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Mehmet Ali AlparFaculty of Engineering and Natural SciencesEmeritus Faculty Member(216) 483

Emeritus Faculty Member


B.Sc. in Physics, Middle East Technical University (METU), 1972; Ph.D. in Physics, Cambridge University (England), 1977.

Areas of Interest

Neutron Stars. Pulsars. X-ray binaries. Fallback disks.


The Science Academy - Turkey (2011- , President) Türkiye Bilimler Akademisi (1993- resigned: 2011) Academia Europaea American Philosophical Society Türk Astronomi Derneği European Astronomical Society

Book Section / Chapter
Publications Prior to SU


1."Lifetime Effect on the Superfluidity in Neutron Stars"

  Naoki Itoh & M. A. Alpar,  J. Phys. A7, 1970 (1974).

2."Positively Charged Isospin Wave Softening & Proton Lattice in Neutron Stars"

  P.W. Anderson, N.Itoh, M.A.Alpar, E.Tosatti, & R.G.Palmer, Lett. Nuovo Cimento  12 , ser.2., 165 (1975).

3."Pinning and Threading of Quantized Vortices in the Pulsar Crust Superfluid"

  M.Ali Alpar, Ap.J. 213, 527 (1977).

4."Relaxation of Rotating He II Following  a Spin-up of Its Container:

  A Superfluid Ekman Time?" M. Ali Alpar, J. Low Temp. Phys. 31, 803 (1978).

5."Modulation of Short-period Oscillations and Colour Asymmetry in Pulsed

  Emission Lines: A Structural Interpretation of Recent Observations of DQ Her"

  M. Ali Alpar, M.N.R.A.S.189, 305 (1979).

6."Pinned Vorticity in Rotating Superfluids with Application to Neutron Stars"

  D.Pines, J.Shaham, M.Ali Alpar & P.W. Anderson,

  Progress of Theoretical Physics Supplement 69, 376 (1981).

7."Giant Glitches and Pinned Vorticity in the Vela and Other Pulsars"

  M. Ali Alpar, P.W. Anderson, D. Pines & J. Shaham,

  Ap. J. Letters, 249, L29 (1981).

8."Glitches and Pinned Vorticity in the Crab Pulsar"

  M. Ali Alpar, P.W. Anderson, D. Pines & J. Shaham,

  Proc. Nat. Acad. Sci. USA 78, 5299 (1981).

9."The Rheology of Neutron Stars: Vortex Line Pinning in the Crust Superfluid"

  P.W.Anderson,A.Alpar,D.Pines &J.Shaham,Phil.Mag.A45,227(1982).


10."A New Class of Radio Pulsars"

  M.Ali Alpar, A.F. Cheng, M.A.Ruderman & J. Shaham, Nature 300, 728, (1982).


11."Expectancy of Large Pulsar Glitches"

  M.Ali Alpar & Cheng Ho, M.N.R.A.S. 204, 655 (1983).


12."Vortex Creep and the Internal Temperature of Neutron Stars:

  I. General Theory" M.A.Alpar,P.W.Anderson,D.Pines & J.Shaham,

  Ap. J. 276,325(1984).

13."Vortex Creep and the Internal Temperature of Neutron Stars:

  II.The Vela Pulsar" M.A.Alpar,P.W.Anderson,D.Pines & J.Shaham,

  Ap.J. 278,791(1984).


14."Rapid Postglitch Spin-up of the Superfluid Core in Pulsars"

  M.A.Alpar, S.A.Langer & J.A.Sauls, Astrophysical Journal, 282, 533 (1984).


15."Vortex Creep and the Internal Temperature of Neutron Stars:

  The Crab Pulsar and PSR0525+21"

  M.A.Alpar,R.Nandkumar & D.Pines,Ap.J.,288,191(1985).

16."Gravitational Radiation from a Solid Crust Neutron Star"

  M.Ali Alpar  & David Pines, Nature, 314, 334 (1985).


