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Hubble Space Telescope Pre-Perihelion ACS/WFC Imaging Polarimetry of Comet ISON (C/2012 S1) at 3.81 AU
Dean C. Hines, Gorden Videen, Evgenij Zubko +9
We present polarization images of Comet ISON (C/2012 S1) taken with the Hubble Space Telescope (HST) on UTC 2013 May 8 (rh = 3.81 AU, Delta = 4.34 AU), when the phase angle was alp…
Aligned grains and inferred toroidal magnetic fields in the envelopes of massive young stellar objects
Janet P. Simpson, Barbara A. Whitney, Dean C. Hines +6
Massive young stellar objects (YSOs), like low-mass YSOs, are thought to be surrounded by optically thick envelopes and/or discs and are observed to have associated regions that pr…
Mid-infrared Spectral Properties of Post-Starburst Quasars
Peng Wei, Zhaohui Shang, Michael S. Brotherton +5
We present Spitzer InfraRed Spectrograph (IRS) low-resolution spectra of 16 spectroscopically selected post-starburst quasars (PSQs) at z ~ 0.3. The optical spectra of these broad-…
The Ionized Absorber and Nuclear Environment of IRAS 13349+2438: Multi-wavelength insights from coordinated Chandra HETGS, HST STIS, HET, and Spitzer IRS
Julia C. Lee, Gerard Kriss, Susmita Chakravorty +6
We present results from a coordinated IR-to-X-ray spectral campaign of the QSO IRAS 13349+2438. Optical spectra reveal extreme Eigenvector-1 characteristics, but the H-beta line wi…