Items where Author is "Alpar, M. Ali"

Niang, Ndiogou and Ertan, Ünal and Gençali, Ali Arda and Toyran, Ozan and Ulubay, Ayşe and Devlen, Ebru and Alpar, M. Ali and Gügercinoğlu, Erbil (2024) On the lack of X-ray pulsation in most neutron star low-mass X-ray binaries. Monthly Notices of the Royal Astronomical Society, 532 (2). pp. 2133-2142. ISSN 0035-8711 (Print) 1365-2966 (Online)

Gençali, Ali Arda and Ertan, Ünal and Alpar, M. Ali (2023) Evolution of the long-period pulsar PSR J0901-4046. Monthly Notices of the Royal Astronomical Society: Letters, 520 (1). L11-L15. ISSN 1745-3925 (Print) 1745-3933 (Online)

Gençali, Ali Arda and Ertan, Ünal and Alpar, M. Ali (2022) Evolution of the long-period pulsar GLEAM-X J162759.5-523504.3. Monthly Notices of the Royal Astronomical Society: Letters, 513 (1). L68-L71. ISSN 1745-3925 (Print) 1745-3933 (Online)

Gençali, Ali Arda and Niang, Ndiogou and Toyran, Ozan and Ertan, Ünal and Ulubay, A. and Şaşmaz, S. and Devlen, E. and Vahdat, A. and Özcan, S. and Alpar, M. Ali (2022) The torque reversals of 4U 1626-67. Astronomy and Astrophysics, 658 . ISSN 0004-6361 (Print) 1432-0746 (Online)

Ertan, Ünal and Alpar, M. Ali (2021) The minimum rotation period of millisecond pulsars. Monthly Notices of the Royal Astronomical Society: Letters, 505 (1). L112-L114. ISSN 1745-3925 (Print) 1745-3933 (Online)

Gügercinoğlu, Erbil and Alpar, M. Ali (2020) The 2016 Vela glitch: a key to neutron star internal structure and dynamics. Monthly Notices of the Royal Astronomical Society, 496 (2). pp. 2506-2515. ISSN 0035-8711 (Print) 1365-2966 (Online)

Erkut, M. H. and Türkoğlu, M. A. and Ekşi, K. Y. and Alpar, M. Ali (2020) On the magnetic fields, beaming fractions, and fastness parameters of pulsating ultraluminous x-ray sources. Astrophysical Journal, 899 (2). ISSN 0004-637X (Print) 1538-4357 (Online)

Gügercinoğlu, Erbil and Alpar, M. Ali (2019) The largest Crab glitch and the vortex creep model. Monthly Notices of the Royal Astronomical Society, 488 (2). pp. 2275-2282. ISSN 0035-8711 (Print) 1365-2966 (Online)

Erkut, M. Hakan and Ekşi, K. Yavuz and Alpar, M. Ali (2019) Ultra-luminous x-ray sources as super-critical propellers. Astrophysical Journal, 873 (2). ISSN 0004-637X (Print) 1538-4357 (Online)

Akbal, Onur and Alpar, M. Ali (2018) Minimum glitch of the Crab pulsar and the crustquake as a trigger mechanism. Monthly Notices of the Royal Astronomical Society, 473 (1). pp. 621-624. ISSN 0035-8711 (Print) 1365-2966 (Online)

Alpar, M. Ali and Gügercinoğlu, Erbil (2017) Neutron star dynamics under time dependent external torques. In: 11th International Conference Physics of Neutron Stars - 50 Years After, Saint Petersburg, Russia

Alpar, M. Ali (2017) Flux-vortex pinning and neutron star evolution. Journal of Astrophysics and Astronomy, 38 (3). ISSN 0250-6335 (Print) 0973-7758 (Online)

Akbal, Onur and Alpar, M. Ali and Buchner, Sarah and Pines, David (2017) Nonlinear interglitch dynamics, the braking index of the Vela pulsar and the time to the next glitch. Monthly Notices of the Royal Astronomical Society, 469 (4). pp. 4183-4192. ISSN 0035-8711 (Print) 1365-2966 (Online)

Ertan, Ünal and Çalışkan, Şirin and Alpar, M. Ali (2017) Optical excess of dim isolated neutron stars. Monthly Notices of the Royal Astronomical Society, 470 (1). pp. 1253-1258. ISSN 0035-8711 (Print) 1365-2966 (Online)

