Search Publications
Discovery of high-frequency iron K lags in Ark 564 and Mrk 335
Fabian, A. C.; Uttley, P.; Cackett, E. M. +3 more
We use archival XMM-Newton observations of Ark 564 and Mrk 335 to calculate the frequency-dependent time lags for these two well-studied sources. We discover high-frequency Fe K lags in both sources, indicating that the red wing of the line precedes the rest-frame energy by roughly 100 and 150 s for Ark 564 and Mrk 335, respectively. Including the…
Calibration of the total infrared luminosity of nearby galaxies from Spitzer and Herschel bands
Helou, G.; Boquien, M.; Roussel, H. +20 more
When combined with infrared observations with the Spitzer telescope (3 to 160 µm), the Herschel Space Observatory now fully samples the thermal dust emission up to 500 µm and enables us to better estimate the total infrared-submm energy budget (LTIR) of nearby galaxies. We present new empirical calibrations to estimate resol…
Long XMM observation of the narrow-line Seyfert 1 galaxy IRAS 13224-3809: rapid variability, high spin and a soft lag
Young, A. J.; Brandt, W. N.; Ponti, G. +21 more
The narrow-line Seyfert 1 galaxy IRAS 13224-3809 has been observed with XMM-Newton for 500 ks. The source is rapidly variable on time-scales down to a few 100 s. The spectrum shows strong broad Fe - K and L emission features which are interpreted as arising from reflection from the inner parts of an accretion disc around a rapidly spinning black h…
Flux calibration of the Herschel★-SPIRE photometer
Valtchanov, I.; Bock, J. J.; Spencer, L. D. +16 more
We describe the procedure used to flux calibrate the three-band submillimetre photometer in the Spectral and Photometric Imaging Receiver instrument on the Herschel Space Observatory. This includes the equations describing the calibration scheme, a justification for using Neptune as the primary calibration source, a description of the observations…
One-dimensional delayed-detonation models of Type Ia supernovae: confrontation to observations at bolometric maximum
Hillier, D. John; Dessart, Luc; Blondin, Stéphane +1 more
The delayed-detonation explosion mechanism applied to a Chandrasekhar-mass white dwarf offers a very attractive model to explain the inferred characteristics of Type Ia supernovae (SNe Ia). The resulting ejecta are chemically stratified, have the same mass and roughly the same asymptotic kinetic energy, but exhibit a range in 56Ni mass.…
Massive starburst galaxies in a z = 2.16 proto-cluster unveiled by panoramic Hα mapping
Smail, Ian; Koyama, Yusei; Kodama, Tadayuki +5 more
We present a panoramic narrow-band study of Hα emitters in the field of the z = 2.16 proto-cluster around PKS 1138-262 using MOIRCS on the Subaru Telescope. We find 83 Hα emitters down to a star formation rate of SFR (Hα) ∼ 10 M⊙ yr-1 across a ∼ 7 × 7 arcmin2 region centred on the radio galaxy, and identify ∼10-Mpc…
The SCUBA-2 Cosmology Legacy Survey: blank-field number counts of 450-µm-selected galaxies and their contribution to the cosmic infrared background
Ivison, R. J.; Clements, D. L.; Smail, Ian +50 more
The first deep blank-field 450 µm map (1σ ≈ 1.3 mJy) from the Submillimetre Common-User Bolometer Array-2 SCUBA-2 Cosmology Legacy Survey (S2CLS), conducted with the James Clerk Maxwell Telescope (JCMT) is presented. Our map covers 140 arcmin2 of the Cosmological Evolution Survey field, in the footprint of the Hubble Space Telesco…
Peanuts at an angle: detecting and measuring the three-dimensional structure of bars in moderately inclined galaxies
Debattista, Victor P.; Erwin, Peter
We show that direct detection and measurement of the vertically thickened parts of bars (so-called `boxy' or `peanut-shaped' bulges) are possible not only for edge-on galaxies but also for galaxies with moderate inclinations (i < 70°), and that examples are relatively common in the nearby Universe. The analysis of a sample of 78 nearby, moderat…
The origin of the lag spectra observed in AGN: Reverberation and the propagation of X-ray source fluctuations
Fabian, A. C.; Wilkins, D. R.
The X-ray emission from active galactic nuclei (AGN) is highly variable. Measurements of time lags (characterized by lag spectra) between variability in the light curves in energy bands corresponding to directly observed continuum emission from the corona around the black hole and to X-rays reflected from the accretion disc add a further dimension…
The closest look at 1H0707-495: X-ray reverberation lags with 1.3 Ms of data
Fabian, A. C.; Steiner, J. F.; Uttley, P. +4 more
Reverberation lags in active galactic nuclei (AGN) were first discovered in the NLS1 galaxy, 1H0707-495. We present a follow-up analysis using 1.3 Ms of data, which allows for the closest ever look at the reverberation signature of this remarkable source. We confirm previous findings of a hard lag of ∼100 s at frequencies ν ∼ [0.5-4] × 10-4