scholarly journals Searches for Young Pulsars

2004 ◽  
Vol 218 ◽  
pp. 97-104 ◽  
Author(s):  
Fernando Camilo
Keyword(s):  
Neutron Stars ◽  
Compact Objects ◽  
Pulsar Wind Nebulae ◽  
X Ray ◽  
Γ Ray ◽  
Pulsar Wind ◽  
Central Compact Objects

I review the results of radio and X-ray searches for pulsations from young neutron stars, emphasizing work accomplished in the last five years. I cover undirected searches, as well as directed searches of pulsar wind nebulae, EGRET γ-ray sources, and also the search for pulsations from “isolated neutron stars” and “central compact objects”.

scholarly journals Central compact objects and their magnetic fields

2012 ◽  
Vol 8 (S291) ◽  
pp. 101-106 ◽  
Author(s):  
Wynn C. G. Ho
Keyword(s):  
Magnetic Fields ◽  
Neutron Stars ◽  
Supernova Remnants ◽  
Compact Objects ◽  
Spectral Measurements ◽  
X Ray ◽  
Surface Field ◽  
Weak Surface ◽  
Central Compact Objects ◽  
Weak Fields

AbstractCentral compact objects (CCOs) are neutron stars that are found near the center of supernova remnants, and their association with supernova remnants indicates these neutron stars are young (≲ 104 yr). Here we review the observational properties of CCOs and discuss implications, especially their inferred magnetic fields. X-ray timing and spectral measurements suggest CCOs have relatively weak surface magnetic fields (~ 1010 − 1011 G). We argue that, rather than being created with intrinsically weak fields, CCOs are born with strong fields and we are only seeing a weak surface field that is transitory and evolving. This could imply that CCOs are one manifestation in a unified picture of neutron stars.

scholarly journals Pulsar Wind Nebulae and the X‐Ray Emission of Nonaccreting Neutron Stars

2004 ◽  
Vol 617 (1) ◽  
pp. 480-489 ◽  
Author(s):  
K. S. Cheng ◽  
Ronald E. Taam ◽  
W. Wang
Keyword(s):  
Neutron Stars ◽  
Pulsar Wind Nebulae ◽  
X Ray ◽  
Pulsar Wind

scholarly journals Central Compact Objects in Supernova Remnants

2004 ◽  
Vol 218 ◽  
pp. 239-246 ◽  
Author(s):  
George G. Pavlov ◽  
Divas Sanwal ◽  
Marcus A. Teter
Keyword(s):  
Neutron Stars ◽  
Supernova Remnants ◽  
Compact Objects ◽  
X Ray ◽  
Central Regions ◽  
Supernova Explosions ◽  
Central Compact Objects

There are point-like sources in central regions of several supernova remnants which have not been detected outside the X-ray range. The X-ray spectra of these Central Compact Objects (CCOs) have thermal components with blackbody temperatures of 0.2–0.5 keV and characteristic sizes of 0.3-3 km. Most likely, the CCOs are neutron stars born in supernova explosions. We overview their observational properties, emphasizing the Chandra data, and compare them with magnetars.

scholarly journals Searching for X-ray Pulsations from Neutron Stars Using NICER

2017 ◽  
Vol 13 (S337) ◽  
pp. 187-190 ◽  
Author(s):  
Paul S. Ray ◽  
Zaven Arzoumanian ◽  
Keith C. Gendreau ◽  
Keyword(s):  
Neutron Star ◽  
Neutron Stars ◽  
Compact Objects ◽  
Large Area ◽  
Pulse Profile ◽  
Millisecond Pulsars ◽  
X Ray ◽  
Event Time ◽  
Time Stamps ◽  
Central Compact Objects

