Dictionary of Nomenclature of Celestial Objects

 io Sky at Twenty-cm= (FRS) 
Details on Acronym:   FIRST
   FIRST Write:<<FIRST JHHMMSS.s+DDMMSS>> N: 236040+946432 Object:(Rad)  (SIMBAD class: Radio = Radio-source) Note:FIRST survey produces the radio equivalent (at 20 cm) of the Palomar Observatory Sky Survey over 10000 square degrees of the North Galactic Cap. Using the NRAO Very Large Array (VLA) and an automated mapping pipeline, images are produced with 1.8" pixels, a typical rms of 0.15mJy, and a resolution of 5".
At the 1mJy source detection threshold, there are 90 sources per square degree, 35per100 of which have resolved structure on scales from 2-20".
The FIRST survey is described in Becker+ 1995ApJ...450..559B, and more details are given in 1997ApJ....475..479W.
The final version of the catalog is described in 2015ApJ...801...26H.
Format of objects in the catalogue is 'HHMMSS.sss+DDMMSS.ss', since the actual accuracy of the positions requires this precision, but the authors used the format 'HHMMSS.s+DDMMSS' for designation. Ref:=1997ApJ...475..479W byWHITE R.L. , BECKER R.H., HELFAND D.J., GREGG M.D. Astrophys. J., 475, 479-493 (1997) A catalog of 1.4 GHz radio sources from the FIRST survey. o<FIRST JHHMMSS.s+DDMMSS> N=138664 Ref:=2015ApJ...801...26H byHELFAND D.J. , WHITE R.L., BECKER R.H. Astrophys. J., 801, 26 (2015) The last of FIRST: the final catalog and source identifications. o<FIRST JHHMMSS.s+DDMMSS> N=946432. =E=Catalogue in electronic form as <VIII/59/> =E=Catalogue in electronic form as <VIII/71/> =E=Catalogue in electronic form as <VIII/90/> =E=Catalogue in electronic form as <VIII/92/> Originof the Acronym: A = Assigned by the author(s)

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