Search Publications
Confirming a population of hot-dust dominated, star-forming, ultraluminous galaxies at high redshift
Muxlow, T. W. B.; Ivison, R. J.; Smail, Ian +6 more
We identify eight z > 1 radio sources undetected at 850 µm but robustly detected at 70 µm, confirming that they represent ultraluminous infrared galaxies (ULIRGs) with hotter dust temperatures (<Td> = 52 +/- 10K) than submillimetre galaxies (SMGs) at similar luminosities and redshifts. These galaxies share many prop…
Ultraviolet Spectroscopy of Supernovae: The First Two Years of Swift Observations
Panagia, N.; Pian, E.; Gehrels, N. +13 more
We present the entire sample of ultraviolet (UV) spectra of supernovae (SNe) obtained with the Ultraviolet/Optical Telescope (UVOT) on board the Swift satellite during the first two years of observations (2005/2006). A total of 29 UV-grism and 22 V-grism spectra of nine SNe have been collected, of which six are thermonuclear (Type Ia) and three co…
STAGES: the Space Telescope A901/2 Galaxy Evolution Survey
Papovich, Casey; Bell, Eric F.; Johnson, Benjamin D. +26 more
We present an overview of the Space Telescope A901/2 Galaxy Evolution Survey (STAGES). STAGES is a multiwavelength project designed to probe physical drivers of galaxy evolution across a wide range of environments and luminosity. A complex multicluster system at z ~ 0.165 has been the subject of an 80-orbit F606W Hubble Space Telescope (HST)/Advan…
Automated Detection of Galaxy-Scale Gravitational Lenses in High-Resolution Imaging Data
Bradač, Maruša; Hogg, David W.; Marshall, Philip J. +4 more
We expect direct lens modeling to be the key to successful and meaningful automated strong galaxy-scale gravitational lens detection. We have implemented a lens-modeling "robot" that treats every bright red galaxy (BRG) in a large imaging survey as a potential gravitational lens system. Having optimized a simple model for "typical" galaxy-scale gr…
A VLT VIMOS study of the anomalous BCD Mrk996: mapping the ionized gas kinematics and abundances
Tsamis, Y. G.; Walsh, J. R.; Barlow, M. J. +4 more
A study of the blue compact dwarf (BCD) galaxy Mrk996 based on high-resolution optical Very Large Telescope Visible Multi-Object Spectrograph integral field unit spectroscopy is presented. Mrk996 displays multicomponent line emission, with most line profiles consisting of a narrow, central Gaussian [full width at half-maximum (FWHM) ~ 110kms-…
The radial distribution of the two stellar populations in NGC 1851
Salaris, M.; Anderson, J.; Milone, A. P. +4 more
We have analyzed ACS/WFC and WFPC2 images from HST, as well as ground-based data to study the radial distribution of the double sub-giant branch (SGB) recently discovered in the Galactic globular cluster NGC 1851. We found that the SGB split can be followed all the way from the cluster center out to at least 8´ from the center. Beyond this distanc…
The Expanding Nebular Remnant of the Recurrent Nova RS Ophiuchi (2006). II. Modeling of Combined Hubble Space Telescope Imaging and Ground-based Spectroscopy
Chavushyan, V. H.; Zharikov, S. V.; Eyres, S. P. S. +16 more
We report Hubble Space Telescope (HST) imaging, obtained 155 and 449 days after the 2006 outburst of the recurrent nova RS Ophiuchi, together with ground-based spectroscopic observations, obtained from the Observatorio Astronómico Nacional en San Pedro Mártir, Baja California, México and at the Observatorio Astrofísico Guillermo Haro, at Cananea, …
The INTEGRAL complete sample of type 1 AGN
de Rosa, A.; Bird, A. J.; Landi, R. +6 more
In this paper we discuss the broad-band X-ray characteristics of a complete sample of 36 type 1 active galactic nuclei (AGN), detected by INTEGRAL in the 20-40keV band above the 5.5σ level. We present, for all the objects in the sample, the broad-band (1-110keV) spectral analysis obtained by using INTEGRAL/Swift/Burst Alert Telescope observations …
Unveiling the nature of INTEGRAL objects through optical spectroscopy. VII. Identification of 20 Galactic and extragalactic hard X-ray sources
Palazzi, E.; Minniti, D.; Masetti, N. +17 more
Within the framework of our program of assessment of the nature of unidentified or poorly known INTEGRAL sources, we present here spectroscopy of optical objects, selected through positional cross-correlation with soft X-ray detections (afforded with satellites such as Swift, ROSAT, Chandra and/or XMM-Newton) as putative counterparts of hard X-ray…
Automated detection of EUV Polar Coronal Holes during Solar Cycle 23
Hess Webber, S. A.; Pesnell, W. D.; Young, C. A. +1 more
A new method for automated detection of polar coronal holes is presented. This method, called perimeter tracing, uses a series of 171, 195, and 304 Å full disk images from the Extreme ultraviolet Imaging Telescope (EIT) on SOHO over solar cycle 23 to measure the perimeter of polar coronal holes as they appear on the limbs. Perimeter tracing minimi…