Search Publications
Recurrent Cometary Activity in Near-Earth Object (3552) Don Quixote
Smith, Howard A.; Hora, Joseph L.; Agarwal, Jessica +12 more
We report on observations of activity in near-Earth object (3552) Don Quixote using the Spitzer Space Telescope and ground-based telescopes around its 2018 perihelion passage. Spitzer observations obtained six months before perihelion show extended emission around the target's nucleus that is most likely caused by molecular band emission from eith…
Dust and star formation in the centre of NGC 3311
Hilker, M.; Richtler, T.; Barbosa, C. E. +1 more
Context. NGC 3311 is the central galaxy of the Hydra I galaxy cluster. It has a hot interstellar medium and hosts a central dust lane with emission lines. These dust lanes are frequent in elliptical galaxies, but the case of NGC 3311 might be particularly interesting for problems of dust lifetime and the role of cool gas in the central parts.
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Adiabatic Invariants Calculations for Cluster Mission: A Long-Term Product for Radiation Belts Studies
Kronberg, Elena A.; Daly, Patrick W.; Shprits, Yuri Y. +3 more
Young Stars near Cometary Globule CG 30 in the Tumultuous Gum Nebula
White, Russel J.; Yep, Alexandra C.
We have conducted a high-dispersion (R ∼ 34,000) optical spectroscopic study of 10 young stars near the cometary globule CG 30 in the Gum Nebula, a diffuse H II region home to at least 32 cometary globules. All 10 spectroscopically observed stars at the nebula's northern edge are of low mass (spectral types M4.5-K5), have broad Hα emission, and sh…
X-raying winds in distant quasars: The first high-redshift wind duty cycle
Cappi, M.; Vignali, C.; Dadina, M. +6 more
Aims: Theoretical models of wind-driven feedback from active galactic nuclei (AGN) often identify ultra-fast outflows as being the main agent in the generation of galaxy-sized outflows, which are possibly the main actors in establishing so-called AGN-galaxy co-evolution. Ultra-fast outflows are well characterized in local AGN but much less is…
Discovery of a near-infrared bar and a pseudo-bulge in the collisional ring galaxy Cartwheel
Mayya, Y. D.; Barway, Sudhanshu; Robleto-Orús, Aitor
We report the discovery of a bar, a pseudo-bulge, and unresolved point source in the archetype collisional ring galaxy Cartwheel using careful morphological analysis of a near-infrared (NIR) Ks-band image of excellent quality (seeing = 0.42″) at the ESO archive. The bar is oval-shaped with a semi-major axis length of 3.23
SCUBA-2 overdensities associated with candidate protoclusters selected from Planck data
Andreani, P.; Valtchanov, I.; Clements, D. L. +21 more
We measure the 850-µm source densities of 46 candidate protoclusters selected from the Planck high-z catalogue (PHz) and the Planck Catalogue of Compact Sources (PCCS) that were followed up with Herschel-SPIRE and SCUBA-2. This paper aims to search for overdensities of 850-µm sources in order to select the fields that are most likely t…
Spectroscopic Observations of High-speed Downflows in a C1.7 Solar Flare
Ding, M. D.; Li, Y.; Hong, Jie +2 more
In this paper, we analyze the high-resolution UV spectra for a C1.7 solar flare (SOL2017-09-09T06:51) observed by the Interface Region Imaging Spectrograph (IRIS). We focus on the spectroscopic observations at the locations where the cool lines of Si IV 1402.8 Å (∼104.8 K) and C II 1334.5/1335.7 Å (∼104.4 K) reveal significan…
Search for the sub-stellar lithium depletion boundary in the open star cluster Coma Berenices
Béjar, V. J. S.; Martín, E. L.; Lodieu, N.
Aims: We mainly aim to search for the lithium depletion boundary (LDB) among the sub-stellar population of the open star cluster Coma Berenices.
Methods: Since the number of brown dwarf candidates in Coma Ber available in the literature is scarce, we carried out a search for additional candidates photometrically using colour-magnitude di…
Evolutionary Status of the Ap Stars HD 110066 and HD 153882
Romanovskaya, A. M.; Ryabchikova, T. A.; Shulyak, D. V.
We present the results of our determination of the fundamental atmospheric parameters for the magnetic chemically peculiar Ap stars HD 110066 (AX CVn) and HD 153882 (V451 Her). The determination of the atmospheric parameters ($T_{\textrm{eff}}$, $\textrm{log}{g}$, $R/R_{\odot}$, and $L/L_{\odot}$) is based on a self-consistent analysis of high-res…