17."Separable Solutions for a Rotating Superfluid-Normal Fluid System"

  M.A.Alpar & K.S. Cheng, Journ. Low Temp. Phys.,60, 415 (1985).


18."Superfluidity in Neutron Stars"

  David Pines & M.Ali Alpar, Nature, 316, 27 (1985).


20."Is GX 5-1 a Millisecond Pulsar?"

  M.A.Alpar & J.Shaham, Nature, 316, 239 (1985).


21."Quasiperiodic Oscillations in Bright Galactic-bulge X-ray Sources"

  F.K.Lamb, N. Shibazaki, M.A.Alpar & J.Shaham, Nature, 317, 681 (1985).

22."Vortex Creep and the Internal Temperature of Neutron Stars:

  Timing Noise in Pulsars" M.Ali Alpar, Radha Nandkumar & David Pines,

  Ap. J. 311, 197 (1986) .

23."Model QPO Power Spectra: Signatures of Angular Position and Radial Velocity   of Clumps in the Boundary Layer"

  M.Ali Alpar, M.N.R.A.S. 223,469 (1986).

24."A Search for X-ray Emission from a Nearby Pulsar : PSR 1929+10" .

  M.A.Alpar, W.Brinkmann, U.Kiziloglu,H.Ogelman & D.Pines,A&A,177,101 (1987).

25."Comment on Strange Stars" M.A.Alpar, Phys. Rev. Lett., 58,2152 (1987).

26."Neutron Star Precession and the Dynamics of the Superfluid Interior"

  M.Ali Alpar & H.Ogelman, Astronomy & Astrophysics 185, 196 (1987).

27."On the Dynamical Coupling between the Superfluid Interior

  and the Crust of a Neutron Star" M.A.Alpar & J.A.Sauls,

  Ap.J. 327, 723 (1988).

28."The Large Glitch from PSR 0355+54 and its Postglitch Relaxation"

  M.A.Alpar, K.S.Cheng, D.Pines & J.Shaham, M.N.R.A.S. 233, 25 (1988).

29."Spontaneous Superfluid Unpinning and the Inhomogeneous Distribution of

  Vortex Lines in Neutron Stars" K.S. Cheng, M.A. Alpar, D. Pines & J. Shaham,

  Ap.J. 330, 835  (1988).

30."The Remnant's Rapid Heartbeat" M.A.Alpar, I.Fushiki, F.K.Lamb, G.S.Miller,

  M.-G. Park & D. Pines, Nature 338, 295 (1989).

31."Vortex Creep and the Internal Temperature of Neutron Stars:

  Linear and Nonlinear Response to a Glitch" M.A. Alpar, K.S. Cheng & D.Pines,

  Ap.J. 346, 823 (1989).

32."Spin-up of Young Pulsars due to Rapid Cooling by Neutrino Emission"

  M.Ali Alpar & Hakki B. Ogelman, Ap.J. Letters 349, L55 (1990).

33."On the Fast Recovery of the Vela Pulsar from its Christmas 1988 Glitch",

  M.A.Alpar, K.S. Cheng and D.Pines, Nature 348 ,707 (1990).

34."A Shot Noise Model for a Two Component  Neutron Star"

  A.Baykal, M.A.Alpar and U.Kiziloglu, Astronomy & Astrophysics 185, 196 (1991).


35."6 Hz QPOs from Low Mass X-ray Binaries: the Sound of an Accretion Disk?"

  M.A.Alpar, G.Hasinger, J.Shaham and S.Yancopoulos,

  Astronomy & Astrophysics 257, 627 (1992).


36."Postglitch Relaxation of the Vela Pulsar after its First Eight Glitches:

  A Re-evaluation with the Vortex Creep Model"

  M.A.Alpar, H.F.Chau, K.S.Cheng and D.Pines, Ap. J. 409,345 (1993).

37."Implications of the Crustal Moment of Inertia for

  Neutron Star Equations of State", B.Datta and M.A.Alpar,

  Astronomy and Astrophysics 275, 210 (1993).

