Low-frequency spectral turn-overs in millisecond pulsars studied from imaging observations
Kuniyoshi, M.1,2; Verbiest, J. P. W.1,3; Lee, K. J.1,4; Adebahr, B.1; Kramer, M.1; Noutsos, A.1
2015-10-01
Source PublicationMonthly Notices of the Royal Astronomical Society
ISSN0035-8711
Volume453Issue:1Pages:828-836
AbstractMeasurements of pulsar flux densities are of great importance for understanding the pulsar emission mechanism and for predictions of pulsar survey yields and the pulsar population at large. Typically these flux densities are determined from phase-averaged 'pulse profiles', but this method has limited applicability at low frequencies because the observed pulses can easily be spread out by interstellar effects like scattering or dispersion, leading to a non-pulsed continuum component that is necessarily ignored in this type of analysis. In particular for the class of the millisecond pulsars (MSPs) at frequencies below 200 MHz, such interstellar effects can seriously compromise detectability and measured flux densities. In this paper, we investigate MSP spectra based on a complementary approach, namely through investigation of archival continuum imaging data. Even though these images lose sensitivity to pulsars since the on-pulse emission is averaged with off-pulse noise, they are insensitive to effects from scattering and provide a reliable way to determine the flux density and spectral indices of MSPs based on both pulsed and unpulsed components. Using the 74 MHz VLSSr as well as the 325 MHz WENSS and 1.4 GHz NVSS catalogues, we investigate the imaging flux densities of MSPs and evaluate the likelihood of spectral turn-overs in this population. We determine three new MSP spectral indices and identify six new MSPs with likely spectral turn-overs.
Correspondent Emailmasaya.kuniyoshi@nao.ac.jp (mk) ; verbiest@physik.uni-bielefeld.de (jpwv)
KeywordPulsars: General
SubtypeArticle
DOI10.1093/mnras/stv1604
Indexed BySCI
Language英语
WOS KeywordVLA SKY SURVEY ; FLUX DENSITIES ; BINARY ; DISCOVERY ; MHZ ; EMISSION ; J0437-4715 ; TELESCOPE ; CATALOG
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000366215500064
Project Number2015CB857101 ; 11373011
Funding OrganizationNational Basic Research Program of China, 973 Program ; NSFC
Citation statistics
Cited Times:13[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.xao.ac.cn/handle/45760611-7/1626
Collection110米口径全可动射电望远镜(QTT)_110米大口径全可动射电望远镜关键技术研究(973项目)_课题1:大样本射电天体的观测和前沿问题研究
Corresponding AuthorKuniyoshi, M.; Verbiest, J. P. W.
Affiliation1.Max-Planck-Institut fur Radioastronomie, Auf dem Hugel 69, D-53121 Bonn, Germany
2.NAOJ Chile Observatory, National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
3.Fakultat fur Physik, Universitat Bielefeld, Postfach 100131, D-33501 Bielefeld, Germany
4.Kavli institute for astronomy and astrophysics, Peking University, Beijing 100871, People’s Republic of China
Recommended Citation
GB/T 7714
Kuniyoshi, M.,Verbiest, J. P. W.,Lee, K. J.,et al. Low-frequency spectral turn-overs in millisecond pulsars studied from imaging observations[J]. Monthly Notices of the Royal Astronomical Society,2015,453(1):828-836.
APA Kuniyoshi, M.,Verbiest, J. P. W.,Lee, K. J.,Adebahr, B.,Kramer, M.,&Noutsos, A..(2015).Low-frequency spectral turn-overs in millisecond pulsars studied from imaging observations.Monthly Notices of the Royal Astronomical Society,453(1),828-836.
MLA Kuniyoshi, M.,et al."Low-frequency spectral turn-overs in millisecond pulsars studied from imaging observations".Monthly Notices of the Royal Astronomical Society 453.1(2015):828-836.
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