The systemic redshift of the quasar 1331 + 170

Carswell, R. F.; Mountain, C. M.; Robertson, David J.; Beard, S. M.; Glendinning, A. R.; Laird, David C.; Lawrence, L. C.; Montgomery, D.; Pentland, G.; Pickup, D. A.; Smith, I. A.; Bailey, Jeremy; Bridger, Alan; Casali, M.; Geballe, T. R.; Puxley, P. J.; Smith, M. G.; Wright, Gillian; Ramsay, Suzanne; Baker, A. C.; Espey, B. R.; Ward, M. J.

doi:10.1086/186183

Cited by 21 publications

(11 citation statements)

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“…We note that a radio-loud high-z (z = 2.09) quasar 1331+170 also appears to lie within the locus of values found for the low-z radio-loud quasars (i.e., 1331+170 appears to have "quite weak" optical Fe II emission and EW ([O III] λ4959 + λ5007)/EW (Hβ) ∼ 0.7(Carswell et al 1991).…”

supporting

confidence: 74%

“…All the emission lines are assumed to have the same redshift. Since it is known that high-ionization broad lines (e.g., C IV λ1549) are often blueshifted with respect to low-ionization lines (Gaskell 1982;Wilkes 1984;Carswell et al 1991;Nishihara et al 1997 and references therein), we use only low ionization lines in our analysis.…”

Section: The Rest-frame Optical Emission-line Properties Of S4 0636+68mentioning

confidence: 99%

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Near-Infrared Spectroscopy of the High-Redshift Quasar S4 0636+68 at [CLC][ITAL]z[/ITAL][/CLC] = 3.2

Murayama

Taniguchi

Evans

et al. 1998

The Astronomical Journal

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supporting

confidence: 74%

Section: The Rest-frame Optical Emission-line Properties Of S4 0636+68mentioning

confidence: 99%

Near-Infrared Spectroscopy of the High-Redshift Quasar S4 0636+68 at [CLC][ITAL]z[/ITAL][/CLC] = 3.2

Murayama

Taniguchi

Evans

et al. 1998

The Astronomical Journal

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“…Since restframe ultraviolet emission lines of quasars can be significantly blueshifted with respect to the systemic velocity (e.g., Carswell et al 1991), we also attempted to obtain additional redshift information using restframe optical lines. 3727 Å line which is redshifted to the blue edge of the H-band window, a region strongly affected by atmospheric absorption lines.…”

Section: Near-infrared Spectroscopymentioning

confidence: 99%

A submillimetre selected quasar in the field of Abell 478

Knudsen

Werf

Jaffe

2003

A&A

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Abstract. We present the discovery of a dusty quasar, SMM J04135+10277, located behind the galaxy cluster Abell 478. The quasar was discovered as the brightest source in a submillimetre survey of high redshift galaxies lensed by foreground rich clusters of galaxies in a project aimed at studying the cosmic star formation history of dusty galaxies. With submillimetre fluxes of S 850 = 25 ± 2.8 mJy and S 450 = 55 ± 17 mJy this object is one of the brightest submillimetre sources known. Optical imaging revealed a point source with I = 19.4 ± 0.1 mag (corrected for galactic extinction). Follow-up optical spectroscopy showed this object to be a quasar at redshift z = 2.837 ± 0.003. The quasar was also detected at shorter infrared wavelengths with the Infrared Space Observatory. This object is the first quasar discovered by its submillimetre emission. Given the general lack of overlap between deep submillimetre and X-ray samples, usually interpreted as a low incidence of active nuclei in submillimetre samples, this is an unusual object. Analysis of number counts of quasars and of submillimetre galaxies bears out this suggestion. We compare the properties of SMM J04135+10277 to those of optically selected quasars with submillimetre emission, and argue that the optical faintness results from a large viewing angle with the direction of relativistic beaming, and not from abnormally high extinction. We also find indications that the bulk of the submillimetre flux density is not powered by the quasar nucleus. This conclusion is supported by analysis of the infrared spectral energy distribution. These results are consistent with previous observations that quasars at higher redshift tend to have a more prominent cold dust component, most likely powered by extended star formation in the host galaxy. The temperature for the cold dust component is found be T = 29 ± 2 K when assuming β = 1.5 for a modified blackbody. The quasar is found to have a total infrared luminosity of (2.9 ± 0.5) × 10 13 L , dominated by the emission from cool dust.

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“…There are uncertainties in the systemic redshift of the QSOs in that redshifts determined from high and low ionization lines have been shown to exhibit velocity differences up to 2000 km s −1 (e.g. Espey et al 1989;Steidel & Sargent 1991;Carswell et al 1991;Tytler & Fan 1992), where the velocity difference, ∆v, is defined as…”

Section: Emission Line Velocity Shiftsmentioning

confidence: 99%

APM Z >=4 QSO Survey: Spectra and Intervening Absorption Systems

Storrie-Lombardi¹,

McMahon²,

Irwin³

et al. 1996

ApJ

121

128

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The APM multicolor survey for bright z > 4 objects, covering 2500 deg 2 of sky to m r ∼ 19, resulted in the discovery of thirty-one quasars with z > ∼ 4. High signalto-noise optical spectrophotometry at 5Å resolution has been obtained for the twentyeight quasars easily accessible from the northern hemisphere. These spectra have been surveyed to create new samples of high redshift Lyman-limit systems, damped Lyman-α absorbers, and metal absorption systems (e.g. CIV and MgII). In this paper we present the spectra, together with line lists of the detected absorption systems. The QSOs display a wide variety of emission and absorption line characteristics, with 5 exhibiting broad absorption lines and one with extremely strong emission lines (BR2248−1242). Eleven candidate damped Lyα absorption systems have been identified covering the redshift range 2.8 ≤ z ≤ 4.4 (8 with z > 3.5). An analysis of the measured redshifts of the high ionization emission lines with the low ionization lines shows them to be blueshifted by 430 ± 60 km s −1 . In a previous paper we discussed the redshift evolution of the Lyman limit systems catalogued here. In subsequent papers we will discuss the properties of the Lyα forest absorbers and the redshift and column density evolution of the damped Lyα absorbers.

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The systemic redshift of the quasar 1331 + 170

Cited by 21 publications

References 0 publications

Near-Infrared Spectroscopy of the High-Redshift Quasar S4 0636+68 at [CLC][ITAL]z[/ITAL][/CLC] = 3.2

Near-Infrared Spectroscopy of the High-Redshift Quasar S4 0636+68 at [CLC][ITAL]z[/ITAL][/CLC] = 3.2

A submillimetre selected quasar in the field of Abell 478

APM Z >=4 QSO Survey: Spectra and Intervening Absorption Systems

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