THE ALLEN TELESCOPE ARRAY TWENTY-CENTIMETER SURVEY-A 690 DEG(2), 12 EPOCH RADIO DATA SET. I. CATALOG AND LONG-DURATION TRANSIENT STATISTICS
Artikel i vetenskaplig tidskrift, 2010

We present the Allen Telescope Array Twenty-centimeter Survey (ATATS), a multi-epoch (12 visits), 690 deg(2) radio image and catalog at 1.4 GHz. The survey is designed to detect rare, very bright transients as well as to verify the capabilities of the ATA to form large mosaics. The combined image using data from all 12 ATATS epochs has rms noise sigma = 3.94 mJy beam(-1) and dynamic range 180, with a circular beam of 150 '' FWHM. It contains 4408 sources to a limiting sensitivity of 5 sigma = 20 mJy beam(-1). We compare the catalog generated from this 12 epoch combined image to the NRAO VLA Sky Survey (NVSS), a legacy survey at the same frequency, and find that we can measure source positions to better than similar to 20 ''. For sources above the ATATS completeness limit, the median flux density is 97% of the median value for matched NVSS sources, indicative of an accurate overall flux calibration. We examine the effects of source confusion due to the effects of differing resolution between ATATS and NVSS on our ability to compare flux densities. We detect no transients at flux densities greater than 40 mJy in comparison with NVSS and place a 2 sigma upper limit of 0.004 deg(-2) on the transient rate for such sources. These results suggest that the greater than or similar to 1 Jy transients reported by Matsumara et al. may not be true transients, but rather variable sources at their flux density threshold.

galaxy

bursts

wide-field survey

emission

surveys

neutron-stars

discovery

radio continuum: galaxies

observational evidence

millimeter

variability

jet

catalogs

Författare

S. Croft

University of California

G. C. Bower

University of California

R. Ackermann

SETI Institute

S. Atkinson

SETI Institute

D. Backer

University of California

P. Backus

SETI Institute

W. Barott

Embry Riddle Aeronautical University

A. Bauermeister

University of California

L. Blitz

University of California

D. Bock

University of California

T. Bradford

SETI Institute

C. Cheng

University of California

C. Cork

Minex Engineering

M. Davis

SETI Institute

D. DeBoer

Australia Telescope National Facility

M. Dexter

University of California

J. Dreher

SETI Institute

G. Engargiola

University of California

E. Fields

University of California

M. Fleming

Minex Engineering

J. Forster

University of California

C. Gutierrez-Kraybill

University of California

G. R. Harp

SETI Institute

T. Helfer

University of California

C. Hull

University of California

J. Jordan

SETI Institute

S. Jorgensen

University of California

G. Keating

University of California

T. Kilsdonk

SETI Institute

C. Law

University of California

J. van Leeuwen

Netherlands Institute for Radio Astronomy (ASTRON)

J. Lugten

Lawrence Livermore National Laboratory

D. MacMahon

University of California

P. McMahon

Stanford University

O. Milgrome

University of California

T. Pierson

SETI Institute

K. Randall

SETI Institute

J. Ross

SETI Institute

S. Shostak

SETI Institute

A. Siemion

University of California

K. Smolek

SETI Institute

J. Tarter

SETI Institute

D. Thornton

University of California

L. Urry

University of California

A. Vitouchkine

Minex Engineering

Niklas Wadefalk

Chalmers, Mikroteknologi och nanovetenskap (MC2), Mikrovågselektronik

J. Welch

University of California

D. Werthimer

University of California

D. Whysong

University of California

P. K. G. Williams

University of California

M. Wright

University of California

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 719 1 45-58

Ämneskategorier

Elektroteknik och elektronik

DOI

10.1088/0004-637X/719/1/45

Mer information

Senast uppdaterat

2018-04-20