Search Publications
A Hubble Space Telescope survey for novae in M87 - III. Are novae good standard candles 15 d after maximum brightness?
Welch, D. L.; Lauer, Tod R.; Mikołajewska, Joanna +13 more
Ten weeks of daily imaging of the giant elliptical galaxy M87 with the Hubble Space Telescope (HST) has yielded 41 nova light curves of unprecedented quality for extragalactic cataclysmic variables. We have recently used these light curves to demonstrate that the observational scatter in the so-called maximum-magnitude rate of decline (MMRD) relat…
XMM-Newton study of the supersoft symbiotic system Draco C1
Sasaki, Manami; Saeedi, Sara; Ducci, Lorenzo
We present the results of the analysis of thirty-one XMM-Newton observations of the symbiotic star Draco C1 located in the Draco dwarf spheroidal galaxy. This object had been identified as a supersoft source based on ROSAT data. We analysed X-ray, ultraviolet (UV) and optical data taken with XMM-Newton in order to obtain the physical parameters an…
Multiwavelength follow-up observations of the tidal disruption event candidate 2XMMi J184725.1-631724
Strader, Jay; Lin, Dacheng; Grupe, Dirk +5 more
The ultrasoft X-ray flare 2XMMi J184725.1-631724 was serendipitously detected in two XMM-Newton observations in 2006 and 2007, with a peak luminosity of 6 × 1043 erg s-1. It was suggested to be a tidal disruption event (TDE) because its position is consistent with the centre of an inactive galaxy. It is the only known X-ray T…
CHANG-ES - XI. Circular polarization in the cores of nearby galaxies
Saikia, D. J.; Wang, Q. Daniel; Wiegert, Theresa +18 more
We detect five galaxies in the Continuum Halos in Nearby Galaxies - an EVLA Survey (CHANG-ES) sample that show circular polarization (CP) at L band in our high-resolution data sets. Two of the galaxies (NGC 4388 and NGC 4845) show strong Stokes V/I ≡ mC ∼ 2 per cent, two (NGC 660 and NGC 3628) have values of mC ∼ 0.3 per cent…
The infrared luminosity function of AKARI 90 µm galaxies in the local Universe
Goto, Tomotsugu; Kilerci Eser, Ece
Local infrared (IR) luminosity functions (LFs) are necessary benchmarks for high-redshift IR galaxy evolution studies. Any accurate IR LF evolution studies require accordingly accurate local IR LFs. We present IR galaxy LFs at redshifts of z ≤ 0.3 from AKARI space telescope, which performed an all-sky survey in six IR bands (9, 18, 65, 90, 140, an…
Morphologies of mid-IR variability-selected AGN host galaxies
Fazio, Giovanni G.; Ashby, Matthew L. N.; Willner, S. P. +2 more
We use multi-epoch 3.6 and 4.5 µm data from the Spitzer Extended Deep Survey (SEDS) to probe the AGN population among galaxies to redshifts ∼3 via their mid-IR variability. About 1 per cent of all galaxies in our survey contain varying nuclei, 80 per cent of which are likely to be AGN. Twenty-three per cent of mid-IR variables are also X-ray…
Swift UVOT grism observations of nearby Type Ia supernovae - I. Observations and data reduction
Filippenko, A. V.; Foley, R. J.; Kuin, N. P. M. +1 more
Ultraviolet (UV) observations of Type Ia supernovae (SNe Ia) are useful tools for understanding progenitor systems and explosion physics. In particular, UV spectra of SNe Ia, which probe the outermost layers, are strongly affected by the progenitor metallicity. In this work, we present 120 Neil Gehrels Swift Observatory UV spectra of 39 nearby SNe…
Ring-type structures in the Planck map of the CMB
An, Daniel; Meissner, Krzysztof A.; Nurowski, Paweł
We present the results of the quest for ring-type structures on the maps observed by the Planck satellite. The results show that the vicinity of one radius (γ = 0.14 rad) of the rings is distinguished. Twisting the circles into deformed ellipses gives a pronounced drop of significance with the increase of twisting; however, this behaviour is also …
IGR J14257-6117, a magnetic accreting white dwarf with a very strong strong X-ray orbital modulation
Mukai, K.; de Martino, D.; Bernardini, F. +1 more
IGR J14257-6117 is an unclassified source in the hard X-ray catalogues. Optical follow-ups suggest it could be a Cataclysmic Variable (CV) of the magnetic type. We present the first high signal-to-noise (S/N) X-ray observation performed by XMM-Newton at 0.3-10 keV, complemented with 10-80 keV coverage by Swift/BAT, aimed at revealing the source na…
Infall and outflow motions towards a sample of massive star-forming regions from the RMS survey
Cunningham, N.; Lumsden, S. L.; Moore, T. J. T. +2 more
We present the results of an outflow and infall survey towards a distance-limited sample of 31 massive star-forming regions drawn from the Red MSX source (RMS) survey. The presence of young, active outflows is identified from SiO (8-7) emission and the infall dynamics are explored using HCO+/H13CO+ (4-3) emission. …