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71. Observation of first Fermi-LAT sources at Parkes
ID:
ivo://CDS.VizieR/J/ApJ/810/85
Title:
Observation of first Fermi-LAT sources at Parkes
Short Name:
J/ApJ/810/85
Date:
21 Oct 2021
Publisher:
CDS
Description:
In a search with the Parkes radio telescope of 56 unidentified Fermi-Large Area Telescope (LAT) gamma-ray sources, we have detected 11 millisecond pulsars (MSPs), 10 of them discoveries, of which five were reported by Kerr et al (2012ApJ...748L...2K). We did not detect radio pulsations from six other pulsars now known in these sources. We describe the completed survey, which included multiple observations of many targets conducted to minimize the impact of interstellar scintillation, acceleration effects in binary systems, and eclipses. We consider that 23 of the 39 remaining sources may still be viable pulsar candidates. We present timing solutions and polarimetry for five of the MSPs and gamma-ray pulsations for PSR J1903-7051 (pulsations for five others were reported in the second Fermi-LAT catalog of gamma-ray pulsars). Two of the new MSPs are isolated and five are in >1 day circular orbits with 0.2-0.3 M_{sun}_ presumed white dwarf companions. PSR J0955-6150, in a 24 day orbit with a 0.2-0.3 M_{sun}_ companion but eccentricity of 0.11, belongs to a recently identified class of eccentric MSPs. PSR J1036-8317 is in an 8 hr binary with a>0.14 M_{sun}_ companion that is probably a white dwarf. PSR J1946-5403 is in a 3 hr orbit with a>0.02 M_{sun}_ companion with no evidence of radio eclipses.
72. Obs. of 2 Unidentified Gamma-ray Sources
ID:
ivo://CDS.VizieR/J/A+A/458/245
Title:
Obs. of 2 Unidentified Gamma-ray Sources
Short Name:
J/A+A/458/245
Date:
21 Oct 2021
Publisher:
CDS
Description:
The systematic X-ray and optical coverage of low-latitude unidentified gamma-ray sources, aiming at sources with high X-ray/optical flux ratio, seems one of the most promising ways to spot INS candidate counterparts. We have focussed on two middle-latitude, probably galactic, EGRET sources: 3EG J0616-3310 and 3EG J1249-8330. Here we report on X-ray observations of the two gamma-ray error boxes performed with XMM-Newton and on their optical follow-up carried on with the Wide Field Imager at the ESO/MPG 2.2m telescope. Less than half of the ~300 sources detected by the X-ray coverage have no optical counterparts. Among those, we have selected few interesting sources with f_X_/f_opt_>100, which we consider promising INS candidates.
73. Optical photometry of 4 millisecond pulsars
ID:
ivo://CDS.VizieR/J/ApJ/769/108
Title:
Optical photometry of 4 millisecond pulsars
Short Name:
J/ApJ/769/108
Date:
21 Oct 2021
Publisher:
CDS
Description:
In the last few years, over 43 millisecond radio pulsars have been discovered by targeted searches of unidentified {gamma}-ray sources found by the Fermi Gamma-Ray Space Telescope. A large fraction of these millisecond pulsars are in compact binaries with low-mass companions. These systems often show eclipses of the pulsar signal and are commonly known as black widows and redbacks because the pulsar is gradually destroying its companion. In this paper, we report on the optical discovery of four strongly irradiated millisecond pulsar companions. All four sources show modulations of their color and luminosity at the known orbital periods from radio timing. Light curve modeling of our exploratory data shows that the equilibrium temperature reached on the companion's dayside with respect to their nightside is consistent with about 10%-30% of the available spin-down energy from the pulsar being reprocessed to increase the companion's dayside temperature. This value compares well with the range observed in other irradiated pulsar binaries and offers insights about the energetics of the pulsar wind and the production of {gamma}-ray emission. In addition, this provides a simple way of estimating the brightness of irradiated pulsar companions given the pulsar spin-down luminosity. Our analysis also suggests that two of the four new irradiated pulsar companions are only partially filling their Roche lobe. Some of these sources are relatively bright and represent good targets for spectroscopic follow-up.
