Search Publications
Small-scale chemical abundance analysis in a blue compact dwarf galaxy SBS 1415+437
Kumari, Nimisha; Aloisi, Alessandra; James, Bethan L. +1 more
We use integral field spectroscopic (IFS) observations from Gemini Multi-Object Spectrograph-North (GMOS-N) to analyse the ionized gas in the principal star-forming region in the blue compact dwarf galaxy SBS 1415+437. The IFS data enable us to map the weak auroral line [O III] λ4363 at a spatial scale of ∼6.5 pc across a region of ∼143 × 143 pc
Microlens mass determination for Gaia's predicted photometric events
Evans, N. W.; Belokurov, V.; Zhang, Z. H. +2 more
We used Gaia Data Release 2 to search for upcoming photometric microlensing events, identifying two candidates with high amplification. In the case of candidate 1, a spectrum of the lens (l1) confirms it is a usdM3 subdwarf with mass ≈0.11M⊙, while the event reaches maximum amplification of 20^{+20}_{-10} mmag on 2019 November 3 (±1d). …
The extended main-sequence turn-off of the Milky Way open cluster Collinder 347
Piatti, Andrés E.; Bonatto, Charles
We made use of the Gaia DR2 archive to comprehensively study the Milky Way open cluster Collinder 347, known until now as a very young object of solar metal content. However, the G versus GBP - GRP colour-magnitude diagram (CMD) of bonafide probable cluster members, selected on the basis of individual stellar proper motions, …
Star-formation rates of two GRB host galaxies at z ∼ 2 and a [C II] deficit observed with ALMA
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +6 more
The event rate of long gamma-ray bursts (GRBs) is expected to be a useful tracer of cosmic star-formation history. For this purpose, it is necessary to understand what kinds of star formation/galaxies are traced by GRBs. Here we report rest-frame far-infrared (FIR) continuum detections of the GRB 070521 and 080207 host galaxies at z ∼ 2 with Ataca…
XMMU J181227.8-181234: a new ultracompact X-ray binary candidate
in't Zand, J. J. M.; Kuulkers, E.; Keek, L. +3 more
We report the discovery of Type I (thermonuclear) X-ray bursts from the transient source XMMU J181227.8-181234 = XTE J1812-182. We found seven X-ray bursts in Rossi X-ray Timing Explorer observations during the 2008 outburst, confirming the source as a neutron star low-mass X-ray binary. Based on the measured burst fluence and the average recurren…
Not gone with the wind: Planet occurrence is independent of stellar galactocentric velocity
Kipping, David M.; McTier, Moiya A. S.
We demonstrate that planet occurrence does not depend on stellar galactocentric velocity in the Solar neighbourhood. Using Gaia DR2 astrometry and radial velocity data, we calculate 3D galactocentric velocities for 197 090 Kepler field stars, 1647 of which are confirmed planet hosts. When we compare the galactocentric velocities of planet hosts to…
Optical properties of amorphous carbon dust around C-stars: new constraints from 2MASS and Gaia observations
Nanni, Ambra
In this work the optical properties of amorphous carbon (amC) dust condensed around carbon(C)-stars are constrained by comparing the observations for the Large Magellanic Cloud C-stars from the Two Micron All Sky Survey (2MASS) and from the Gaia data release 2 (DR2) with the synthetic photometry obtained by computing dust growth and radiative tran…
A high-resolution, dust-selected molecular cloud catalogue of M33, the Triangulum Galaxy
Smith, Matthew W. L.; Williams, Thomas G.; Gear, Walter K.
We present a catalogue of Giant Molecular Clouds (GMCs) in M33, extracted from cold dust continuum emission. Our GMCs are identified by computing dendrograms. We measure the spatial distribution of these clouds, and characterize their dust properties. Combining these measured properties with CO(J = 2-1) and 21 cm H I data, we calculate the gas-to-…
SPLOT: a snapshot survey for polarized light in optical transients
Covino, S.; Hodgkin, S. T.; Wyrzykowski, Ł. +7 more
We present SPLOT, a small-scale pilot survey to test the potential of snapshot (single epoch) linear imaging polarimetry as a supplementary tool to traditional transient follow-up. Transients exist in a vast volume of observational parameter space and polarimetry has the potential to highlight sources of scientific interest and add value to near r…
Orbits of 14 binaries based on 2018 SOAR speckle observations
Docobo, José A.; Campo, Pedro P.; Horch, Elliott P. +4 more
New data obtained during the 2018 March-April speckle run at the 4.1 m Southern Astrophysical Research (SOAR) telescope located at Cerro Pachón (Chile) allowed us to recalculate the orbits of the following visual binaries: WDS 06478+0020 (STT 157), WDS 07003-2207 (FIN 334Aa,Ab), WDS 07013-0906 (A 671), WDS 10174-5354 (CVN 16Aa,Ab), WDS 12155-3106 …