Black Hole X-ray Binary by Zhang, L, Altamirano, D, cunco, V A, Alabarta, K, Enoto, T, Homan, J, Remillard, R A, Uttley, P, Vincentelli, F M, Arzoumanian, Z, Bult, P, Gendreau, K C, Markwardt, C, Sanna, A, Strohmayer, T E, Steiner, J F, Basak, A, Neilsen, J, Tombesi, F

“…We studied the outburst evolution and timing properties of the recently discovered X-ray transient MAXI J1348−630 as observed with NICER. We produced the…”
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A NICER Look at Strong X-Ray Obscuration in the Seyfert-2 Galaxy NGC 4388 by Miller, J. M., Kammoun, E., Ludlam, R. M., Gendreau, K., Arzoumanian, Z., Cackett, E., Tombesi, F.

“…We present an analysis of the time-averaged spectrum of the Seyfert-2 active galaxy NGC 4388, obtained by NICER. The intrinsic strength of the reflection…”
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The NANOGrav 12.5 yr Data Set: Polarimetry and Faraday Rotation Measures from Observations of Millisecond Pulsars with the Green Bank Telescope by Wahl, H. M., McLaughlin, M. A., Gentile, P. A., Jones, M. L., Spiewak, R., Arzoumanian, Z., Crowter, K., Demorest, P. B., DeCesar, M. E., Dolch, T., Ellis, J. A., Ferdman, R. D., Ferrara, E. C., Fonseca, E., Garver-Daniels, N., Jones, G., Lam, M. T., Levin, L., Lewandowska, N., Lorimer, D. R., Lynch, R. S., Madison, D. R., Ng, C., Nice, D. J., Pennucci, T. T., Ransom, S. M., Ray, P., Stairs, I. H., Stovall, K., Swiggum, J. K., Zhu, W. W.

“…Abstract In this work, we present polarization profiles for 23 millisecond pulsars observed at 820 and 1500 MHz with the Green Bank Telescope as part of the…”
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The NANOGrav Nine-year Data Set: Measurement and Analysis of Variations in Dispersion Measures by Jones, M. L., McLaughlin, M. A., Lam, M. T., Cordes, J. M., Levin, L., Chatterjee, S., Arzoumanian, Z., Crowter, K., Demorest, P. B., Dolch, T., Ellis, J. A, Ferdman, R. D., Fonseca, E., Gonzalez, M. E., Jones, G., Lazio, T. J. W., Nice, D. J., Pennucci, T. T., Ransom, S. M., Stinebring, D. R., Stairs, I. H., Stovall, K., Swiggum, J. K., Zhu, W. W.

“…We analyze dispersion measure (DM) variations of 37 millisecond pulsars in the nine-year North American Nanohertz Observatory for Gravitational Waves…”
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NICER uncovers the transient nature of the type-B quasi-periodic oscillation in the black hole candidate MAXI J1348−630 by Zhang, L, Altamirano, D, Uttley, P, García, F, Méndez, M, Homan, J, Steiner, J F, Alabarta, K, Buisson, D J K, Remillard, R A, Gendreau, K C, Arzoumanian, Z, Markwardt, C, Strohmayer, T E, Neilsen, J, Basak, A

“…ABSTRACT We present a systematic spectral-timing analysis of a fast appearance/disappearance of a type-B quasi-periodic oscillation (QPO), observed in four…”
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NICER Discovers mHz Oscillations in the "Clocked" Burster GS 1826−238 by Strohmayer, T. E., Gendreau, K. C., Altamirano, D., Arzoumanian, Z., Bult, P. M., Chakrabarty, D., Chenevez, J., Guillot, S., Guver, T., Homan, J., Jaisawal, G. K., Keek, L., Mahmoodifar, S., Miller, J. M., Ozel, F.

“…We report the discovery with the Neutron Star Interior Composition Explorer (NICER) of mHz X-ray brightness oscillations from the "clocked burster" GS…”
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An Astronomical Pattern-Matching Algorithm for Computer-Aided Identification of Whale Sharks Rhincodon typus by Arzoumanian, Z., Holmberg, J., Norman, B.

