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Browsing by Author "Hough, J."
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3 MU M Spectropolarimetry of 1120 Ice in Young Stellar Objects
Chrysostomou, A.; Hough, J.; Messinger, D.W.; Whittet, D.C.B.; Aitken, D.; Hoche, P.F. (Astronomical Society of the Pacific, 1996)Spectropolarimetry of the water-ice feature at 3.1um towards a number of YSOs is presented. The data show that excesses of polarization and changes in position angle across the feature are common. The polarization excess ... -
3.4 Micron Feature on the Shoulder of Ice-Band Absorptions in Three Luminous Young Stellar Objects: IRAS 18511 0146, IRAS 21413 5442, and IRAS 04579 4703
Ishii, M.; Nagata, T.; Chrysostomou, A.; Hough, J. (2002-11)An absorption feature at 3.4 lm has been detected in the long-wavelength wing of the 3.1 lm H2O ice feature in three young stellar objects: IRAS 18511+0146, IRAS 21413+5442, and IRAS 04579+4703. The profile of the 3.4 lm ... -
Alignment of atmospheric mineral dust due to electric field
Ulanowski, Z.; Bailey, J. A.; Lucas, P.W.; Hough, J.; Hirst, E. (2007)Optical polarimetry observations on La Palma, Canary Islands, during a Saharan dust episode show dichroic extinction indicating the presence of vertically aligned particles in the atmosphere. Modelling of the extinction ... -
The AM Herculis type binary E1405-451
Bailey, J.; Axon, D.J.; Hough, J.; Watts, D.J.; Giles, A.B.; Greenhill, J.G. (1983)The authors report photometry and polarimetry of the AM Her-type binary E1405-451. For the first time circular polarization has been detected in such an object at wavelengths longer than 1 μm. The light curves and polarization ... -
The appearance of broad H alpha in BL Lacertae
Corbett, E.A.; Robinson, A.; Axon, D.J.; Hough, J.; Jeffries, R.D.; Thurston, M.R.; Young, S. (1996)We present optical spectropolarimetry confirming Vermeulen et al.'s recent discovery of a broad Hα emission line in BL Lacertae. This feature, which is present at about the same strength in spectra taken two days apart, ... -
Astrobiological signatures: prospects for the detection of non-terrestrial biological material
Gledhill, T.; Sparks, W.; Ulanowski, Z.; Hough, J.; DasSarma, S. (2007)The possibilities for detecting non-terrestrial biological material are briefly reviewed in light of the flurry of extrasolar planet detections over the last ten years and the forthcoming space missions designed to search ... -
Axisymmetry in protoplanetary nebulae: using imaging polarimetry to investigate envelope structure
Gledhill, T.; Chrysostomou, A.; Hough, J.; Yates, J.A. (2001-04)We use ground-based imaging polarimetry to detect and image the dusty circumstellar envelopes of a sample of proto-planetary nebulae (PPNe) at near-infrared wavelengths. This technique allows the scattered light from the ... -
Beaming in Radio-Quiet AGN
Young, S.; Hough, J.; Axon, D.J.; Bailey, J. (Astronomical Society of the Pacific, 1997)We have obtained new optical spectropolarimetric data for the radio-quiet Seyfert NGC 1068, taken through apertures on the nucleus and at two positions within the ionization/scattering cone. The equivalent width of scattered ... -
CanariCam-Polarimetry: A Dual-Beam 10 m Polarimeter for the GTC
Packham, C.; Hough, J.; Telesco, C.M. (Astronomical Society of the Pacific, 2005)The advent of large (¸8m) telescopes, along with the new breed of mid-IR instrumentation, has opened a new window to di®raction-limited polarimetry. CanariCam, nearing completion at the University of Florida for the 10m ... -
CanariCam: a multimode mid-infrared camera for the Gran Telescopio CANARIAS
Telesco, C.M.; Ciardi, D.; French, J.; Ftaclas, C.; Hanna, K.T.; Hough, J.; Julian, J.; Kidger, M.; Packham, C.; Pina, R.K.; Varosi, F.; Sellar, R.G. (Int Soc for Optical Engineering, 2003)The University of Florida is developing a mid-infrared camera for the 10.4-meter Gran Telescopio CANARIAS. CanariCam has four science modes and two engineering modes, which use the same 320 x 240-pixel, arsenic-doped ... -
Changes of Accretion SPOT Longitude in Eclipsing Am-Herculis Binaries
Bailey, J.; Wickramasinghe, D.T.; Ferrario, L.; Hough, J.; Cropper, M. (1993) -
Circular Polarimetry and the line of sight to the Becklin-Neugebauer object
Aitken, D.; Hough, J.; Chrysostomou, A. (2006) -
Circular polarimetry reveals helical magnetic fields in the young stellar object HH 135 136
Chrysostomou, A.; Lucas, P.W.; Hough, J. (2007) -
Circular polarisation in star-forming regions : possible implications for homochirality
Hough, J.; Bailey, J.; Chrysostomou, A.; Gledhill, T.; Lucas, P.W.; Tamura, M.; Clark, S.; Yates, J.A.; Menard, F. (2001) -
Circular polarization in scattered light as a possible biomarker
Sparks, W.; Hough, J.; Kolokolova, L.; Germer, T.A.; Chen, F.; DasSarma, S.; DasSarma, P.; Robb, F.T.; Manset, N.; Reid, I.; Macchetto, F.D.; Martin, W. (2009)Biological molecules exhibit homochirality and are optically active. Therefore, it is possible that the scattering of light by biological molecules might result in a macroscopic signature in the form of circular polarization. ... -
Circular Polarization in Star- Formation Regions : Implications for Biomolecular Homochirality
Bailey, J.; Chrysostomou, A.; Hough, J.; Gledhill, T.; McCall, A.; Clark, S.; Menard, F.; Tamura, M. (1998)Strong infrared circular polarization resulting from dust scattering in reflection nebulae in the Orion OMC-1 star-formation region has been observed. Circular polarization at shorter wavelengths might have been important ... -
A circumstellar disk associated with a massive protostellar object
Jiang, Z.; Tamura, M.; Fukagawa, M.; Hough, J.; Lucas, P.W.; Suto, H.; Ishii, M.; Yang, J. (2005) -
Circumstellar structure of RU Lupi down to au scales
Takami, M.; Bailey, J.; Gledhill, T.; Chrysostomou, A.; Hough, J. (2001-05) -
Constraints on the nuclear emission of the Circinus galaxy : optical and near-IR spectropolarimetry
Alexander, D.M.; Heisler, C.A.; Young, S.; Lumsden, C.L.; Hough, J.; Bailey, J. (2000)We present optical and, for the first time, K-band spectropolarimetry of the nuclear region of the Circinus galaxy. In the optical we confirm the previous discovery of polarized broad Hα. We have not detected polarized ... -
Constraints on the nuclear emission of the Circinus galaxy: the torus
Ruiz, M.; Efstathiou, A.; Alexander, D.M.; Hough, J. (2001-08)