38."Is Geminga a Glitching Pulsar?" M.A.Alpar, H.Ogelman and J.Shaham,

  Astronomy and Astrophysics 273, L35 (1993).

39."Postglitch Relaxation of the Crab Pulsar:

  Evidence for Crust Cracking" M.A.Alpar, H.F.Chau, K.S.Cheng and D.Pines,

  Ap. J. Letters 427, L29 (1994).

40."Expectancy of Large Pulsar Glitches: A Comparison of Models with

  the Observed Glitch Sample" M.Ali Alpar and Altan Baykal,

  M.N.R.A.S. 269,849(1994).

41."On the Distribution and Evolution of Pulsars",

  M.A.Alpar, F.Gok, O.Huseyinov and U.Kiziloglu,

  Turkish J. of Phys. 18, 970 (1994).

42."A Search for X-Rays from Five Pulsars: PSR's 0740-28, 1737-30,

 1822-09, 1915+13 and 1916+14"

 M.A.Alpar,O.H.Guseinov, U.Kiziloglu and H.Ogelman

 Astronomy and Astrophysics, 297, 470 (1995).

43."X-ray Variability and 1mHz Oscillations in TT Arietis"

 A.Baykal,A.Esendemir,U.Kiziloglu,M.A.Alpar,H.Ogelman,N.Ercan and G.Ikis

 Astronomy and Astrophysics, 299, 421 (1995).

44."Postglitch Relaxation of the Crab Pulsar After its Four Major

Glitches: The Combined Effects of Crust Cracking, Formation of Vortex

Depletion Regions and Vortex Creep"

 M.A.Alpar, H.F.Chau, K.S.Cheng and D.Pines

 Ap.J. 459, 706 (1996).

45. "On Pulsar Velocities and Pulsar Supernova Remnant Associations"

 A.O. Allakhverdiev, M.A. Alpar, F. Gok and O.H. Guseinov

 Turkish J. of Phys., 21, 688 (1997).

46. "AB Dor: an Almost Single Star with RS CVn-like Activity in the

 X-ray Band", M. Alev, M.A.Alpar, A. Esendemir, U. Kiziloglu,

 Astrophysics and Space Sci., 245, 15 (1996).


47. "Modelling of Quasi Periodic Oscillations with Wave Packets"

 M.A. Alpar and A. Yilmaz, New Astronomy, 2, 225 (1997).


48. "On the Outburst Light Curves of Soft X-Ray Transients as Response

 of the Accretion Disk to Mass Deposition", Ü. Ertan and M. A. Alpar,

 Astronomy and Astrophysics  336, 220 (1998).


49. "Planetary Nebulae in Open Clusters and the Mass Boundary Between

the Progenitors of White Dwarfs and Neutron Stars"

 A.O. Allakhverdiev, M.A. Alpar, O.H. Guseinov and E. Tuncer

 Astronomical and Astrophysical Transactions, 16, 41 (1998).


50. "The Timing Noise of PSR 0823+26, 1706-16, 1749-28, 2021+51 and the

Anomalous Braking Indices"

 A. Baykal, M.A.Alpar, P.E.Boynton and J.E.Deeter,

 M.N.R.A.S. 306, 207 (1999).


51. "ROSAT Observations of the Vela Pulsar"

 F. Seward, M.A. Alpar, C. Flanagan, Ü. Kızıloğlu, C. Markwardt

 P. McCulloch and H. Ögelman, ApJ 536, 948 (2000).


52. "Post-glitch RXTE-PCA Observations of the Vea Pulsar"

 M.A. Gürkan, A. Baykal, M.A.Alpar, H. Ögelman and T. Strohmayer,

 Astronomy and Astrophysics 356, 1136 (2000).


53. "Differences between Two Anomalous X-ray Pulsars..."

 A. Baykal, T. Strohmayer, J. Swank, M.A. Alpar, M.J. Stark,

 M.N.R.A.S. 319, 205 (2000).