“…1. The formulation of conservation policy relies heavily on demographic, biological and ecological knowledge that is often elusive for threatened species…”
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A Black Hole X-ray Binary at ~100 Hz: Multiwavelength Timing of MAXI J1820+070 with HiPERCAM and NICER by Paice, J A, Ghandi, P, Shahbaz, T, Uttley, P, Arzoumanian, Z, Charles, P A, Dhillon, V S, Gendreau, K C, Littlefair, S P, Malzac, J, Markoff, S, Marsh, T R, Misra, R, Russell, D M, Veledina, A

“…We report on simultaneous sub-second optical and X-ray timing observations of the low-mass X-ray binary black hole candidate MAXI J1820+070. The bright 2018…”
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Accretion disc cooling and narrow absorption lines in the tidal disruption event AT 2019dsg by Cannizzaro, G, Wevers, T, Jonker, P G, Pérez-Torres, M A, Moldon, J, Mata-Sánchez, D, Leloudas, G, Pasham, D R, Mattila, S, Arcavi, I, Decker French, K, Onori, F, Inserra, C, Nicholl, M, Gromadzki, M, Chen, T-W, Müller-Bravo, T E, Short, P, Anderson, J P, Young, D R, Gendreau, K C, Arzoumanian, Z, Löwenstein, M, Remillard, R, Roy, R, Hiramatsu, D

“…ABSTRACT We present the results of a large multiwavelength follow-up campaign of the tidal disruption event (TDE) AT 2019dsg, focusing on low to high…”
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The Velocity Distribution of Isolated Radio Pulsars by Arzoumanian, Z, Chernoff, D. F, Cordes, J. M

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THE NANOGRAV NINE-YEAR DATA SET: EXCESS NOISE IN MILLISECOND PULSAR ARRIVAL TIMES by Lam, M. T., Cordes, J. M., Chatterjee, S., Arzoumanian, Z., Crowter, K., Demorest, P. B., Dolch, T., Ellis, J. A, Ferdman, R. D., Fonseca, E., Gonzalez, M. E., Jones, G., Jones, M. L., Levin, L., Madison, D. R., McLaughlin, M. A., Nice, D. J., Pennucci, T. T., Ransom, S. M., Shannon, R. M., Siemens, X., Stairs, I. H., Stovall, K., Swiggum, J. K., Zhu, W. W.

“…ABSTRACT Gravitational wave (GW) astronomy using a pulsar timing array requires high-quality millisecond pulsars (MSPs), correctable interstellar propagation…”
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A NICER Look at the State Transitions of the Black Hole Candidate MAXI J1535-571 During its Reflares by Cuneo, V A, Alabarta, K, Zhang, L, Altamirano, Diego, Mendez, M, Padilla, M Armas, Remillard, R, Homan, J, Steiner, J F, Combi, J A, Munoz-Darias, T, Gendreau, K C, Arzoumanian, Z, Stevens, A L, Loewenstein, M, Tombesi, F, Bult, P, Fabian, A C, Buisson, D J K, Neilsen, J, Basak, A

“…The black hole candidate and X-ray binary MAXI J1535−571 was discovered in 2017 September. During the decay of its discovery outburst, and before returning to…”
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The SUrvey for Pulsars and Extragalactic Radio Bursts - IV. Discovery and polarimetry of a 12.1-s radio pulsar by Morello, V, Keane, E F, Enoto, T, Guillot, S, Ho, W C G, Jameson, A, Kramer, M, Stappers, B W, Bailes, M, Barr, E D, Bhandari, S, Caleb, M, Flynn, C M L, Jankowski, F, Johnston, S, Straten, W van, Arzoumanian, Z, Bogdanov, S, Gendreau, K C, Malacaria, C, Ray, Paul S., Remillard, R A

“…We report the discovery of PSR J2251−3711, a radio pulsar with a spin period of 12.1 s, the second longest currently known. Its timing parameters imply a…”
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