Search Publications
Binary open clusters in the Gaia data
Hu, Qingshun; Esamdin, Ali; Song, Fangfang +1 more
Context. Observations indicate that the fraction of potential binary star clusters in the Milky Way is either the same or lower than that of the Magellanic Clouds. The unprecedented precision in the parallax measurements by Gaia has allowed for the discovery of a growing number of new binary open clusters (OCs).
Aims: We aim to survey the can…
COSMOS2020: Manifold learning to estimate physical parameters in large galaxy surveys
Sanders, D. B.; Ilbert, O.; Moneti, A. +16 more
We present a novel method for estimating galaxy physical properties from spectral energy distributions (SEDs) as an alternative to template fitting techniques and based on self-organizing maps (SOMs) to learn the high-dimensional manifold of a photometric galaxy catalog. The method has previously been tested with hydrodynamical simulations in Davi…
Spatially resolved star-formation relations of dense molecular gas in NGC 1068
Colina, L.; García-Burillo, S.; Fuente, A. +5 more
Context. According to the current understanding of star formation (SF), the regulation of this phenomenon in galaxy disks reflects a complex balance between processes that operate in molecular gas on local cloud scales as well as on global disk scales.
Aims: We analyse the influence of the dynamical environment on the SF relations of the dens…
ESPRESSO observations of HE 0107−5240 and other CEMP-no stars with [Fe/H] ≤ -4.5
Rebolo, R.; Zapatero Osorio, M. R.; Allende Prieto, C. +22 more
Context. HE 0107−5240 is a hyper metal-poor star with [Fe/H] = −5.39, one of the lowest-metallicity stars known. Its stellar atmosphere is enhanced in carbon, with [C/Fe] = +4.0, without a detectable presence of neutron-capture elements. Therefore, it belongs to the carbon-enhanced metal-poor (CEMP−no) group, along with the majority of the most me…
Dynamical Mass of the Exoplanet Host Star HR 8799
Bowler, Brendan P.; Sepulveda, Aldo G.
HR 8799 is a young A5/F0 star hosting four directly imaged giant planets at wide separations (~16-78 au), which are undergoing orbital motion and have been continuously monitored with adaptive optics imaging since their discovery over a decade ago. We present a dynamical mass of HR 8799 using 130 epochs of relative astrometry of its planets, which…
Large-amplitude periodic outbursts and long-period variables in the VVV VIRAC2-β data base
Minniti, D.; Bayo, A.; Catelan, M. +13 more
The VISTA Variables in the Via Lactea (VVV) survey obtained near-infrared photometry towards the Galactic bulge and the southern disc plane for a decade (2010-2019). We designed a modified Lomb-Scargle method to search for large-amplitude ($\Delta K_{s, 2-98{{\ \rm per\ cent}}}$ > 1.5 mag) mid to long-term periodic variables (P> 10 d) in the…
Extreme Variation in Star Formation Efficiency across a Compact, Starburst Disk Galaxy
Bolatto, A. D.; Fisher, D. B.; Glazebrook, K. +4 more
We report on the internal distribution of star formation efficiency in IRAS 08339+6517 (hereafter IRAS08), using ~200 pc resolution CO(2 - 1) observations from NOEMA. The molecular gas depletion time changes by 2 orders-of-magnitude from disk-like values in the outer parts to less than 108 yr inside the half-light radius. This translate…
Tidally induced spiral arm wraps encoded in phase space
Anders, F.; Antoja, T.; Bernet, M. +3 more
Context. The impact of Sagittarius and other satellite galaxies such as the Large Magellanic Cloud on our Galaxy and in particular its disc is gradually being disclosed. Simulations tailored to the interaction of the Milky Way (MW) and Sagittarius show rings and spiral arms appearing in the Galaxy disc. However, spiral arms can also be induced by …
The Stellar-age Dependence of X-Ray Emission from Normal Star-forming Galaxies in the GOODS Fields
Williams, Benjamin F.; Brandt, William N.; Luo, Bin +11 more
The Chandra Deep Field-South and North surveys (CDFs) provide unique windows into the cosmic history of X-ray emission from normal (nonactive) galaxies. Scaling relations of normal-galaxy X-ray luminosity (L X) with star formation rate (SFR) and stellar mass (M ⋆) have been used to show that the formation rates of low-mass an…
Embedded Young Massive Star Clusters in the Antennae Merger
Johnson, Kelsey; He, Hao; Wilson, Christine +3 more
The properties of young massive clusters (YMCs) are key to understanding the star formation mechanism in starburst systems, especially mergers. We present Atacama Large Millimeter/submillimeter Array high-resolution (~10 pc) continuum (100 and 345 GHz) data of YMCs in the overlap region of the Antennae galaxy. We identify six sources in the overla…