Search Publications
HST hot Jupiter transmission spectral survey: detection of water in HAT-P-1b from WFC3 near-IR spatial scan observations
Aigrain, S.; Pont, F.; Fortney, J. J. +13 more
We present Hubble Space Telescope near-infrared transmission spectroscopy of the transiting hot-Jupiter HAT-P-1b. We observed one transit with Wide Field Camera 3 using the G141 low-resolution grism to cover the wavelength range 1.087-1.678 µm. These time series observations were taken with the newly available spatial-scan mode that increase…
Candidate type II quasars at 2 < z < 4.3 in the Sloan Digital Sky Survey III
Brandt, W. N.; Petitjean, Patrick; Ross, Nicholas P. +12 more
At low redshifts, dust-obscured quasars often have strong yet narrow permitted lines in the rest-frame optical and ultraviolet, excited by the central active nucleus, earning the designation type II quasars. We present a sample of 145 candidate type II quasars at redshifts between 2 and 4.3, encompassing the epoch at which quasar activity peaked i…
First results from the Herschel Gould Belt Survey in Taurus
Abergel, A.; Bernard, J. -P.; Hill, T. +26 more
The whole of the Taurus region (a total area of 52 deg2) has been observed by the Herschel Spectral and Photometric Imaging Receiver (SPIRE) and Photodetector Array Camera and Spectrometer (PACS) instruments at wavelengths of 70, 160, 250, 350 and 500 µm as part of the Herschel Gould Belt Survey. In this paper we present the first…
Constraining globular cluster formation through studies of young massive clusters - I. A lack of ongoing star formation within young clusters
Cabrera-Ziri, I.; Bastian, N.; Larsen, S. S. +1 more
We present a survey of 130 Galactic and extragalactic young massive clusters (YMCs, 104 < M/M⊙ < 108, 10 < t/Myr < 1000) with integrated spectroscopy or resolved stellar photometry (40 presented here and 90 from the literature) and use the sample to search for evidence of ongoing star formation within t…
The importance of major mergers in the build up of stellar mass in brightest cluster galaxies at z = 1
Demarco, R.; Lidman, C.; Meyers, J. +22 more
Recent independent results from numerical simulations and observations have shown that brightest cluster galaxies (BCGs) have increased their stellar mass by a factor of almost 2 between z ∼ 0.9 and z ∼ 0.2. The numerical simulations further suggest that more than half this mass is accreted through major mergers. Using a sample of 18 distant galax…
Dust and star formation properties of a complete sample of local galaxies drawn from the Planck Early Release Compact Source Catalogue
Baccigalupi, C.; Bonavera, L.; Clements, D. L. +16 more
We combine Planck High Frequency Instrument data at 857, 545, 353 and 217 GHz with data from Wide-field Infrared Survey Explorer (WISE), Spitzer, IRAS and Herschel to investigate the properties of a well-defined, flux-limited sample of local star-forming galaxies. A 545 GHz flux density limit was chosen so that the sample is 80 per cent complete a…
A simplified view of blazars: the γ-ray case
Polenta, G.; Giommi, P.; Padovani, P.
We have recently proposed a new simplified scenario where blazars are classified as flat spectrum radio quasars (FSRQs) or BL Lacs according to the prescriptions of unified schemes, and to a varying combination of Doppler-boosted radiation from the jet, emission from the accretion disc, the broad line region and light from the host galaxy. Here we…
Comparing the ancient star formation histories of the Magellanic Clouds
Dolphin, Andrew E.; Skillman, Evan D.; Cole, Andrew A. +4 more
We present preliminary results from a new Hubble Space Telescope (HST) archival program aimed at tightly constraining the ancient (>4 Gyr ago) star formation histories (SFHs) of the field populations of the Small Magellanic Cloud (SMC) and Large Magellanic Cloud (LMC). We demonstrate the quality of the archival data by constructing HST/Wide Fie…
Uncovering obscured luminous AGN with WISE
Blain, A.; Carrera, F. J.; Caccianiga, A. +4 more
Mateos et al. presented a highly reliable and efficient mid-infrared (MIR) colour-based selection technique for luminous active galactic nuclei (AGN) using the Wide-field Infrared Survey Explorer (WISE) survey. Here, we evaluate the effectiveness of this technique to identify obscured AGN missed in X-ray surveys. To do so we study the WISE propert…
The horizontal branch in the UV colour-magnitude diagrams - II. The case of M3, M13 and M79
Dalessandro, E.; Salaris, M.; Mucciarelli, A. +2 more
We present a detailed comparison between far-ultraviolet (UV)/optical colour-magnitude diagrams obtained with high-resolution Hubble Space Telescope data and suitable theoretical models for three Galactic globular clusters: M3, M13 and M79.
These systems represents a `classical' example of clusters in the intermediate-metallicity regime that,…