Gügercinoğlu, Erbil and Alpar, M. Ali (2017) Neutron star dynamics under time-dependent external torques. Monthly Notices of the Royal Astronomical Society, 471 (4). pp. 4827-4831. ISSN 0035-8711 (Print) 1365-2966 (Online) Published Online First http://dx.doi.org/10.1093/mnras/stx1937

Gügercinoğlu, Erbil and Alpar, M. Ali (2016) Microscopic vortex velocity in the inner crust and outer core of neutron stars. Monthly Notices of the Royal Astronomical Society, 462 (2). pp. 1453-1460. ISSN 0035-8711 (Print) 1365-2966 (Online)

Alpar, M. Ali (2016) QPO frequency derivative-frequency correlation indicates non-Keplerian boundary layer with a maximum in rotation rate. Monthly Notices of the Royal Astronomical Society, 462 (1). L98-L100. ISSN 0035-8711 (Print) 1365-2966 (Online)

Göğüş, Ersin and Lin, Lin and Kaneko Göğüş, Yuki and Kouveliotou, Chryssa and Watts, Anna L. and Chakraborty, Manoneeta and Alpar, M. Ali and Huppenkothen, Daniela and Roberts, Oliver J. and Younes, George and Van der Horst, Alexander J. (2016) Magnetar-like x-ray bursts from a rotation-powered pulsar, PSR J1119-6127. Astrophysical Journal Letters, 829 (2). L25-L25. ISSN 2041-8205 (Print) 2041-8213 (Online)

Feroci, Marco and Kalemci, Emrah and Alpar, M. Ali and Göğüş, Ersin (2016) The LOFT mission concept: a status update. In: Conference on Space Telescopes and Instrumentation - Ultraviolet to Gamma Ray, Edinburgh, Scotland

Üçer Şaylan, Defne and Sayers, Zehra and Alpar, M. Ali (2016) Bir çekirdek eğitim programı hikayesi: temel geliştirme programı (story of a core curriculum). (Accepted)

Akbal, Onur and Gügercinoğlu, Erbil and Şaşmaz Muş, Sinem and Alpar, M. Ali (2015) Peculiar glitch of PSR J1119-6127 and extension of the vortex creep model. Monthly Notices of the Royal Astronomical Society, 449 (1). pp. 933-941. ISSN 0035-8711 (Print) 1365-2966 (Online)

Ertan, Ünal and Çalışkan, Şirin and Benli, Onur and Alpar, M. Ali (2014) Long-term evolution of dim isolated neutron stars. Monthly Notices of the Royal Astronomical Society, 444 (2). pp. 1559-1565. ISSN 0035-8711 (Print) 1365-2966 (Online)

Gügercinoğlu, Erbil and Alpar, M. Ali (2014) Vortex creep against toroidal flux lines, crustal entrainment, and pulsar glitches. Astrophysical Journal Letters, 788 (1). ISSN 2041-8205 (Print) 2041-8213 (Online)

Benli, Onur and Çalışkan, Şirin and Ertan, Ünal and Alpar, M. Ali and Trümper, J. E. and Kylafis, N. D. (2013) X-ray enhancement and long-term evolution of swift J1822.3-1606. Astrophysical Journal, 778 (2). ISSN 0004-637X (Print) 1538-4357 (Online)

Çalışkan, Şirin and Ertan, Ünal and Alpar, M. Ali and Trümper, J. E. and Kylafis, N. D. (2013) On the evolution of the radio pulsar PSR J1734-3333. Monthly Notices of the Royal Astronomical Society, 431 (2). pp. 1136-1142. ISSN 0035-8711 (Print) 1365-2966 (Online)

Alpar, M. Ali and Çalışkan, Şirin and Ertan, Ünal (2012) Fallback disks, magnetars and other neutron stars. In: Feeding Compact Objects: Accretion on All Scales, (Accepted)

Ertan, Ünal and Çalışkan, Şirin and Alpar, M. Ali (2012) Genç nötron yıldızı sistemlerinin yayılma diskleriyle evrimi. In: XVIII. Ulusal Astronomi ve Uzay Bilimleri Kongresi, İnönü Üniversitesi, Malatya

