Search Publications
Survey of Gravitationally Lensed Objects in HSC Imaging (SuGOHI) - VII. Discovery and confirmation of three strongly lensed quasars
Schramm, Malte; Sonnenfeld, Alessandro; Oguri, Masamune +13 more
We present spectroscopic confirmation of three new two-image gravitationally lensed quasars, compiled from existing strong lens and X-ray catalogues. Images of HSC J091843.27-022007.5 show a red galaxy with two blue point sources at either side, separated by 2.26 arcsec. This system has a source and a lens redshifts zs = 0.804 and z
The MOSDEF survey: the mass-metallicity relationship and the existence of the FMR at z 1.5
Barro, Guillermo; Siana, Brian; Shapley, Alice E. +16 more
We analyse the rest-optical emission-line ratios of z ~ 1.5 galaxies drawn from the Multi-Object Spectrometer for Infra-Red Exploration Deep Evolution Field (MOSDEF) survey. Using composite spectra, we investigate the mass-metallicity relation (MZR) at z ~ 1.5 and measure its evolution to z = 0. When using gas-phase metallicities based on the N2 l…
On the discovery of stars, quasars, and galaxies in the Southern Hemisphere with S-PLUS DR2
Werle, A.; Mendes de Oliveira, C.; Akras, S. +25 more
This paper provides a catalogue of stars, quasars, and galaxies for the Southern Photometric Local Universe Survey Data Release 2 (S-PLUS DR2) in the Stripe 82 region. We show that a 12-band filter system (5 Sloan-like and 7 narrow bands) allows better performance for object classification than the usual analysis based solely on broad bands (regar…
Relations between the asteroseismic indices and stellar parameters of δ Scuti stars for two years of TESS mission
Hasanzadeh, A.; Safari, H.; Ghasemi, H.
We investigate the relationship between the asteroseismic indices and the physical quantities of 438 δ Scuti (DSCT) stars observed by the Transiting Exoplanet Survey Satellite (TESS) mission at 26 sectors. We study the scaling relations of stellar parameters (effective temperature, surface gravity, density, etc.) and asteroseismic indices such as …
Solar origins of a strong stealth CME detected by Solar Orbiter
Long, David M.; Möstl, Christian; Davies, Emma E. +6 more
Aims: We aim to locate the origin of a stealth coronal mass ejection (CME) detected in situ by the MAG instrument on board Solar Orbiter and make connections between the CME observed at the Sun and the interplanetary CME (ICME) measured in situ.
Methods: Remote sensing data were analysed using advanced image processing techniques to iden…
A stringent upper limit of 20 pptv for methane on Mars and constraints on its dispersion outside Gale crater
Daerden, F.; Forget, F.; Montmessin, F. +17 more
Context. Reports on the detection of methane in the Martian atmosphere have motivated numerous studies aiming to confirm or explain its presence on a planet where it might imply a biogenic or more likely a geophysical origin.
Aims: Our intent is to complement and improve on the previously reported detection attempts by the Atmospheric Chemist…
APOGEE spectroscopic evidence for chemical anomalies in dwarf galaxies: The case of M 54 and Sagittarius
Bizyaev, Dmitry; Beers, Timothy C.; Minniti, Dante +7 more
We present evidence for globular cluster stellar debris in a dwarf galaxy system (Sagittarius; Sgr) based on an analysis of high-resolution H-band spectra from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey. We add [N/Fe], [Ti/Fe], and [Ni/Fe] abundance ratios to the existing sample of potential members of M 54; this is…
HST/WFC3 Grism Observations of z 1 Clusters: Evidence for Rapid Outside-in Environmental Quenching from Spatially Resolved Hα Maps
Matharu, Jasleen; Muzzin, Adam; van der Wel, Arjen +12 more
We present and publicly release (www.gclasshst.com) the first spatially resolved Hα maps of star-forming cluster galaxies at z ~ 1, made possible with the Wide Field Camera 3 (WFC3) G141 grism on the Hubble Space Telescope (HST). Using a similar but updated method to 3D-HST in the field environment, we stack the Hα maps in bins of stellar mass, me…
Quantified diffuse light in compact groups of galaxies
Mosenkov, Aleksandr V.; Rich, R. Michael; Brosch, Noah +2 more
The vast majority of stars in galaxy groups are contained within their constituent galaxies. Some small fraction of stars is expected, however, to follow the global dark matter (DM) potential of the group. In compact groups, interactions between the galaxies should be frequent. This leads to a more intensive material stripping from the group membe…
The SALT survey of helium-rich hot subdwarfs: methods, classification, and coarse analysis
Jeffery, C. S.; Miszalski, B.; Snowdon, E.
A medium- and high-resolution spectroscopic survey of helium-rich hot subdwarfs is being carried out using the Southern African Large Telescope (SALT). Objectives include the discovery of exotic hot subdwarfs and of sequences connecting chemically peculiar subdwarfs of different types. The first phase consists of medium-resolution spectroscopy of …