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Whistler mode waves at magnetotail dipolarization fronts
André, M.; Vaivads, A.; Khotyaintsev, Yu. V. +3 more
We report the statistics of whistler mode waves observed in relation to dipolarization fronts (DFs) in Earth's magnetotail using data from the four Cluster spacecraft spanning a period of 9 years, 2001-2009. We show that whistler mode waves are common in a vicinity of DFs: between 30 and 60% of all DFs are associated with whistlers. Whistlers are …
Constraints on the merging channel of massive galaxies since z ∼ 1
Hernán-Caballero, A.; Cava, A.; Pérez-González, P. G. +8 more
We probe the merging channel of massive galaxies over the z = 0.3-1.3 redshift window by studying close pairs in a sample of 238 galaxies with stellar mass ≳1011 M⊙, from the SHARDS (Survey for High-z Absorption Red and Dead Sources) survey. SHARDS provides medium-band photometry equivalent to low-resolution optical spectra (…
Two estimates of the distance to the Galactic Centre
Francis, Charles; Anderson, Erik
We use recently updated globular cluster distances to estimate the distance to the Galactic Centre, finding 7.4 ± 0.2|stat ± 0.2|sys kpc from symmetry considerations, including a trough at the Galactic Centre and peaks denoting the position of the bar. We recalibrate the red clump magnitude from Hipparcos stars, finding a ske…
The Distribution of Polarized Radio Sources >15 µJy in GOODS-N
Owen, F. N.; Rudnick, L.
We present deep Very Large Array observations of the polarization of radio sources in the GOODS-N field at 1.4 GHz at resolutions of 1.''6 and 10''. At 1.''6, we find that the peak flux cumulative number count distribution is N(> p) ~ 45*(p/30 µJy)-0.6 per square degree above a detection threshold of 14.5 µJy. This repres…
Hubble Space Telescope Grism Spectroscopy of Extreme Starbursts across Cosmic Time: The Role of Dwarf Galaxies in the Star Formation History of the Universe
Martin, Crystal L.; Teplitz, Harry I.; Bunker, Andrew J. +15 more
Near infrared slitless spectroscopy with the Wide Field Camera 3, on board the Hubble Space Telescope, offers a unique opportunity to study low-mass galaxy populations at high redshift (z ~ 1-2). While most high-z surveys are biased toward massive galaxies, we are able to select sources via their emission lines that have very faint continua. We in…
Gas inflows towards the nucleus of the active galaxy NGC 7213
Schnorr-Müller, Allan; Storchi-Bergmann, Thaisa; Nagar, Neil M. +1 more
We present two-dimensional stellar and gaseous kinematics of the inner 0.8 × 1.1 kpc2 of the LINER/Seyfert 1 galaxy NGC 7213, from optical spectra obtained with the Gemini Multi-Object Spectrograph integral field spectrograph on the Gemini South telescope at a spatial resolution of ≈ 60 pc. The stellar kinematics shows an average veloci…
ALMA Observations of a Candidate Molecular Outflow in an Obscured Quasar
Greene, Jenny E.; Zakamska, Nadia L.; Nesvadba, Nicole P. H. +1 more
We present Atacama Large Millimeter/Submillimeter Array CO (1-0) and CO (3-2) observations of SDSS J135646.10+102609.0, an obscured quasar and ultra-luminous infrared galaxy with two merging nuclei and a known 20 kpc scale ionized outflow. The total molecular gas mass is M_{mol}\approx 9^{+19}_{-6}\times 10^8 M ⊙, mostly distributed in …
Planck 2013 results. IV. Low Frequency Instrument beams and window functions
Bernard, J. -P.; Planck Collaboration; Aghanim, N. +207 more
This paper presents the characterization of the in-flight beams, the beam window functions, and the associated uncertainties for the Planck Low Frequency Instrument (LFI). Knowledge of the beam profiles is necessary for determining the transfer function to go from the observed to the actual sky anisotropy power spectrum. The main beam distortions …
Can a supervoid explain the cold spot?
Nadathur, Seshadri; Räsänen, Syksy; Hotchkiss, Shaun +1 more
The discovery of a void of size ∼200 h-1 Mpc and average density contrast of ∼-0.1 aligned with the cold spot direction has been recently reported. It has been argued that, although the first-order integrated Sachs-Wolfe (ISW) effect of such a void on the cosmic microwave background is small, the second-order Rees-Sciama (RS) contributi…
Primordial magnetic field limits from the CMB trispectrum: Scalar modes and Planck constraints
Subramanian, Kandaswamy; Seshadri, T. R.; Trivedi, Pranjal
Cosmic magnetic fields are observed to be coherent on large scales and could have a primordial origin. Non-Gaussian signals in the cosmic microwave background (CMB) are generated by primordial magnetic fields as the magnetic stresses and temperature anisotropy they induce depend quadratically on the magnetic field. We compute the CMB scalar trispe…