Search Publications
The WEBT campaign on the BL Lac object PG 1553+113 in 2013. An analysis of the enigmatic synchrotron emission
Lähteenmäki, A.; Umana, G.; Giroletti, M. +59 more
A multifrequency campaign on the BL Lac object PG 1553+113 was organized by the Whole Earth Blazar Telescope (WEBT) in 2013 April-August, involving 19 optical, two near-IR, and three radio telescopes. The aim was to study the source behaviour at low energies during and around the high-energy observations by the Major Atmospheric Gamma-ray Imaging …
Study of morphology and stellar content of the Galactic H II region IRAS 16148-5011
Tamura, M.; Samal, M. R.; Ojha, D. K. +3 more
An investigation of the IRAS 16148-5011 region - a cluster at a distance of 3.6 kpc - is presented here, carried out using multiwavelength data in near-infrared (NIR) from the 1.4 m Infrared Survey Facility telescope, mid-infrared (MIR) from the archival Spitzer GLIMPSE (Galactic Legacy Infrared Midplane Survey Extraordinaire) survey, far-infrared…
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 …