Search Publications
Formation and evolution of late-type dwarf galaxies - I. NGC1705 and NGC1569
Matteucci, Francesca; Tosi, Monica; Romano, Donatella
We present one-zone chemical evolution models for two dwarf starburst galaxies, NGC1705 and NGC1569. Though especially designed for the inner ~1 kpc region, where numerous HII regions and most of the stars are observed, the models also account for the presence of extended gaseous and dark matter haloes, and properly compute the binding energy of t…
An ultradeep submillimetre map: beneath the SCUBA confusion limit with lensing and robust source extraction
Smail, I.; Kneib, J. -P.; Ivison, R. J. +7 more
Extracting sources with low signal-to-noise ratio (S/N) from maps with structured background is a non-trivial task which has become important in studying the faint end of the submillimetre (submm) number counts. In this paper, we study the source extraction from submm jiggle-maps from the Submillimetre Common-User Bolometer Array (SCUBA) using the…
An imaging study of the globular cluster systems of NGC 1407 and 1400
Forbes, Duncan A.; Brodie, Jean P.; Strader, Jay +3 more
We present wide-field Keck telescope imaging of the globular cluster (GC) systems around NGC 1407 and 1400 in the Eridanus galaxy cloud. This is complemented by Hubble Space Telescope (HST) images from the Advanced Camera for Surveys of NGC 1407 and Wide Field and Planetary Camera 2 images of NGC 1400. We clearly detect bimodality in the GC colour…
The Tully-Fisher relation of distant field galaxies
Milvang-Jensen, B.; Aragón-Salamanca, A.; Bamford, S. P.
We examine the evolution of the Tully-Fisher relation (TFR) using a sample of 89 field spirals for which we have measured confident rotation velocities (Vrot). This sample covers the redshift range 0.1 <~z<~ 1, with a median of <z>= 0.33. The best-fitting TFR has a slope consistent with that measured locally, and we find no …
High-metallicity, photoionized gas in intergalactic large-scale filaments
Frye, Brenda L.; Bowen, David V.; Tripp, Todd M. +3 more
We present high-resolution ultraviolet spectra of absorption-line systems towards the low-z quasi-stellar object (QSO) HS 0624+6907 (zQSO= 0.3700). Coupled with ground-based imaging and spectroscopic galaxy redshifts, we find evidence that many of these absorbers do not arise in galaxy haloes but rather are truly intergalactic gas cloud…
On the cross-correlation of sub-mm sources and optically selected galaxies
Mobasher, Bahram; Pope, Alexandra; Scott, Douglas +1 more
Bright submillimetre (sub-mm) galaxies are expected to arise in massive highly biased haloes, and hence exhibit strong clustering. We argue that a valuable tool for measuring these clustering properties is the cross-correlation of sub-mm galaxies with faint optically selected sources. We analyse populations of sub-mm detected and optical galaxies …
A far-infrared molecular and atomic line survey of the Orion KL region
Barlow, M. J.; Cernicharo, J.; Goicoechea, J. R. +8 more
We have carried out a high spectral resolution (λ/Δλ ~ 6800-9700) line survey towards the Orion Kleinmann-Low (KL) cluster from 44 to 188 µm. The observations were taken with the Long Wavelength Spectrometer (LWS) in Fabry-Pérot mode, on board the Infrared Space Observatory (ISO). A total of 152 lines are clearly detected and a further 34 fe…
Photometry of Magellanic Cloud clusters with the Advanced Camera for Surveys - II. The unique LMC cluster ESO 121-SC03
Mackey, A. D.; Gilmore, G. F.; Payne, M. J.
We present the results of photometric measurements from images of the Large Magellanic Cloud (LMC) cluster ESO 121-SC03 taken with the Advanced Camera for Surveys (ACS) on the Hubble Space Telescope. Our resulting colour-magnitude diagram (CMD) reaches 3 mag below the main-sequence turn-off, and represents by far the deepest observation of this cl…
Galaxies under the cosmic microscope: resolved spectroscopy and new constraints on the z = 1 Tully-Fisher relation
Kneib, J. -P.; Smith, Graham P.; Smail, Ian +5 more
We exploit the gravitational potential of massive cluster lenses to probe the emission-line properties of six z = 1 galaxies which appear as highly magnified luminous arcs. Using the Gemini Multi-Object Spectrograph (GMOS) integral field spectrograph together with detailed cluster lens models, we reconstruct the intrinsic morphologies and two-dime…
Where are the sources of the near-infrared background?
Ferrara, Andrea; Salvaterra, Ruben
The observed near-infrared background excess over light from known galaxies is commonly ascribed to redshifted radiation from early, very massive, Population III (Pop III) stars. We show here that this interpretation must be discarded as it largely overpredicts the number of J-dropouts and Lyα emitters in ultradeep field searches. Independently of…