Search Publications
Multiscale, multiwavelength extraction of sources and filaments using separation of the structural components: getsf
Men'shchikov, A.
High-quality astronomical images delivered by modern ground-based and space observatories demand adequate, reliable software for their analysis and accurate extraction of sources, filaments, and other structures, containing massive amounts of detailed information about the complex physical processes in space. The multiwavelength observations with …
r-Process elements from magnetorotational hypernovae
Schmidt, B. P.; Da Costa, G. S.; Marino, A. F. +11 more
Neutron-star mergers were recently confirmed as sites of rapid-neutron-capture (r-process) nucleosynthesis1-3. However, in Galactic chemical evolution models, neutron-star mergers alone cannot reproduce the observed element abundance patterns of extremely metal-poor stars, which indicates the existence of other sites of r-process nucleo…
CGM2 I: The Extent of the Circumgalactic Medium Traced by Neutral Hydrogen
Tripp, Todd M.; Prochaska, J. Xavier; Tejos, Nicolas +8 more
We present initial results from the Cosmic Origins Spectrograph (COS) and Gemini Mapping the Circumgalactic Medium (CGMCGM ≡ CGM2) survey. The CGM2 survey consists of 1689 galaxies, all with high-quality Gemini-GMOS spectra, within 1 Mpc of 22 z ≲ 1 quasars, all with a signal-to-noise ratio of ∼10 Hubble Space Telescope/COS G…
A New View of the Solar Interface Region from the Interface Region Imaging Spectrograph (IRIS)
Reeves, Katharine K.; Polito, Vanessa; Liu, Wei +11 more
The Interface Region Imaging Spectrograph (IRIS) has been obtaining near- and far-ultraviolet images and spectra of the solar atmosphere since July 2013. IRIS is the highest resolution observatory to provide seamless coverage of spectra and images from the photosphere into the low corona. The unique combination of near- and far-ultraviolet spectra…
A hard X-ray view of luminous and ultra-luminous infrared galaxies in GOALS - I. AGN obscuration along the merger sequence
Sanders, D. B.; Stern, D.; Inami, H. +25 more
The merger of two or more galaxies can enhance the inflow of material from galactic scales into the close environments of active galactic nuclei (AGNs), obscuring and feeding the supermassive black hole (SMBH). Both recent simulations and observations of AGN in mergers have confirmed that mergers are related to strong nuclear obscuration. However,…
Exploring the origin of low-metallicity stars in Milky-Way-like galaxies with the NIHAO-UHD simulations
Buck, Tobias; Sestito, Federico; Navarro, Julio F. +6 more
The kinematics of the most metal-poor stars provide a window into the early formation and accretion history of the Milky Way (MW). Here, we use five high-resolution cosmological zoom-in simulations (∼ 5 × 106 star particles) of MW-like galaxies taken from the NIHAO-UHD project, to investigate the origin of low-metallicity stars ([Fe/H] …
The CALYPSO IRAM-PdBI survey of jets from Class 0 protostars. Exploring whether jets are ubiquitous in young stars
Maret, S.; Podio, L.; Codella, C. +10 more
Aims: As a part of the CALYPSO Large Program, we aim to constrain the properties of protostellar jets and outflows by searching for corresponding emission in a sample of 21 Class 0 protostars covering a broad range of internal luminosities (Lint from 0.035 L⊙ to 47 L⊙).
Methods: We analyzed high angular (…
The ASAS-SN catalogue of variable stars IX: The spectroscopic properties of Galactic variable stars
Kochanek, C. S.; Stanek, K. Z.; Dong, Subo +11 more
The All-Sky Automated Survey for Supernovae provides long baseline (~4 yr) V-band light curves for sources brighter than V≲ 17 mag across the whole sky. We produced V-band light curves for a total of ~61.5 million sources and systematically searched these sources for variability. We identified ~426 000 variables, including ~219 000 new discoveries…
Flares in open clusters with K2. II. Pleiades, Hyades, Praesepe, Ruprecht 147, and M 67
Kristiansen, Martti H.; Omohundro, Mark; Davenport, James R. A. +3 more
Context. Magnetic fields are a key component in the main sequence evolution of low mass stars. Flares, energetic eruptions on the surfaces of stars, are an unmistakable manifestation of magnetically driven emission. The occurrence rates and energy distributions of flares trace stellar characteristics such as mass and age. However, before flares ca…
ARES. V. No Evidence For Molecular Absorption in the HST WFC3 Spectrum of GJ 1132 b
Drossart, Pierre; Bouwman, Jeroen; Blain, Doriann +25 more
We present a study on the spatially scanned spectroscopic observations of the transit of GJ 1132 b, a warm (∼500 K) super-Earth (1.13 R⊕) that was obtained with the G141 grism (1.125-1.650 µm) of the Wide Field Camera 3 (WFC3) on board the Hubble Space Telescope. We used the publicly available Iraclis pipeline to extract the plane…