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Estimating sizes of faint, distant galaxies in the submillimetre regime
Karim, A.; Hodge, J. A.; Coppin, K. +8 more
We measure the sizes of redshift ∼2 star-forming galaxies by stacking data from the Atacama Large Millimeter/submillimeter Array (ALMA). We use a uv-stacking algorithm in combination with model fitting in the uv-domain and show that this allows for robust measures of the sizes of marginally resolved sources. The analysis is primarily based on the …
GAMA/H-ATLAS: common star formation rate indicators and their dependence on galaxy physical parameters
Wang, L.; Cooray, A.; Ibar, E. +30 more
We compare common star formation rate (SFR) indicators in the local Universe in the Galaxy and Mass Assembly (GAMA) equatorial fields (∼160 deg2), using ultraviolet (UV) photometry from GALEX, far-infrared and sub-millimetre (sub-mm) photometry from Herschel Astrophysical Terahertz Large Area Survey, and Hα spectroscopy from the GAMA su…
The Binary Black Hole Model for Mrk 231 Bites the Dust
Gallagher, Sarah C.; Terndrup, Donald M.; Leighly, Karen M. +1 more
Mrk 231 is a nearby quasar with an unusually red near-UV-to-optical continuum, generally explained as heavy reddening by dust. Yan et al. proposed that Mrk 231 is a milliparsec black hole binary with little intrinsic reddening. We show that if the observed FUV continuum is intrinsic, as assumed by Yan et al., it fails by a factor of about 100 in p…
Eta Carinae's Thermal X-Ray Tail Measured with XMM-Newton and NuSTAR
Hamaguchi, Kenji; Corcoran, Michael F.; Russell, Christopher M. P. +12 more
The evolved, massive highly eccentric binary system, η Car, underwent a periastron passage in the summer of 2014. We obtained two coordinated X-ray observations with XMM-Newton and NuSTAR during the elevated X-ray flux state and just before the X-ray minimum flux state around this passage. These NuSTAR observations clearly detected X-ray emission …
Starbursts and dusty tori in distant 3CR radio galaxies
Barthel, Peter; Drouart, Guillaume; Podigachoski, Pece +2 more
We present a study of the complete ultraviolet to submillimetre spectral energy distributions (SEDs) of 12 3CR radio galaxy hosts in the redshift range 1.0 < z < 2.5, which were all detected in the far-infrared by the Herschel Space Observatory. The study employs the new spectro-chemical evolutionary code PÉGASE.3, in combination with recent…
The Tale of the Two Tails of the Oldish PSR J2055+2539
De Luca, Andrea; Caraveo, Patrizia; Marelli, Martino +3 more
We analyzed a deep XMM-Newton observation of the radio-quiet γ-ray PSR J2055+2539. The spectrum of the X-ray counterpart is nonthermal, with a photon index of Γ = 2.36 ± 0.14 (1σ confidence). We detected X-ray pulsations with a pulsed fraction of 25% ± 3% and a sinusoidal shape. Taking into account considerations on the γ-ray efficiency of the pul…
Genesis of Interplanetary Intermittent Turbulence: A Case Study of Rope&enrope Magnetic Reconnection
Miranda, Rodrigo A.; Chian, Abraham C. -L.; Muñoz, Pablo R. +5 more
In a recent paper, the relation between current sheet, magnetic reconnection, and turbulence at the leading edge of an interplanetary coronal mass ejection was studied. We report here the observation of magnetic reconnection at the interface region of two interplanetary magnetic flux ropes. The front and rear boundary layers of three interplanetar…
Dipole modulation of cosmic microwave background temperature and polarization
Ghosh, Shamik; Kothari, Rahul; Jain, Pankaj +1 more
We propose a dipole modulation model for the Cosmic Microwave Background Radiation (CMBR) polarization field. We show that the model leads to correlations between l and l+1 multipoles, exactly as in the case of temperature. We obtain results for the case of TE, EE and BB correlations. An anisotropic or inhomogeneous model of primordial power spect…
Searching for filaments and large-scale structure around DAFT/FADA clusters
Adami, C.; Martinet, N.; Durret, F. +6 more
Context. Clusters of galaxies are located at the intersection of cosmic filaments and are still accreting galaxies and groups along these preferential directions. However, because of their relatively low contrast on the sky, filaments are difficult to detect (unless a large amount of spectroscopic data are available), and unambiguous detections ha…
The First High-phase Observations of a KBO: New Horizons Imaging of (15810) 1994 JR1 from the Kuiper Belt
Olkin, Cathy B.; Stern, S. Alan; Young, Leslie A. +12 more
NASA’s New Horizons spacecraft observed (15810) 1994 JR1, a 3:2 resonant Kuiper belt object (KBO), using the LOng Range Reconnaissance Imager (LORRI) on 2015 November 2 from a distance of 1.85 au and again on 2016 April 7 from a distance of 0.71 au. These were the first close observations of any KBO other than Pluto. Combining ground-ba…