Документ взят из кэша поисковой машины. Адрес оригинального документа : http://www.sao.ru/cats/doc/MITG1-4.html
Дата изменения: Wed Mar 18 12:25:11 2015
Дата индексирования: Sun Apr 10 02:01:11 2016
Кодировка:
HTML> MIT_GB catalogs [ CATS home ] [ Back to CATS list ] [ ftp ]


1986ApJS...61....1Bennett+ First ADS
1990ApJS...72..621Langston+ Second ADS
1990ApJS...74..129Griffith+ Third ADS
1991ApJS...75..801Griffith+ Fourth ADS

Abstracts for MIT-Green Bank surveys I through IV

The MIT - Green Bank 5 GHz Survey.
ABSTRACT. The MIT-Green Bank (MG) 5 GHz survey covers 1.87 sr of sky in the declination range between -0.508 and 19.496 degrees, and galactic latitude, b, above |b| > 10 degrees. The MG catalog contains 5974 sources with a signal-to-noise ratio greater than 5. A supplemental catalog contains 3836 possible detections with a signal-to-noise ratio less than 5. The MG catalog is essentially complete to its 5 sigma limit, which varies with declination from 53 to 106 mJy. The reliability of the main list has been measured to be 96 %, with a completeness of 95 %. Estimated position errors are +/- 28 arc seconds in right ascension and +/- 22 arc seconds in declination. Flux density errors are a function of flux density.

The MG survey sources are compared with sources from the 365 MHz Texas survey (Douglas et al. 1980, Univ. Texas Pub. Astro. No. 17). Spectral indices are computed for coincident sources, and the distribution of spectral indices is discussed. Follow-up observations using the VLA and other instruments are discussed. The source names are derived from the J2000 coordinates preceded by the two characters MG.

Published: Astrophysical Journal Supplement Series, Vol. 61, pages 1-104, 1986 May
CHARLES BENNETT: NASA/Goddard Space Flight Center, Code 697, Greenbelt MD. 20771
BERNARD BURKE, JACQUELINE HEWITT, CHARLES LAWRENCE, and JAMES MAHONEY: Room 26-335, Massachusetts Institute of Technology, Cambridge, MA 02139 (Phone 1-617-253-3074)
Information available from GLEN LANGSTON: National Radio Astronomy Observatory Edgemont Rd., Charlottesville VA 22903 (Phone 1-804-296-0328)

Second MIT - Green Bank 5 GHz Survey.
ABSTRACT. The MIT-Green Bank II (MG II) 5 GHz survey covers 1.51 sr of sky in the right ascension range 4 to 21 hours, between 17 and 39.15 degrees declination (J2000). The final MG II catalog contains 6182 sources detected with a signal-to-noise ratio greater than 5. The catalog was produced from two separate north and south surveys with the National Radio Astronomy Observatory (NRAO) 91m transit telescope. The north survey was produced from data collected scanning the telescope north from 19.0 to 39.15 degrees declination and the south survey from data collected from scans between 37.15 and 17 degrees declination. The completeness and reliability of the final source list is checked by examination of the north and south source lists in a comparison region, lying between 19.15 and 37 degrees and above 10 degrees north galactic latitude. The comparison region covers 0.884 sr of sky and contains 3384 sources. In this region, the catalog contains 1387 sources brighter than 90 mJy and is shown to be 99.9% complete at this flux density level. Spectral indices are computed for sources identified in the NRAO 1400 MHz Survey (Condon and Broderick 1985). The source names are derived from the J2000 coordinates preceded by the three characters MGB. The MG I, MG III and MG IV observations have prefixes MG, MGC, and MGD respectively.

Published: Astrophysical Journal Supplement Series, Vol. 72, pages 621-691 1990 March

GLEN LANGSTON: National Radio Astronomy Observatory Edgemont Rd., Charlottesville VA 22903 (Phone 1-804-296-0328)

BERNARD BURKE, CHRIS CARRILLI, SAM CONNER, MIKE HEFLIN, and JOSEPH LEHAR: Room 26-335, Massachusetts Institute of Technology, Cambridge, MA 02139 (Phone 1-617-253-3074)

The Third MIT - Green Bank 5 GHz Survey.
ABSTRACT. The MIT-Green Bank III (MG III) 5 GHz survey covers 1.11 sr of sky in the right ascension range 16.5 to 5 hours, between +17 and +39.15 degrees declination (B1950). The final MG III catalog contains 4761 sources detected with a signal-to-noise ratio greater than 5. The catalog was produced from two separate north and south surveys with the National Radio Astronomy Observatory (NRAO) 91 meter transit telescope. The north survey was produced from data collected while scanning the telescope north from +19.0 to +39.15 degrees declination and the south survey from data collected from scans from +37.15 to +17 degrees declination. The completeness and reliability of the final source list is checked by examination of north and south source lists in a twice observed comparison region, lying between +19.15 and +37 degrees and below -10 degrees galactic latitude. The comparison region covers 0.569 sr of sky and contains 2412 sources. In this region, the MG III catalog contains 917 sources brighter than 90 mJy and is shown to be 99.8 +/-0.4 % complete at this flux density level. Spectral indices are computed for sources identified in the NRAO 1400 MHz Survey (Condon and Broderick 1985).

