Search Publications
The interstellar medium in Andromeda's dwarf spheroidal galaxies - I. Content and origin of the interstellar dust
De Looze, Ilse; Baes, Maarten; Bendo, George J. +8 more
Dwarf spheroidal galaxies are among the most numerous galaxy population in the Universe, but their main formation and evolution channels are still not well understood. The three dwarf spheroidal satellites (NGC 147, NGC 185, and NGC 205) of the Andromeda galaxy are characterized by very different interstellar medium properties, which might suggest…
Dark matter fraction of low-mass cluster members probed by galaxy-scale strong lensing
Grillo, C.; Balestra, I.; Rosati, P. +8 more
We present a strong lensing system, composed of four multiple images of a source at z = 2.387, created by two lens galaxies, G1 and G2, belonging to the galaxy cluster MACS J1115.9+0129 at z = 0.353. We use observations taken as part of the Cluster Lensing and Supernova survey with Hubble, and its spectroscopic follow-up programme at the Very Larg…
The circumstellar disc of FS Tau B - a self-consistent model based on observations in the mid-infrared with NACO
Kirchschlager, Florian; Wolf, Sebastian; Madlener, David
Protoplanetary discs are a byproduct of the star formation process. In the dense mid-plane of these discs, planetesimals and planets are expected to form. The first step in planet formation is the growth of dust particles from submicrometre-sized grains to macroscopic mm-sized aggregates. The grain growth is accompanied by radial drift and vertica…
The dust properties and physical conditions of the interstellar medium in the LMC massive star-forming complex N11
Lebouteiller, V.; Madden, S. C.; Galliano, F. +19 more
We combine Spitzer and Herschel data of the star-forming region N11 in the Large Magellanic Cloud (LMC) to produce detailed maps of the dust properties in the complex and study their variations with the interstellar-medium conditions. We also compare Atacama Pathfinder EXperiment/Large APEX Bolometer Camera (APEX/LABOCA) 870 µm observations …
High-energy properties of the high-redshift flat spectrum radio quasar PKS 2149-306
D'Ammando, F.; Orienti, M.
We investigate the γ-ray and X-ray properties of the flat spectrum radio quasar PKS 2149-306 at redshift z = 2.345. A strong γ-ray flare from this source was detected by the Large Area Telescope on board the Fermi Gamma-ray Space Telescope satellite in 2013 January, reaching on January 20 a daily peak flux of (301 ± 36) × 10-8 ph cm
A newly discovered radio halo in merging cluster MACS J2243.3-0935
Han, J. L.; Wen, Z. L.; Oozeer, N. +2 more
We report the discovery of a radio halo in the massive merging cluster MACSJ2243.3-0935, as well as a new radio relic candidate, using the Giant Meterwave Radio Telescope and the Karoo Array Telescope-7 telescope. The radio halo is coincident with the cluster X-ray emission and has a largest linear scale of approximately 0.9 Mpc. We measure a flux…
The pulsating variable star population in DDO210
Sarajedini, Ata; Ordoñez, Antonio J.
We have probed the pulsating variable star content of the isolated Local Group dwarf galaxy, DDO210 (Aquarius), using archival Advanced Camera for Surveys/Hubble Space Telescope imaging in the F475W and F814W passbands. We find a total of 32 RR Lyrae stars (24 ab-type; 8 c-type) and 75 Cepheid variables. The mean periods of the ab-type and c-type …
Period-Luminosity relations derived from the OGLE-III first-overtone mode Cepheids in the Magellanic Clouds
Ngeow, Chow-Choong; Kanbur, Shashi M.; Bhardwaj, Anupam +1 more
We present multiband Period-Luminosity (PL) relations for first-overtone mode Cepheids in the Small Magellanic Cloud (SMC). We derive optical band PL relations and the Wesenheit function using VI mean magnitudes from the Optical Gravitational Lensing Experiment (OGLE-III) survey. We cross-match OGLE-III first-overtone mode Cepheids to the 2MASS an…
The SLUGGS survey: chromodynamical modelling of the lenticular galaxy NGC 1023
Cortesi, Arianna; Chies-Santos, Ana L.; Forbes, Duncan A. +12 more
Globular clusters (GCs) can be considered discrete, long-lived, dynamical tracers that retain crucial information about the assembly history of their parent galaxy. In this paper, we present a new catalogue of GC velocities and colours for the lenticular galaxy NGC 1023, we study their kinematics and spatial distribution, in comparison with the un…
Broad-band X-ray emission and the reality of the broad iron line from the neutron star-white dwarf X-ray binary 4U 1820-30
Misra, R.; Dewangan, G. C.; Mondal, Aditya S. +3 more
Broad relativistic iron lines from neutron star X-ray binaries are important probes of the inner accretion disc. The X-ray reflection features can be weakened due to strong magnetic fields or very low iron abundances such as is possible in X-ray binaries with low mass, first generation stars as companions. Here, we investigate the reality of the b…