Search Publications
An HST/COS survey of molecular hydrogen in DLAs & sub-DLAs at z < 1: molecular fraction and excitation temperature
Muzahid, S.; Srianand, R.; Charlton, J.
We present the results of a systematic search for molecular hydrogen (H2) in low-redshift (0.05 ≲ z ≲ 0.7) Damped Lyα absorbers (DLAs) and sub-DLAs with N({H II}) ≳ 10^{19.0} cm-2, in the archival Hubble Space Telescope/Cosmic Origins Spectrograph spectra. Our core sample is comprised of 27 systems with a median log N({H I}) …
Calibration of the Swift-UVOT ultraviolet and visible grisms
Carter, M.; Mehdipour, M.; Brown, P. J. +16 more
We present the calibration of the Swift Ultraviolet and Optical Telescope (UVOT ) grisms, of which there are two, providing low-resolution field spectroscopy in the ultraviolet and optical bands, respectively. The UV grism covers the range λ1700-5000 Å with a spectral resolution (λ/Δλ) of 75 at λ2600 Å for source magnitudes of u=10-16 mag, while t…
MUSE observations of the lensing cluster SMACSJ2031.8-4036: new constraints on the mass distribution in the cluster core.
Richard, J.; Pello, R.; Bacon, R. +10 more
We present new observations of the lensing cluster SMACSJ2031.8-4036 obtained with the Multi Unit Spectroscopic Explorer (MUSE) integral field spectrograph as part of its commissioning on the Very Large Telescope. By providing medium-resolution spectroscopy over the full 4750-9350 Å domain and a 1 × 1 arcmin2 field of view, MUSE is idea…
Total eclipse of the heart: the AM CVn Gaia14aae/ASSASN-14cn
Prusti, T.; Gilmore, G.; Drake, A. J. +82 more
We report the discovery and characterization of a deeply eclipsing AM CVn-system, Gaia14aae (=ASSASN-14cn). Gaia14aae was identified independently by the All-Sky Automated Survey for Supernovae (ASAS-SN; Shappee et al.) and by the Gaia Science Alerts project, during two separate outbursts. A third outburst is seen in archival Pan-STARRS-1 (PS1; Sc…
Observations of radio-quiet quasars at 10-mas resolution by use of gravitational lensing
Sluse, Dominique; Jackson, Neal; Tagore, Amitpal S. +5 more
We present Very Large Array detections of radio emission in 4 four-image gravitational lens systems with quasar sources: HS 0810+2554, RX J0911+0511, HE 0435-1223 and SDSS J0924+0219, and extended Multi-Element Remote Linked Interferometer (e-MERLIN) observations of two of the systems. The first three are detected at a high level of significance, …
Hubble Space Telescope search for the transit of the Earth-mass exoplanet α Centauri B b
Chaplin, William J.; Seager, Sara; Günther, Maximilian N. +13 more
Results from exoplanet surveys indicate that small planets (super-Earth size and below) are abundant in our Galaxy. However, little is known about their interiors and atmospheres. There is therefore a need to find small planets transiting bright stars, which would enable a detailed characterization of this population of objects. We present the res…
Hierarchical star formation across the ring galaxy NGC 6503
Gouliermis, Dimitrios A.; Grebel, Eva K.; Smith, Linda J. +25 more
We present a detailed clustering analysis of the young stellar population across the star-forming ring galaxy NGC 6503, based on the deep Hubble Space Telescope photometry obtained with the Legacy ExtraGalactic UV Survey. We apply a contour-based map analysis technique and identify in the stellar surface density map 244 distinct star-forming struc…
A Compton-thin solution for the Suzaku X-ray spectrum of the Seyfert 2 galaxy Mkn 3
Turner, T. J.; Yaqoob, T.; Tatum, M. M. +2 more
Mkn 3 is a Seyfert 2 galaxy that is widely regarded as an exemplary Compton-thick Active Galactic Nucleus (AGN). We study the Suzaku X-ray spectrum using models of the X-ray reprocessor that self-consistently account for the Fe Kα fluorescent emission line and the associated Compton-scattered, or reflection, continuum. We find a solution in which …
Resolving structure of the disc around HD100546 at 7 mm with ATCA
Wilner, D. J.; van Dishoeck, E. F.; Pinilla, P. +7 more
There is much evidence that planet formation is occurring in the disc around the Herbig Be star HD100546. To learn more about the processes occurring in this disc, we conducted high-resolution imaging at 43/45 GHz with the Australia Telescope Compact Array. Multiple array configurations were used, providing a best spatial resolution of ∼0.15 arcse…
A treatment procedure for VLT/SINFONI data cubes: application to NGC 5643
Ricci, T. V.; Steiner, J. E.; May, D. +3 more
In this second paper of a series, we present a treatment procedure for data cubes obtained with the Spectrograph for Integral Field Observations in the Near Infrared of the Very Large Telescope. We verified that the treatment procedure improves significantly the quality of the images of the data cubes, allowing a more detailed analysis. The images…