A study of ten quasars with redshifts greater than four

Donald P. Schneider; Maarten Schmidt; James E. Gunn

doi:10.1086/115234

A study of ten quasars with redshifts greater than four

Donald P. Schneider, Maarten Schmidt, James E. Gunn

Research output: Contribution to journal › Article › peer-review

Abstract

Four quasars with redshifts greater than four were detected in a low-resolution CCD grism survey. CCD photometry and high S/N, moderate resolution spectra are presented for these quasars and the six other known quasars with redshifts above 4. The MB values of nine of the objects are between -27.5 and -25, with the tenth quasar having an MB value of -29. The emission lines and shapes of the continua of these ten quasars are similar to those of lower-redshift quasars. The results suggest that the C IV emission lines in high-redshift quasars may be weaker than those in lower-redshift quasars. The continua of all of the high-redshift quasars display strong depressions blueward of the Ly-alpha emission line.

Original language	English (US)
Pages (from-to)	1507-1522
Journal	Astronomical Journal
Volume	98
DOIs	https://doi.org/10.1086/115234
State	Published - Nov 1 1989
Externally published	Yes

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10.1086/115234

http://adsabs.harvard.edu/abs/1989AJ.....98.1507S

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title = "A study of ten quasars with redshifts greater than four",

abstract = "Four quasars with redshifts greater than four were detected in a low-resolution CCD grism survey. CCD photometry and high S/N, moderate resolution spectra are presented for these quasars and the six other known quasars with redshifts above 4. The MB values of nine of the objects are between -27.5 and -25, with the tenth quasar having an MB value of -29. The emission lines and shapes of the continua of these ten quasars are similar to those of lower-redshift quasars. The results suggest that the C IV emission lines in high-redshift quasars may be weaker than those in lower-redshift quasars. The continua of all of the high-redshift quasars display strong depressions blueward of the Ly-alpha emission line.",

author = "Schneider, {Donald P.} and Maarten Schmidt and Gunn, {James E.}",

year = "1989",

month = nov,

day = "1",

doi = "10.1086/115234",

language = "English (US)",

volume = "98",

pages = "1507--1522",

journal = "Astronomical Journal",

issn = "0004-6256",

publisher = "American Astronomical Society",

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TY - JOUR

T1 - A study of ten quasars with redshifts greater than four

AU - Schneider, Donald P.

AU - Schmidt, Maarten

AU - Gunn, James E.

PY - 1989/11/1

Y1 - 1989/11/1

N2 - Four quasars with redshifts greater than four were detected in a low-resolution CCD grism survey. CCD photometry and high S/N, moderate resolution spectra are presented for these quasars and the six other known quasars with redshifts above 4. The MB values of nine of the objects are between -27.5 and -25, with the tenth quasar having an MB value of -29. The emission lines and shapes of the continua of these ten quasars are similar to those of lower-redshift quasars. The results suggest that the C IV emission lines in high-redshift quasars may be weaker than those in lower-redshift quasars. The continua of all of the high-redshift quasars display strong depressions blueward of the Ly-alpha emission line.

AB - Four quasars with redshifts greater than four were detected in a low-resolution CCD grism survey. CCD photometry and high S/N, moderate resolution spectra are presented for these quasars and the six other known quasars with redshifts above 4. The MB values of nine of the objects are between -27.5 and -25, with the tenth quasar having an MB value of -29. The emission lines and shapes of the continua of these ten quasars are similar to those of lower-redshift quasars. The results suggest that the C IV emission lines in high-redshift quasars may be weaker than those in lower-redshift quasars. The continua of all of the high-redshift quasars display strong depressions blueward of the Ly-alpha emission line.

U2 - 10.1086/115234

DO - 10.1086/115234

M3 - Article

SN - 0004-6256

VL - 98

SP - 1507

EP - 1522

JO - Astronomical Journal

JF - Astronomical Journal

ER -

A study of ten quasars with redshifts greater than four

Abstract

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