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Optical and near-infrared IFU spectroscopy of the nuclear region of the AGN-starburst galaxy NGC 7582
Ricci, T. V.; Steiner, J. E.; May, D. +2 more
NGC 7582 is an SB(s)ab galaxy which displays evidences of simultaneous nuclear activity and star formation in its centre. Previous optical observations revealed, besides the H II regions, an ionization cone and a gas disc in its central part. Hubble Space Telescope (HST) images in both optical and infrared bands show the active galactic nuclei (AG…
Tracing the assembly history of NGC 1395 through its Globular Cluster System
Forte, Juan C.; Faifer, Favio R.; González, Nélida M. +4 more
We used deep Gemini-South/GMOS g΄r΄i΄z΄ images to study the globular cluster (GC) system of the massive elliptical galaxy NGC 1395, located in the Eridanus supergroup. The photometric analysis of the GC candidates reveals a clear colour bimodality distribution, indicating the presence of `blue' and `red'…
A deep near-infrared spectroscopic survey of the Scutum-Crux arm for Wolf-Rayet stars
Crowther, Paul A.; Rosslowe, C. K.
We present a New Technology Telescope/Son-of-Isaac spectroscopic survey of infrared selected Wolf-Rayet (WR) candidates in the Scutum-Crux spiral arm (298° ≤ l ≤ 340°, |b| ≤ 0.5°. We obtained near-IR spectra of 127 candidates, revealing 17 WR stars - a ∼13 per cent success rate - of which 16 are newly identified here. The majority of the new WR st…
The second Herschel-ATLAS Data Release - III. Optical and near-infrared counterparts in the North Galactic Plane field
Ivison, R. J.; Ibar, E.; Dunne, L. +8 more
This paper forms part of the second major public data release of the Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS). In this work, we describe the identification of optical and near-infrared counterparts to the submillimetre detected sources in the 177 deg2 North Galactic Plane (NGP) field. We used the likelihood ratio met…
GRAWITA: VLT Survey Telescope observations of the gravitational wave sources GW150914 and GW151226
Covino, S.; D'Avanzo, P.; Campana, S. +50 more
We report the results of deep optical follow-up surveys of the first two gravitational-wave sources, GW150914 and GW151226, done by the GRAvitational Wave Inaf TeAm Collaboration (GRAWITA). The VLT Survey Telescope (VST) responded promptly to the gravitational wave alerts sent by the LIGO and Virgo Collaborations, monitoring a region of 90 and 72 …
Discovery of WASP-174b: Doppler tomography of a near-grazing transit
Bouchy, F.; Queloz, D.; Ségransan, D. +23 more
We report the discovery and tomographic detection of WASP-174b, a planet with a near-grazing transit on a 4.23-d orbit around a V= 11.9, F6V star with [Fe/H] = 0.09 ± 0.09. The planet is in a moderately misaligned orbit with a sky-projected spin-orbit angle of λ = 31° ± 1°. This is in agreement with the known tendency for orbits around hotter star…
Hubble Tarantula Treasury Project - VI. Identification of pre-main-sequence stars using machine-learning techniques
Gouliermis, Dimitrios A.; Anderson, Jay; Grebel, Eva K. +9 more
The Hubble Tarantula Treasury Project (HTTP) has provided an unprecedented photometric coverage of the entire starburst region of 30 Doradus down to the half Solar mass limit. We use the deep stellar catalogue of HTTP to identify all the pre-main-sequence (PMS) stars of the region, i.e. stars that have not started their lives on the main-sequence …
Large-scale three-dimensional Gaussian process extinction mapping
Sale, S. E.; Magorrian, J.
Gaussian processes (GPs) are the ideal tool for modelling the Galactic interstellar medium, combining statistical flexibility with a good match to the underlying physics. In an earlier paper, we outlined how they can be employed to construct three-dimensional maps of dust extinction from stellar surveys. GPs scale poorly to large data sets though,…
SMBH accretion properties of radio-selected AGN out to z ∼ 4
Bondi, M.; Smolčić, V.; Alexander, D. M. +8 more
Exploring how radio-emitting active galactic nuclei (AGNs) behave and evolve with time is critical for understanding how AGN feedback impacts galaxy evolution. In this work, we investigate the relationship between 1.4 GHz radio continuum AGN luminosity (L^AGN_1.4), specific black hole accretion rate (s-BHAR, defined as the accretion luminosity rel…
Proper motion of the Sextans dwarf galaxy from Subaru Suprime-Cam data
Casetti-Dinescu, Dana I.; Girard, Terrence M.; Schriefer, Michael
We have measured the absolute proper motion of the Sextans dwarf spheroidal galaxy using Subaru Suprime-Cam images taken at three epochs, with a time baseline of ∼10 yr. We astrometrically calibrate each epoch by constructing distortion-correction 'maps' from the best available Subaru Suprime-Cam dithered data sets and from Gaia Data Release 1 pos…