scholarly journals Taurus Tunable Filter: A Flexible Approach to Narrowband Imaging

1998 ◽  
Vol 15 (1) ◽  
pp. 44-49 ◽  
Author(s):  
Joss Bland-Hawthorn ◽  
D. Heath Jones
Keyword(s):  
Galactic Plane ◽  
Interference Filter ◽  
Tunable Filter ◽  
Narrowband Interference ◽  
Flexible Approach ◽  
Monochromatic Imaging ◽  
Narrowband Imaging ◽  
William Herschel

AbstractThe Taurus Tunable Filter (TTF) is a tunable narrowband interference filter covering wavelengths from 6300 Å to the sensitivity drop-off of conventional CCDs (∼9600 Å), although a blue ‘arm’ (4000–6500 Å) is to be added by the end of 1997. The TTF offers monochromatic imaging at the Cassegrain foci of both the Anglo-Australian and William Herschel Telescopes, with an adjustable passband of between 6 and 60 Å. In addition, frequency switching with the TTF can be synchronised with movement of charge (charge shuffling) on the CCD, which has important applications to many astrophysical problems. Here we review the different modes of TTF and suggest their use for follow-up narrowband imaging to the AAO/UKST Galactic Plane Hα Survey.

scholarly journals Optical validation and characterization of Planck PSZ1 sources at the Canary Islands observatories

2018 ◽  
Vol 616 ◽  
pp. A42 ◽  
Author(s):  
R. Barrena ◽  
A. Streblyanska ◽  
A. Ferragamo ◽  
J. A. Rubiño-Martín ◽  
A. Aguado-Barahona ◽  
...  
Keyword(s):  
Velocity Dispersion ◽  
Galactic Plane ◽  
Isaac Newton ◽  
Galaxy Distribution ◽  
Optical Images ◽  
Imaging And Spectroscopy ◽  
One Year ◽  
William Herschel

We have identified new clusters and characterized previously unknown Planck Sunyaev–Zeldovich (SZ) sources from the first Planck catalogue of SZ sources (PSZ1). The results presented here correspond to an optical follow-up observational programme developed during approximately one year (2014) at Roque de los Muchachos Observatory, using the 2.5 m Isaac Newton telescope, the 3.5 m Telescopio Nazionale Galileo, the 4.2 m William Herschel telescope and the 10.4 m Gran Telescopio Canarias. We have characterized 115 new PSZ1 sources using deep optical imaging and spectroscopy. We adopted robust criteria in order to consolidate the SZ counterparts by analysing the optical richness, the 2D galaxy distribution, and velocity dispersions of clusters. Confirmed counterparts are considered to be validated if they are rich structures, well aligned with the Planck PSZ1 coordinate and show relatively high velocity dispersion. Following this classification, we confirm 53 clusters, which means that 46% of this PSZ1 subsample has been validated and characterized with this technique. Sixty-two SZ sources (54% of this PSZ1 subset) remain unconfirmed. In addition, we find that the fraction of unconfirmed clusters close to the galactic plane (at |b| < 25°) is greater than that at higher galactic latitudes (|b| > 25°), which indicates contamination produced by radio emission of galactic dust and gas clouds on these SZ detections. In fact, in the majority of the cases, we detect important galactic cirrus in the optical images, mainly in the SZ target located at low galactic latitudes, which supports this hypothesis.

scholarly journals Taurus Tunable Filter — Seven Years of Observing

2003 ◽  
Vol 20 (3) ◽  
pp. 242-251 ◽  
Author(s):  
J. Bland-Hawthorn ◽  
L. Kedziora-Chudczer
Keyword(s):  
Tunable Filters ◽  
Tunable Filter ◽  
To Come ◽  
William Herschel

AbstractThe Taurus Tunable Filter (TTF) has now been in regular use for seven years on the Anglo–Australian Telescope (AAT). The instrument was also used for three years (1996–1999) on the William Herschel Telescope (WHT). We present a brief review of the different applications in order to illustrate the versatility of tunable filters in optical/IR spectrophotometric imaging. Tunable filters are now either planned or under development for 6–10 m class telescopes which ensures their use for years to come.

scholarly journals An Hα Survey of the Galactic Plane

1998 ◽  
Vol 179 ◽  
pp. 179-181
Author(s):  
Q.A. Parker ◽  
S. Phillipps
Keyword(s):  
Galactic Plane ◽  
Narrow Band ◽  
Interference Filter ◽  
Low Noise ◽  
Magellanic Clouds ◽  
Coverage Depth ◽  
Ionized Gas ◽  
Fine Grain ◽  
The Galaxy ◽  
Very High

