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Revisiting constraints on the (pseudo)conformal universe with Planck data
Rubtsov, G. I.; Ramazanov, S. R.
We revisit constraints on the (pseudo)conformal universe from the nonobservation of statistical anisotropy in the Planck data. The quadratic maximal likelihood estimator is applied to the Planck temperature maps at frequencies 143 and 217 GHz as well as their cross-correlation. The strongest constraint is obtained in the scenario of the (pseudo)co…
Investigation of the Progenitors of the Type Ia Supernovae Associated with the LMC Supernova Remnants 0505-67.9 and 0509-68.7
Schaefer, Bradley E.; Pagnotta, Ashley
Although Type Ia supernovae have been heavily scrutinized due to their use in making cosmological distance estimates, we are still unable to definitively identify the progenitors for the entire population. While answers have been presented for certain specific systems, a complete solution remains elusive. We present observations of two supernova r…
Photometric evidence of an intermediate-age stellar population in the inner bulge of M31
Williams, Benjamin F.; Lauer, Tod R.; Dalcanton, Julianne J. +5 more
We explore the assembly history of the M31 bulge within a projected major-axis radius of 180 arcsec (∼680 pc) by studying its stellar populations in Hubble Space Telescope Wide Field Camera 3 and Advanced Camera for Surveys observations. Colours formed by comparing near-ultraviolet versus optical bands are found to become bluer with increasing maj…
Tightening the belt: Constraining the mass and evolution in SDC335
Avison, A.; Peretto, N.; Fuller, G. A. +3 more
Aims: Recent ALMA observations identified one of the most massive star-forming cores yet observed in the Milky Way: SDC335-MM1, within the infrared dark cloud SDC335.579-0.292. Along with an accompanying core MM2, SDC335 appears to be in the early stages of its star formation process. We aim to constrain the properties of the stars forming wi…
Recent highlights from Cluster, the first 3-D magnetospheric mission
Escoubet, C. P.; Goldstein, M. L.; Masson, A. +1 more
The Cluster mission has been operated successfully for 14 years. During this time period, the evolution of the orbit has enabled Cluster to sample many more magnetospheric regions than was initially anticipated. So far, the separation of the Cluster spacecraft has been changed more than 30 times and has ranged from a few kilometres up to 36 000 km…
Constraining dark sector perturbations I: cosmic shear and CMB lensing
Battye, Richard A.; Moss, Adam; Pearson, Jonathan A.
We present current and future constraints on equations of state for dark sector perturbations. The equations of state considered are those corresponding to a generalized scalar field model and time-diffeomorphism invariant ℒ(g) theories that are equivalent to models of a relativistic elastic medium and also Lorentz violating massive gravity. We de…
Suzaku observation of Be/X-ray binary pulsar EXO 2030+375
Naik, Sachindra; Jaisawal, Gaurava K.
We study the timing and spectral properties of Be/X-ray binary pulsar EXO 2030+375 using a Suzaku observation taken on 2012 May 23, during a less intense Type I outburst. Pulsations were clearly detected in the X-ray light curves at a barycentric period of 41.2852 s, which suggest that the pulsar is spinning-up. The pulse profiles were found to be…
Signature of the presence of a third body orbiting around XB 1916-053
Sanna, A.; Romano, P.; Di Salvo, T. +9 more
Context. The ultra-compact dipping source
Cosmic microwave background anisotropies in the timescape cosmology
Wiltshire, David L.; Nazer, M. Ahsan
We analyze the spectrum of cosmic microwave background (CMB) anisotropies in the timescape cosmology: a potentially viable alternative to homogeneous isotropic cosmologies without dark energy. We exploit the fact that the timescape cosmology is extremely close to the standard cosmology at early epochs to adapt existing numerical codes to produce C…
Detection of fundamental and first harmonic cyclotron line in X-ray pulsar Cep X-4
Naik, Sachindra; Jaisawal, Gaurava K.
We report the broad-band spectral properties of the X-ray pulsar Cep X-4 by using a Suzaku observation in 2014 July. The 0.8-70 keV spectrum was found to be well described by three continuum models - Negative and Positive power-law with Exponential cut-off (NPEX), high-energy cut-off power-law and CompTT models. Additional components such as a cyc…