Search Publications
Kinematics and excitation of the nuclear spiral in the active galaxy Arp 102B
Robinson, Andrew; Axon, David J.; Storchi-Bergmann, Thaisa +3 more
We present a two-dimensional analysis of the gaseous excitation and kinematics of the inner 2.5 × 1.7 kpc2 of the low-ionization nuclear emission-line region (LINER)/Seyfert 1 galaxy Arp 102B, from optical spectra obtained with the Gemini Multi-Object Spectrograph Integral Field Unit on the Gemini North telescope at a spatial resolution…
The origin of blueshifted absorption features in the X-ray spectrum of PG 1211+143: outflow or disc.
Fabian, A. C.; Gallo, L. C.
In some radio-quiet active galactic nuclei (AGN), high-energy absorption features in the X-ray spectra have been interpreted as ultrafast outflows (UFOs) - highly ionized material (e.g. Fe XXV and Fe XXVI) ejected at mildly relativistic velocities. In some cases, these outflows can carry energy in excess of the binding energy of the host galaxy. N…
Dynamical and physical properties of 22 binaries discovered by W. S. Finsen
Docobo, J. A.; Andrade, M.
Using recent speckle measurements performed by different observers, in this paper we present revised orbital elements and dynamical masses for the binaries WDS 02396-1152 (FIN 312), 04515-3454 (FIN 320), 06253+0130 (FIN 343), 07003-2207 (FIN 334 Aa,Ab), 08291-4756 (FIN 315 Aa,Ab), 08345-3236 (FIN 335), 09173-6841 (FIN 363 AB), 09442-2746 (FIN 326)…
The Herschel Fornax Cluster Survey - I. The bright galaxy sample
Ciesla, L.; Bianchi, S.; Fritz, J. +18 more
We present Herschel Space Telescope observations of the nearby Fornax cluster at 100, 160, 250, 350 and 500 µm with a spatial resolution of 7-36 arcsec (10 arcsec ≈ 1 kpc at dFornax = 17.9 Mpc). We define a sample of 11 bright galaxies, selected at 500 µm, that can be directly compared with our past work on the Virgo cluster…
Ultracompact dwarfs around NGC 3258 in the Antlia cluster
Richtler, Tom; Faifer, Favio R.; Smith Castelli, Analía V. +2 more
We present the first compact stellar systems with luminosities in the range of ultracompact dwarfs (UCDs), discovered in the Antlia galaxy cluster (-10.5 < MV < -11.6). The magnitude limit between UCDs and globular clusters (CGs) is discussed. By means of imaging from VLT (FORS1), CTIO (MOSAIC) and the Hubble Space Telescope (ACS)…
A Suzaku X-ray observation of one orbit of the supergiant fast X-ray transient IGR J16479-4514
Tomsick, J. A.; Rodriguez, J.; Sidoli, L. +6 more
We report on a 250 ks long X-ray observation of the supergiant fast X-ray transient IGR J16479-4514 performed with Suzaku in 2012 February. During this observation, about 80 per cent of the short orbital period (Porb ∼ 3.32 d) was covered as continuously as possible for the first time. The source light curve displays variability of more…
Age dating stellar populations in the near infrared: an absolute age indicator from the presence/absence of red supergiants.
Bastian, N.; Adamo, A.; Urbaneja, M. A. +4 more
The determination of age is a critical component in the study of a population of stellar clusters. In this Letter, we present a new absolute age indicator for young massive star clusters based on J-H colour. This novel method identifies clusters as older or younger than 5.7 ± 0.8 Myr based on the appearance of the first population of red supergian…
Ripping apart at the seams: the network of stripped gas surrounding M86
Finoguenov, A.; Simionescu, A.; Allen, S. W. +4 more
We present a new study of the Virgo Cluster galaxies M86, M84, NGC 4338 and NGC 4438 using a mosaic of five separate pointings with XMM-Newton. Our observations allow for robust measurements of the temperature and metallicity structure of each galaxy along with the entire ∼1° region between these galaxies. When combined with multiwavelength observ…
Orbital and evolutionary constraints on the planet hosting binary GJ 86 from the Hubble Space Telescope
Bond, Howard E.; Barstow, M. A.; Holberg, J. B. +5 more
This paper presents new observations of the planet-hosting, visual binary GJ 86 (HR 637) using the Hubble Space Telescope. Ultraviolet and optical imaging with WFC3 confirms the stellar companion is a degenerate star and indicates the binary semimajor axis is larger than previous estimates, with a ≳ 28 au. Optical STIS spectroscopy of the secondar…
A z = 3.045 Lyα emitting halo hosting a QSO and a possible candidate for AGN-triggered star formation.
Carswell, R. F.; Rauch, M.; Becker, G. D. +2 more
In this third paper in a series on the nature of extended, asymmetric Lyα emitters at z ∼ 3 we report the discovery, in an ultra-deep, blind, spectroscopic long-slit survey, of a Lyα emitting halo around a QSO at redshift 3.045. The QSO is a previously known, obscured active galactic nucleus (AGN). The Lyα emitting halo appears extended along the …