We describe a major new Anglo-Australian proposal for a U.K. Schmidt Telescope (UKST) Hα survey of the Southern Galactic plane, Magellanic clouds and selected regions. The agreed survey will use a new 12 × 12 inch monolithic Hα interference filter of very high specification in combination with Tech Pan film. Tech Pan offers significant advantages for this work due to an inherent sensitivity at Hα and its extremely fine grain, high resolution, exceptional DQE, excellent imaging and low noise (e.g., Parker et al. 1994). The combination of Tech Pan and a narrow band Hα filter will provide a survey of unprecendented area coverage, depth and resolution, superior to any previous optical survey of ionized gas in the galaxy. It should to lead to exciting new discoveries and avenues of research.

scholarly journals Thousands of Stellar SiO masers in the Galactic center: The Bulge Asymmetries and Dynamic Evolution (BAaDE) survey

2016 ◽  
Vol 11 (S322) ◽  
pp. 103-106 ◽  
Author(s):  
Loránt O. Sjouwerman ◽  
Ylva M. Pihlström ◽  
R. Michael Rich ◽  
Mark R. Morris ◽  
Mark J Claussen
Keyword(s):  
Velocity Structure ◽  
Galactic Center ◽  
Galactic Plane ◽  
Dynamic Evolution ◽  
Stellar Streams ◽  
Red Giant ◽  
Optical Surveys ◽  
Galactic Orbit ◽  
Maser Sources

AbstractA radio survey of red giant SiO sources in the inner Galaxy and bulge is not hindered by extinction. Accurate stellar velocities (<1 km/s) are obtained with minimal observing time (<1 min) per source. Detecting over 20,000 SiO maser sources yields data comparable to optical surveys with the additional strength of a much more thorough coverage of the highly obscured inner Galaxy. Modeling of such a large sample would reveal dynamical structures and minority populations; the velocity structure can be compared to kinematic structures seen in molecular gas, complex orbit structure in the bar, or stellar streams resulting from recently infallen systems. Our Bulge Asymmetries and Dynamic Evolution (BAaDE) survey yields bright SiO masers suitable for follow-up Galactic orbit and parallax determination using VLBI.Here we outline our early VLA observations at 43 GHz in the northern bulge and Galactic plane (0<l°<250), and ALMA observations at 86 GHz in the southern bulge (250<l°<360). We report a preliminary overall 70% detection rate in our color-selected MSX sources.

Referrals to a Psychiatric Service from Old People's Homes

1980 ◽  
Vol 136 (4) ◽  
pp. 396-401 ◽  
Author(s):  
J. L. Margo ◽  
J. R. Robinson ◽  
S. Corea
Keyword(s):  
Psychiatric Service ◽  
Psychiatric Services ◽  
Behavioural Problems ◽  
Flexible Approach ◽  
One Year ◽  
Old People's Homes

SummaryOne hundred consecutive referrals have been surveyed, the diagnostic and behavioural problems leading to referral considered and follow-up information obtained one year later. For most admission to hospital as in- or day-patients was unnecessary. Old people's homes do not make excessive demands on the psychiatric services, but deserve support, including help in developing a more tolerant and flexible approach to less conforming residents. This is becoming imperative now that old people's homes are dealing with increased numbers of disturbed residents.

scholarly journals A UKST Hα Survey of the Galactic Plane

1997 ◽  
Vol 14 (1) ◽  
pp. 123-124 ◽  
Author(s):  
Q. A. Parker ◽  
Q. S. Phillipps
Keyword(s):  
High Resolution ◽  
Galactic Plane ◽  
Interference Filter ◽  
Low Noise ◽  
Magellanic Clouds ◽  
Area Coverage ◽  
Coverage Depth ◽  
Fine Grain ◽  
The Galaxy ◽  
Peak Sensitivity

AbstractWe describe a major Anglo-Australian project to undertake a UKST Ha survey of the Southern Galactic plane, Magellanic clouds and selected regions. The survey will use a new 12 × 12 inch monolithic Hα interference filter of high specification and Tech Pan film which offers significant advantages over other emulsions due to its peak sensitivity at Ha and its extremely fine grain, high resolution, exceptional DQE, excellent imaging and low noise. A survey of unprecedented area coverage, depth and resolution should result, superior to any previous optical survey of ionised gas in the galaxy. It is certain to lead to exciting new discoveries and new avenues of research.

scholarly journals Swift/XRT Deep Galactic Plane Survey Discovery of a New Intermediate Polar Cataclysmic Variable, Swift J183920.1-045350

2021 ◽  
Vol 923 (2) ◽  
pp. 243
Author(s):  
Nicholas M. Gorgone ◽  
Patrick A. Woudt ◽  
David Buckley ◽  
Koji Mukai ◽  
Chryssa Kouveliotou ◽  
...  
Keyword(s):  
Orbital Period ◽  
Galactic Plane ◽  
Emission Lines ◽  
Cataclysmic Variable ◽  
Optical Photometry ◽  
X Ray ◽  
Common Features ◽  
Spin Period ◽  
Long Baseline

