From spin noise to systematics: stochastic processes in the first International Pulsar Timing Array data release

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	From spin noise to systematics: stochastic processes in the first International Pulsar Timing Array data release
	Lentati, L.1; Shannon, R. M.2,3; Coles, W. A.4; Verbiest, J. P. W.5,6; van Haasteren, R.7; Ellis, J. A.7; Caballero, R. N.6; Manchester, R. N.2; Arzoumanian, Z.8,9; Babak, S.10
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2016-05-11
卷号	458 期号:2 页码:2161-2187
关键词	methods: data analysis pulsars: general
ISSN号	0035-8711
英文摘要	We analyse the stochastic properties of the 49 pulsars that comprise the first International Pulsar Timing Array (IPTA) data release. We use Bayesian methodology, performing model selection to determine the optimal description of the stochastic signals present in each pulsar. In addition to spin-noise and dispersion-measure (DM) variations, these models can include timing noise unique to a single observing system, or frequency band. We show the improved radio-frequency coverage and presence of overlapping data from different observing systems in the IPTA data set enables us to separate both system and band-dependent effects with much greater efficacy than in the individual pulsar timing array (PTA) data sets. For example, we show that PSR J1643-1224 has, in addition to DM variations, significant band-dependent noise that is coherent between PTAs which we interpret as coming from time-variable scattering or refraction in the ionized interstellar medium. Failing to model these different contributions appropriately can dramatically alter the astrophysical interpretation of the stochastic signals observed in the residuals. In some cases, the spectral exponent of the spin-noise signal can vary from 1.6 to 4 depending upon the model, which has direct implications for the long-term sensitivity of the pulsar to a stochastic gravitational-wave (GW) background. By using a more appropriate model, however, we can greatly improve a pulsar's sensitivity to GWs. For example, including system and band-dependent signals in the PSR J0437-4715 data set improves the upper limit on a fiducial GW background by similar to 60 per cent compared to a model that includes DM variations and spin-noise only.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	BLACK-HOLE BINARIES ; FREQUENCY GRAVITATIONAL-RADIATION ; MILLISECOND PULSARS ; INTERSTELLAR PLASMA ; PRECISION ; WAVES ; DISPERSION ; LIMITS ; SCATTERING ; B1937+21
收录类别	SCI
语种	英语
WOS记录号	WOS:000374569600082
内容类型	期刊论文
源URL	[http://ir.xao.ac.cn/handle/45760611-7/1393]
专题	脉冲星研究团组新疆天文台_射电天文研究室新疆天文台_110米口径全可动射电望远镜（SmART）_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
作者单位	1.Univ Cambridge, Cavendish Lab, Astrophys Grp, JJ Thomson Ave, Cambridge CB3 0HE, England 2.Australia Telescope Natl Facil, CSIRO Astron & Space Sci, Box 76, Epping, NSW 1710, Australia 3.Curtin Univ, Int Ctr Radio Astron Res, Bentley, WA 6102, Australia 4.Univ Calif San Diego, ECE Dept, La Jolla, CA 92093 USA 5.Univ Bielefeld, Fak Phys, Postfach 100131, D-33501 Bielefeld, Germany 6.Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany 7.CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA 8.NASA, Goddard Space Flight Ctr, Ctr Res & Explorat Space Sci & Technol USRA, Code 662, Greenbelt, MD 20771 USA 9.NASA, Goddard Space Flight Ctr, X Ray Astrophys Lab, Code 662, Greenbelt, MD 20771 USA 10.Albert Einstein Inst, MPI Gravitat Phys, D-14476 Golm, Germany
推荐引用方式 GB/T 7714	Lentati, L.,Shannon, R. M.,Coles, W. A.,et al. From spin noise to systematics: stochastic processes in the first International Pulsar Timing Array data release[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2016,458(2):2161-2187.
APA	Lentati, L..,Shannon, R. M..,Coles, W. A..,Verbiest, J. P. W..,van Haasteren, R..,...&Zhu, X. -J..(2016).From spin noise to systematics: stochastic processes in the first International Pulsar Timing Array data release.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,458(2),2161-2187.
MLA	Lentati, L.,et al."From spin noise to systematics: stochastic processes in the first International Pulsar Timing Array data release".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 458.2(2016):2161-2187.