Redshifts of southern radio sources. VII

White, Graeme L.; Jauncey, D. L.; Wright, A. E.; Batty, M; Savage, A.; Peterson, Bruce A.; Gulkis, S.

doi:10.1086/166216

Cited by 56 publications

(31 citation statements)

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“…From the minimum EW min we derive z > 0:17. 2012À017: Consistent with previous observations of this radio-selected BL Lac (White et al 1988;Véron et al 1990;Falomo et al 1994), our S/ N ¼ 130 VLT spectrum is also featureless. The optical spectral index is ¼ 0:49, in marginal agreement with ¼ 0:33 AE 0:12 reported by Falomo et al (1994).…”

Section: Notes On Individual Objectssupporting

confidence: 92%

ESO Very Large Telescope Optical Spectroscopy of BL Lacertae Objects. II. New Redshifts, Featureless Objects, and Classification Assessments

et al. 2006

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We report on ESO Very Large Telescope optical spectroscopy of 42 BL Lacertae objects of unknown redshift. Nuclear emission lines were observed in 12 objects, while for another six we detected absorption features due to the host galaxy. The new high signal-to-noise ratio spectra therefore allow us to measure the redshift of 18 sources. Five of the observed objects were reclassified as either stars or quasars, and one is of uncertain nature. For the remaining 18 the optical spectra appear without intrinsic features in spite of our ability to measure rather faint (equivalent width $0.1 8) spectral lines. For the latter sources a lower limit to the redshift was set, exploiting the very fact that the absorption lines of the host galaxy are undetected in the observed spectra.

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Section: Notes On Individual Objectssupporting

confidence: 92%

ESO Very Large Telescope Optical Spectroscopy of BL Lacertae Objects. II. New Redshifts, Featureless Objects, and Classification Assessments

et al. 2006

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“…a 15th magnitude BL Lac object of unknown redshift (White et al 1988). It is amongst the most compact, submilliarcsecond, radio sources known based on space VLBI observations at 2.3 GHz (Linfield et al 1989) and 5 GHz (Hirabayashi et al 2000).…”

Section: Figurementioning

confidence: 99%

Variability in GPS Sources

Jauncey

King

Bignall

et al. 2003

Publ. – Astron. Soc. Aust

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Flux density monitoring data at 2.3 and 8.4 GHz is presented for a sample of 33 southern hemisphere GPS sources, drawn from the 2.7 GHz Parkes survey. This monitoring data, together with VLBI monitoring data, shows that a small fraction of these sources, ∼10%, vary. Their variability falls into several categories: sources whose spectral classification is, at best, ephemeral on a timescale of years; sources with a stable GPS classification that vary, but retain their classification; and a small number of sources that exhibit interstellar scintillation, but that maintain a mean GPS spectrum. Existing data on GPS sources with higher frequency peaks, ≥3 GHz, reveals that many such sources vary. However, the majority of these sources possess a GPS spectrum only during outbursts, and hence should perhaps be classified as ephemeral GPS sources. In addition, significant levels of circular polarisation have been found in a number of GPS sources, both amongst the variables and non-variables. Remarkable amongst these is PKS 1519−273, which possesses strong and variable circular polarisation, and which exhibits IDV in all Stokes parameters.

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“…Uncertainties in Ñux calibration and sky subtraction longward of 9000 a †ect the relative strength of Mg II, A which may also show absorption. Wilkes et al 1983, Wilkes 1986(8) Jauncey et al 1978 ;(9) Wright et al 1983 ; (10) Chu et al 1986 ;(11) Wall & Shaver 1993, private communication ;(12) White et al 1988 ;(13) Wright et al 1979 ;(14) Boisson et al 1994 ;(15) Savage et al 1976 ;(16) Dekker & DÏOdorico 1984 ;(17) Blades et al 1980 ;(18) Murdoch et al 1984 ;(19) Dunlop et al 1989 ;(20) OÏDea et al 1991. FIG.…”

Section: The Spectramentioning

confidence: 99%

The Molonglo Reference Catalog 1 Jy Radio Source Survey. IV. Optical Spectroscopy of a Complete Quasar Sample

Baker¹,

Hunstead²,

Kapahi³

et al. 1999

ASTROPHYS J SUPPL S

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Optical spectroscopic data are presented here for quasars from the Molonglo Quasar Sample (MQS), which forms part of a complete survey of 1 Jy radio sources from the Molonglo Reference Catalog. The combination of low-frequency selection and complete identiÐcations means that the MQS is relatively free from the orientation biases that a †ect most other quasar samples. To date, the sample includes 105 quasars and six BL Lac objects, 106 of which have now been conÐrmed spectroscopically. This paper presents a homogenous set of low-resolution optical spectra for 79 MQS quasars, the majority of which have been obtained at the Anglo-Australian Telescope. Full observational details are given and redshifts, continuum, and emission-line data tabulated for all conÐrmed quasars.

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Redshifts of southern radio sources. VII

Cited by 56 publications

References 0 publications

ESO Very Large Telescope Optical Spectroscopy of BL Lacertae Objects. II. New Redshifts, Featureless Objects, and Classification Assessments

ESO Very Large Telescope Optical Spectroscopy of BL Lacertae Objects. II. New Redshifts, Featureless Objects, and Classification Assessments

Variability in GPS Sources

The Molonglo Reference Catalog 1 Jy Radio Source Survey. IV. Optical Spectroscopy of a Complete Quasar Sample

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