scholarly journals Using the 6dF Galaxy Redshift Survey to Detect Gravitationally-lensed Quasars

2001 ◽  
Vol 18 (2) ◽  
pp. 195-197 ◽  
Author(s):  
Daniel J. Mortlock ◽  
Michael J. Drinkwater
Keyword(s):  
United Kingdom ◽  
Infrared Spectroscopy ◽  
Near Infrared ◽  
Emission Lines ◽  
Schmidt Telescope ◽  
Galaxy Surveys ◽  
The United Kingdom ◽  
Redshift Survey ◽  
Galaxy Redshift

AbstractIt is possible to detect gravitationally-lensed quasars spectroscopically if the spectra obtained during galaxy surveys are searched for the presence of quasar emission lines. The up-coming 6 degree Field (6dF) redshift survey on the United Kingdom Schmidt Telescope will involve obtaining ~105 spectra of near-infrared selected galaxies to a magnitude limit of K = 13. Applying previously developed techniques implies that at least one lens should be discovered in the 6dF survey, but that as many as ten could be found if quasars typically have BJ – K ~ 8. In this model there could be up to fifty lensed quasars in the sample, but most of them could only be detected by infrared spectroscopy.

The automatic detection of faint quasars from CFHT grens plates

1986 ◽  
Vol 119 ◽  
pp. 55-56
Author(s):  
C.J. Keable ◽  
R.G. Clowes
Keyword(s):  
United Kingdom ◽  
Detection System ◽  
Automatic Detection ◽  
Measuring System ◽  
Schmidt Telescope ◽  
The United Kingdom

The automatic quasar detection system (AQD, see Clowes, 1984) has been used to successfully select quasars from prism plates taken by the United Kingdom Schmidt Telescope. Surveys compiled using this technique have a magnitude limit of B-19.5. We present work here which extends the possible survey limit to B-21. This is done by putting plates taken with the Canada-France-Hawaii Telescope's grens (see Richardson, 1984, for a description) through the AQD measuring system. We will follow this work with a comparable photometric survey of the same field.

scholarly journals Infrared Spectroscopy of Nova V705 Cas

1996 ◽  
Vol 158 ◽  
pp. 325-326
Author(s):  
A. Evans ◽  
T.R. Geballe ◽  
J.M.C. Rawlings ◽  
A.D. Scott
Keyword(s):  
United Kingdom ◽  
Infrared Spectroscopy ◽  
Light Curve ◽  
Ir Spectra ◽  
Dust Shell ◽  
Maximum Light ◽  
Spectroscopic Monitoring ◽  
Infrared Telescope ◽  
The United Kingdom ◽  
Ir Spectroscopic

Nova V705 Cas was discovered on 1993 December 7, several days before maximum light. The light curve indicates that t2 ≃ 40 d (see e.g. [4]), characteristic of dust-forming novae. The light curve went into decline on day 58, indicating the formation of an optically thick dust shell. IR spectra have been obtained regularly since outburst using the cooled grating spectrometer CGS4 on the United Kingdom InfraRed Telescope (UKIRT). We present here the results of ongoing IR spectroscopic monitoring of this nova.

Methane emission detection and flux quantification from exploratory hydraulic fracturing in the United Kingdom, using unmanned aerial vehicle sampling

2020 ◽  
Author(s):  
Adil Shah ◽  
Hugo Ricketts ◽  
Joseph Pitt ◽  
Jacob Shaw ◽  
Khristopher Kabbabe ◽  
...  
Keyword(s):  
United Kingdom ◽  
Unmanned Aerial Vehicle ◽  
Gas Flow ◽  
Near Infrared ◽  
Near Field ◽  
Air Inlet ◽  
The United Kingdom ◽  
Aerial Vehicle ◽  
Flux Quantification ◽  
Intermittent Sampling

