Search Publications
Combining physical galaxy models with radio observations to constrain the SFRs of high-z dusty star-forming galaxies
Franceschini, A.; Efstathiou, A.; Silva, L. +2 more
We complement our previous analysis of a sample of z ∼ 1-2 luminous and ultraluminous infrared galaxies [(U)LIRGs], by adding deep Very Large Array radio observations at 1.4 GHz to a large data set from the far-UV to the submillimetre, including Spitzer and Herschel data. Given the relatively small number of (U)LIRGs in our sample with high signal…
Statistics and accuracy of magnetic null identification in multispacecraft data
André, M.; Vaivads, A.; Khotyaintsev, Yu. V. +2 more
Complex magnetic topologies are ubiquitous in astrophysical plasmas. Analyzing magnetic nulls, regions of vanishing magnetic field, is one way to characterize 3-D magnetic topologies. Magnetic nulls are believed to be important in 3-D reconnection and turbulence. In the vicinity of a null, plasma particles become unmagnetized and can be accelerate…
Sub-arcsec mid-IR observations of NGC 1614: Nuclear star formation or an intrinsically X-ray weak AGN?
Colina, L.; García-Burillo, S.; Herrero-Illana, R. +10 more
We present new mid-infrared (mid-IR) N-band spectroscopy and Q-band photometry of the local luminous IR galaxy NGC 1614, one of the most extreme nearby starbursts. We analyse the mid-IR properties of the nucleus (central 150 pc) and four regions of the bright circumnuclear (diameter∼600 pc) star-forming (SF) ring of this object. The nucleus differ…
Magnetospheric Accretion in Close Pre-main-sequence Binaries
Herczeg, Gregory J.; Ardila, David R.; Mathieu, Robert D. +2 more
The transfer of matter between a circumbinary disk and a young binary system remains poorly understood, obscuring the interpretation of accretion indicators. To explore the behavior of these indicators in multiple systems, we have performed the first systematic time-domain study of young binaries in the ultraviolet. We obtained far- and near-ultra…
Venus' clouds as inferred from the phase curves acquired by IR1 and IR2 on board Akatsuki
Imamura, Takeshi; Ueno, Munetaka; Kasaba, Yasumasa +12 more
We present phase curves for Venus in the 1-2 µm wavelength region, acquired with IR1 and IR2 on board Akatsuki (February-March 2011). A substantial discrepancy with the previously-published curves was found in the small phase angle range (0-30°). Through analysis by radiative-transfer computation, it was found that the visibility of larger (…
Herschel imaging of the dust in the Helix nebula (NGC 7293)
Ivison, R. J.; Olofsson, G.; Gomez, H. L. +19 more
Aims: In our series of papers presenting the Herschel imaging of evolved planetary nebulae, we present images of the dust distribution in the Helix nebula (NGC 7293).
Methods: Images at 70, 160, 250, 350, and 500 µm were obtained with the PACS and SPIRE instruments on board the Herschel satellite.
Results: The broadband maps s…
Origin and Kinematics of the Eruptive Flow from XZ Tau Revealed by ALMA
Palau, Aina; Galván-Madrid, Roberto; Zapata, Luis A. +6 more
We present high angular resolution (∼0.″94) 12CO(1-0) Atacama Large Millimeter/submillimeter Array (ALMA) observations obtained during the 2014 long baseline campaign from the eruptive bipolar flow from the multiple XZ Tau stellar system discovered by the Hubble Space Telescope (HST). These observations reveal, for the first time, the k…
Measurement of Galaxy Cluster Integrated Comptonization and Mass Scaling Relations with the South Pole Telescope
Gladders, M. D.; Rest, A.; Foley, R. J. +67 more
We describe a method for measuring the integrated Comptonization (Y SZ) of clusters of galaxies from measurements of the Sunyaev-Zel'dovich (SZ) effect in multiple frequency bands and use this method to characterize a sample of galaxy clusters detected in the South Pole Telescope (SPT) data. We use a Markov Chain Monte Carlo method to f…
Ionospheric photoelectrons at Venus: Case studies and first observation in the tail
Coates, A. J.; Fedorov, A.; Barabash, S. +5 more
The presence of photoelectrons in ionospheres, including that of unmagnetised Venus, can be inferred from their characteristic spectral peaks in the electron energy spectrum. The electrons within the peaks are created by the photoionisation of neutrals in the upper atmosphere by the solar HeII 30.4 nm line. Here, we present some case studies of ph…
Power law inflation with a non-minimally coupled scalar field in light of Planck 2015 data: the exact versus slow roll results
Herrera, Ramón; del Campo, Sergio; Gonzalez, Carlos
We study the power law inflation in the context of non-minimally coupled to the scalar curvature. We analyze the inflationary solutions under an exact analysis and also in the slow roll approximations. In both solutions, we consider the recent data from Planck 2015 data to constraint the parameters in our model. In this framework, we find that in …