AbstractThe Neutron Star Interior Composition Explorer (NICER) presents an exciting new capability for exploring the modulation properties of X-ray emitting neutron stars, including large area, low background, extremely precise absolute event time stamps, superb low-energy response and flexible scheduling. The Pulsation Searches and Multiwavelength Coordination working group has designed a 2.5 Ms observing program to search for emission and characterize the modulation properties of about 30 known or suspected neutron star sources across a number of source categories. A key early goal will be to search for pulsations from millisecond pulsars that might exhibit thermal pulsations from the surface suitable for pulse profile modeling to constrain the neutron star equation of state. In addition, we will search for pulsations from transitional millisecond pulsars, isolated neutron stars, low-mass X-ray binaries (LMXBs), accretion-powered millisecond pulsars, central compact objects and other sources. We present our science plan and initial results from the first months of the NICER mission, including the discovery of pulsations from the millisecond pulsar J1231–1411.

scholarly journals Imprints of Neutron Stars in the Interstellar Medium

2004 ◽  
Vol 218 ◽  
pp. 277-278 ◽  
Author(s):  
Estela M. Reynoso ◽  
Simon Johnston ◽  
Anne J. Green ◽  
W. M. Goss ◽  
Gloria M. Dubner ◽  
...  
Keyword(s):  
Interstellar Medium ◽  
Neutron Stars ◽  
Supernova Remnants ◽  
Compact Objects ◽  
X Ray ◽  
Central Compact Objects

We have carried out an H I survey towards X-ray central compact objects (CCOs) inside supernova remnants (SNRs), which shows that many of them are placed within local H I minimA. The nature of these minima is not clear, but the most likely explanation is that the CCOs have evacuated the neighboring gas. This survey also allowed us to detect a weak, diffuse radio nebula inside the SNR G266.2−1.2, probably created by the winds of its associated CCO.

scholarly journals X-RAY INVESTIGATION OF THE DIFFUSE EMISSION AROUND PLAUSIBLE γ-RAY EMITTING PULSAR WIND NEBULAE IN KOOKABURRA REGION

2012 ◽  
Vol 750 (2) ◽  
pp. 162 ◽  
Author(s):  
Tetsuichi Kishishita ◽  
Aya Bamba ◽  
Yasunobu Uchiyama ◽  
Yasuyuki Tanaka ◽  
Tadayuki Takahashi
Keyword(s):  
Diffuse Emission ◽  
Pulsar Wind Nebulae ◽  
X Ray ◽  
Γ Ray ◽  
Pulsar Wind

scholarly journals A high-energy catalogue of Galactic supernova remnants and pulsar wind nebulae

2012 ◽  
Vol 8 (S291) ◽  
pp. 483-485 ◽  
Author(s):  
Samar Safi-Harb ◽  
Gilles Ferrand ◽  
Heather Matheson
Keyword(s):  
Neutron Stars ◽  
Supernova Remnants ◽  
Gamma Ray ◽  
High Energy ◽  
Public Database ◽  
Pulsar Wind Nebulae ◽  
X Ray ◽  
Global View ◽  
Pulsar Wind ◽  
New Instruments

AbstractMotivated by the wealth of past, existing, and upcoming X-ray and gamma-ray missions, we have developed the first public database of high-energy observations of all known Galactic Supernova Remnants (SNRs): http://www.physics.umanitoba.ca/snr/SNRcat. The catalogue links to, and complements, other existing related catalogues, including Dave Green's radio SNRs catalogue. We here highlight the features of the high-energy catalogue, including allowing users to filter or sort data for various purposes. The catalogue is currently targeted to Galactic SNR observations with X-ray and gamma-ray missions, and is timely with the upcoming launch of X-ray missions (including Astro-H in 2014). We are currently developing the existing database to include an up-to-date Pulsar Wind Nebulae (PWNe)-dedicated webpage, with the goal to provide a global view of PWNe and their associated neutron stars/pulsars. This extensive database will be useful to both theorists to apply their models or design numerical simulations, and to observers to plan future observations or design new instruments. We welcome input and feedback from the SNR/PWN/neutron stars community.