54. "On Young Neutron Stars as Propellers and Accretors with Conventional Magnetic Fields", M.A. Alpar,Ap.J. 554, 1245 (2001).


55.  "Pulsar Spindown by a Fallback Disk and the P-Pdot Diagram"

 M.A. Alpar, A. Ankay and E. Yazgan,

 Ap. J. Letters, 557, L61 (2001).


56. "The Steady Spin Down Rate of 4U 1907+09"

 A. Baykal, Ç. İnam, M.A. Alpar, J. J. In't Zand, T. Strohmayer,

 J. Swank, M.N.R.A.S. 327, 1269 (2001).


57. "On the outbursts of black hole soft X-ray transients"

 Ü. Ertan and M.A. Alpar

 Astronomy and Astrophysics 393,205 (2002).


58. "First Hours of the GRB 030329 Optical Afterglow"

 R.A. Burenin, R.A. Sunyaev, M.N. Pavlinsky, D.V. Denissenko,

 O.V. Terekhov, A. Yu. Tkachenko, Z. Aslan, I. Khamitov, K. Uluç,

 M.A. Alpar, Ü. Kızıloğlu, A. Baykal, I. Bikmaev, N. Sakhibullin,

 V. Suleymanov, Astronomy Letters 29/9, 1 (2003).


59. "On the Enhanced X-Ray Emission from SGR 1900+14 after the August 27 Giant Flare"

 Ü. Ertan and M.A. Alpar, Ap.J. Letters 593, L93 (2003).


60. "Can thin disks produce Anomalous X-ray Pulsars?"

 Y. Ekşi and M.A. Alpar, Ap.J. 599, 450 (2003).


61. "Constraints on a Putative Pulsar in SN 1987A"

 H. Ögelman and M.A. Alpar, Ap.J. Letters 603, L33 (2004).


62. "On the Rotational Dynamics of Magnetically Threaded Disks Around Neutron Stars"

 M. H. Erkut and M.A. Alpar, Ap.J. 617, 461 (2004).


63. "Disks Surviving the Radiation Pressure of Radio Pulsars"

 Y. Ekşi and M.A. Alpar, Ap.J. 620, 390 (2005).


64. "X-Ray and Infrared Enhancement of Anomalous X-ray Pulsar 1E  2259+58"  Ü. Ertan, E. Göğüş and M.A. Alpar, Ap.J. 640, 435 (2006).


65. "Pulsar Braking Indices, Glitches and Energy Dissipation in Neutron Stars", M.Ali Alpar and Altan Baykal,

M.N.R.A.S. 372,489 (2006).


66. "The Anomalous X-Ray Pulsar 4U 0142+61: A Neutron Star with a Gaseous Fallback Disk",

Ertan, Ü., Erkut, M.H., Ekşi, K.Y., Alpar, M.A.,

Ap.J. 657, 441 (2007).


67. "Is the Lack of Pulsations in Low-mass X-ray Binaries due to Comptonizing Coronae?" E. Göğüş, M.A. Alpar and M. Gilfanov,

  Ap.J. 659, 580 (2007).


68. Quasi-periodic Oscillations as Global Hydrodynamic Modes in the Boundary Layers of Viscous Accretion Disks”  Erkut, M.H., Psaltis, D. and Alpar, M.A.,

Ap.J. 687, 1220 (2008).


69. “The Highest Dynamical Frequency in the Inner Region of an Accretion Disc”

Alpar, M.A. and Psaltis, D., M.N.R.A.S. 391, 1472 (2008).


70. "Hard X-Ray Flux Upper Limits of Central Compact Objects in Supernova Remnants", I. Erdeve, E. Kalemci

& M.Ali Alpar, Ap.J. 696,1792 (2009).


71. "On the Evolution of Anomalous X-Ray Pulsars and Soft Gamma-Ray Repeaters with Fall Back Disks", Ü.Ertan, K.Y. Ekşi, M.H. Erkut and M.A. Alpar,

Ap.J. 702, 1309 (2009).




