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J/A+AS/108/79 Ultra-steep spectrum radiosources (Roettgering+, 1994)
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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)
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Keywords: astronomical data bases: surveys - galaxies: active -
radio continuum: galaxies
File Summary:
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File Name Lrecl Records Explanations
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ReadMe 80 . This file
source 146 1168 Source list
source.tex 180 1531 LaTeX version of source
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Byte-by-byte Description of file: source
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Bytes Format Units Label Explanations
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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
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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
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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.
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(End) Patricia Bauer [CDS] 01-Jul-1994