scholarly journals Pevatron at the Galactic Center: multi-wavelength signatures from millisecond pulsars

2018 ◽  
Vol 2018 (07) ◽  
pp. 042-042 ◽  
Author(s):  
Claire Guépin ◽  
Lucia Rinchiuso ◽  
Kumiko Kotera ◽  
Emmanuel Moulin ◽  
Tanguy Pierog ◽  
...  
Keyword(s):  
Galactic Center ◽  
Millisecond Pulsars ◽  
Multi Wavelength

Resolved Millisecond Pulsars are Consistent with the Galactic Center Excess (Invited Talk)

2018 ◽  
Author(s):  
Chris Gordon ◽  
Harrison Ploeg ◽  
Roland Crocker ◽  
Oscar Macias
Keyword(s):  
Galactic Center ◽  
Millisecond Pulsars

scholarly journals Pulsar Searches at Effelsberg

2004 ◽  
Vol 218 ◽  
pp. 133-134 ◽  
Author(s):  
B. Klein ◽  
M. Kramer ◽  
P. Müller ◽  
R. Wielebinski
Keyword(s):  
Radio Telescope ◽  
Galactic Center ◽  
Millisecond Pulsars ◽  
Highly Dispersed ◽  
L Band ◽  
Under Construction ◽  
5 Ghz ◽  
Key Aspects ◽  
Pulsar Searches

We report on the progress of our search for highly dispersed pulsars near the Galactic Center at 5 GHz using the 100-m radio telescope in Effelsberg. We also present key aspects of our new survey for millisecond pulsars at 21 cm in parts of the northern sky. This survey will greatly benefit from the L-band multibeam receiver and a new FFT-based backend which are currently under construction at the MPIfR.

scholarly journals Theory of G2 cloud multi-wavelength emission

2013 ◽  
Vol 9 (S303) ◽  
pp. 303-306 ◽  
Author(s):  
R. V. Shcherbakov
Keyword(s):  
Black Hole ◽  
Galactic Center ◽  
Thermal Emission ◽  
Supermassive Black Hole ◽  
Multi Wavelength ◽  
New Ideas ◽  
Wavelength Emission ◽  
Ir Diagnostics

AbstractAn object called G2 was recently discovered moving towards the supermassive black hole in the Galactic center. G2 emits infrared (IR) lines and continuum, which allows constraining its properties. The question is still unresolved whether G2 has a central windy star or it is a coreless cloud. Assuming the object is a cloud originating near the apocenter I perform line/continuum IR diagnostics, revisit estimates of non-thermal emission from pericenter passage, and speculate about future observational prospects. This work is partially reported in Shcherbakov (2013) and partially consists of new ideas discussed at the conference.

scholarly journals A decade of transitional millisecond pulsars

2017 ◽  
Vol 13 (S337) ◽  
pp. 47-51 ◽  
Author(s):  
Amruta Jaodand ◽  
Jason W. T. Hessels ◽  
Anne Archibald
Keyword(s):  
Neutron Stars ◽  
Millisecond Pulsar ◽  
Physical Processes ◽  
Recycling Process ◽  
Millisecond Pulsars ◽  
X Ray ◽  
System A ◽  
Multi Wavelength ◽  
Low Mass

AbstractTransitional millisecond pulsars (tMSPs), which are systems that harbor a pulsar in the throes of the recycling process, have emerged as a new source class since the discovery of the first such system a decade ago. These systems switch between accretion-powered low-mass X-ray binary (LMXB) and rotation-powered radio millisecond pulsar (RMSP) states, and provide exciting avenues to understand the physical processes that spin-up neutron stars to millisecond periods. During the last decade, three tMSPs, as well as a candidate source, have been extensively probed using systematic, multi-wavelength campaigns. Here we review the observational highlights from these campaigns and our general understanding of tMSPs.

scholarly journals Annular gap model for multi-wavelength pulsed emission from young and millisecond pulsars

