Search Publications
Metal transport by gas sloshing in M87
Böhringer, H.; Simionescu, A.; Churazov, E. +5 more
We present the results of an XMM-Newton mosaic covering the central ~200kpc of the nearby Virgo cluster. We focus on a strong surface brightness discontinuity in the outskirts of the brightest cluster galaxy (BCG), M87. Using both XMM-Newton and Suzaku, we derive accurate temperature and metallicity profiles across this feature and show that it is…
Quantifying dwarf satellites through gravitational imaging: the case of SDSSJ120602.09+514229.5
Czoske, Oliver; Koopmans, Léon V. E.; Vegetti, Simona
SDSSJ120602.09+514229.5 is a gravitational lens system formed by a group of galaxies at redshift zFG = 0.422 lensing a bright background galaxy at redshift zBG = 2.001. The main peculiarity of this system is the presence of a luminous satellite near the Einstein radius, which slightly deforms the giant arc. This makes SDSSJ12…
Excess AGN activity in the z = 2.30 Protocluster in HS 1700+64
Georgakakis, A.; Nandra, K.; Aird, J. +7 more
We present the results of spectroscopic, narrow-band and X-ray observations of a z = 2.30 protocluster in the field of the QSO HS 1700+643. Using a sample of BX/MD galaxies, which are selected to be at z ~ 2.2-2.7 by their rest-frame ultraviolet colours, we find that there are five protocluster AGN which have been identified by characteristic emis…
IC 2602: a lithium depletion boundary age and new candidate low-mass stellar members
Sharp, R. G.; Lodieu, N.; Dobbie, P. D.
We report the results from a photometric and spectroscopic survey of ∼1.4 deg2 of the young open cluster IC 2602. Fourteen objects have been identified as having magnitudes, spectral types and radial velocities consistent with being probable or possible low-mass stellar members of the cluster. We have used the observed location of the l…
Towards a fully consistent Milky Way disc model - I. The local model based on kinematic and photometric data
Jahreiß, H.; Just, A.
We present a fully consistent evolutionary disc model of the solar cylinder. The model is based on a sequence of stellar subpopulations described by the star formation history (SFR) and the dynamical heating law [given by the age-velocity dispersion relation (AVR)]. The stellar subpopulations are in dynamical equilibrium and the gravitational pote…
Clumpy galaxies at z ~ 0.6: kinematics, stability and comparison with analogues at other redshifts
Puech, M.
Distant clumpy galaxies are thought to be Jeans-unstable discs and an important channel for the formation of local galaxies, as suggested by recent spatially resolved kinematic observations of z ~ 2 galaxies. I study the kinematics of clumpy galaxies at z ~ 0.6 and compare their properties with those of counterparts at higher and lower redshifts. …
The X-ray spectrum of the newly discovered accreting millisecond pulsar IGR J17511-3057
Papitto, A.; Burderi, L.; Bozzo, E. +5 more
We report on a 70 ks XMM-Newton Target of Opportunity (ToO) observation of the newly discovered accreting millisecond pulsar, IGR J17511-3057. Pulsations at 244.8339512(1)Hz are observed throughout the outburst with an rms-pulsed fraction of 14.4(3) per cent. Pulsations have been used to derive a precise solution for the Porb = 12487.51…
Galaxy group at z = 0.3 associated with the damped Lyman α system towards quasar Q1127-145
Kacprzak, Glenn G.; Churchill, Christopher W.; Murphy, Michael T.
We performed a spectroscopic galaxy survey, complete to mF814W <= 20.3 (LB > 0.15L*B at z = 0.3), within 100 × 100 arcsec2 of the quasar Q1127-145 (zem = 1.18). The Very Large Telescope/Ultraviolet and Visual Echelle Spectrograph (UVES) quasar spectrum contains three zabs…
The helium spread in the globular cluster 47 Tuc
D'Antona, F.; Ventura, P.; Piotto, G. +2 more
Spectroscopy has shown the presence of CN band dichotomy and Na-O anticorrelations for 50-70 per cent of the investigated samples in the cluster 47 Tuc, otherwise considered a `normal' prototype of high-metallicity clusters from its photometric analysis. These anomalies are also found in main-sequence stars, suggesting that a consistent second gen…
Near-infrared dust and line emission from the central region of Mrk1066: constraints from Gemini NIFS
Storchi-Bergmann, Thaisa; Nagar, Neil M.; Riffel, Rogemar A.
We present integral field spectroscopy of the inner 700 × 700pc2 of the Seyfert galaxy Mrk1066 obtained with Gemini's Near-Infrared Integral Field Spectrograph (NIFS) at a spatial resolution of ~35pc. This high spatial resolution allowed us to observe, for the first time in this galaxy, an unresolved dust concentration with mass ~1.4 × …