<p>Unmanned aerial vehicle (UAV) sampling was used to derive high-precision methane mole fraction measurements downwind of the United Kingdom’s first onshore exploratory operation to horizontally hydraulically fracture shale rock. Sampling took place using two UAVs on five intermittent sampling days between October 2018 and February 2019. One UAV carried an on-board prototype sensor while the other was connected to a sensor on the ground, using a tethered air inlet. Both instruments used near infrared spectroscopy. Methane emissions were observed on one sampling day (14<sup>th</sup> January 2019) over a 1.4-hour sampling window, due to cold venting of methane following a nitrogen lift. The nitrogen lift procedure was used to induce gas flow during liquid unloading. The near-field Gaussian plume inversion flux quantification method was used to derive four instantaneous flux ranges (within uncertainty) from the four UAV flight surveys conducted during the emission window.</p>

scholarly journals Spectral Characteristics of the 2dFGRS–NVSS Galaxies

2000 ◽  
Vol 17 (3) ◽  
pp. 234-240 ◽  
Author(s):  
C. A. Jackson ◽  
D. M. Londish
Keyword(s):  
Spectral Characteristics ◽  
Line Ratio ◽  
Emission Lines ◽  
Sky Survey ◽  
Show Evidence ◽  
Redshift Survey ◽  
Galaxy Redshift ◽  
Narrow Emission

AbstractWe have analysed the 2dF spectra of a sample of galaxies common to the 2dF Galaxy Redshift Survey (2dFGRS, Colless 1999) and the NRAO VLA Sky Survey (NVSS, Condon et al. 1998). Our sample comprises 88 galaxies selected by Sadler et al. (1999) from 30 2dFGRS fields observed in 1998. In this paper we discuss how this and future, much larger, samples of 2dFGRS–NVSS galaxies can be interpreted via analysis of those galaxies with strong narrow emission lines. Using diagnostic line ratio measurements, we confirm the majority of the eyeball classifications of Sadler et al. (1999), although many galaxies show evidence of being ‘composite’ galaxies—mixtures of AGN plus starburst components.

scholarly journals Near-Infrared Spectroscopy of H2 in Proto-Planetary Nebulae

2003 ◽  
Vol 209 ◽  
pp. 269-270
Author(s):  
Douglas M. Kelly ◽  
Bruce J. Hrivnak
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Spectral Range ◽  
Near Infrared ◽  
Planetary Nebulae ◽  
Emission Lines ◽  
Complete Sample

We measured 2.1 – 2.3 μm spectra for a fairly complete sample of known proto-planetary nebulae (PPN) at declinations greater than -30°. This spectral range includes the H2 emission lines 1-0 S(1), 1-0 S(0), 2-1 S(1), 2-1 S(2), and 3-2 S(3). We detected H2 emission from 16 of the 51 nebulae in our survey, including radiatively-excited H2 from several non-bipolar PPN.

The Inverted Alt-Alt Configuration for Optical Telescopes

1974 ◽  
Vol 2 (5) ◽  
pp. 244-247
Author(s):  
E. W. Simmonds
Keyword(s):  
United Kingdom ◽  
Research Council ◽  
Science Research ◽  
Schmidt Telescope ◽  
The United Kingdom ◽  
Optical Telescopes ◽  
Science Research Council ◽  
Design And Construction

IntroductionMy interest in the construction and costs of telescopes began with the design and construction of the building for the 48 inch Schmidt Telescope (on behalf of the Science Research Council of the United Kingdom) and was stimulated by a visit to Mt Palomar and Kitt Peak Observatories. With regard to costs I would like to quote Meinel (1969).

Observations of Flare Stars and T Tauri Stars

1967 ◽  
Vol 1 (1) ◽  
pp. 15-15 ◽  
Author(s):  
Arthur A. Page
Keyword(s):  
United Kingdom ◽  
New Zealand ◽  
Variable Stars ◽  
T Tauri Stars ◽  
Schmidt Telescope ◽  
The United Kingdom ◽  
T Tauri ◽  
Flare Stars ◽  
Photographic Photometry

Photographic observations of Flare Stars in association with Slee, Higgins and Patston, T Association patrols, photographic photometry of selected variable stars in association with Bateson of New Zealand and surveillance of comets brighter than V = 13m, in association with Candy of the United Kingdom constitute the principal fields of research of Page Observatory (private), situated 7 miles North of Brisbane. A recently constructed f2.9 8in/12.5in Schmidt telescope now serves as the main photographic instrument.

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