74. Opt. spectroscopy of redback ms pulsar binaries
ID:
ivo://CDS.VizieR/J/ApJ/872/42
Title:
Opt. spectroscopy of redback ms pulsar binaries
Short Name:
J/ApJ/872/42
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the first optical spectroscopy of five confirmed (or strong candidate) redback millisecond pulsar binaries, obtaining complete radial velocity curves for each companion star. The properties of these millisecond pulsar binaries with low-mass, hydrogen-rich companions are discussed in the context of the 14 confirmed and 10 candidate field redbacks. We find that the neutron stars in redbacks have a median mass of 1.78+/-0.09M_{sun}_ with a dispersion of {sigma}=0.21+/-0.09. Neutron stars with masses in excess of 2M_{sun}_ are consistent with, but not firmly demanded by, current observations. Redback companions have median masses of 0.36+/-0.04M_{sun}_ with a scatter of {sigma}=0.15+/-0.04M_{sun}_, and a tail possibly extending up to 0.7-0.9M_{sun}_. Candidate redbacks tend to have higher companion masses than confirmed redbacks, suggesting a possible selection bias against the detection of radio pulsations in these more massive candidate systems. The distribution of companion masses between redbacks and the less massive black widows continues to be strongly bimodal, which is an important constraint on evolutionary models for these systems. Among redbacks, the median efficiency of converting the pulsar spin-down energy to {gamma}-ray luminosity is ~10%.
75. Parkes Multi-Beam Pulsar Survey
ID:
ivo://CDS.VizieR/J/MNRAS/328/17
Title:
Parkes Multi-Beam Pulsar Survey
Short Name:
J/MNRAS/328/17
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Parkes multi-beam pulsar survey is a sensitive survey of a strip along the Galactic plane with |b|<5{deg} and l=260{deg} to l=50{deg}. It uses a 13-beam receiver on the 64-m Parkes radio telescope, receiving two polarizations per beam over a 288-MHz bandwidth centred on 1374MHz. The receiver and data acquisition systems are described in some detail. For pulsar periods in the range 0.1-2s and dispersion measures of less than 300cm^-3^pc, the nominal limiting flux density of the survey is about 0.2mJy. At shorter or longer periods or higher dispersions, the sensitivity is reduced. Timing observations are carried out for pulsars discovered in the survey for 12-18 months after confirmation to obtain accurate positions, spin parameters, dispersion measures, pulse shapes and mean flux densities. The survey is proving to be extremely successful, with more than 600 pulsars discovered so far. We expect that, when complete, this one survey will come close to finding as many pulsars as all previous pulsar surveys put together. The newly discovered pulsars tend to be young, distant and of high radio luminosity. They will form a valuable sample for studies of pulsar emission properties, the Galactic distribution and evolution of pulsars, and as probes of interstellar medium properties. This paper reports the timing and pulse shape parameters for the first 100 pulsars timed at Parkes, including three pulsars with periods of less than 100ms which are members of binary systems. These results are briefly compared with the parameters of the previously known population.
76. Parkes Multi-Beam Pulsar Survey. III.
ID:
ivo://CDS.VizieR/J/MNRAS/342/1299
Title:
Parkes Multi-Beam Pulsar Survey. III.
Short Name:
J/MNRAS/342/1299
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Parkes Multibeam Pulsar Survey has unlocked vast areas of the Galactic plane, which were previously invisible to earlier low-frequency and less-sensitive surveys. The survey has discovered more than 600 new pulsars so far, including many that are young and exotic. In this paper we report the discovery of 200 pulsars for which we present positional and spin-down parameters, dispersion measures, flux densities and pulse profiles. A large number of these new pulsars are young and energetic, and we review possible associations of {gamma}-ray sources with the sample of about 1300 pulsars for which timing solutions are known. Based on a statistical analysis, we estimate that about 19+/-6 associations are genuine. The survey has also discovered 12 pulsars with spin properties similar to those of the Vela pulsar, nearly doubling the known population of such neutron stars. Studying the properties of all known 'Vela-like' pulsars, we find their radio luminosities to be similar to normal pulsars, implying that they are very inefficient radio sources. Finally, we review the use of the newly discovered pulsars as Galactic probes and discuss the implications of the new NE2001 Galactic electron density model for the determination of pulsar distances and luminosities.
