Search Publications
Searching for the orbital period of the ultraluminous X-ray source NGC 1313 X-2
Falomo, R.; Soria, R.; Zampieri, L. +2 more
We analysed the longest phase-connected photometric data set available for NGC 1313 X-2, looking for the ∼6-day modulation reported by Liu et al.. The folded B-band light curve shows a ∼6-day periodicity with a significance slightly larger than 3σ. The low statistical significance of this modulation, along with the lack of detection in the V band,…
Re-examining the XMM-Newton spectrum of the black hole candidate XTE J1652-453
Fabian, A. C.; Reis, R. C.; Walton, D. J. +1 more
The XMM-Newton spectrum of the black hole candidate XTE J1652-453 shows a broad and strong Fe Kα emission line, generally believed to originate from reflection of the inner accretion disc. These data have been analysed by Hiemstra et al. using a variety of phenomenological models. We re-examine the spectrum with a self-consistent relativistic refl…
The radio spectra of reddened Two Micron All Sky Survey quasi-stellar objects: evidence for young radio jets
Georgakakis, A.; Hopkins, A. M.; Afonso, J. +1 more
Multifrequency radio continuum observations (1.4-22 GHz) of a sample of reddened quasi-stellar objects (QSOs) are presented. We find a high incidence (13/16) of radio spectral properties, such as low-frequency turnovers, high-frequency spectral breaks or steep power-law slopes, similar to those observed in powerful compact steep spectrum (CSS) and…
Dwarf galaxies in the Coma cluster - II. Spectroscopic and photometric fundamental planes
Mobasher, B.; Carter, D.; Khosroshahi, H. G. +1 more
We present a study of the Fundamental Plane (FP) for a sample of 71 dwarf galaxies in the core of the Coma cluster in the magnitude range -21 < MI < -15. Taking advantage of the high-resolution DEIMOS spectrograph on Keck II for measuring the internal velocity dispersion of galaxies and high-resolution imaging of the Hubble Space …
Disc scalelengths out to redshift 5.8
Hatziminaoglou, E.; Fathi, K.; Epinat, B. +1 more
We compute the exponential disc scalelength for 686 disc galaxies with spectroscopic redshifts out to redshift 5.8 based on Hubble Space Telescope archival data. We compare the results with our previous measurements based on 30 000 nearby galaxies from the Sloan Digital Sky Survey. Our results confirm the presence of a dominating exponential compo…
Ionized X-ray reverberation mapping: testing a light-bending model for 1H0707-495
Chainakun, P.; Young, A. J.
The narrow-line Seyfert 1 galaxy 1H0707-495 has shown the first clear evidence of X-ray reverberation in which the soft, disc-reflection and Fe-L-dominated 0.3-1 keV band lags behind the hard, continuum-dominated 1-4 keV band by ≈ 30 s. A simple reflection model, however, cannot explain the different amplitudes of variability between the continuum…
Infrared observations of the recurrent nova T Pyxidis: ancient dust basks in the warm glow of the 2011 outburst★
Ness, J. -U.; Gehrz, R. D.; Eyres, S. P. S. +15 more
We present Spitzer Space Telescope and Herschel Space Observatory infrared observations of the recurrent nova T Pyx during its 2011 eruption, complemented by ground-base optical-infrared photometry. We find that the eruption has heated dust in the pre-existing nebulosity associated with T Pyx. This is most likely interstellar dust swept up by T Py…
Evidence of an interaction from resolved stellar populations: the curious case of NGC 1313
Larsen, S. S.; Silva-Villa, E.
The galaxy NGC 1313 has attracted the attention of various studies due to the peculiar morphology observed in optical bands, although it is classified as a barred, late-type galaxy with no apparent close-by companions. However, the velocity field suggests an interaction with a satellite companion. Using resolved stellar populations, we study diffe…
Herschel observations of a z∼ 2 stellar mass selected galaxy sample drawn from the GOODS NICMOS Survey
Berta, S.; Magnelli, B.; Nordon, R. +28 more
We present a study of the far-infrared (IR) properties of a stellar mass selected sample of 1.5 < z < 3 galaxies with log (M*/M⊙) > 9.5 drawn from the Great Observatories Origins Deep Survey (GOODS) Near Infrared Camera and Multi-Object Spectrometer (NICMOS) Survey (GNS), the deepest H-band Hubble Space Telescope sur…
Identifying Type IIn supernova progenitors in our Galaxy: the circumstellar environment of the Galactic luminous blue variable candidate Gal 026.47+0.02
Paladini, R.; Umana, G.; Agliozzo, C. +7 more
New data from the Herschel Infrared Galactic Plane Survey (Hi-GAL) and the Expanded Very Large Array, together with ancillary multifrequency data from different archives, have provided a comprehensive picture of the circumstellar envelope (CSE) surrounding the Galactic luminous blue variable (LBV) candidate Gal 026.47+0.02. The high angular resolu…