DEPENDENCE OF THE X-RAY LUMINOSITY AND PULSAR WIND NEBULA ON DIFFERENT PARAMETERS OF PULSARS AND THE EVOLUTIONARY EFFECTS

2004 ◽  
Vol 13 (02) ◽  
pp. 197-213 ◽  
Author(s):  
OKTAY H. GUSEINOV ◽  
AŞKIN ANKAY ◽  
SEVINÇ O. TAGIEVA ◽  
M. ÖZGÜR TAŞKIN
Keyword(s):  
Magnetic Field ◽  
Neutron Stars ◽  
Characteristic Time ◽  
Rotational Energy ◽  
X Ray ◽  
Γ Ray ◽  
Pulsar Wind ◽  
Low X ◽  
The Magnetic Field ◽  
Relativistic Particles

Dependences of the X-ray luminosity (Lx) of young single pulsars, due to ejection of relativistic particles, on electric field intensity, rate of rotational energy loss (Ė), magnetic field, period, and some other parameters of neutron stars are discussed. Influence of the magnetic field and effects of some other parameters of neutron stars on the Lx-Ė and the Lx-τ (characteristic time) dependences are considered. Evolutionary factors also play an important role in our considerations. Only the pulsars with L2–10 keV >1033 erg/s have pulsar wind nebula around them. The pulsars from which γ-ray radiation has been observed have low X-ray luminosity in general.

scholarly journals Pulsar Wind Nebulae: On their growing diversity and association with highly magnetized neutron stars

2012 ◽  
Vol 8 (S291) ◽  
pp. 251-256 ◽  
Author(s):  
Samar Safi-Harb
Keyword(s):  
Neutron Stars ◽  
Supernova Remnants ◽  
High Energy ◽  
Current Status ◽  
Pulsar Wind Nebulae ◽  
X Ray ◽  
The Past ◽  
Pulsar Wind

AbstractThe 1968 discovery of the Crab and Vela pulsars in their respective supernova remnants (SNRs) confirmed Baade and Zwicky's 1934 prediction that supernovae form neutron stars. Observations of Pulsar Wind Nebulae (PWNe), particularly with the Chandra X-ray Observatory, have in the past decade opened a new window to focus on the neutron stars' relativistic winds, study their interaction with their hosting SNRs, and find previously missed pulsars. While the Crab has been thought for decades to represent the prototype of PWNe, we now know of different classes of neutron stars and PWNe whose properties differ from the Crab. In this talk, I review the current status of neutron stars/PWNe-SNRs associations, and highlight the growing diversity of PWNe with an X-ray eye on their association with highly magnetized neutron stars. I conclude with an outlook to future high-energy studies.

scholarly journals The γ-ray Pulsar J0633+0632 in X-rays

2015 ◽  
Vol 32 ◽  
Author(s):  
Andrey Danilenko ◽  
Peter Shternin ◽  
Anna Karpova ◽  
Dima Zyuzin ◽  
Yuriy Shibanov
Keyword(s):  
Neutron Stars ◽  
Proper Motion ◽  
Absorption Feature ◽  
X Rays ◽  
Active Star ◽  
X Ray ◽  
Star Forming ◽  
Rosette Nebula ◽  
Γ Ray ◽  
Pulsar Wind

AbstractWe analysedChandraobservations of the brightFermipulsar J0633+0632 and found evidence of an absorption feature in its spectrum at 804+42−26eV (the errors are at 90% confidence) with equivalent width of 63+47−36eV. In addition, we analysed in detail the X-ray spectral continuum taking into account correlations between the interstellar absorption and the distance to the source. We confirm early findings that the spectrum contains non-thermal and thermal components. The latter is equally well described by the blackbody and magnetised atmosphere models and can be attributed to the emission from the bulk of the stellar surface in both cases. The distance to the pulsar is constrained in a range of 1–4 kpc from the spectral fits. We infer the blackbody surface temperature of 108+22−14eV, while for the atmosphere model, the temperature, as seen by a distant observer, is 53+12−7eV. In the latter case, J0633+0632 is one of the coldest middle-aged isolated neutron stars. Finally, it powers an extended pulsar wind nebula whose shape suggests a high pulsar proper motion. Looking backwards the direction of the presumed proper motion, we found a likely birthplace of the pulsar—the Rosette nebula, a 50-Myr-old active star-forming region located at about 1.5° from the pulsar. If true, this constrains the distance to the pulsar in the range of 1.2–1.8 kpc.

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