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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