Search Publications
The peculiar 2011 outburst of the black hole candidate IGR J17091-3624, a GRS 1915+105-like source?
Capitanio, F.; Ferrigno, C.; Bozzo, E. +3 more
We report on the long-term monitoring campaign of the black hole candidate IGR J17091-3624 performed with INTEGRAL and Swift during the peculiar outburst started on 2011 January. We have studied the two-month spectral evolution of the source in detail. Unlike the previous outbursts, the initial transition from the hard to the soft state in 2011 wa…
Mergers and interactions in Sloan Digital Sky Survey type 2 quasars at z∼ 0.3-0.4. SDSS J143027.66-005614.8: a case study
Villar-Martín, M.; Rose, M.; Cabrera Lavers, A. +3 more
We present a compilation of Hubble Space Telescope (HST) images of 58 luminous Sloan Digital Sky Survey (SDSS) type 2 active galactic nuclei (AGNs) at ?. Of these, 42 are type 2 quasars, which is a good representation of all optically selected SDSS type 2 quasars in this z range. We find that the majority of the host galaxies are ellipticals (30/4…
The needle in the haystack: searching for transiting extrasolar planets in CoRoT stellar light curves
Pätzold, M.; Grziwa, S.; Carone, L.
EXOTRANS is a software package developed by the Department of Planetary Research of the Rheinisches Institut für Umweltforschung (RIU-PF) at Cologne University for detecting transit signals from extrasolar planets in stellar light curves. EXOTRANS is used very successfully by RIU-PF within the CoRoT mission. The software package uses two different…
Cyclotron resonance energies and orbital elements of accretion pulsar 4U 0115+63 during the giant outburst in 2008
Wang, Wei; Zhao, Yongheng; Li, Jun
In this paper, we present both timing and spectral analyses of the outburst of 4U 0115+63 in 2008 April-May with International Gamma-Ray Astrophysics Laboratory (INTEGRAL) and Rossi X-ray Timing Explorer (RXTE) observations. We have determined the spin period of the neutron star at ∼3.614 30 ± 0.000 03 s, a spin-up rate during the outburst of ?, t…
A simple empirically motivated template for the thermal Sunyaev-Zel'dovich effect
Efstathiou, George; Migliaccio, Marina
We develop a model for the power spectrum of unresolved clusters of galaxies arising from the thermal Sunyaev-Zel'dovich (tSZ) effect. The model is based on a 'universal' gas pressure profile constrained by X-ray observations and includes a parameter to describe departures from self-similar evolution. The model is consistent with recent Planck obs…
A decrease of the gas exchanges between galaxies and the intergalactic medium, from 12 to 6 billion years ago
Flores, H.; Hammer, F.; Puech, M. +2 more
Using a representative sample of 65 intermediate-mass galaxies at z∼ 0.6, we have investigated the interplay between the main ingredients of chemical evolution: metal abundance, gas mass, stellar mass and star formation rate (SFR). All quantities have been estimated using deep spectroscopy and photometry from ultraviolet to infrared and assuming a…
Measuring star formation in high-z massive galaxies: a mid-infrared to submillimetre study of the GOODS NICMOS Survey sample
Netterfield, C. B.; Scott, D.; Halpern, M. +16 more
We present measurements of the mean mid-infrared to submillimetre flux densities of massive (M★≳ 1011 M⊙) galaxies at redshifts 1.7 < z < 2.9, obtained by stacking positions of known objects taken from the GOODS NICMOS Survey (GNS) catalogue on maps at 24 ?m (Spitzer/MIPS); 70, 100 and 160 ?m (Herschel/PACS);…
Cores in infrared dark clouds (IRDCs) seen in the Hi-GAL survey between l= 300° and 330°
Peretto, N.; Elia, D.; Griffin, M. J. +15 more
We have used data taken as part of the Herschel infrared Galactic Plane survey (Hi-GAL) to study 3171 infrared dark cloud (IRDC) candidates that were identified in the mid-IR (8 µm) by Spitzer (we refer to these as `Spitzer-dark' regions). They all lie in the range l= 300-330° and |b|≤ 1°. Of these, only 1205 were seen in emission in the far…
An ancient metal-poor population in M32, and halo satellite accretion in M31, identified by RR Lyrae stars
Lauer, Tod R.; Yang, S. -C.; Sarajedini, Ata +2 more
We present time series photometry of two fields near M32 using archival observations from the Advanced Camera for Surveys Wide Field Channel on-board the Hubble Space Telescope. One field is centred about 2 arcmin from M32, while the other is located 15 arcmin to the south-east of M31. The imaging covers a time baseline sufficient for the identifi…
Comparison of star formation rates from Hα and infrared luminosity as seen by Herschel
Kneib, J. -P.; Berta, S.; Magnelli, B. +56 more
We empirically MD test the relation between the SFR(LIR) derived from the infrared luminosity, LIR, and the SFR(Hα) derived from the Hα emission line luminosity using simple conversion relations. We use a sample of 474 galaxies at z = 0.06-0.46 with both Hα detection [from 20k redshift Cosmological Evolution (zCOSMOS) survey]…