Alpar, M. Ali (2012) On kHz oscillations and characteristic frequencies of accreting magnetospheres. Monthly Notices of the Royal Astronomical Society, 423 (4). pp. 3768-3774. ISSN 0035-8711 (Print) 1365-2966 (Online)

Patruno, Alessandro and Alpar, M. Ali and Van der Klis, Michiel and Van den Heuvel, Ed P. J. (2012) The peculiar evolutionary history of IGR J17480-2446 in Terzan 5. The Astrophysical Journal, 752 (1). ISSN 0004-637X (Print) 1538-4357 (Online)

Alpar, M. Ali (2012) Nötron yıldızlarında üstünakışkanlık ve üstüniletkenlik. In: Akyüz, Asuman and Dayı, Ömer Faruk and Durukanoğlu Feyiz, Sondan and Özbek, Sevtap Yıldız, (eds.) Anı Kitabı: Bilim, Kişi ve Toplum Üzerine Çalışmalar. Sabancı Üniversitesi Yayınları. Sabancı Üniversitesi, İstanbul, pp. 94-97. ISBN 9786054348213

Ertan, Ünal and Çalışkan, Şirin and Ekşi, Kazım Yavuz and Erkut, Mehmet Hakan and Alpar, M. Ali (2011) A natural limit on the observable periods of anomalous x-ray pulsars and soft gamma-ray repeaters. In: Astrophysics of Neutron Stars 2010: A Conference in Honor of M. Ali Alpar, Çeşme, Izmir

Feroci, Marco and Stella, L. and Van der Klis, M. and Courvoisier, T. J.-L. and Hernanz, M. and Hudec, R. and Santangelo, A. and Walton, D. and Zdziarski, A. and Barret, D. and Belloni, T. and Braga, J. and Brandt, S. and Budtz-Jrgensen, C. and Campana, S. and Den Herder, J.-W. and Huovelin, J. and Israel, G. L. and Pohl, M. and Ray, P. and Vacchi, A. and Zane, S. and Argan, A. and Attina, P. and Bertuccio, G. and Bozzo, E. and Campana, R. and Chakrabarty, D. and Costa, E. and De Rosa, A. and Del Monte, E. and Di Cosimo, S. and Donnarumma, I. and Evangelista, Y. and Haas, D. and Jonker, P. and Korpela, S. and Labanti, C. and Malcovati, P. and Mignani, R. and Muleri, F. and Rapisarda, M. and Rashevsky, A. and Rea, N. and Rubini, A. and Tenzer, C. and Wilson-Hodge, C. and Winter, B. and Wood, K. and Zampa, G. and Zampa, N. and Abramowicz, M. A. and Alpar, M. Ali and Altamirano, D. and Alvarez, J. M. and Amati, L. and Amoros, C. and Antonelli, L. A. and Artigue, R. and Azzarello, P. and Bachetti, M. and Baldazzi, G. and Barbera, M. and Barbieri, C. and Basa, S. and Baykal, A. and Belmont, R. and Boirin, L. and Bonvicini, V. and Burderi, L. and Bursa, M. and Cabanac, C. and Cackett, E. and Caliandro, G. A. and Casella, P. and Chaty, S. and Chenevez, J. and Coe, M. J. and Collura, A. and Corongiu, A. and Covino, S. and Cusumano, G. and D'Amico, F. and Dall'Osso, S. and De Martino, D. and De Paris, G. and Di Persio, G. and Di Salvo, T. and Done, C. and Dovciak, M. and Drago, A. and Ertan, Ünal and Fabiani, S. and Falanga, M. and Fender, R. and Ferrando, P. and Della Monica Ferreira, D. and Fraser, G. and Frontera, F. and Fuschino, F. and Galvez, J. L. and Gandhi, P. and Giommi, P. and Godet, O. and Göğüş, Ersin and Goldwurm, A. and Götz, D. and Grassi, M. and Guttridge, P. and Hakala, P. and Henri, G. and Hermsen, W. and Horak, J. and Hornstrup, A. and In 't Zand, J. J. M. and Isern, J. and Kalemci, Emrah and Kanbach, G. and Karas, V. and Kataria, D. and Kennedy, T. and Klochkov, D. and Kluzniak, W. and Kokkotas, K. and Kreykenbohm, I. and Krolik, J. and Kuiper, L. and Kuvvetli, I. and Kylafis, N. and Lattimer, J. M. and Lazzarotto, F. and Leahy, D. and Lebrun, F. and Lin, D. and Lund, N. and Maccarone, T. and Malzac, J. and Marisaldi, M. and Martindale, A. and Mastropietro, M. and McClintock, J. and McHardy, I. and Mendez, M. and Mereghetti, S. and Miller, M. C. and Mineo, T. and Morelli, E. and Morsink, S. and Motch, C. and Motta, S. and Munoz Darias, T. and Naletto, G. and Neustroev, V. and Nevalainen, J. and Olive, J. F. and Orio, M. and Orlandini, M. and Orleanski, P. and Ozel, F. and Pacciani, L. and Paltani, S. and Papadakis, I. and Papitto, A. and Patruno, A. and Pellizzoni, A. and Petracek, V. and Petri, J. and Petrucci, P. O. and Phlips, B. and Picolli, L. and Possenti, A. and Psaltis, D. and Rambaud, D. and Reig, P. and Remillard, R. and Rodriguez, J. and Romano, P. and Romanova, M. and Schanz, T. and Schmid, C. and Segreto, A. and Shearer, A. and Smith, A. and Smith, P. J. and Soffitta, P. and Stergioulas, N. and Stolarski, M. and Stuchlik, Z. and Tiengo, A. and Torres, D. and Török, G. and Turolla, R. and Uttley, P. and Vaughan, S. and Vercellone, S. and Waters, R. and Watts, A. and Wawrzaszek, R. and Webb, N. and Wilms, J. and Zampieri, L. and Zezas, A. and Ziolkowski, J. (2011) The large observatory for x-ray timing (LOFT). Experimental Astronomy (Sl), 34 (2). pp. 415-444. ISSN 1572-9508