2012 ◽  
Vol 8 (S291) ◽  
pp. 378-380
Author(s):  
Yuan Jie Du ◽  
Guo Jun Qiao
Keyword(s):  
Inclination Angle ◽  
Pole Model ◽  
Viewing Angle ◽  
Gap Model ◽  
Magnetic Pole ◽  
Millisecond Pulsars ◽  
Annular Gap ◽  
Magnetic Inclination ◽  
Multi Wavelength

AbstractThe multi-wavelength pulsed emission from young pulsars and millisecond pulsars can be well modeled with the single-pole 3-dimension annular gap and core gap model. To distinguish our single magnetic pole model from two-pole models (e.g. outer gap model and two-pole caustic model), the convincing values of the magnetic inclination angle and the viewing angle will play a key role.

scholarly journals ON DETECTING MILLISECOND PULSARS AT THE GALACTIC CENTER

2015 ◽  
Vol 805 (2) ◽  
pp. 172 ◽  
Author(s):  
Jean-Pierre Macquart ◽  
Nissim Kanekar
Keyword(s):  
Galactic Center ◽  
Millisecond Pulsars

scholarly journals Searching for Gamma-Ray Millisecond Pulsars: Selection of Candidates Revisited

Galaxies ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 31
Author(s):  
Xuejie Dai ◽  
Zhongxiang Wang ◽  
Jithesh Vadakkumthani
Keyword(s):  
Point Source ◽  
Gamma Ray ◽  
Previous Analysis ◽  
Test Statistic ◽  
Large Area ◽  
Millisecond Pulsars ◽  
Multi Wavelength ◽  
Γ Ray ◽  
Available Information ◽  
Selection Of

We are starting a project to find γ -ray millisecond pulsars (MSPs) among the unidentified sources detected by the Large Area Telescope (LAT) onboard the Fermi Gamma-Ray Space Telescope (Fermi), by radio observations. The selection of good candidates from analysis of the LAT data is an important part of the project. Given that there is more than 10 years worth of LAT data and the advent of the newly released LAT 8-year point source list (FL8Y), we have conducted a selection analysis, on the basis of our previous analysis, and report the results here. Setting the requirements for the unidentified sources in FL8Y of Galactic latitudes | b | > 5 ∘ and curvature significances >3 σ , there are 202 sources with detection signficances >6 σ . We select 57 relatively bright ones (detection significances >15 σ ) and analyze their 10.2 years of LAT data. Their variability is checked to exclude variable sources (likely blazars), test statistic maps are constructed to avoid contaminated sources, and curvature significances are re-obtained and compared to their γ -ray spectra to exclude non-significant sources. In the end, 48 candidates are found. Based on the available information, mostly from multi-wavelength studies, we discuss the possible nature of several of the candidates. Most of these candidates are currently being observed with the 65-meter Shanghai Tian Ma Radio Telescope.

scholarly journals The Fingerprint of a Galactic Nucleus

2016 ◽  
Vol 11 (S322) ◽  
pp. 257-258
Author(s):  
Francisco Nogueras-Lara ◽  
Rainer Schödel
Keyword(s):  
Large Scale ◽  
Near Infrared ◽  
Angular Resolution ◽  
Galactic Center ◽  
Fold Increase ◽  
Galactic Centre ◽  
High Angular Resolution ◽  
Imaging Data ◽  
First Results ◽  
Multi Wavelength

AbstractBecause of the unique observational challenges -extreme crowding and extinction- any existing large-scale near-infrared (NIR) imaging data on the Galactic Center (GC) are limited by either one, or a combination, of the following: saturation, lack of sensitivity, too low angular resolution, or lack of multi-wavelength coverage. To overcome this situation, we are currently carrying out a sensitive, 0.2” resolution JHK imaging survey of the Galactic Centre with HAWK-I/VLT. Thanks to holographic imaging, we achieve a similar resolution than with HST/WFC, but can cover also the long NIR, beyond 2 micrometers, which is essential to deal with extinction. Our survey is supported by an ESO Large Programme and will provide photometrically accurate (few percent uncertainty for H < 18 stars), high-angular resolution, NIR data for an area of several 1000 pc2, a more than ten-fold increase compared to the current state of affairs. Here we present an overview and first results.

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