Search Publications
Where Do Quasar Hosts Lie with Respect to the Size-Mass Relation of Galaxies?
Kartaltepe, Jeyhan S.; Treu, Tommaso; Schramm, Malte +8 more
The evolution of the galaxy size-mass relation has been a puzzle for over a decade. High-redshift galaxies are significantly more compact than galaxies observed today at an equivalent mass, but how much of this apparent growth is driven by progenitor bias, minor mergers, secular processes, or feedback from active galactic nuclei (AGNs) is unclear.…
Infrared K-band Photometry of Field RR Lyrae Variable Stars
Layden, Andrew C.; Chaboyer, Brian; Tiede, Glenn P. +2 more
We present multi-epoch infrared photometry in the K s -band for 74 bright RR Lyrae variable stars tied directly to the Two-Micron All-Sky Survey (2MASS) photometric system. We systematize additional K-band photometry from the literature to the 2MASS system and combine it to obtain photometry for 146 RR Lyrae stars on a consistent, mode…
Nitrogen abundance in the X-ray halos of clusters and groups of galaxies
Gu, Liyi; Mao, Junjie; Kaastra, Jelle S. +6 more
Context. Chemical abundances in the X-ray halos (also known as the intracluster medium, ICM) of clusters and groups of galaxies can be measured via prominent emission line features in their X-ray spectra. Elemental abundances are footprints of time-integrated yields of various stellar populations that have left their specific abundance patterns pr…
A compilation of known QSOs for the Gaia mission
Liao, Shi-Long; Qi, Zhao-Xiang; Guo, Su-Fen +1 more
Quasars are essential for astrometry in the sense that they are spatially stationary because of their large distance from the Sun. The European Space Agency (ESA) astrometric satellite Gaia is scanning the whole sky with unprecedented accuracy up to the level of a few µas. However, Gaia’s two-fields-of-view-observation strategy may introduce…
Interstellar dust in the solar system: model versus in situ spacecraft data
Altobelli, Nicolas; Krüger, Harald; Grün, Eberhard +3 more
Context. In the early 1990s, contemporary interstellar dust penetrating deep into the heliosphere was identified with the in situ dust detector on board the Ulysses spacecraft. Later on, interstellar dust was also identified in the data sets measured with dust instruments on board Galileo, Cassini, and Helios. Ulysses monitored the interstellar du…
Period-luminosity diagram of long period variables in the Magellanic Clouds. New aspects revealed from Gaia Data Release 2
Mowlavi, N.; Lecoeur-Taïbi, I.; Lebzelter, T. +4 more
Context. The period-luminosity diagram (PLD) has proven to be a powerful tool for studying populations of pulsating red giants. Gaia Data Release 2 (DR2) provides a large data set including many long-period variables (LPVs) on which this tool can be applied.
Aims: We investigate the location of LPVs from the Large and Small Magellanic Clouds …
HD 101584: circumstellar characteristics and evolutionary status
Lindqvist, M.; Olofsson, H.; Bergman, P. +8 more
Context. There is growing evidence that red giant evolution is often affected by an interplay with a nearby companion, in some cases taking the form of a common-envelope evolution.
Aims: We have performed a study of the characteristics of the circumstellar environment of the binary object HD 101584, that provides information on a likely evolu…
Transit least-squares survey. II. Discovery and validation of 17 new sub- to super-Earth-sized planets in multi-planet systems from K2
Heller, René; Hippke, Michael; Rodenbeck, Kai
The extended Kepler mission (K2) has revealed more than 500 transiting planets in roughly 500 000 stellar light curves. All of these were found either with the box least-squares algorithm or by visual inspection. Here we use our new transit least-squares (TLS) algorithm to search for additional planets around all K2 stars that are currently known …
Systematic investigation of chemical abundances derived using IR spectra obtained with GIANO
Ryde, N.; Ludwig, H. -G.; Bonifacio, P. +11 more
Context. Detailed chemical abundances of Galactic stars are needed in order to improve our knowledge of the formation and evolution of our galaxy, the Milky Way.
Aims: We took advantage of the GIANO archive spectra to select a sample of Galactic disc stars in order to derive their chemical inventory and to compare the abundances we derived fr…
12,660 Spotted Stars toward the OGLE Galactic Bulge Fields
Soszyński, I.; Udalski, A.; Szymański, M. K. +12 more
We present the discovery and statistical analysis of 12,660 spotted variable stars toward and inside the Galactic bulge from the Optical Gravitational Lensing Experiment (OGLE) data that are over two decades long. We devise a new method of dereddening of individual stars toward the Galactic bulge where strong and highly nonuniform extinction is pr…