Imaging and spectroscopy of ultrasteep spectrum radio sources

Carlos G. Bornancini, Carlos De Breuck, Wim De Vries, Steve Croft, Wil Van Breugel, Huub Röttgering, Dante Minniti

Resultado de la investigación: Article

18 Citas (Scopus)

Resumen

We present a sample of 40 ultrasteep spectrum (USS;) radio sources selected from the Westerbork in the Southern Hemisphere (WISH) catalogue. The USS sources have been imaged in K band at the Cerro Tololo Inter-American Observatory (CTIO) and with the Very Large Telescope (VLT) at Cerro Paranal. We also present VLT, Keck and William Herschel Telescope (WHT) optical spectroscopy of 14 targets selection from four different USS samples. For 12 sources, we have been able to determine the redshifts, including four new radio galaxies at. We find that most of our USS sources have predominantly small (<6 arcsec) radio sizes and faint magnitudes. The mean K-band counterpart magnitude is. The expected redshift distribution estimated using the Hubble K-z diagram has a mean of, which is higher than the predicted redshift obtained for the Sydney University Molonglo Sky Survey-NRAO VLA Sky Survey (SUMSS-NVSS) sample and the expected redshift obtained in the 6C** survey. The compact USS sample analysed here may contain a higher fraction of galaxies which are high redshift and/or are heavily obscured by dust. Using the 74, 352 and 1400 MHz flux densities of a subsample, we construct a radio colour-colour diagram. We find that all but one of our USS sources have a strong tendency to flatten below 352 MHz. We also find that the highest redshift source from this paper (at) does not show evidence for spectral flattening down to 151 MHz. This suggests that very low frequency selected USS samples will likely be more efficient to find high redshift galaxies.

Idioma originalEnglish
Páginas (desde-hasta)551-562
Número de páginas12
PublicaciónMonthly Notices of the Royal Astronomical Society
Volumen378
N.º2
DOI
EstadoPublished - jun 2007

Huella dactilar

spectroscopy
radio
telescopes
extremely high frequencies
diagram
galaxies
color-color diagram
very low frequencies
Southern Hemisphere
radio galaxies
flattening
observatory
catalogs
dust
observatories
tendencies
flux density
diagrams

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Citar esto

Bornancini, C. G., De Breuck, C., De Vries, W., Croft, S., Van Breugel, W., Röttgering, H., & Minniti, D. (2007). Imaging and spectroscopy of ultrasteep spectrum radio sources. Monthly Notices of the Royal Astronomical Society, 378(2), 551-562. https://doi.org/10.1111/j.1365-2966.2007.11769.x
Bornancini, Carlos G. ; De Breuck, Carlos ; De Vries, Wim ; Croft, Steve ; Van Breugel, Wil ; Röttgering, Huub ; Minniti, Dante. / Imaging and spectroscopy of ultrasteep spectrum radio sources. En: Monthly Notices of the Royal Astronomical Society. 2007 ; Vol. 378, N.º 2. pp. 551-562.
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title = "Imaging and spectroscopy of ultrasteep spectrum radio sources",
abstract = "We present a sample of 40 ultrasteep spectrum (USS;) radio sources selected from the Westerbork in the Southern Hemisphere (WISH) catalogue. The USS sources have been imaged in K band at the Cerro Tololo Inter-American Observatory (CTIO) and with the Very Large Telescope (VLT) at Cerro Paranal. We also present VLT, Keck and William Herschel Telescope (WHT) optical spectroscopy of 14 targets selection from four different USS samples. For 12 sources, we have been able to determine the redshifts, including four new radio galaxies at. We find that most of our USS sources have predominantly small (<6 arcsec) radio sizes and faint magnitudes. The mean K-band counterpart magnitude is. The expected redshift distribution estimated using the Hubble K-z diagram has a mean of, which is higher than the predicted redshift obtained for the Sydney University Molonglo Sky Survey-NRAO VLA Sky Survey (SUMSS-NVSS) sample and the expected redshift obtained in the 6C** survey. The compact USS sample analysed here may contain a higher fraction of galaxies which are high redshift and/or are heavily obscured by dust. Using the 74, 352 and 1400 MHz flux densities of a subsample, we construct a radio colour-colour diagram. We find that all but one of our USS sources have a strong tendency to flatten below 352 MHz. We also find that the highest redshift source from this paper (at) does not show evidence for spectral flattening down to 151 MHz. This suggests that very low frequency selected USS samples will likely be more efficient to find high redshift galaxies.",
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Bornancini, CG, De Breuck, C, De Vries, W, Croft, S, Van Breugel, W, Röttgering, H & Minniti, D 2007, 'Imaging and spectroscopy of ultrasteep spectrum radio sources', Monthly Notices of the Royal Astronomical Society, vol. 378, n.º 2, pp. 551-562. https://doi.org/10.1111/j.1365-2966.2007.11769.x

Imaging and spectroscopy of ultrasteep spectrum radio sources. / Bornancini, Carlos G.; De Breuck, Carlos; De Vries, Wim; Croft, Steve; Van Breugel, Wil; Röttgering, Huub; Minniti, Dante.

