B. Machenschalk
A5079711453- Pulsars and Gravitational Waves Research
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Geophysics and Gravity Measurements
- Radio Astronomy Observations and Technology
- Cold Atom Physics and Bose-Einstein Condensates
- High-pressure geophysics and materials
- Seismic Waves and Analysis
- Advanced Frequency and Time Standards
- Computational Physics and Python Applications
- Astronomical Observations and Instrumentation
Max Planck Institute for Gravitational Physics
2011-2022
Leibniz University Hannover
2013-2022
Max Planck Innovation
2011
Max Planck Society
2009-2011
We report here the Einstein@Home discovery of PSR J1913+1102, a 27.3-ms pulsar found in data from ongoing Arecibo PALFA survey. The is 4.95-hr double neutron star (DNS) system with an eccentricity 0.089. From radio timing 305-m telescope, we measure rate advance periastron to be 5.632(18) deg/yr. Assuming general relativity accurately models orbital motion, this corresponds total mass 2.875(14) solar masses, similar most massive DNS known date, B1913+16, but much smaller eccentricity. small...
We report on the results of a recent blind search survey for gamma-ray pulsars in Fermi Large Area Telescope (LAT) data being carried out distributed volunteer computing system, Einstein@Home. The has searched pulsations 118 unidentified pulsar-like sources, requiring about 10,000 years CPU core time. In total, this resulted discovery 17 new pulsars, which 13 are newly reported work, and an accompanying paper. These all young, isolated with characteristic ages between 12 kyr 2 Myr, spin-down...
The Fermi Large Area Telescope gamma-ray source 3FGL J2039.6$-$5618 contains a periodic optical and X-ray that was predicted to be "redback" millisecond pulsar (MSP) binary system. However, the conclusive identification required detection of pulsations from putative MSP. To better constrain orbital parameters for directed search pulsations, we obtained new light curves in 2017 2018, which revealed long-term variability companion star. resulting parameter constraints were used perform...
We conduct an all-sky search for continuous gravitational waves in the LIGO O2 data from Hanford and Livingston detectors. nearly-monochromatic signals with frequency between 20.0 Hz 585.15 spin-down -2.6e-9 Hz/s 2.6e-10 Hz/s. deploy on Einstein@Home volunteer-computing project follow-up waveforms associated most significant results eight further search-stages, reaching best sensitivity ever achieved by survey up to 500 Hz. Six of inspected pass all stages but they are hardware-injections,...
Einstein@Home aggregates the computer power of hundreds thousands volunteers from 193 countries, to search for new neutron stars using data electromagnetic and gravitational-wave detectors. This paper presents a detailed description radio pulsars Pulsar ALFA survey Arecibo Observatory. The enormous computing allows this cover region parameter space; it can detect in binary systems with orbital periods as short 11 minutes. We also describe first discovery, 40.8 Hz isolated pulsar PSR...
A citizen science project discovers a new type of gamma-ray millisecond pulsar with no detectable radio pulsations.
Einstein@Home, a distributed computing project, discovered rare, isolated pulsar with low magnetic field.
We report results of the most sensitive search to date for periodic gravitational waves from Cassiopeia A, Vela Jr., and G347.3 with frequency between 20 1500 Hz. The was made possible by computing power provided volunteers Einstein@Home project improves on previous a factor 2 across entire range all targets. find no significant signal candidate set stringent upper limits amplitude wave signals target population, corresponding sensitivity depths 54 $[1/\sqrt{\mathrm{Hz}}]$ 83...
We report the discovery and timing measurements of PSR J1208-6238, a young highly magnetized gamma-ray pulsar, with spin period 440 ms. The pulsar was discovered in photon data from Fermi Large Area Telescope (LAT) during blind-search survey unidentified LAT sources, running on distributed volunteer computing system Einstein@Home. No radio pulsations were detected dedicated follow-up searches Parkes telescope, flux density upper limit at 1369 MHz 30 $\mu$Jy. By this pulsar's pulsations, we...
We have conducted a new search for radio pulsars in compact binary systems the Parkes multi-beam pulsar survey (PMPS) data, employing novel methods to remove Doppler modulation from motion. This has yielded unparalleled sensitivity binaries. The required computation time of ≈17, 000 CPU core years was provided by distributed volunteer computing project Einstein@Home, which sustained power about 1 PFlop s−1. discovered 24 our search, 18 were isolated pulsars, and 6 members systems. Despite...
