J/A+AS/108/79       Ultra-steep spectrum radiosources (Roettgering+, 1994)
============================================================================
Samples of ultra-steep spectrum radio sources
         ROETTGERING H.J.A., LACY M., MILEY G.K., CHAMBERS K.C., SAUNDERS R.
      
      =1994A&AS..108...79R      (SIMBAD/NED Reference)
=============================================================================

Keywords: astronomical data bases: surveys - galaxies: active -
          radio continuum: galaxies

File Summary:
----------------------------------------------------------------------------
 File Name   Lrecl    Records    Explanations
-----------------------------------------------------------------------------
ReadMe          80          .    This file
source         146       1168    Source list
source.tex     180       1531    LaTeX version of source
---------------------------------------------------------------------------

Byte-by-byte Description of file: source
-----------------------------------------------------------------------------
   Bytes Format  Units   Label   Explanations
-----------------------------------------------------------------------------
   1- 10  A10    ---     S       Name of the samples to which the source
                                  belongs
  12- 19  A8     ---     Name    Source name in IAU B1950.0 format
  21- 22  A2     ---   m_Name    Component designator:
                                  - a number indicates that the component
                                    belongs to the main central radio source.
                                  - a letter indicates that the object is
                                    bright (presumably) serendipitous source
                                    visible in the VLA map in a 4'x4' region
                                    surrounding the source.
                                  - a 'c' after a number indicates that this
                                    component is probably the core component.
  24- 25  I2     h       RAh     []? Right ascension J2000
  27- 28  I2     min     RAm     []? Right ascension J2000
  30- 34  F5.2   s       RAs     []? Right ascension J2000
      36  A1     ---     DE-     Declination sign
  37- 38  I2     deg     DEd     []? Declination J2000
  40- 41  I2     arcmin  DEm     []? Declination J2000
  43- 46  F4.1   arcsec  DEs     []? Declination J2000
  51- 52  I2     h       RAh2    []? Right ascension B1950
  54- 55  I2     min     RAm2    []? Right ascension B1950
  57- 61  F5.2   s       RAs2    []? Right ascension B1950
      63  A1     ---     DE-2    Declination sign
  64- 65  I2     deg     DEd2    []? Declination B1950
  67- 68  I2     arcmin  DEm2    []? Declination B1950
  70- 73  F4.1   arcsec  DEs2    []? Declination B1950
  75- 78  I4     mJy     Speak   Peak brightness
  80- 83  I4     mJy     Sint    []? Integrated flux density
  85- 88  F4.2   ---     R       []? Ratio of the integrated VLA flux density
                                      to the flux density obtained from the
                                      NRAO Green Bank 1400 MHz
  90- 94  F5.2   ---    alpha(l) []? Low frequency spectral index
  96- 99  F4.2   ---  e_alpha(l) []? Rms uncertainty on alpha(l)
 101-105  F5.2   ---    alpha(h) []? High frequency spectral index
 107-110  F4.2   ---  e_alpha(h) []? Rms uncertainty on alpha(h)
 112-125  A14    ---     Cat     Radio catalogues that have been used in
                                  the spectral index calculations (1)
 127-132  A6     ---   n_Cat     Notes on catalogues (2)
 134-135  A2     ---     Mul     [DPMTF ] D = double, P = point source,
                                          T = triple DF = diffuse, M = complex
     137  A1     ---   l_R       Limit flag on R
 138-142  F5.1   arcsec  R       []? Angular size measured from VLA maps
 144-146  I3     deg     PA      []? Position angle measured from VLA maps
-----------------------------------------------------------------------------
Note (1): a: 8C(38 MHz)   b: PKS(80 MHz)      c: 6C2(151 MHz)   d: PKS(178 MHz)
         e: TXS(365 MHz)  f: TXS:BWE(365 MHz) g: PKS(408 MHz)   h: MOL(408 Mhz)
         i: NRAO(1400 MHz) j: WB(1400 MHz)    k: PKS(1410 MHz)  l: VLA(1465 MHz)
         m: PKS(2700 MHz) n: NRAO(4850 MHz)   o: 87GB(4580 MHz) p: BWE(4589 MHz)
         q: WB(4580 MHz)  r: PKS(5000 MHz)
Note (2): Various flags indicating catalogue problems and/or confusion:
           Flags a to h have been directly copied from three catalogues
            at 1400 and 4850 MHz (WB, BWE and 87GB).
           Flags r to x indicate inconsistencies and  how various upper
            limits have been treated.
          *: The spectral index/indices is/are unreliable, since there are
              warnings in one of the three 1400/4580 MHz catalogues (a to h)
              and/or there is a bright confusing source in the VLA field (z)
          a: In WB a 1400 MHz source is reported to match more than one 1400 MHz
              or 365 MHz source so that confusion is likely
          b: In WB a 1400 MHz source is reported to be extended at  1400 MHz
          c: In WB a 1400 MHz source is reported to be extended at 4850 MHz
          d: In BWE a 4850 MHz  source is reported to be extended at 4850 MHz
             Note that the flags c and d are not always simultaneously present
          e: In the BWE the separation between the NRAO 4850 MHz and the
              Texas 365 MHz positions is reported to be greater than 100 arcsecs
          f: In 87GB a source is reported to be extended or a blend of two or
              more point sources (Flag E in the original catalogue)
          g: In 87GB  a source has a warning that it is a weak source with a
              large zero offset, a narrow minor axis, or possibly confused;
              less reliable than most (Flag W in the original catalogue)
          h: In 87GB  a source is reported to be confused (Flag C in the
              original catalogue)
          q: Difference of 4850 MHz flux densities of 87GB  and our fitting
              routines are greater than 10 mJy
          r: Difference in the 365 MHz flux densities from the version of the
              Texas catalogue that we used and the version that WB used
          u: Since no Texas flux density is present in WB catalogue, we used the
              flux density from our version of the Texas Catalogue
          v: No 1400 MHz flux densities in WB
          w: Since no 4850 MHz flux densities is present in WB, we used
              the 87GB 4850 MHz flux density
          x: No WB and 87GB 4850 MHz flux densities. Our determination for
              the 4850 MHz NRAO flux densities is used if
              this flux density >15mJy
          z: A bright serendipitous source in the VLA field
----------------------------------------------------------------------------