Alpar, M. Ali and Ertan, Ünal and Çalışkan, Şirin (2011) SGR 0418+5729 - How does a young neutron star spin down to a 9 s period with a dipole field less than 10(13) G? The Astrophysical Journal Letters, 732 (1). L4-L7. ISSN 0004-637X

Sidery, Trevor Llyod and Alpar, M. Ali (2009) The effect of quantized magnetic flux lines on the dynamics of superfluid neutron star cores. Monthly Notices of the Royal Astronomical Society, 400 (4). pp. 1859-1867. ISSN 0035-8711

Ertan, Ünal and Ekşi, Kazım Yavuz and Erkut, Mehmet Hakan and Alpar, M. Ali (2009) On the evolution of anomalous x-ray pulsars and soft gamma-ray repeaters with fall back disks. The Astrophysical Journal, 702 (2). pp. 1309-1320. ISSN 0004-637X

Erdeve, Işıl and Kalemci, Emrah and Alpar, M. Ali (2009) Hard X-Ray flux upper limits of central compact objects in supernova remnants. The Astrophysical Journal, 696 (2). pp. 1792-1797. ISSN 0004-637X

Göğüş, Ersin and Alpar, M. Ali and Gilfanov, Marat (2007) Is the lack of pulsations in low mass X-Ray binaries due to comptonizing coronae? The Astrophysical journal, 659 (1). pp. 580-584. ISSN 0004-637X

Ertan, Ünal and Alpar, M. Ali and Erkut, Mehmet Hakan and Ekşi, K. Y. and Çalışkan, Ş. (2007) Anomalous X-ray pulsars: persistent states with fallback disks. Astrophysics and Space Science, 308 (1-4). pp. 73-77. ISSN 0004-640X (Print) 1572-946X (Online)

Alpar, M. Ali (2007) Dim isolated neutron stars, cooling and energy dissipation. Astrophysics and Space Science, 308 (1-4). pp. 133-136. ISSN 0004-640X (Print) 1572-946X (Online)

Ertan, Ünal and Erkut, Mehmet Hakan and Ekşi, Kazım Yavuz and Alpar, M. Ali (2007) The anomalous X-ray pulsar 4U 0142+61: a neutron star with a gaseous fallback disk. The Astrophysical Journal, 657 (1). pp. 441-447. ISSN 0004-637X (Print) 1538-4357 (Online)