77. Parkes Multi-Beam Pulsar Survey. IV.
ID:
ivo://CDS.VizieR/J/MNRAS/352/1439
Title:
Parkes Multi-Beam Pulsar Survey. IV.
Short Name:
J/MNRAS/352/1439
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Parkes multibeam pulsar survey has led to the discovery of more than 700 pulsars. In this paper, we provide timing solutions, flux densities and pulse profiles for 180 of these new discoveries. Two pulsars, PSRs J17362843 and J18470130, have rotational periods P>6s and are therefore among the slowest rotating radio pulsars known. Conversely, with P=1.8ms, PSR J18431113 has the third-shortest period of pulsars currently known. This pulsar and PSR J1905+0400 (P=3.8ms) are both solitary. We also provide orbital parameters for a new binary system, PSR J14205625, which has P=34ms, an orbital period of 40d and a minimum companion mass of 0.4M_{sun}_. The 10{deg}-wide strip along the Galactic plane that was surveyed is known to contain 264 radio pulsars that were discovered prior to the multibeam pulsar survey. We have redetected almost all of these pulsars and provide new dispersion measure values and flux densities at 20cm for the redetected pulsars.
78. Parkes Multi-Beam Pulsar Survey new PSR
ID:
ivo://CDS.VizieR/J/MNRAS/335/275
Title:
Parkes Multi-Beam Pulsar Survey new PSR
Short Name:
J/MNRAS/335/275
Date:
21 Oct 2021
Publisher:
CDS
Description:
The Parkes Multibeam Pulsar Survey is a sensitive survey of a strip of the Galactic plane with |b|<5{deg} and 260{deg}<l<50{deg} at 1374MHz. Here we report the discovery of 120 new pulsars and subsequent timing observations, primarily using the 76-m Lovell radio telescope at Jodrell Bank. The main features of the sample of 370 published pulsars discovered during the multibeam survey are described. Furthermore, we highlight two pulsars: PSR J1734-3333, a young pulsar with the second highest surface magnetic field strength among the known radio pulsars, B_S_=5.4x10^13^G, and PSR J1830-1135, he second slowest radio pulsar known, with a 6-s period.
79. Parkes Multibeam Pulsar Survey. VI.
ID:
ivo://CDS.VizieR/J/MNRAS/372/777
Title:
Parkes Multibeam Pulsar Survey. VI.
Short Name:
J/MNRAS/372/777
Date:
21 Oct 2021
Publisher:
CDS
Description:
We present the discovery and follow-up observations of 142 pulsars found in the Parkes 20-cm multibeam pulsar survey of the Galactic plane. These new discoveries bring the total number of pulsars found by the survey to 742. In addition to tabulating spin and astrometric parameters, along with pulse width and flux density information, we present orbital characteristics for 13 binary pulsars which form part of the new sample. Combining these results from another recent Parkes multibeam survey at high Galactic latitudes, we have a sample of 1008 normal pulsars which we use to carry out a determination of their Galactic distribution and birth rate. We infer a total Galactic population of 30000+/-1100 potentially detectable pulsars (i.e. those beaming towards us) having 1.4-GHz luminosities above 0.1mJy*kpc^2^.
80. Parkes Radio Telescope pulsar timing
ID:
ivo://CDS.VizieR/J/other/PASA/27.64
Title:
Parkes Radio Telescope pulsar timing
Short Name:
J/other/PASA/27.
Date:
21 Oct 2021
Publisher:
CDS
Description:
We report here on two years of timing of 168 pulsars using the Parkes radio telescope. The vast majority of these pulsars have spin-down luminosities in excess of 10^34^erg/s and are prime target candidates to be detected in gamma-rays by the Fermi Gamma-Ray Space Telescope. We provide the ephemerides for the ten pulsars being timed at Parkes which have been detected by Fermi in its first year of operation. These ephemerides, in conjunction with the publicly available photon list, can be used to generate gamma-ray profiles from the Fermi archive. We will make the ephemerides of any pulsars of interest available to the community upon request. In addition to the timing ephemerides, we present the parameters for 14 glitches which have occurred in 13 pulsars, seven of which have no previously known glitch history. The Parkes timing programme, in conjunction with Fermi observations, is expected to continue for at least the next four years.