En: Monthly Notices of the Royal Astronomical Society, Vol. 378, N.º 2, 06.2007, p. 551-562.

Resultado de la investigación: Article

TY - JOUR

T1 - Imaging and spectroscopy of ultrasteep spectrum radio sources

AU - Bornancini, Carlos G.

AU - De Breuck, Carlos

AU - De Vries, Wim

AU - Croft, Steve

AU - Van Breugel, Wil

AU - Röttgering, Huub

AU - Minniti, Dante

PY - 2007/6

Y1 - 2007/6

N2 - We present a sample of 40 ultrasteep spectrum (USS;) radio sources selected from the Westerbork in the Southern Hemisphere (WISH) catalogue. The USS sources have been imaged in K band at the Cerro Tololo Inter-American Observatory (CTIO) and with the Very Large Telescope (VLT) at Cerro Paranal. We also present VLT, Keck and William Herschel Telescope (WHT) optical spectroscopy of 14 targets selection from four different USS samples. For 12 sources, we have been able to determine the redshifts, including four new radio galaxies at. We find that most of our USS sources have predominantly small (<6 arcsec) radio sizes and faint magnitudes. The mean K-band counterpart magnitude is. The expected redshift distribution estimated using the Hubble K-z diagram has a mean of, which is higher than the predicted redshift obtained for the Sydney University Molonglo Sky Survey-NRAO VLA Sky Survey (SUMSS-NVSS) sample and the expected redshift obtained in the 6C** survey. The compact USS sample analysed here may contain a higher fraction of galaxies which are high redshift and/or are heavily obscured by dust. Using the 74, 352 and 1400 MHz flux densities of a subsample, we construct a radio colour-colour diagram. We find that all but one of our USS sources have a strong tendency to flatten below 352 MHz. We also find that the highest redshift source from this paper (at) does not show evidence for spectral flattening down to 151 MHz. This suggests that very low frequency selected USS samples will likely be more efficient to find high redshift galaxies.

AB - We present a sample of 40 ultrasteep spectrum (USS;) radio sources selected from the Westerbork in the Southern Hemisphere (WISH) catalogue. The USS sources have been imaged in K band at the Cerro Tololo Inter-American Observatory (CTIO) and with the Very Large Telescope (VLT) at Cerro Paranal. We also present VLT, Keck and William Herschel Telescope (WHT) optical spectroscopy of 14 targets selection from four different USS samples. For 12 sources, we have been able to determine the redshifts, including four new radio galaxies at. We find that most of our USS sources have predominantly small (<6 arcsec) radio sizes and faint magnitudes. The mean K-band counterpart magnitude is. The expected redshift distribution estimated using the Hubble K-z diagram has a mean of, which is higher than the predicted redshift obtained for the Sydney University Molonglo Sky Survey-NRAO VLA Sky Survey (SUMSS-NVSS) sample and the expected redshift obtained in the 6C** survey. The compact USS sample analysed here may contain a higher fraction of galaxies which are high redshift and/or are heavily obscured by dust. Using the 74, 352 and 1400 MHz flux densities of a subsample, we construct a radio colour-colour diagram. We find that all but one of our USS sources have a strong tendency to flatten below 352 MHz. We also find that the highest redshift source from this paper (at) does not show evidence for spectral flattening down to 151 MHz. This suggests that very low frequency selected USS samples will likely be more efficient to find high redshift galaxies.

KW - Galaxies: high-redshift

KW - Radio continuum: galaxies

KW - Radio continuum: general

KW - Surveys

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Bornancini CG, De Breuck C, De Vries W, Croft S, Van Breugel W, Röttgering H y otros. Imaging and spectroscopy of ultrasteep spectrum radio sources. Monthly Notices of the Royal Astronomical Society. 2007 jun;378(2):551-562. https://doi.org/10.1111/j.1365-2966.2007.11769.x