Abstract We report on the Swift/XRT Deep Galactic Plane Survey discovery and multiwavelength follow-up observations of a new intermediate polar (IP) cataclysmic variable, Swift J183920.1-045350. A 449.7 s spin period is found in XMM-Newton and NuSTAR data, accompanied by a 459.9 s optical period that is most likely the synodic, or beat period, produced from a 5.6 hr orbital period. The orbital period is seen with moderate significance in independent long-baseline optical photometry observations taken with the ZTF and SAAO telescopes. We find that the X-ray pulse fraction of the source decreases with increasing energy. The X-ray spectra are consistent with the presence of an Fe emission line complex with both local and interstellar absorption. In the optical spectra, strong Hα, H i, He i, and He ii emission lines are observed, all common features in magnetic CVs. The source properties are thus typical of known IPs, with the exception of its estimated distance of 2.26 − 0.83 + 1.93 kpc, which is larger than typical, extending the reach of the CV population in our Galaxy.

scholarly journals A near-infrared survey for galactic Wolf-Rayet stars

2003 ◽  
Vol 212 ◽  
pp. 555-557
Author(s):  
Nicole L. Homeier ◽  
Robert D. Blum ◽  
Peter S. Conti ◽  
Anna Pasquali ◽  
Augusto Damineli
Keyword(s):  
Near Infrared ◽  
Galactic Plane ◽  
Galactic Disk ◽  
Infrared Observations ◽  
Near Ir ◽  
Relative Line ◽  
Set Up ◽  
Infrared Survey

Most of the Milky Way's evolved massive stellar population is hidden from view. We can attempt to remedy this situation with near-infrared observations, and in this paper we present our method for detecting Wolf-Rayet stars in highly extincted regions and apply it to the inner Galaxy. Using narrow-band filters at K-band wavelengths, we demonstrate how WR stars can be detected in regions where they are optically obscured. Candidates are selected for spectroscopic follow-up from our relative line and continuum photometry. The final results of applying this method with a near-IR survey in the Galactic plane will provide a more complete knowledge of the structure of the galactic disk, the role of metallicity in massive stellar evolution, and environments of massive star formation. In this paper we briefly describe the survey set-up and report on recent progress. We have discovered four emission-line objects in the inner Galaxy: two with nebular emission lines, and two new WR stars, both of late WC subtype.

STUDIES ON THE DETERMINATION OF THE TOTAL HARDNESS OF THE DRINKING WATER COMING FROM THE "FÂNTÂNILE RECI" SPRING IN MARAMUREŞ

2020 ◽  
Vol 34 (2) ◽  
pp. 65-73
Author(s):  
Aurica Pop ◽  
Keyword(s):  
Drinking Water ◽  
Optical System ◽  
Interference Filter ◽  
Total Hardness ◽  
Light Sources ◽  
Narrowband Interference ◽  
Led Lights ◽  
Reference Detector ◽  
High Range

The paper showcases research conducted in order to determine the total hardness of the drinking water coming from the "Fântânile Reci" spring, located at the edge of the DN18 road, at the end of the Mara town, in Maramures, Romania. A HI97735 advanced portable photometer was used for this experiment. The photometer can perform low, medium and high range measurements of the total hardness of the water samples. The counter comes equipped with a superior optical system which uses a reference detector and a narrowband interference filter used for extremely quick and repeatable measurements. The values obtained as the result of the experiment are: 204 mg/l CaCO 3 (Total Hardness MR), 15,2 °E, 12,2°dH and 21,7°f. The LED light sources are superior compared to the tungsten lamps. LED lights are more efficient, providing more light while using less energy, and they produce little heat, which could otherwise affect the electrical balance.

The Search for Symbiotic Stars in the IPHAS Survey

2012 ◽  
Vol 21 (1-2) ◽  
Author(s):  
R. L. M. Corradi
Keyword(s):  
Selection Criteria ◽  
Near Infrared ◽  
Galactic Plane ◽  
Symbiotic Stars ◽  
Survey Area

AbstractWe have started a project to search for symbiotic stars using the data from IPHAS, the Hα survey of the Northern Galactic plane. Candidates are selected from the IPHAS photometric catalogue based on their colors, combined with the information in the near-infrared from 2MASS. So far, follow-up spectroscopy allowed us to discover 14 new symbiotic stars, compared to the 10 systems previously known in the IPHAS survey area. Their general characteristics and the most notable cases are briefly presented. the spectroscopic campaign also allowed us to refine the selection criteria for symbiotic stars in IPHAS. Perspectives, which include the extension of the survey in the Southern Galactic plane and a portion of the bulge (VPHAS+), are discussed.

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