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Constraints on cosmological birefringence from PLANCK and Bicep2/Keck data
Gruppuso, A.; Mandolesi, N.; Melchiorri, A. +4 more
The polarization of cosmic microwave background (CMB) can be used to constrain cosmological birefringence, the rotation of the linear polarization of CMB photons potentially induced by parity violating physics beyond the standard model. This effect produces non-null CMB cross correlations between temperature and B mode-polarization, and between E-…
Anisotropies in the HI gas distribution toward 3C 196
Kerp, J.; Kalberla, P. M. W.
Context. The local Galactic Hi gas was found to contain cold neutral medium (CNM) filaments that are aligned with polarized dust emission. These filaments appear to be dominated by the magnetic field and in this case turbulence is expected to show distinct anisotropies.
Aims: We use the Galactic Effelsberg-Bonn Hi Survey (EBHIS) to derive 2D …
The Local Black Hole Mass Function Derived from the MBH-P and the MBH-n Relations
Mutlu-Pakdil, Burçin; Davis, Benjamin L.; Seigar, Marc S.
We present a determination of the supermassive black hole (SMBH) mass function for early- and late-type galaxies in the nearby universe (z < 0.0057), established from a volume-limited sample consisting of a statistically complete collection of the brightest spiral galaxies in the southern hemisphere. The sample is defined by limiting luminosity…
The Distance to M104
Dolphin, Andrew E.; Skillman, Evan D.; Berg, Danielle +2 more
M104 (NGC 4594; the Sombrero galaxy) is a nearby, well-studied elliptical galaxy included in scores of surveys focused on understanding the details of galaxy evolution. Despite the importance of observations of M104, a consensus distance has not yet been established. Here, we use newly obtained Hubble Space Telescope optical imaging to measure the…
Constraining AGN Feedback in Massive Ellipticals with South Pole Telescope Measurements of the Thermal Sunyaev-Zel'dovich Effect
Cohen, Seth; Joshi, Bhavin; Scannapieco, Evan +2 more
Energetic feedback due to active galactic nuclei (AGNs) is likely to play an important role in the observed anti-hierarchical trend in the evolution of galaxies, and yet the energy injected into the circumgalactic medium by this process is largely unknown. One promising approach to constrain this feedback is through measurements of spectral distor…
Material transport map of Titan: The fate of dunes
Lorenz, Ralph D.; Turtle, Elizabeth P.; Malaska, Michael J. +3 more
Using SAR data from Cassini's RADAR instrument, we examined the orientations of three terrain units on Titan, bright lineated plains, streak-like plains, and linear dunes. From the overall integrated pattern of their orientation, we were able to determine Titan's global material transport vectors. The analysis indicates that, in both the northern …
Seasonal variability of Saturn's tropospheric temperatures, winds and para-H2 from Cassini far-IR spectroscopy
Fletcher, Leigh N.; Irwin, P. G. J.; Orton, G. S. +2 more
Far-IR 16-1000 µ m spectra of Saturn's hydrogen-helium continuum measured by Cassini's Composite Infrared Spectrometer (CIRS) are inverted to construct a near-continuous record of upper tropospheric (70-700 mbar) temperatures and para-H2 fraction as a function of latitude, pressure and time for a third of a saturnian year (2004-20…
When Shock Waves Collide
Hartigan, P.; Frank, A.; Hansen, E. +10 more
Supersonic outflows from objects as varied as stellar jets, massive stars, and novae often exhibit multiple shock waves that overlap one another. When the intersection angle between two shock waves exceeds a critical value, the system reconfigures its geometry to create a normal shock known as a Mach stem where the shocks meet. Mach stems are impo…
Generation of magnetosonic waves over a continuous spectrum
Lu, Quanming; Gao, Xinliang; Zhima, Zeren +3 more
Magnetosonic waves, also known as equatorial noise emission, were found to have discrete frequency structures, which is consistent with instability caused by proton ring distribution. Nonetheless, nondiscrete structure, i.e., a broadband spectrum over a continuous frequency range, has been reported. We investigate the question whether proton ring …
The UV-Optical Color Gradients in Star-forming Galaxies at 0.5 < z < 1.5: Origins and Link to Galaxy Assembly
Barro, Guillermo; Faber, S. M.; Koo, David C. +10 more
The rest-frame UV-optical (I.e., NUV - B) color index is sensitive to the low-level recent star formation and dust extinction, but it is insensitive to the metallicity. In this Letter, we have measured the rest-frame NUV - B color gradients in ∼1400 large (r e > 0.″18), nearly face-on (b/a > 0.5) main sequence star-forming galaxie…