Browsing University of Hertfordshire by Title
Now showing items 11436-11455 of 24264
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Infrared and optical polarization of Markarian-421
(1981)Observations of the polarization of Mrk 421 in the V, J, and K bands are presented. The infrared radiation shows variable polarization with a range of at least 2-4%. The spectrum of the nonthermal source in the VJK regions ... -
Infrared dark cloud cores in the SCUBA Legacy Catalogue
(2009)We present an investigation of candidate infrared dark cloud (IRDC) cores as identified by Simon et al. located within the Submillimetre Common User Bolometer Array (SCUBA) Legacy Catalogue. After applying a uniform noise ... -
An infrared desert dust index for the Along-Track Scanning Radiometers
(2012)A new aerosol index for the Along-Track Scanning Radiometers (ATSRs) is presented that provides a means to detect desert dust contamination in infrared SST retrievals. The ATSR Saharan dust index (ASDI) utilises only the ... -
Infrared emission of young HII regions: a Herschel/Hi-GAL study
(2015-07-30)Context. Investigating the relationship between radio and infrared emission of Hii regions may help shed light on the nature of the ionizing stars and the formation mechanism of early-type stars in general. Aims: We have ... -
The infrared jet in 3C 66B
(2000) -
Infrared Mn I laboratory oscillator strengths for the study of late type stars and ultracool dwarfs
(2011)Aims: The aim of our new laboratory measurements is to measure accurate absolute oscillator strengths for neutral manganese transitions in the infrared needed for the study of late-type stars and ultracool dwarfs. Methods: ... -
Infrared Observations of a Mid-L Dwarf with Strong Hα Emission
(2007-04-10)We present Spitzer/IRAC observations of the L5 dwarf, 2MASSI J1315309-264951 (2M 1315). This ultracool dwarf is known to display strong emission in the H alpha line. The spectral energy distribution (SED) for this object ... -
Infrared Photometry of Blazars - 8 Years of Observations
(1994-09-01)We present photometric observations of 16 blazar sources at mid- to near- infrared wavelengths, covering the period 1986 January to 1993 December. We present the data in tabular form and, for selected well-sampled sources, ... -
Infrared photometry of the nuclei of early-type radio galaxies
(1986)The authors have obtained near- and mid-infrared photometry of the nuclei of both strong and weak radio galaxies. The implication of these data are that a relatively small percentage, ≅15 per cent, of radio ellipticals ... -
Infrared Polarimetry and Integral Field Spectroscopy of Post-Asymptotic Giant Branch Stars
(2008-10-20)In this thesis, I present the properties of IRAS 19306+1407 central source and its sur- rounding circumstellar envelope (CSE), from the analysis of near-infrared (near-IR) polarimetry and integral field spectroscopy ... -
Infrared Polarimetry and the Torus
(1997)Polarimetry at near-infrared wavelengths is shown to be an important tool in understanding the properties of the obscuring torus in NGC1068. We present evidence for the existence of aligned grains in the torus, which produce ... -
Infrared polarimetry of dark clouds. II : Magnetic field structure in the Rho Ophiuchi dark cloud
(1988)K-band polarimetry of 20 sources embedded within the densest region of the Rho Oph dark cloud has been obtained. The degree of polarization ranges from 1.1 to 7.4 percent, and the position angles have a bimodal distribution, ... -
Infrared Polarimetry of Interstellar Dust
(2005)Grains in the diffuse interstellar medium, and in at least some parts of dense molecular clouds, are aligned with their short axis preferentially along the direction of the local magnetic field. At longer infrared wavelengths ... -
Infrared polarimetry of the nucleus of Centaurus A - The nearest blazar?
(1986)As one of the nearest examples of an active galaxy, NGC5128 (Centaurus A) has been studied in detail over a wide range of wavelengths. The nucleus of the galaxy is seen clearly in the X-ray, radio and infrared, but is ... -
Infrared polarimetry of the reflection nebula near L 1551 IRS 5
(1986)The K-band polarization has been measured in the region extending 30 arcsec to the SW of L 1551 IRS 5. The degree of polarization is exceptionally high, reaching ≡67 per cent. The large polarizations and the azimuthal ... -
Infrared polarimetry of the southern massive star-forming region G333.6-0.2
(2001)We present 8-13μm spectropolarimetry, and 12- and 2-μm imaging polarimetry of the southern massive star-forming region G333.6−0.2. Spectro-polarimetry measurements show that the polarization observed towards the nebula ... -
Infrared polarization in OMC-1 - Discovery of a molecular hydrogen reflection nebula
(1986)The polarization of the broadband continuum at K has been mapped in the core of the OMC-1 with high spatial resolution, and with lower resolution in a more extensive surrounding area. In addition, the first detailed ...