76 citations · 275 across the 12 of their papers we have counts for
12 papers
Discovery of extended infrared emission around the neutron star RX J0806.4-4123
B. Posselt, G. G. Pavlov, Ü. Ertan +3
Following up on a faint detection of a near-infrared (NIR) source at the position of the X-ray thermal isolated neutron star RX J0806.4-4123, we present new Hubble Space Telescope…
Optical excess of dim isolated neutron stars
Unal Ertan, Sirin Caliskan, M. Ali Alpar
The optical excess in the spectra of dim isolated neutron stars (XDINs) is a significant fraction of their rotational energy loss-rate. This is strikingly different from the situat…
Long-term evolution, X-ray outburst and optical/infrared emission of SGR 0501+4516
O. Benli, S. Caliskan, U. Ertan
We have analyzed the long-term evolution and the X-ray outburst light curve of SGR 0501+4516 in the frame of the fallback disc model. We have shown that the X-ray luminosity, perio…
Long-term evolution of dim isolated neutron stars
U. Ertan, S. Caliskan, O. Benli +1
The dim isolated neutron stars (XDINs) have periods in the same range as the anomalous X-ray pulsars (AXPs) and the soft gamma-ray repeaters (SGRs). We apply the fallback disk mode…
X-ray Enhancement And Long-term Evolution Of Swift J1822.3-1606
Onur Benli, S. Caliskan, U. Ertan +3
We investigate the X-ray enhancement and the long-term evolution of the recently discovered, second "low-B magnetar" Swift J1822.3-1606 in the frame of the fallback disk model. Dur…
Fallback Disks, Magnetars and Other Neutron Stars
M. Ali Alpar, S. Caliskan, U. Ertan
The presence of matter with angular momentum, in the form of a fallback disk around a young isolated neutron star will determine its evolution. This leads to an understanding of ma…
On The Evolution of The Radio Pulsar PSR J1734-3333
S. Caliskan, U. Ertan, M. A. Alpar +2
Recent measurements showed that the period derivative of the 'high-B' radio pulsar PSR J1734-3333 is increasing with time. For neutron stars evolving with fallback disks, this rota…
On the X-ray Outbursts of Transient Anomalous X-ray Pulsars and Soft Gamma-ray Repeaters
Sirin Caliskan, Unal Ertan
We show that the X-ray outburst light curves of four transient anomalous X-ray pulsars (AXPs) and soft gamma-ray repeaters (SGRs), namely XTE J1810-197, SGR 0501+4516, SGR 1627-41…
The puzzling assembly of the Milky Way halo - contributions from dwarf Spheroidals and globular clusters
Andreas Koch, Sebastien Lépine, Seyma Çalışkan
While recent sky surveys have uncovered large numbers of ever fainter Milky Way satellites, their classification as star clusters, low-luminosity galaxies, or tidal overdensities r…
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?
M. A. Alpar, U. Ertan, S. Caliskan
The period derivative bound for SGR 0418+5729 (Rea et al. 2010) establishes the magnetic dipole moment to be distinctly lower than the magnetar range, placing the source beyond the…
Anomalous X-ray pulsars: Persistent States with Fallback Disks
Unal Ertan, M. Ali Alpar, M. Hakan Erkut +2
The anomalous X-ray pulsar 4U 0142+61 was recently detected in the mid infrared bands with the SPITZER Observatory (Wang, Chakrabarty & Kaplan 2006). This observation is the first…
Optical and Infrared Emission from the AXPs and SGRs
Unal Ertan, Sirin Caliskan
We show that the irradiated accretion disk model can account for all the optical and infrared observations of the anomalous X-ray pulsars in the persistent state. Model fits do not…