The ASKAP Variables and Slow Transients (VAST) Pilot Survey
The ASKAP Variables and Slow Transients (VAST) Pilot Survey
复制标题
DOI：
10.1017/pasa.2021.44
复制
发表时间：
2021-08
影响因子：
6.3
通讯作者：
T. Murphy;D. Kaplan;A. Stewart;A. O’Brien;E. Lenc;S. Pintaldi;J. Pritchard;D. Dobie;Archibald Fox;J. Leung;T. An;M. Bell;J. Broderick;S. Chatterjee;S. Dai;Daniele d'Antonio;G. Doyle;B. Gaensler;G. Heald;A. Horesh;Megan L. Jones;D. McConnell;V. Moss;W. Raja;G. Ramsay;S. Ryder;E. Sadler;G. Sivakoff;Yuanming Wang;Ziteng Wang;M. Wheatland;M. Whiting;J. Allison;C. Anderson;L. Ball;K. Bannister;D. Bock;R. Bolton;J. Bunton;R. Chekkala;A. Chippendale;F. Cooray;N. Gupta;D. Hayman;K. Jeganathan;B. Koribalski;K. Lee-Waddell;E. Mahony;J. Marvil;N. McClure-Griffiths;P. Mirtschin;A. Ng;S. Pearce;C. Phillips;M. Voronkov
中科院分区：
文献类型：
--
作者：
T. Murphy;D. Kaplan;A. Stewart;A. O’Brien;E. Lenc;S. Pintaldi;J. Pritchard;D. Dobie;Archibald Fox;J. Leung;T. An;M. Bell;J. Broderick;S. Chatterjee;S. Dai;Daniele d'Antonio;G. Doyle;B. Gaensler;G. Heald;A. Horesh;Megan L. Jones;D. McConnell;V. Moss;W. Raja;G. Ramsay;S. Ryder;E. Sadler;G. Sivakoff;Yuanming Wang;Ziteng Wang;M. Wheatland;M. Whiting;J. Allison;C. Anderson;L. Ball;K. Bannister;D. Bock;R. Bolton;J. Bunton;R. Chekkala;A. Chippendale;F. Cooray;N. Gupta;D. Hayman;K. Jeganathan;B. Koribalski;K. Lee-Waddell;E. Mahony;J. Marvil;N. McClure-Griffiths;P. Mirtschin;A. Ng;S. Pearce;C. Phillips;M. Voronkov
澳大利亚平方公里阵列探测器（ASKAP）上的变量和慢瞬变测量（VAST）旨在探测时间尺度从5s到$\sim\的高度可变和瞬变射电源。5$ yr.在本文中，我们提出的调查描述，观测策略和初步结果，从VAST第一阶段试点调查。此试点调查包括$\sim\！在2019年8月至2020年8月期间，在888 MHz的中心频率下进行了162$ h的观测，典型均方根灵敏度为0.24 mJy ^{-1}$，角分辨率为12 -20$ arcseconds。有113个场，每个场观察12分钟的积分时间，重复5到13次，节奏在1天到8个月之间。试点调查足迹的总面积为5131平方度，覆盖天空的六个不同区域。对其中两个区域的初步搜索，总共1 646平方度，发现了28个高度可变和/或瞬态源。其中七颗是已知的脉冲星，包括毫秒脉冲星J2039-5617。另外七颗是恒星，其中四颗以前没有报告过无线电探测（SCR J 0533 -4257，LEHPM 2-783，UCAC 3 89-412162和2 MASS J22414436-6119311）。在剩下的14个源中，两个是活动星系核，六个与星系有关，其他六个没有多波长对应物，尚未确定。
Abstract The Variables and Slow Transients Survey (VAST) on the Australian Square Kilometre Array Pathfinder (ASKAP) is designed to detect highly variable and transient radio sources on timescales from 5 s to $\sim\!5$ yr. In this paper, we present the survey description, observation strategy and initial results from the VAST Phase I Pilot Survey. This pilot survey consists of $\sim\!162$ h of observations conducted at a central frequency of 888 MHz between 2019 August and 2020 August, with a typical rms sensitivity of $0.24\ \mathrm{mJy\ beam}^{-1}$ and angular resolution of $12-20$ arcseconds. There are 113 fields, each of which was observed for 12 min integration time, with between 5 and 13 repeats, with cadences between 1 day and 8 months. The total area of the pilot survey footprint is 5 131 square degrees, covering six distinct regions of the sky. An initial search of two of these regions, totalling 1 646 square degrees, revealed 28 highly variable and/or transient sources. Seven of these are known pulsars, including the millisecond pulsar J2039–5617. Another seven are stars, four of which have no previously reported radio detection (SCR J0533–4257, LEHPM 2-783, UCAC3 89–412162 and 2MASS J22414436–6119311). Of the remaining 14 sources, two are active galactic nuclei, six are associated with galaxies and the other six have no multi-wavelength counterparts and are yet to be identified.