Abstract We report on the analysis of 13 gamma-ray pulsars discovered in Einstein@Home blind search survey using Fermi Large Area Telescope (LAT) Pass 8 data. The new were by searching 118 unassociated LAT sources from third source catalog (3FGL), selected Gaussian Mixture Model machine-learning algorithm basis their emission properties being suggestive pulsar magnetospheric emission. have pulse profiles and spectral similar to those previously detected young pulsars. Follow-up radio...
Abstract We present results of a search for periodic gravitational wave signals with frequencies between 20 and 400 Hz from the neutron star in supernova remnant G347.3-0.5 using LIGO O2 public data. The is deployed on volunteer computing project Einstein@Home, thousands participants donating compute cycles to make this endeavour possible. find no significant signal candidate set most constraining upper limits date amplitude target, corresponding deformations below 10 −6 large part band. At...
ABSTRACT We report on the discovery and timing observations of 29 distant long-period pulsars found in ongoing Arecibo L-band Feed Array pulsar survey. Following with Telescope, confirmation these over several years at Jodrell Bank Observatory have yielded high-precision positions measurements rotation radiation properties. used multi-frequency data to measure interstellar scattering properties some pulsars. Most that mirror those previously known population, although four show notable...
We report the discovery of 20.7 ms binary pulsar J1952+2630, made using distributed computing project Einstein@Home in Pulsar ALFA survey observations with Arecibo telescope. Follow-up telescope confirm nature system. obtain a circular orbital solution an period 9.4 hr, projected radius 2.8 lt-s, and mass function f = 0.15 solar masses by analysis spin measurements. No evidence eccentricity is apparent; we set 2-sigma upper limit e < 1.7e-3. The parameters suggest massive white dwarf...
We report the discovery of four gamma-ray pulsars, detected in computing-intensive blind searches data from Fermi Large Area Telescope (LAT). The pulsars were found using a novel search approach, combining volunteer distributed computing via Einstein@Home and methods originally developed gravitational-wave astronomy. PSRs J0554+3107, J1422−6138, J1522−5735, J1932+1916 are young energetic, with characteristic ages between 35 56 kyr spin-down powers range 6 × 1034—1036 erg s−1. They located...
We report the discovery of PSR J1906+0722, a gamma-ray pulsar detected as part blind survey unidentified Fermi Large Area Telescope (LAT) sources being carried out on volunteer distributed computing system, Einstein@Home. This newly discovered previously appeared most significant remaining source without known association in second Fermi-LAT catalog (2FGL) and was among top 10 unassociated recent third (3FGL). J1906+0722 is young, energetic, isolated pulsar, with spin frequency 8.9 Hz,...
We report the discovery of millisecond pulsar (MSP) PSR J1950+2414 ($P=4.3$ ms) in a binary system with an eccentric ($e=0.08$) 22-day orbit Pulsar ALFA survey observations Arecibo telescope. Its companion star has median mass 0.3 $M_\odot$ and is most likely white dwarf. Fully recycled MSPs like this one are thought to be old neutron stars spun-up by transfer from star. This process should circularize orbit, as observed for vast majority MSPs, which predominantly have orbital eccentricities...
In this paper we design a search for continuous gravitational waves from three supernova remnants: Vela Jr., Cassiopeia A (Cas A) and G347.3. These systems might harbor rapidly rotating neutron stars emitting quasiperiodic radiation detectable by the advanced LIGO detectors. Our is designed to use volunteer computing project Einstein@Home few months assumes sensitivity duty cycles of detectors during their first science run. For all remnants, sky positions central compact objects are well...
Abstract We report the discovery of 1.97 ms period gamma-ray pulsations from 75 minute orbital-period binary pulsar now named PSR J1653−0158. The associated Fermi Large Area Telescope source 4FGL J1653.6−0158 has long been expected to harbor a millisecond pulsar. Despite pulsar-like spectrum and candidate optical/X-ray associations—whose periodic brightness modulations suggested an orbit—no radio had found in many searches. was discovered by directly searching data using GPU-accelerated...