RADIO SOURCES IN THE NCP REGION OBSERVED WITH THE 21 CENTIMETER ARRAY
RADIO SOURCES IN THE NCP REGION OBSERVED WITH THE 21 CENTIMETER ARRAY
复制标题
使用 21 厘米阵列观测到的 NCP 地区的无线电源
DOI：
10.3847/0004-637x/832/2/190
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发表时间：
2016-02
影响因子：
4.9
通讯作者：
Xu Haiguang
中科院分区：
文献类型：
--
作者：
Zheng Qian;Wu Xiang-Ping;Johnston-Hollitt Melanie;Gu Jun-hua;Xu Haiguang
我们提出了一个目录的624个无线电源探测到北天极（NCP）与21厘米阵列（21 CMA），无线电干涉仪致力于再电离时代（EoR）的统计测量。这些数据来自2013年4月13日进行的12小时观测，频率覆盖范围为75至175 MHz，角分辨率为104 ′。该目录包括21 CMA带宽上8个子波段的通量密度，并提供了探测到的源的带内光谱指数。为了减少所谓的“w”项和电离层效应导致的干涉成像的复杂性，本分析仅限于1500 m范围内的东西基线。624个射电源在NCP周围5°范围内被发现，最低可达10.1 Jy。我们的源计数进行了比较，也表现出很好的协议，与深低频观测最近与GMRT和MWA。特别是，对于微弱的无线电源低于101 Jy，我们发现一个平坦的趋势，源计数向较低的频率。虽然热噪声（0.4mJy）被很好地控制到低于混淆极限，但当前21 CMA成像的动态范围（0.104）和灵敏度在很大程度上受到校准和去卷积误差的限制，特别是NCP场中非常明亮的光源（如3C061.1）的栅瓣，这是由21 CMA的规则间距引起的。我们注意到，应特别注意扩展源，它们的建模和去除可能对当前EoR实验构成巨大的技术挑战。我们的分析可以作为一个有用的指导下一代低频干涉仪的设计，如平方公里阵列。
We present a catalog of 624 radio sources detected around the North Celestial Pole (NCP) with the 21 Centimeter Array (21CMA), a radio interferometer dedicated to the statistical measurement of the epoch of reionization (EoR). The data are taken from a 12 hr observation made on 2013 April 13, with a frequency coverage from 75 to 175 MHz and an angular resolution of ∼4′. The catalog includes flux densities at eight sub-bands across the 21CMA bandwidth and provides the in-band spectral indices for the detected sources. To reduce the complexity of interferometric imaging from the so-called “w” term and ionospheric effects, the present analysis is restricted to the east–west baselines within 1500 m only. The 624 radio sources are found within 5° around the NCP down to ∼0.1 Jy. Our source counts are compared, and also exhibit a good agreement, with deep low-frequency observations made recently with the GMRT and MWA. In particular, for fainter radio sources below ∼1 Jy, we find a flattening trend of source counts toward lower frequencies. While the thermal noise (∼0.4 mJy) is well controlled to below the confusion limit, the dynamical range (∼104) and sensitivity of current 21CMA imaging are largely limited by calibration and deconvolution errors, especially the grating lobes of very bright sources, such as 3C061.1, in the NCP field, which result from the regular spacings of the 21CMA. We note that particular attention should be paid to the extended sources, and their modeling and removal may constitute a large technical challenge for current EoR experiments. Our analysis may serve as a useful guide to the design of next generation low-frequency interferometers like the Square Kilometre Array.