Notes on individual sources:
   0141+356 A serendipitous double radio galaxy in the field is present
             about 1.5 minutes from components `1' and `2'.
   0309-047 Component `A' is probably serendipitous.
   0707+810 This is resolved into two separate sources. The northern source has
             an asymmetric FRII structure; the southern a bright central
             component and low surface brightness lobes just detectable on the
             low-resolution VLA map.  CLFST observations show that both sources
             have similar fluxes at 151-MHz (~100 mJy for the northern source
             and ~150 mJy for the southern), but the southern source has a
             steeper spectral index; hence this object should dominate the flux
             at the selection frequency of 38-MHz.
   0906+691 The VLA map shows three diffuse components; a CLFST map shows two
             distinct sources, the southern of which is resolved into two
             components and may therefore either be a single large source or
             two smaller ones.
   1127+831 A Ryle Telescope map at 5GHz [calibrated and analysed as detailed in
             Lacy et al. (1993)] only detects component 1, but shows it to have
             a very steep radio spectrum (alpha^{1490}^_{5000}_=-1.1),
             suggesting that it is some form of hotspot.
   1227+609 It is not clear whether the three components are related.
   1323+080 It is not clear if component `2' is real.
   1345-309 Diffuse radio source. Coordinates are derived from the moments of
             the source brightness.
   1350+635 This 80 arcsec source has a faint central component and diffuse
             lobes which barely show up on the VLA map. CLFST observations
             confirm the presence of the lobes.
   1436+157 The double radio galaxy with components 'A' and 'B' is probably not
             related to the double radio galaxy with components '1' and '2'.
   1611+452 It is not clear whether the three components belong to one source.
   1652+027 Two components separated by 233", so may not be  a single source.
   1659+440 Component A probably is probably a separate serendipitous source.
   1718+630 Component '1' serendipitous or related to double radio source?
   1942+631 Component A related to central radio source ?
   2207+038 It is not clear whether the two components belong to one source.
   2324+071 Diffuse double lobed radio source. Position of lobes measure from
             the tapered maps.
   2335-125 It is not clear whether the two components belong to one source.
----------------------------------------------------------------------------
============================================================================
(End)                                      Patricia Bauer [CDS] 01-Jul-1994