Search Publications
The clustering evolution of dusty star-forming galaxies
Baugh, Carlton M.; Cole, Shaun; Lacey, Cedric G. +1 more
We present predictions for the clustering of galaxies selected by their emission at far-infrared (FIR) and sub-millimetre wavelengths. This includes the first predictions for the effect of clustering biases induced by the coarse angular resolution of single-dish telescopes at these wavelengths. We combine a new version of the GALFORM model of gala…
The overmassive black hole in NGC 1277: new constraints from molecular gas kinematics
Krips, M.; Combes, F.; Scharwächter, J. +2 more
We report the detection of CO(1-0) emission from NGC 1277, a lenticular galaxy in the Perseus Cluster. NGC 1277 has previously been proposed to host an overmassive black hole (BH) compared to the galaxy bulge luminosity (mass), based on stellar-kinematic measurements. The CO(1-0) emission, observed with the IRAM Plateau de Bure Interferometer (PdB…
Testing gravity at large scales with H I intensity mapping
Pourtsidou, Alkistis
We investigate the possibility of testing Einstein's general theory of relativity (GR) and the standard cosmological model via the EG statistic using neutral hydrogen (H I) intensity mapping. We generalize the Fourier space estimator for EG to include H I as a biased tracer of matter and forecast statistical errors using H I …
A high mass progenitor for the Type Ic Supernova 2007gr inferred from its environment
Ramirez-Ruiz, Enrico; Maund, Justyn R.
We present an analysis of late-time Hubble Space Telescope Wide Field Camera 3 (WFC3) and Wide Field Planetary Camera 2 (WFPC2) observations of the site of the Type Ic supernova (SN) 2007gr in NGC 1058. The SN is barely recovered in the late-time WFPC2 observations, while a possible detection in the later WFC3 data is debatable. These observations…
Examining molecular clouds in the Galactic Centre region using X-ray reflection spectra simulations
Terrier, R.; Goldwurm, A.; Chernyakova, M. +1 more
In the centre of our Galaxy lies a supermassive black hole, identified with the radio source Sagittarius A⋆. This black hole has an estimated mass of around 4 million solar masses. Although Sagittarius A⋆ is quite dim in terms of total radiated energy, having a luminosity that is a factor of 1010 lower than its Edd…
Catching jetted tidal disruption events early in millimetre
Yuan, Qiang; Wang, Q. Daniel; Zhang, Bing +2 more
Relativistic jets can form from at least some tidal disruption events (TDEs) of (sub-)stellar objects around supermassive black holes. We detect the millimetre (MM) emission of IGR J12580+0134 - the nearest TDE known in the galaxy NGC 4845 at the distance of only 17 Mpc, based on Planck all-sky survey data. The data show significant flux jumps aft…
To v∞ and beyond! The He I absorption variability across the 2014.6 periastron passage of η Carinae
Hamaguchi, Kenji; Corcoran, Michael F.; Russell, Christopher M. P. +11 more
We have monitored the massive binary star η Carinae with the CTIO/Small and Moderate Aperture Research Telescope System 1.5 m telescope and CHIRON spectrograph from the previous apastron passage of the system through the recent 2014.6 periastron passage. Our monitoring has resulted in a large, homogeneous data set with an unprecedented time-sampli…
Imprint of inhomogeneous and anisotropic primordial power spectrum on CMB polarization
Ghosh, Shamik; Kothari, Rahul; Jain, Pankaj +2 more
We consider an inhomogeneous model and independently an anisotropic model of primordial power spectrum in order to describe the observed hemispherical anisotropy in cosmic microwave background radiation (CMBR). This anisotropy can be parametrized in terms of the dipole modulation model of the temperature field. Both the models lead to correlations…
Galactic survey of 44Ti sources with the IBIS telescope onboard INTEGRAL
Sunyaev, Rashid A.; Tsygankov, Sergey S.; Lutovinov, Alexander A. +4 more
We report the results of the deepest Galactic plane (|b| < 17.5°) survey in the 67.9 and 78.4 keV nuclear de-excitation lines of titanium-44 (44Ti) performed using the data acquired with the IBIS/ISGRI instrument onboard the INTEGRAL satellite during 12 yr of operation. The peak sensitivity of our survey reached an unprecedented leve…
INTEGRAL/IBIS deep extragalactic survey: M81, LMC and 3C 273/Coma fields
Sunyaev, Rashid A.; Lutovinov, Alexander A.; Sazonov, Sergey Yu. +3 more
We present results of a deep survey of three extragalactic fields, M81 (exposure of 9.7 Ms), Large Magellanic Cloud (6.8 Ms) and 3C 273/Coma (9.3 Ms), in the hard X-ray (17-60 keV) energy band with the IBIS telescope onboard the INTEGRAL observatory, based on 12 years of observations (2003-2015). The combined survey reaches a 4σ peak sensitivity o…