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影响因子：
5
作者：
J. Pritchard;A. Loeb
通讯作者：
J. Pritchard;A. Loeb
影响因子：
6.5
作者：
V. Jelić;V. Jelić;A. Bruyn;A. Bruyn;M. Mevius;F. Abdalla;K. Asad;G. Bernardi;M. Brentjens;S. Bus;E. Chapman;B. Ciardi;S. Daiboo;Elizabeth Fernandez;A. Ghosh;G. Harker;H. Jensen;S. Kazemi;L. Koopmans;P. Labropoulos;O. Martinez-Rubi;G. Mellema;A. Offringa;V. Pandey;A. H. Patil;R. Thomas;H. Vedantham;V. Veligatla;S. Yatawatta;S. Zaroubi;A. Alexov;James M. Anderson;I. Avruch;I. Avruch;R. Beck;M. Bell;M. Bentum;P. Best;A. Bonafede;J. Bregman;F. Breitling;J. Broderick;W. Brouw;W. Brouw;M. Brüggen;H. Butcher;J. Conway;F. Gasperin;E. D. Geus;A. Deller;R. Dettmar;S. Duscha;J. Eislöffel;D. Engels;H. Falcke;H. Falcke;R. Fallows;R. Fender;C. Ferrari;W. Frieswijk;M. Garrett;J. Grießmeier;A. Gunst;J. Hamaker;T. Hassall;M. Haverkorn;M. Haverkorn;G. Heald;J. Hessels;M. Hoeft;J. Hörandel;A. Horneffer;A. Horst;M. Iacobelli;E. Juette;A. Karastergiou;V. Kondratiev;M. Kramer;M. Kramer;M. Kuniyoshi;G. Kuper;J. V. Leeuwen;P. Maat;G. Mann;D. McKay-Bukowski;D. McKay-Bukowski;J. McKean;H. Munk;A. Nelles;M. Norden;H. Paas;M. Pandey-Pommier;G. Pietka;R. Pizzo;A. Polatidis;W. Reich;H. Röttgering;A. Rowlinson;A. Scaife;D. Schwarz;M. Serylak;O. Smirnov;M. Steinmetz;A. Stewart;M. Tagger;Y. Tang;C. Tasse;S. Veen;S. Thoudam;C. Toribio;R. Vermeulen;C. Vocks;R. V. Weeren;R. Wijers;S. Wijnholds;O. Wucknitz;O. Wucknitz;P. Zarka
通讯作者：
V. Jelić;V. Jelić;A. Bruyn;A. Bruyn;M. Mevius;F. Abdalla;K. Asad;G. Bernardi;M. Brentjens;S. Bus;E. Chapman;B. Ciardi;S. Daiboo;Elizabeth Fernandez;A. Ghosh;G. Harker;H. Jensen;S. Kazemi;L. Koopmans;P. Labropoulos;O. Martinez-Rubi;G. Mellema;A. Offringa;V. Pandey;A. H. Patil;R. Thomas;H. Vedantham;V. Veligatla;S. Yatawatta;S. Zaroubi;A. Alexov;James M. Anderson;I. Avruch;I. Avruch;R. Beck;M. Bell;M. Bentum;P. Best;A. Bonafede;J. Bregman;F. Breitling;J. Broderick;W. Brouw;W. Brouw;M. Brüggen;H. Butcher;J. Conway;F. Gasperin;E. D. Geus;A. Deller;R. Dettmar;S. Duscha;J. Eislöffel;D. Engels;H. Falcke;H. Falcke;R. Fallows;R. Fender;C. Ferrari;W. Frieswijk;M. Garrett;J. Grießmeier;A. Gunst;J. Hamaker;T. Hassall;M. Haverkorn;M. Haverkorn;G. Heald;J. Hessels;M. Hoeft;J. Hörandel;A. Horneffer;A. Horst;M. Iacobelli;E. Juette;A. Karastergiou;V. Kondratiev;M. Kramer;M. Kramer;M. Kuniyoshi;G. Kuper;J. V. Leeuwen;P. Maat;G. Mann;D. McKay-Bukowski;D. McKay-Bukowski;J. McKean;H. Munk;A. Nelles;M. Norden;H. Paas;M. Pandey-Pommier;G. Pietka;R. Pizzo;A. Polatidis;W. Reich;H. Röttgering;A. Rowlinson;A. Scaife;D. Schwarz;M. Serylak;O. Smirnov;M. Steinmetz;A. Stewart;M. Tagger;Y. Tang;C. Tasse;S. Veen;S. Thoudam;C. Toribio;R. Vermeulen;C. Vocks;R. V. Weeren;R. Wijers;S. Wijnholds;O. Wucknitz;O. Wucknitz;P. Zarka
