Search Publications

Satellites in the field and lens galaxies: SDSS/COSMOS versus SLACS/CLASS

Mao, S.; Jackson, N.; Li, Cheng +1 more

The incidence of subgalactic level substructures is an important quantity, as it is a generic prediction of high-resolution cold dark matter (CDM) models which is susceptible to observational test. Confrontation of theory with observations is currently in an uncertain state. In particular, gravitational lens systems appear to show evidence for flu…

Malin1: interacting galaxy pair?

Moiseev, A. V.; Reshetnikov, V. P.; Sotnikova, N. Ya.

Malin1 is a unique, extraordinarily large low-surface brightness galaxy. The structure and the origins of the galaxy are poorly understood. The reason for this is the absence of detailed observational data, especially of high-resolution kinematics. In this Letter, we study the stellar kinematics of the inner part (r <= 15 kpc) of Malin1.

W…

Flows along cometary tails in the Helix planetary nebula NGC 7293

Boumis, P.; Meaburn, J.

Previous velocity images which reveal flows of ionized gas along the most prominent cometary tail (from Knot 38) in the Helix planetary nebula are compared with that taken at optical wavelengths with the Hubble Space Telescope and with an image in the emission from molecular hydrogen. The flows from the second most prominent tail from Knot 14 are …

INTEGRAL deep observations of the Small Magellanic Cloud

Haberl, F.; Zezas, A.; Udalski, A. +12 more

Deep observations of the Small Magellanic Cloud (SMC) and region were carried out in the hard X-ray band by the INTEGRAL observatory in 2008-2009. The field of view of the instrument permitted simultaneous coverage of the entire SMC and the eastern end of the Magellanic Bridge. In total, INTEGRAL detected seven sources in the SMC and five in the M…

HerMES: SPIRE detection of high-redshift massive compact galaxies in GOODS-N field

Altieri, B.; Elbaz, D.; Pérez-Fournon, I. +47 more

We have analysed the rest-frame far-infrared properties of a sample of massive (M_* > 10¹¹M_solar) galaxies at 2 <~ z <~ 3 in the Great Observatories Origins Deep Survey-North (GOODS-N) field using the Spectral and Photometric Imaging Receiver (SPIRE) instrument aboard the Herschel Space Observatory. To cond…

Inverse-Compton X-rays from giant radio galaxies at z ~ 1

Fabian, A. C.; Laskar, T.; Blundell, K. M. +1 more

We report XMM-Newton observations of three FR II radio galaxies at redshifts between 0.85 and 1.34, which show extended diffuse X-ray emission within the radio lobes, likely due to inverse-Compton up-scattering of the cosmic microwave background. Under this assumption, through spectrum fitting together with archival Very Large Array radio observat…

A study of the interacting binary V393Scorpii

Mennickent, R. E.; Kołaczkowski, Z.; Graczyk, D. +1 more

We present high-resolution J-band spectroscopy of V393Sco obtained with the Cryogenic High-Resolution Infrared Echelle Spectrograph (CRIRES) at the ESO Paranal Observatory along with a discussion of archival International Ultraviolet Explorer (IUE) spectra and published broad-band magnitudes. The best fit to the spectral energy distribution outsid…

AXJ1749.1-2733 and AXJ1749.2-2725 - the close pair of X-ray pulsars behind the Galactic Centre: an optical identification

Lutovinov, A. A.; Karasev, D. I.; Burenin, R. A.

Two faint X-ray pulsars, AXJ1749.2-2725 and AXJ1749.1-2733, located in the direction of the Galactic Centre, were studied in detail using data from the INTEGRAL, XMM-Newton and Chandra observatories in X-rays, the SOFI/NTT instrument in the infrared and the RTT150 telescope in the optical. X-ray positions of both sources were determined with an un…

Ionized gas outflow in the isolated S0 galaxy NGC 4460

Kaisin, Serafim; Karachentsev, Igor; Moiseev, Alexei

We used integral-field and long-slit spectroscopy to study a bright extended nebulosity recently discovered in the isolated lenticular galaxy NGC 4460 during an Hα survey of nearby galaxies. An analysis of archival Sloan Digital Sky Survey, GALEX and Hubble Space Telescope images indicates that current star formation is entirely concentrated in th…

The low-redshift Lyα forest towards 3C 273

Tripp, Todd M.; Jenkins, Edward B.; Sembach, Kenneth R. +6 more

We present an analysis of the Lyα forest towards 3C 273 from the Space Telescope Imaging Spectrograph at ~7kms^-1 resolution, along with reprocessed data from the Far Ultraviolet Spectroscopic Explorer. The high ultraviolet flux of 3C 273 allows us to probe the weak, low-z absorbers. The main sample consists of 21 HI absorbers that we co…