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The Local Group dwarf Leo T: HI on the brink of star formation
Emma V. Ryan-Weber, Ayesha Begum, Tom Oosterloo +5
We present Giant Meterwave Radio Telescope (GMRT) and Westerbork ynthesis Radio Telescope (WSRT) observations of the recently discovered Local Group dwarf galaxy, Leo T. The peak H…
Near-infrared cross-dispersed spectroscopy of brown dwarf candidates in the Upper Sco association
N. Lodieu, N. C. Hambly, R. F. Jameson +1
We present near-infrared (1.15-2.50 microns) medium-resolution (R = 1700) spectroscopy of a sample of 23 brown dwarf candidates in the young Upper Sco association. We confirm membe…
A Homogeneous Sample of Sub-DLAs IV: Global Metallicity Evolution
Celine Peroux, Miroslava Dessauges-Zavadsky, Sandro D'Odorico +2
An accurate method to measure the abundance of high-redshift galaxies consists in the observation of absorbers along the line of sight toward a background quasar. Here, we present…
The LuckyCam Survey for Very Low Mass Binaries II: 13 new M4.5-M6.0 Binaries
N. M. Law, S. T. Hodgkin, C. D. Mackay
We present results from a high-angular-resolution survey of 78 very low mass (VLM) binary systems with 6.0 <= V-K colour <= 7.5 and proper motion >= 0.15 arcsec/yr. 21 VLM binaries…
The First Appearance of the Red Sequence of Galaxies in Proto-Clusters at 2<~z<~3
T. Kodama, I. Tanaka, M. Kajisawa +5
We explore the evolved galaxy population in the proto-clusters around four high-z radio galaxies at 2<~z<~3 based on wide-field near-infrared imaging. Three of the four fields are…
A longer XMM-Newton look at I Zwicky 1: physical conditions and variability of the ionised absorbers
E. Costantini, L. C. Gallo, W. N. Brandt +2
We present a spectral analysis of the narrow-line Seyfert 1 galaxy I Zwicky 1, focusing on the characteristics of the ionised absorbers as observed with XMM-Newton in 2005. The sof…