Yayınlanmış Bildiriler:


1."Pulsar Glitches and Pinned Superfluidity "

 P.W. Anderson, M. Ali Alpar, D. Pines & J. Shaham,

 Proceedings of IAU Symposium No. 95,"Pulsars",

 R. Wielebinski & W. Siebert, eds.,(1980).

2."Superfluidity in Millisecond Pulsars" David Pines & M.Ali Alpar,

 Proc. of the Workshop on Millisecond Pulsars,

 S. Reynolds & D. Stinebring,eds., Greenbank, W.Virginia, USA (1984).

3."Gravitational Radiation from a Solid Crust Neutron Star"

 M.Ali Alpar & David Pines,

 Proc. of the Workshop on Millisecond Pulsars,

 S. Reynolds & D. Stinebring,eds., Greenbank, W.Virginia, USA (1984).

4."Internal Torques in Neutron Stars"

 M.Ali Alpar, Proc. of the Symposium on X-ray Astronomy,

 M. Oda & R. Giacconi,eds., Bologna,(1984).

5."Quasiperiodic Oscillations in Galactic Bulge Sources: Information

 on the Boundary Layer from Power Spectra"

 Proc. NATO ASI "High Energy Phenomena around Collapsed Stars",

 F.Pacini, ed., Reidel (1987).

6."Dynamics of the Neutron Star Interior " M.A.Alpar,

 Proc.13th Texas Symposium on Relativistic Astrophysics,

 M.Ulmer,ed.,WorldScientific (1987).

7."Inside Neutron Stars" M. Ali Alpar,

 Proc. NATO ASI "Timing Neutron Stars", H.Ogelman & E.P.J. van den Heuvel, eds., Kluwer (1989).

8."Vortex Creep Dynamics: Theory and Observations" M.Ali Alpar,

 Proc. NATO ASI "Timing Neutron Stars", H.Ogelman & E.P.J. van den Heuvel, eds.,

 Kluwer (1989).

9."Superfluid Dynamics in Neutron Stars" M.A. Alpar,

 Proc. NATO ASI "Neutron Stars: Theory and Observation",

 J.Ventura & D.Pines, eds., Kluwer (1991).


10."Inside Neutron Stars: a 1990 Perspective" D.Pines and M.Ali Alpar,

 Proc. US-Japan Seminar "The Structure and Evolution of Neutron Stars",

 D.Pines, R.Tamagaki and S.Tsuruta, eds., Addison-Wesley (1992).


11."Some Topics in Neutron Star Superfluid Dynamics" M.Ali Alpar,

 Proc. US-Japan Seminar "The Structure and Evolution of Neutron Stars",

 D.Pines, R.Tamagaki and S.Tsuruta, eds., Addison-Wesley (1992).

12."Pulsar Glitches and Neutron Star Superfluidity: a 1992 Perspective",

 M.A.Alpar and D.Pines,

 Proc. The Los Alamos Workshop "Isolated Pulsars",

 K.A.Van Riper, R.Epstein and C.Ho, eds., Cambridge University Press (1993).

13."Models for Pulsar Glitches", M.Ali Alpar,

 Proc. NATO ASI "Lives of the Neutron Stars",

 M.A.Alpar, U.Kiziloglu and J. van Paradijs, eds., Kluwer (1995).

14."The Distribution of Pulsars in the Galaxy",

 F.Gok,M.A.Alpar,O.H.Huseyinov and U.Kiziloglu,

 Proc. NATO ASI "Lives of the Neutron Stars",

 M.A.Alpar, U.Kiziloglu and J. van Paradijs, eds., Kluwer (1995).

15."Evolution of Pulsars in the P-Pdot Diagram",

 I.M.Yusifov, M.A.Alpar, F.Gok and O.H.Huseyinov,

 Proc. NATO ASI "Lives of the Neutron Stars",

 M.A.Alpar, U.Kiziloglu and J. van Paradijs, eds., Kluwer (1995).


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