Search Publications
Strong Hα emission in the young planetary mass companion 2MASS J0249-0557 c
Béjar, V. J. S.; Zapatero Osorio, M. R.; Lodieu, N. +2 more
Aims: Our objective is the optical and near-infrared spectroscopic characterisation of 2MASS J0249-0557 c, a recently discovered young planetary mass companion to the β Pictoris (~25 Myr) member 2MASS J0249-0557.
Methods: Using the Visible and Infrared Survey Telescope for Astronomy Hemisphere Survey and the Two Micron All Sky Survey (2M…
VVV survey near-infrared colour catalogue of known variable stars
Minniti, D.; Saito, R. K.; Catelan, M. +4 more
Context. The Vista Variables in the Via Lactea (VVV) near-infrared variability survey explores some of the most complex regions of the Milky Way bulge and disk in terms of high extinction and high crowding.
Aims: We add a new wavelength dimension to the optical information available at the American Association of Variable Star Observers Inter…
Signatures of UV radiation in low-mass protostars. I. Origin of HCN and CN emission in the Serpens Main region
Harsono, Daniel; Karska, Agata; Tychoniec, Łukasz +6 more
Context. Ultraviolet radiation (UV) influences the physics and chemistry of star-forming regions, but its properties and significance in the immediate surroundings of low-mass protostars are still poorly understood.
Aims: Our aim is to extend the use of the CN/HCN ratio, already established for high-mass protostars, to the low-mass regime to …
Evolution of galaxy scaling relations in clusters at 0.5 < z < 1.5
Böhm, A.; Dannerbauer, H.; Hoyos, C. +4 more
Aims: We present new gas kinematic observations with the OSIRIS instrument at the GTC for galaxies in the Cl1604 cluster system at z ∼ 0.9. These observations together with a collection of other cluster samples at different epochs analyzed by our group are used to study the evolution of the Tully-Fisher, velocity-size, and specific angular mo…
Carbon-chain molecule survey toward four low-mass molecular outflow sources
Li, Di; Qin, S. -L.; Esimbek, Jarken +4 more
We performed a carbon-chain molecule (CCM) survey toward four low-mass outflow sources, IRAS 04181+2655 (I04181), HH211, L1524, and L1598, using the 13.7 m telescope at the Purple Mountain Observatory (PMO) and the 65 m Tian Ma Radio telescope at the Shanghai Observatory. We observed the following hydrocarbons (C2H, C4H, c-C<…
X-ray obscuration from a variable ionized absorber in PG 1114+445
Piconcelli, E.; Gaspari, M.; Tombesi, F. +9 more
Photoionized absorbers of outflowing gas are commonly found in the X-ray spectra of active galactic nuclei. While most of these absorbers are seldom significantly variable, some ionized obscurers have increasingly been found to substantially change their column density on a wide range of timescales. These NH variations are often conside…
LOFAR properties of SILVERRUSH Lyα emitter candidates in the ELAIS-N1 field
Bondi, M.; Prandoni, I.; Wang, L. +12 more
Lyman alpha emitters (LAEs) in the Epoch of Reionization (EoR) offer valuable probes of both early galaxy evolution and the process of reionization itself; however, the exact evolution of their abundance and the nature of their emission remain open questions. We combine samples of 229 and 349 LAE candidates at z = 5.7 and z = 6.6, respectively, fr…
Improving the astrometric solution of the Hyper Suprime-Cam with anisotropic Gaussian processes
Rubin, D.; Astier, P.; Roodman, A. +5 more
Context. We study astrometric residuals from a simultaneous fit of Hyper Suprime-Cam images.
Aims: We aim to characterize these residuals and study the extent to which they are dominated by atmospheric contributions for bright sources.
Methods: We used Gaussian process interpolation with a correlation function (kernel) measured from the …
Gemini/Phoenix H-band analysis of the globular cluster AL 3
Minniti, D.; Zoccali, M.; Bica, E. +9 more
Context. The globular cluster AL 3 is old and located in the inner bulge. Three individual stars were observed with the Phoenix spectrograph at the Gemini South telescope. The wavelength region contains prominent lines of CN, OH, and CO, allowing the derivation of C, N, and O abundances of cool stars.
Aims: We aim to derive C, N, O abundances…
VEXAS: VISTA EXtension to Auxiliary Surveys. Data Release 2: Machine-learning based classification of sources in the Southern Hemisphere
Agnello, A.; Spiniello, C.; Khramtsov, V. +1 more
Context. We present the second public data release of the VISTA EXtension to Auxiliary Surveys (VEXAS), where we classify objects into stars, galaxies, and quasars based on an ensemble of machine learning algorithms.
Aims: The aim of VEXAS is to build the widest multi-wavelength catalogue, providing reference magnitudes, colours, and morpholo…