An atlas of Hubble Space Telescope photometric, spectrophotometric, and polarimetric calibration objects

Turnshek, David A.; Bohlin, R. C.; Williamson, Robert L.; Lupie, O. L.; Koornneef, J.; Morgan, D. H.

doi:10.1086/115413

Cited by 238 publications

(215 citation statements)

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“…Observations of unpolarized standard stars on all polarimetry nights showed a flat, well-behaved polarization response over the observed wavelength range. Similarly, observations of polarized standard stars yielded polarizations which agreed well with catalogued values (Turnshek et al 1990). Comparison of the position angle (P.A.)…”

Section: Observations and Reductionssupporting

confidence: 79%

The Dual‐Axis Circumstellar Environment of the Type IIn Supernova 1997eg

Hoffman

Leonard

Chornock

et al. 2008

Astrophysical Journal

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We present multi-epoch spectral and spectropolarimetric observations of the Type IIn supernova (SN ) 1997eg that indicate the presence of a flattened disklike concentration of circumstellar material surrounding aspherical ejecta, with which the disk is misaligned. The polarization across the broad H , H , and He i k5876 lines of SN 1997eg forms closed loops when viewed in the Stokes q-u plane. Such loops occur when the geometrical symmetry of one or both of the Stokes parameters across spectral lines is broken, in this case most likely by occultation of the ejecta by the equatorial circumstellar matter concentration. The polarization of the narrow Balmer lines possesses an intrinsic axis that differs by 12 from that of the elongated ejecta and probably indicates the orientation of the disklike circumstellar material. The existence of two different axes of symmetry in SN 1997eg suggests that neither rotation of the progenitor nor the influence of a companion star can be the sole mechanism creating a preferred axis within the supernova system. Our model supports the emerging hypothesis that the progenitors of some Type IIn supernovae are luminous blue variable stars, whose presupernova mass eruptions form the circumstellar shells that physically characterize the SN IIn subclass. These conclusions, which are independent of interstellar polarization effects, would have been unobservable with only a single epoch of spectropolarimetry.

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Section: Observations and Reductionssupporting

confidence: 79%

The Dual‐Axis Circumstellar Environment of the Type IIn Supernova 1997eg

Hoffman

Leonard

Chornock

et al. 2008

Astrophysical Journal

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“…These observations were repeated several times during our observing run. Hilt 652 was observed during the setup A&A 520, L7 (2010) Fossati et al (2007); (b) Turnshek et al (1990). Berriman et al (1990); (c) Hutsemékers et al (1998); (d) Visvanathan & Wills (1998); (e) Schmidt & Hines (1999); ( f ) Lamy & Hutsemékers (2000); (g) Sluse et al (2005).…”

Section: Observations and Data Reductionmentioning

confidence: 94%

Optical circular polarization in quasars

Hutsemékers

Borguet

Sluse

et al. 2010

A&A

127

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We present new optical circular polarization measurements with typical uncertainties <0.1% for a sample of 21 quasars. All but two objects have null circular polarization. We use this result to constrain the polarization due to photon-pseudoscalar mixing along the line of sight. We detect significant (>3σ) circular polarization in two blazars with high linear polarization and discuss the implications of this result for quasar physics. In particular, the recorded polarization degrees may be indicative of magnetic fields as strong as 1 kG or a significant contribution of inverse Compton scattering to the optical continuum.

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“…Additionally, error frames are calculated in the assumption that the statistics is Poissonian for the quanta detected by the CCD. Spectral standard star LDS749B observed the same night in a 1 annular aperture is a standard from the list given by Turnshek et al (1990). 4 × 4 binning was used to reduce the readout noise.…”

Section: Long-slit Data Reductionmentioning

confidence: 99%

The Eastern filament of W50

Abolmasov¹,

Maryeva²,

Burenkov³

2010

Astron Nachr

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The dates of receipt and acceptance should be inserted later Key words ISM: individual (W50) -ISM: kinematics and dynamics -stars: individuals (SS433)We present new spectral (FPI and long-slit) data on the Eastern optical filament of the well known radionebula W50 associated with SS433. We find that on sub-parsec scales different emission lines are emitted by different regions with evidently different physical conditions. Kinematical properties of the ionized gas show evidence for moderately high (V ∼ 100 km s −1 ) supersonic motions. [O III]λ5007 emission is found to be multi-component and differs from lowerexcitation [S II]λ6717 line both in spatial and kinematical properties. Indirect evidence for very low characteristic densities of the gas (n ∼ 0.1 cm −3 ) is found. We propose radiative (possibly incomplete) shock waves in low-density, moderately high metallicity gas as the most probable candidate for the power source of the optical filament. Apparent nitrogen overabundance is better understood if the location of W50 in the Galaxy is taken into account.

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An atlas of Hubble Space Telescope photometric, spectrophotometric, and polarimetric calibration objects

Cited by 238 publications

References 0 publications

The Dual‐Axis Circumstellar Environment of the Type IIn Supernova 1997eg

The Dual‐Axis Circumstellar Environment of the Type IIn Supernova 1997eg

Optical circular polarization in quasars

The Eastern filament of W50

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