DOI：
--
发表时间：
2014
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
R. V. van Weeren;W. Williams;C. Tasse;H. Röttgering;D. Rafferty;S. van der Tol;G. Heald;G. White;A. Shulevski;P. Best;H. Intema;S. Bhatnagar;W. Reich;M. Steinmetz;Sanne G M van Velzen;T. Ensslin;I. Prandoni;F. de Gasperin;M. Jamrozy;G. Brunetti;M. Jarvis;J. McKean;M. Wise;C. Ferrari;J. Harwood;J. Oonk;M. Hoeft;M. Kunert‐Bajraszewska;C. Horellou;O. Wucknitz;A. Bonafede;N. Mohan;A. Scaife;H. Klöckner;I. van Bemmel;A. Merloni;K. Chyży;D. Engels;H. Falcke;M. Pandey-Pommier;A. Alexov;J. Anderson;I. Avruch;R. Beck;M. Bell;M. Bentum;G. Bernardi;F. Breitling;J. Broderick;W. Brouw;M. Brüggen;H. Butcher;B. Ciardi;E. de Geus;M. DE VOS;A. Deller;S. Duscha;J. Eislöffel;R. Fallows;W. Frieswijk;M. Garrett;J. Grießmeier;A. Gunst;J. Hamaker;T. Hassall;J. Hörandel;A. J. van der Horst;M. Iacobelli;N. Jackson;E. Juette;V. Kondratiev;M. Kuniyoshi;P. Maat;G. Mann;D. McKay-Bukowski;M. Mevius;R. Morganti;H. Munk;A. Offringa;E. Orrú;H. Paas;V. Pandey;G. Pietka;R. Pizzo;A. Polatidis;A. Renting;A. Rowlinson;D. Schwarz;M. Serylak;J. Sluman;O. Smirnov;B. Stappers;A. Stewart;J. Swinbank;M. Tagger;Y. Tang;S. Thoudam;C. Toribio;R. Vermeulen;C. Vocks;P. Zarka
通讯作者：
R. V. van Weeren;W. Williams;C. Tasse;H. Röttgering;D. Rafferty;S. van der Tol;G. Heald;G. White;A. Shulevski;P. Best;H. Intema;S. Bhatnagar;W. Reich;M. Steinmetz;Sanne G M van Velzen;T. Ensslin;I. Prandoni;F. de Gasperin;M. Jamrozy;G. Brunetti;M. Jarvis;J. McKean;M. Wise;C. Ferrari;J. Harwood;J. Oonk;M. Hoeft;M. Kunert‐Bajraszewska;C. Horellou;O. Wucknitz;A. Bonafede;N. Mohan;A. Scaife;H. Klöckner;I. van Bemmel;A. Merloni;K. Chyży;D. Engels;H. Falcke;M. Pandey-Pommier;A. Alexov;J. Anderson;I. Avruch;R. Beck;M. Bell;M. Bentum;G. Bernardi;F. Breitling;J. Broderick;W. Brouw;M. Brüggen;H. Butcher;B. Ciardi;E. de Geus;M. DE VOS;A. Deller;S. Duscha;J. Eislöffel;R. Fallows;W. Frieswijk;M. Garrett;J. Grießmeier;A. Gunst;J. Hamaker;T. Hassall;J. Hörandel;A. J. van der Horst;M. Iacobelli;N. Jackson;E. Juette;V. Kondratiev;M. Kuniyoshi;P. Maat;G. Mann;D. McKay-Bukowski;M. Mevius;R. Morganti;H. Munk;A. Offringa;E. Orrú;H. Paas;V. Pandey;G. Pietka;R. Pizzo;A. Polatidis;A. Renting;A. Rowlinson;D. Schwarz;M. Serylak;J. Sluman;O. Smirnov;B. Stappers;A. Stewart;J. Swinbank;M. Tagger;Y. Tang;S. Thoudam;C. Toribio;R. Vermeulen;C. Vocks;P. Zarka
影响因子：
3.5
作者：
J. Holder
通讯作者：
J. Holder
影响因子：
6.3
作者：
R. Wayth;E. Lenc;M. Bell;J. Callingham;J. Callingham;K. Dwarakanath;T. Franzen;B. For;B. Gaensler-B
通讯作者：
R. Wayth;E. Lenc;M. Bell;J. Callingham;J. Callingham;K. Dwarakanath;T. Franzen;B. For;B. Gaensler-B