Search Publications
Gauging the effect of supermassive black holes feedback on quasar host galaxies
Kraemer, S. B.; Crenshaw, D. M.; Storchi-Bergmann, T. +6 more
In order to gauge the role that active galactic nuclei play in the evolution of galaxies via the effect of kinetic feedback in nearby QSO 2's (z ~ 0.3), we observed eight such objects with bolometric luminosities $L_{bol} \sim 10^{46}\rm {erg\, s^{-1}}$ using Gemini Multi-Object Spectrograph-integral field units. The emission lines were fitted wit…
Hubble Space Telescope observations of [O III] emission in nearby QSO2s: physical properties of the ionized outflows
Turner, T. J.; Kraemer, S. B.; Crenshaw, D. M. +14 more
We use Hubble Space Telescope/Space Telescope Imaging Spectrograph long-slit G430M and G750M spectra to analyse the extended [O III] λ5007 emission in a sample of 12 nearby (z < 0.12) luminous (Lbol > 1.6 × 1045 erg s-1) QSO2s. The purpose of the study is to determine the properties of the mass outflows of io…
Carbon stars as standard candles - II. The median J magnitude as a distance indicator
Rousseau-Nepton, Laurie; Heyl, Jeremy; Richer, Harvey +2 more
We introduce a new distance determination method using carbon-rich asymptotic giant branch stars (CS) as standard candles and the Large and Small Magellanic Clouds (LMC and SMC) as the fundamental calibrators. We select the samples of CS from the ((J - Ks)0, J0) colour-magnitude diagrams, as, in this combination of…
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 …
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 …
Exploring the role of binarity in the origin of the bimodal rotational velocity distribution in stellar clusters
Kamann, Sebastian; Saracino, Sara; Bastian, Nate +2 more
Many young- and intermediate-age massive stellar clusters host bimodal distributions in the rotation rates of their stellar populations, with a dominant peak of rapidly rotating stars and a secondary peak of slow rotators. The origin of this bimodal rotational distribution is currently debated and two main theories have been put forward in the lit…