Search Publications
Constraints on small-scale cosmological fluctuations from SNe lensing dispersion
Ben-Dayan, Ido; Takahashi, Ryuichi
We provide predictions on small-scale cosmological density power spectrum from supernova lensing dispersion. Parametrizing the primordial power spectrum with running α and running of running β of the spectral index, we exclude large positive α and β parameters which induce too large lensing dispersions over current observational upper bound. We ra…
YSO jets in the Galactic plane from UWISH2 - III. Jets and outflows in Cassiopeia and Auriga
Froebrich, D.; Makin, S. V.
We present the analysis of 35.5 deg2 of images in the 1-0 S(1) line of H2 from the UK Widefield Infrared Survey for H2 (UWISH2) towards Cassiopeia and Auriga. We have identified 98 Molecular Hydrogen emission-line Objects (MHOs) driven by Young Stellar Objects, 60 per cent of which are bipolar outflows and all are …
V4743 Sgr, a magnetic nova?
Mukai, K.; Orio, M.; Bianchini, A. +3 more
Two XMM-Newton observations of Nova V4743 Sgr (Nova Sgr 2002) were performed shortly after it returned to quiescence, 2 and 3.5 yr after the explosion. The X-ray light curves revealed a modulation with a frequency of ≃0.75 mHz, indicating that V4743 Sgr is most probably an intermediate polar (IP). The X-ray spectra have characteristics in common w…
Radio-optical galaxy shape correlations in the COSMOS field
Brown, Michael L.; Harrison, Ian; Tunbridge, Ben
We investigate the correlations in galaxy shapes between optical and radio wavelengths using archival observations of the Cosmic Evolution Survey (COSMOS) field. Cross-correlation studies between different wavebands will become increasingly important for precision cosmology as future large surveys may be dominated by systematic rather than statist…
The massive dark halo of the compact early-type galaxy NGC 1281
Gebhardt, Karl; van de Ven, Glenn; Husemann, Bernd +7 more
We investigate the compact, early-type galaxy NGC 1281 with integral field unit observations to map the stellar line-of-sight velocity distribution (LOSVD) out to five effective radii and construct orbit-based dynamical models to constrain its dark and luminous matter content. Under the assumption of mass-follows-light, the H-band stellar mass-to-…
A giant radio halo in a low-mass SZ-selected galaxy cluster: ACT-CL J0256.5+0006
Bond, J. R.; Menanteau, F.; Bharadwaj, V. +19 more
We present the detection of a giant radio halo (GRH) in the Sunyaev-Zel'dovich (SZ)-selected merging galaxy cluster ACT-CL J0256.5+0006 (z = 0.363), observed with the Giant Metrewave Radio Telescope at 325 and 610 MHz. We find this cluster to host a faint (S610 = 5.6 ± 1.4 mJy) radio halo with an angular extent of 2.6 arcmin, correspond…
Observations of high-plasma density region in the inner coma of 67P/Churyumov-Gerasimenko during early activity
Edberg, N. J. T.; Simon Wedlund, C.; Eriksson, A. I. +5 more
In 2014 September, as Rosetta transitioned to close bound orbits at 30 km from comet 67P/Churyumov-Gerasimenko, the Rosetta Plasma Consortium Langmuir probe (RPC-LAP) data showed large systematic fluctuations in both the spacecraft potential and the collected currents. We analyse the potential bias sweeps from RPC-LAP, from which we extract three …
AGN-driven perturbations in the intracluster medium of the cool-core cluster ZwCl 2701
Naik, Sachindra; Vagshette, Nilkanth D.; Sonkamble, Satish S. +1 more
We present the results obtained from a total of 123 ks X-ray (Chandra) and 8 h of 1.4 GHz radio (Giant Metrewave Radio Telescope - GMRT) observations of the cool-core cluster ZwCl 2701 (z = 0.214). These observations of ZwCl 2701 showed the presence of an extensive pair of ellipsoidal cavities along the east and west directions within the central …
The apparent synchronization of V1500 Cygni
Harrison, Thomas E.; Campbell, Ryan K.
We have used XMM-Newton and ground-based optical/near-infrared photometry to explore the old classical nova, and asynchronous polar V1500 Cyg. The X-ray light curve shows a single bright phase once per orbit, associated with the main accretion region. Analysis of the X-ray light curve indicates that the white dwarf spin period is now similar to th…
Detailed study of the microwave emission of the supernova remnant 3C 396
de Bernardis, P.; Masi, S.; Piacentini, F. +8 more
We have observed the supernova remnant 3C 396 in the microwave region using the Parkes 64-m telescope. Observations have been made at 8.4, 13.5, and 18.6 GHz and in polarization at 21.5 GHz. We have used data from several other observatories, including previously unpublished observations performed by the Green Bank Telescope at 31.2 GHz, to invest…