The source names are derived from the J2000 coordinates preceded by the three characters MGC. The MG I, MG II and MG IV observations have prefixes MG, MGB, and MGD respectively.

Published: Astrophysical Journal Supplement Series, 1990 September ApJSS, 74, 129-224, 1990 Sep.

MARK GRIFFITH, BERNARD BURKE, SAM CONNER, MIKE HEFLIN, and JOSEPH LEHAR: Room 26-335, Massachusetts Institute of Technology, Cambridge, MA 02139 (Phone 1-617-253-2572)

GLEN LANGSTON: National Radio Astronomy Observatory Edgemont Rd., Charlottesville VA 22903 (Phone 1-804-296-0328)

Fourth MIT - Green Bank 5 GHz Survey.
ABSTRACT: The MIT-Green Bank IV (MG IV) 5 GHz survey covers 0.504 sr of sky in the right ascension range 15.5 to 2.5 hours, between +37.00 and +50.98 degrees declination (B1950). The final MG IV catalog contains 3427 sources detected with a signal-to-noise ratio greater than 5. The catalog was produced from two separate north and south surveys with the National Radio Astronomy Observatory (NRAO) 91m transit telescope. The north survey was produced from data collected while scanning the telescope north from +39.0 to +50.98 degrees declination and the south survey from data collected from scans from +48.98 to +37.00 degrees declination. The completeness and reliability of the final source list is checked by examination of north and south source lists in a twice observed comparison region, lying between +39.15 and +48.83 degrees declination and excluding the area between +/-10 degrees Galactic latitude. The comparison region covers 0.270 sr of sky and contains 1094 sources. In this region, the MG IV catalog contains 423 sources brighter than 90 mJy and is shown to be 99.1 +/- 1.2% complete at this flux density level. Spectral indices are computed for sources identified in the NRAO 1400 MHz Survey (published by Condon and Broderick in 1985). A comparison of the spectral index distributions between +/- 10 and outside of +/- 10 degrees Galactic latitude is presented.

The source names are derived from the J2000 coordinates preceded by the three characters MGD. The MG I, MG II and MG III observations have prefixes MG, MGB, and MGC respectively.

Published: Submitted to Astrophysical Journal Supplement Series AJSS, 75, 801-833, 1991 March

MARK GRIFFITH, BERNARD BURKE, SAM CONNER, and MIKE HEFLIN:
Room 26-335, Massachusetts Institute of Technology, Cambridge, MA 02139 (Phone 1-617-253-2572)

GLEN LANGSTON:
National Radio Astronomy Observatory , Edgemont Road, Charlottesville, Va 22903 (Phone 1-804-296-0328)


Structure of catalogs

MG_i.dat(A004)
   Name        RA 1950    DEC 1950    mJy   S/N    Spec(S=S0*v**f)
MGA0000+1903  23 57 46.4  18 46 52     72   6.0   -0.52
MGA0000+0306  23 57 51.2   2 50 11    118   7.0
MGA0000+1855  23 57 59.0  18 38 21    129  10.7
MG_i.sup(A004) (< 5 sigma)
MGA0001+0633  23 58 45.9   6 16 19     62   3.9
MGA0001+1353  23 58 52.4  13 36 36     66   4.8
MGA0001+0723  23 59  1.3   7  6 21     71   4.4
MGA0001+1819  23 59 21.1  18  3  2     49   4.0   -1.10
MG_ii.dat(A005)
      Name      RA 1950   DEC 1950    mJy S/N  G   Spec
MGB0400+3645   3 57  8.4  36 36 53     50   6  7  -2.47
MGB0400+3649   3 57 10.2  36 41 23     53   6  7  -2.31
MGB0400+3246   3 57 15.6  32 38  7     51   6  7  -1.29
MG_iii.dat(A013)
      Name      RA 1950   DEC 1950    mJy S/N  G   Spec
MGC0002+3032   0  0 14.0  30 15 31     66   8  6  -0.79
MGC0002+3043   0  0 20.3  30 26 32     51   5  6  -1.11
MGC0003+3747   0  0 35.8  37 30 33     51   5  4
MG_iv.dat (A012)
      Name       RA 1950   DEC 1950    mJy S/N  G   Spec
MGD0002+4820   0  0  2.4  48  3 57    153  15  6   0.59
MGD0003+4806   0  1  1.1  47 49 44    160  26  8
MGD0003+4602   0  1  9.6  45 45 31    105  12  6  -0.17