HELP: XID plus , the probabilistic de-blender for Herschel SPIRE maps

被引：104

作者：

Hurley, P. D. ^{[1
]}

Oliver, S. ^{[1
]}

Betancourt, M. ^{[2
]}

Clarke, C. ^{[1
]}

Cowley, W. I. ^{[3
]}

Duivenvoorden, S. ^{[1
]}

Farrah, D. ^{[4
]}

Griffin, M. ^{[5
]}

Lacey, C. ^{[3
]}

Le Floc'h, E. ^{[6
]}

Papadopoulos, A. ^{[7
]}

Sargent, M. ^{[1
]}

Scudder, J. M. ^{[1
]}

Vaccari, M. ^{[8
,9
]}

Valtchanov, I. ^{[10
]}

Wang, L. ^{[11
,12
]}

机构：

[1] Univ Sussex, Dept Phys & Astron, Astron Ctr, Brighton BN1 9QH, E Sussex, England

[2] Univ Warwick, Dept Stat, Coventry CV4 7AL, W Midlands, England

[3] Univ Durham, Dept Phys, Inst Computat Cosmol, South Rd, Durham DH1 3LE, England

[4] Virginia Polytech Inst & State Univ, Dept Phys, MC 0435,910 Drillfield Dr, Blacksburg, VA 24061 USA

[5] Cardiff Univ, Cardiff Sch Phys & Astron, Queens Buildings, Cardiff CF24 3AA, S Glam, Wales

[6] CEA Saclay, Serv Astrophys, Bat 709, F-91191 Gif Sur Yvette, France

[7] European Univ Cyprus, 6,Diogenis Str,POB 22006, CY-1516 Nicosia, Cyprus

[8] Univ Western Cape, Dept Phys & Astron, Robert Sobukwe Rd, ZA-7535 Cape Town, South Africa

[9] INAF, Ist Radioastron, Via Gobetti 101, I-40129 Bologna, Italy

[10] ESA, ESAC, Herschel Sci Ctr, E-28080 Madrid, Spain

[11] SRON Netherlands Inst Space Res, Landleven 12, NL-9747 AD Groningen, Netherlands

[12] Univ Groningen, Kapteyn Astron Inst, Postbus 800, NL-9700 AV Groningen, Netherlands

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2017年 / 464卷 / 01期

基金：

英国科学技术设施理事会; 英国工程与自然科学研究理事会;

关键词：

methods:statistical; galaxies:statistics; infrared:galaxies; SPECTRAL ENERGY-DISTRIBUTIONS; MU-M; GALAXIES; CAMERA; BLAST;

D O I：

10.1093/mnras/stw2375

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We have developed a new prior-based source extraction tool, XID+, to carry out photometry in the Herschel SPIRE (Spectral and Photometric Imaging Receiver) maps at the positions of known sources. XID+ is developed using a probabilistic Bayesian framework that provides a natural framework in which to include prior information, and uses the Bayesian inference tool Stan to obtain the full posterior probability distribution on flux estimates. In this paper, we discuss the details of XID+ and demonstrate the basic capabilities and performance by running it on simulated SPIRE maps resembling the COSMOS field, and comparing to the current prior-based source extraction tool DESPHOT. Not only we show that XID+ performs better on metrics such as flux accuracy and flux uncertainty accuracy, but we also illustrate how obtaining the posterior probability distribution can help overcome some of the issues inherent with maximum-likelihood-based source extraction routines. We run XID+ on the COSMOS SPIRE maps from Herschel Multi-Tiered Extragalactic Survey using a 24-mu m catalogue as a positional prior, and a uniform flux prior ranging from 0.01 to 1000 mJy. We show the marginalized SPIRE colour-colour plot and marginalized contribution to the cosmic infrared background at the SPIRE wavelengths. XID+ is a core tool arising from the Herschel Extragalactic Legacy Project (HELP) and we discuss how additional work within HELP providing prior information on fluxes can and will be utilized. The software is available at https://github.com/H-E-L-P/XID_plus. We also provide the data product for COSMOS. We believe this is the first time that the full posterior probability of galaxy photometry has been provided as a data product.

引用

页码：885 / 896

页数：12

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