Search Publications
Exploring the nuclear environment of the NLS1 galaxy Arakelian 564 with XMM-Newton RGS
Page, M. J.; Branduardi-Raymont, G.; Smith, R. A. N.
Aims: We present an accurate characterisation of the high-resolution X-ray spectrum of the Narrow Line Seyfert 1 galaxy Arakelian 564 and put it in to context with other objects of its type by making a detailed comparison of their spectra.
Methods: The data are taken from 5 observations with the XMM-Newton Reflection Grating Spectrometer and f…
Large-scale horizontal flows in the solar photosphere. II. Long-term behaviour and magnetic activity response
Švanda, M.; Sobotka, M.; Klvaňa, M. +1 more
We have developed a method to map large-scale horizontal velocity fields in the solar photosphere. The method was developed, tuned, and calibrated using synthetic data. Now, we apply the method to the series of Michelson Doppler Imager (MDI) Dopplergrams covering almost one solar cycle to generate the information about the long-term behaviour of s…
In search of RR Lyrae type stars in eclipsing binary systems. OGLE052218.07-692827.4: an optical blend
Prša, A.; Guinan, E. F.; Devinney, E. J. +1 more
During the OGLE-2 operation, Soszynski et al. (2003) found 3 LMC candidates for an RR Lyr-type component in an eclipsing binary system. Two of those have orbital periods that are too short to be physically plausible and hence have to be optical blends. For the third, OGLE052218.07-692827.4, we developed a model of the binary that could host the ob…
GRB 070707: the first short gamma-ray burst observed by INTEGRAL
McGlynn, S.; McBreen, S.; Foley, S. +4 more
Context: INTEGRAL has observed 47 long-duration GRBs (T90 ≳ 2 s) and 1 short-duration GRB (T90 ≲ 2 s) in five years of observation since October 2002.
Aims: This work presents the properties of the prompt emission of GRB 070707, which is the first short hard GRB observed by INTEGRAL.
Methods: The spectral and temporal…
H I and CO in the circumstellar environment of the oxygen-rich AGB star RX Leporis
Winters, J. M.; Le Bertre, T.; Libert, Y. +1 more
Context: Circumstellar shells around AGB stars are built over long periods of time that may reach several million years. They may therefore be extended over large sizes ( 1 pc, possibly more), and different complementary tracers are needed to describe their global properties.
Aims: We set up a program to explore the properties of matter in the…
The efficient low-mass Seyfert MCG-05-23-016
Gehrels, N.; Petrucci, P. -O.; Shrader, C. R. +5 more
Aims: The Seyfert 1.9 galaxy MCG-05-23-016 has been shown to exhibit a complex X-ray spectrum. This source has moderate X-ray luminosity, hosts a comparably low-mass black hole, but accretes at a high Eddington rate, and allows us to study a super massive black hole in an early stage.
Methods: Three observations of the INTEGRAL satellite simul…
Central K-band kinematics and line strength maps of NGC 1399
Kuntschner, H.; Silva, D. R.; Lyubenova, M.
In this paper we present for the first time high spatial resolution K-band maps of the central kinematical and near-infrared spectral properties of the giant cD galaxy in the Fornax cluster, NGC 1399. We confirm the presence of a central velocity dispersion dip within r ≤ 0.2 arcsec seen in previous long-slit studies. Our velocity dispersion maps …
Bulges of disk galaxies at intermediate redshifts. II. Nuclear, disk, and global colors in the Groth Strip
Balcells, Marc; Domínguez-Palmero, Lilian
Context: The chronology of bulge and disk formation is a major unsolved issue in galaxy formation, which impacts on our global understanding of the Hubble sequence.
Aims: We analyse colours of the nuclear regions of intermediate redshift disk galaxies, with the aim of obtaining empirical information of relative ages of bulges and disks at 0.1 …
Structures in surface-brightness profiles of LMC and SMC star clusters: evidence of mergers?
Bonatto, C.; Bica, E.; Carvalho, L. +2 more
Context: The LMC and SMC are rich in binary star clusters, and some mergers are expected. It is thus important to characterise single clusters, binary clusters and candidates for mergers.
Aims: We selected a sample of star clusters in each Cloud with this aim. Surface photometry of 25 SMC and 22 LMC star clusters was carried with the ESO Danis…
XMM-Newton observations of 4 luminous radio-quiet AGN, and the soft X-ray excess problem
Bianchi, S.; Jiménez-Bailón, E.; Matt, G. +1 more
Context: The nature and origin of the soft X-ray excess in radio-quiet AGN is still an open issue. The interpretation in terms of thermal disc emission has been challanged by the discovery of the constancy of the effective temperature despite the wide range of Black Hole masses of the observed sources. Alternative models are reflection from ionize…