Search Publications
Constraining globular cluster formation through studies of young massive clusters - III. A lack of gas and dust in massive stellar clusters in the LMC and SMC
Bastian, N.; Strader, J.
Scenarios that invoke multiple episodes of star formation within young globular clusters (GCs) to explain the observed chemical and photometric anomalies in GCs require that clusters can retain the stellar ejecta of the stars within them and accrete large amounts of gas from their surroundings. Hence, it should be possible to find young massive cl…
A comparative study of local galaxy clusters - I. Derived X-ray observables
Bartlett, J. G.; Rykoff, E. S.; Rozo, E. +1 more
We examine systematic differences in the derived X-ray properties of galaxy clusters as reported by three different groups: Vikhlinin et al., Mantz et al. and Plank Collaboration. The sample overlap between any two pairs of works ranges between 16 to 28 galaxy clusters. We find systematic differences in most reported X-ray properties, including th…
Star formation in the massive cluster merger Abell 2744
Okabe, N.; Altieri, B.; Valtchanov, I. +8 more
We present a comprehensive study of star-forming (SF) galaxies in the Hubble Space Telescope (HST) Frontier Field recent cluster merger A2744 (z = 0.308). Wide-field, ultraviolet-infrared (UV-IR) imaging enables a direct constraint of the total star formation rate (SFR) for 53 cluster galaxies, with SFRUV+IR = 343 ± 10 M⊙ yr<…
The GEEC2 spectroscopic survey of Galaxy groups at 0.8 < z < 1
Mulchaey, John S.; Balogh, Michael L.; Finoguenov, Alexis +6 more
We present the data release of the Gemini-South GMOS spectroscopy in the fields of 11 galaxy groups at 0.8 < z < 1, within the COSMOS field. This forms the basis of the Galaxy Environment Evolution Collaboration 2 (GEEC2) project to study galaxy evolution in haloes with M ∼ 1013 M⊙ across cosmic time. The final sample i…
The Spitzer Local Volume Legacy (LVL) global optical photometry
Johnson, Benjamin D.; Calzetti, Daniela; Kennicutt, Robert C. +6 more
We present the global optical photometry of 246 galaxies in the Local Volume Legacy (LVL) survey. The full volume-limited sample consists of 258 nearby (D < 11 Mpc) galaxies whose absolute B-band magnitude span a range of -9.6 < MB < -20.7 mag. A composite optical (UBVR) data set is constructed from observed UBVR and Sloan Digi…
A comparative study of local galaxy clusters - II. X-ray and SZ scaling relations
Bartlett, J. G.; Rykoff, E. S.; Evrard, A. E. +1 more
We compare cluster scaling relations published for three different samples selected via X-ray and Sunyaev-Zel'dovich (SZ) signatures. We find tensions driven mainly by two factors: (i) systematic differences in the X-ray cluster observables used to derive the scaling relations and (ii) uncertainty in the modelling of how the gas mass of galaxy clu…
Cold gas dynamics in Hydra-A: evidence for a rotating disc
Fabian, A. C.; Swinbank, A. M.; Combes, F. +15 more
We present multifrequency observations of the radio galaxy Hydra-A (3C218) located in the core of a massive, X-ray luminous galaxy cluster. Integral field unit spectroscopy is used to trace the kinematics of the ionized and warm molecular hydrogen which are consistent with an ∼5 kpc rotating disc. Broad, double-peaked lines of CO(2-1), [C II] 157 …
Spectroscopic evidence for a low-mass black hole in SWIFT J1753.5-0127
Tsygankov, Sergey S.; Poutanen, Juri; Kajava, Jari J. E. +4 more
The black hole (BH) candidate SWIFT J1753.5-0127 has remained active since the onset of its 2005 outburst. Emission lines in the optical spectrum were observed at the very beginning of the outburst, but since then the spectrum has been featureless making a precise BH mass estimation impossible. Here we present results from our optical and ultravio…
A treatment procedure for Gemini North/NIFS data cubes: application to NGC 4151
Ricci, T. V.; Steiner, J. E.; Menezes, R. B.
We present a detailed procedure for treating data cubes obtained with the Near-Infrared Integral Field Spectrograph (NIFS) of the Gemini North telescope. This process includes the following steps: correction of the differential atmospheric refraction, spatial re-sampling, Butterworth spatial filtering, `instrumental fingerprint' removal and Richar…
Feeding versus feedback in NGC 1068 probed with Gemini NIFS - I. Excitation
Storchi-Bergmann, Thaisa; Riffel, Rogemar A.; McGregor, Peter J. +1 more
We present emission-line flux distributions and ratios for the inner ≈200 pc of the narrow-line region (NLR) of the Seyfert 2 galaxy NGC 1068, using observations obtained with the Gemini Near-infrared Integral Field Spectrograph (NIFS) in the J, H and K bands at a spatial resolution of ≈10 pc and spectral resolution of ≈5300. The molecular gas emi…