Alpar, M. Ali and Ertan, Ünal and Erkut, M. Hakan and Ekşi, Kazım. Yavuz and Çalışkan, Şirin (2006) On fallback disks and magnetars. In: The 36th COSPAR Scientific Assembly- on Space Research, Beijing, China (Accepted)

Alpar, M. Ali and Baykal, Altan (2006) Pulsar braking indices, glitches and energy dissipation in neutron stars. Monthly notices of the Royal Astronomical Society, 372 (1). pp. 489-496. ISSN 0035-8711

Ertan, Ünal and Ekşi, Kazım Yavuz and Erkut, M. Hakan and Alpar, M. Ali (2006) The anomalous x-ray pulsar 4U 0142+61: a neutron star with a gaseous fallback disk. In: Isolated Neutron Stars from the Interior to the Surface, London, UK (Accepted)

Ertan, Ünal and Göğüş, Ersin and Alpar, M. Ali (2006) X-ray and infrared enhancement of anomalous x-ray pulsar 1E 2259+586. The Astrophysical journal, 640 (1). pp. 435-440. ISSN 0004-637X

Alpar, M. Ali (2005) Neutron star superfluidity, dynamics and precession. In: 6th NATO-Advanced-Study-Institute on Electromagnetic Spectrum of Neutron Stars, Marmaris, Turkey

Ekşi, Kazım Yavuz and Alpar, M. Ali (2005) Disks surviving the radiation pressure of radio pulsars. Astrophysical Journal, 620 (1). pp. 390-397. ISSN 0004-637X

Erkut, Mehmet Hakan and Alpar, M. Ali (2004) On the rotational dynamics of magnetically threaded disks around neutron stars. Astrophysical Journal, 617 (1). pp. 461-470. ISSN 0004-637X

Ertan, Ünal and Alpar, M. Ali (2004) On the enhanced X-ray emission from SGR 1900+14 after the August 27th giant flare. In: 2nd BeppoSAX Conference on Restless High-Engery Universe, Amsterdam, Netherlands

Ekşi, Kazım Yavuz and Alpar, M. Ali (2004) Thin disk models of anomalous X-ray pulsars. In: 2nd BeppoSAX Conference on Restless High-Engery Universe, Amsterdam, Netherlands

Ögelman, H. and Alpar, M. Ali (2004) Constraints on a putative pulsar in SN 1987A. Astrophysical Journal, 603 (1). L33-L35. ISSN 0004-637X

Ekşi, Kazım Yavuz and Alpar, M. Ali (2003) Can thin disks produce anomalous X-ray pulsars? Astrophysical Journal, 599 (1). pp. 450-456. ISSN 0004-637X

Ertan, Ünal and Alpar, M. Ali (2003) On the enhanced X-ray emission from SGR 1900+14 after the August 27 giant flare. Astrophysical Journal, 593 (2). L93-L96. ISSN 0004-637X

Ertan, Ünal and Alpar, M. Ali (2002) On the outbursts of black hole soft x-ray transients. Astronomy and Astrophysics, 393 (1). pp. 205-214. ISSN 0004-6361 (Print) 1432-0746 (Online)

Baykal, Altan and İnam, Çağdaş and Alpar, M. Ali and Zand, Jean and Strohmayer, Tod (2001) The steady spin-down rate of 4U 1907+09. Monthly Notices of the Royal Astronomical Society, 327 (4). pp. 1269-1272. ISSN 0035-8711 (Print) 1365-2966 (Online)

Alpar, M. Ali and Ankay, Aşkın and Yazgan, Efe (2001) Pulsar spin-down by a fallback disk and the P-P diagram. Astrophysical Journal, 557 (issue ). L61-L65. ISSN 0004-637X (Print) 1538-4357 (Online)

Alpar, M. Ali (2001) On young neutron stars as propellers and accretors with conventional magnetic fields. Astrophysical Journal, 554 (issue ). pp. 1245-1254. ISSN 0004-637X (Print) 1538-4357 (Online)

Baykal, Altan and Strohmayer, Tod and Swank, Jean and Alpar, M. Ali and Stark, Michael J. (2000) Differences between the two anomalous X-ray pulsars: variations in the spin-down rate of 1E 1048.1-5937 and an extended interval of quiet spin-down in 1E 2259+586. Monthly Notices of the Royal Astronomical Society, 319 (1). pp. 205-208. ISSN 0035-8711