The Philosopher
Hakkı Ögelman
The face
The background
- Nationality:
- Turkish
- Schools:
- Astrophysics
- Branchs:
- Gamma-ray astronomy, Neutron star physics, Solar physics, High energy astrophysics, Solar energy, Compact objects, X-ray astronomy
- Period:
- 20th century
The synopsis
Hakkı Boran Ögelman (July 8, 1940 – September 4, 2011) was a Turkish physicist and astrophysicist. He was an expert on gamma-ray astronomy, the physics of neutron stars, and solar energy and worked on several key topics in modern astrophysics. He made many contributions to high energy astrophysics. In his early professional career he engaged in the SAS-II Small Gamma Ray Astronomy Satellite experiment development, data analysis, and first detection and imaging of our universe in gamma rays with his NASA colleagues, as well as in other fields of physics. His main interests in the field of astrophysics were the study of gamma ray astronomy and compact objects such as neutron stars and pulsars. Ögelman worked at NASA's Goddard Space Flight Center, Middle East Technical University (METU) in Ankara, Turkey, Çukurova University in Adana, Turkey, Max Planck Institute (MPI) at Garching, Germany and the University of Wisconsin. He was born in Ankara, Turkey, and pursued his higher education in the United States, earning degrees from DePauw University and Cornell University. After postdoctoral research in Australia and work at Goddard Space Flight Center, he returned to Turkey to contribute to education and research at METU and later at Çukurova University. He also held positions at the Max Planck Institute and the University of Wisconsin. His research interests included gamma-ray astronomy, neutron stars, pulsars, and solar energy. He received several awards and honors for his contributions to science. He passed away in 2011, and a summer school program was established in his memory.
The works
Gamma-rays from pulsars
ROSAT observation of the old classical nova CP Puppis
An empirical torque noise and spin-up model for accretion-powered x-ray pulsars
High-energy galactic gamma-radiation from Sas-2 satellite
SAS-2 Observations of the diffuse gamma-radiation in the galactic latitude interval 10-degrees less than (B) less than or equal to 90-degrees
The PSR 1800-21/G8.7-0.1 association - a view from ROSAT
Galactic plane gamma-radiation
Investigation of sodium in the upper atmosphere
Gamma radiation from PSR B1055-52
X-ray emission of nova Puppis 1991: accretion or a shocked shell?
ROSAT observations of the Vela pulsar
Chandra observations of two pulsars PSR 0628-28 and PSR 1813-36
Soft x-ray observations of the VELA pulsar PSR 0833-45
Discovery of extended emission around the pulsar B0355+54
Is Geminga A Glitching Pulsar
The search for muon neutrinos from northern hemisphere gamma-ray bursts with AMANDA
Limits to the muon flux from neutralino annihilations in the sun with the AMANDA detector
Status of the IceCube neutrino observatory - 2nd VERITAS symposium on the astrophysics of extragalactic sources, April 24-26, 2003
Ultra-short light pulses from pulsars
Discrete source interpretation of recent high energy cosmic gamma ray measurements
Extensive air shower arrays as detectors of prompt gamma rays from supernovae explosions
Millisecond time scale atmospheric light pulses associated with solar and magnetospheric activity
Neutron stars with main-sequence binary companions as low luminosity x-ray sources
High-energy gamma-ray results from second small astronomy satellite
Gamma radiation from the Crab Nebula above 35 MeV
Observations of low-energy gamma-ray bursts with Sas-2
Pulsar periods and rapid changes in terrestrial rotation rate
EXOSAT observations of the 35 day cycle of Hercules X-1 - evidence for neutron-star precession
Soft x-ray observations of the radio pulsar PSR-1055-52
Two neutrino periodicities from supernova 1987A
An x-ray jet from the Vela pulsar
Pulsed x-rays from the Vela pulsar
Detection of supersoft x-ray emission from GQ-Muscae nine years after a nova outburst
ROSAT X-Ray Observations of Nova V1974 Cygni: the rise and fall of the brightest supersoft x-ray source
Ultraviolet observations of AR-Lacertae
ROSAT observations of single pulsars
Post-glitch RXTE-PCA observations of the Vela pulsar
Preliminary test results of pixel detectors developed for the All-sky X-ray and Gamma-ray Astronomy Monitor (AXGAM)