High-redshift QSOs in the FIRST survey

C. R. Benn; M. Vigotti; M. Pedani; J. Holt; K. H. Mack; R. Curran; S. F. Sánchez

doi:10.1046/j.1365-8711.2002.04955.x

High-redshift QSOs in the FIRST survey

C. R. Benn, M. Vigotti, M. Pedani, J. Holt, K. H. Mack, R. Curran, S. F. Sánchez

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Abstract

In a pilot search for high-redshift radio quasi-stellar objects (QSOs), we have obtained spectra of 55 FIRST sources (S1.4GHz > 1 mJy) with very red (O - E > 3) starlike optical identifications. 10 of the candidates are QSOs with redshifts 3.6 <z <4.4 (four were previously known), six with z > 4. The remaining 45 candidates comprise: one z = 2.6 broad-absorption-line (BAL) QSO; three low-redshift galaxies with narrow emission lines; 18 probable radio galaxies; and 23 M stars (mainly misidentifications). The success rate (high-redshift QSOs / spectroscopically-observed candidates) for this search is 1/2 for S1.4GHz > 10 mJy, and 1/9 for S1.4GHz > 1 mJy. With an effective search area of 4030deg2, the surface density of high-redshift (z > 4) QSOs discovered with this technique is 0.0015 deg-2.

Original language	English
Pages (from-to)	221-226
Number of pages	6
Journal	Monthly Notices of the Royal Astronomical Society
Volume	329
Issue number	1
DOIs	https://doi.org/10.1046/j.1365-8711.2002.04955.x
Publication status	Published - 1 Jan 2002

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title = "High-redshift QSOs in the FIRST survey",

abstract = "In a pilot search for high-redshift radio quasi-stellar objects (QSOs), we have obtained spectra of 55 FIRST sources (S1.4GHz > 1 mJy) with very red (O - E > 3) starlike optical identifications. 10 of the candidates are QSOs with redshifts 3.6 4. The remaining 45 candidates comprise: one z = 2.6 broad-absorption-line (BAL) QSO; three low-redshift galaxies with narrow emission lines; 18 probable radio galaxies; and 23 M stars (mainly misidentifications). The success rate (high-redshift QSOs / spectroscopically-observed candidates) for this search is 1/2 for S1.4GHz > 10 mJy, and 1/9 for S1.4GHz > 1 mJy. With an effective search area of 4030deg2, the surface density of high-redshift (z > 4) QSOs discovered with this technique is 0.0015 deg-2.",

keywords = "Early Universe, Quasars: emission lines, Quasars: general, Radio continuum: galaxies",

author = "Benn, {C. R.} and M. Vigotti and M. Pedani and J. Holt and Mack, {K. H.} and R. Curran and S{\'a}nchez, {S. F.}",

year = "2002",

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doi = "10.1046/j.1365-8711.2002.04955.x",

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TY - JOUR

T1 - High-redshift QSOs in the FIRST survey

AU - Benn, C. R.

AU - Vigotti, M.

AU - Pedani, M.

AU - Holt, J.

AU - Mack, K. H.

AU - Curran, R.

AU - Sánchez, S. F.

PY - 2002/1/1

Y1 - 2002/1/1

N2 - In a pilot search for high-redshift radio quasi-stellar objects (QSOs), we have obtained spectra of 55 FIRST sources (S1.4GHz > 1 mJy) with very red (O - E > 3) starlike optical identifications. 10 of the candidates are QSOs with redshifts 3.6 4. The remaining 45 candidates comprise: one z = 2.6 broad-absorption-line (BAL) QSO; three low-redshift galaxies with narrow emission lines; 18 probable radio galaxies; and 23 M stars (mainly misidentifications). The success rate (high-redshift QSOs / spectroscopically-observed candidates) for this search is 1/2 for S1.4GHz > 10 mJy, and 1/9 for S1.4GHz > 1 mJy. With an effective search area of 4030deg2, the surface density of high-redshift (z > 4) QSOs discovered with this technique is 0.0015 deg-2.

AB - In a pilot search for high-redshift radio quasi-stellar objects (QSOs), we have obtained spectra of 55 FIRST sources (S1.4GHz > 1 mJy) with very red (O - E > 3) starlike optical identifications. 10 of the candidates are QSOs with redshifts 3.6 4. The remaining 45 candidates comprise: one z = 2.6 broad-absorption-line (BAL) QSO; three low-redshift galaxies with narrow emission lines; 18 probable radio galaxies; and 23 M stars (mainly misidentifications). The success rate (high-redshift QSOs / spectroscopically-observed candidates) for this search is 1/2 for S1.4GHz > 10 mJy, and 1/9 for S1.4GHz > 1 mJy. With an effective search area of 4030deg2, the surface density of high-redshift (z > 4) QSOs discovered with this technique is 0.0015 deg-2.

KW - Early Universe

KW - Quasars: emission lines

KW - Quasars: general

KW - Radio continuum: galaxies

U2 - 10.1046/j.1365-8711.2002.04955.x

DO - 10.1046/j.1365-8711.2002.04955.x

M3 - Article

SN - 0035-8711

VL - 329

SP - 221

EP - 226

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

High-redshift QSOs in the FIRST survey

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