Search Publications
Autonomous on-board data processing and instrument calibration software for the Polarimetric and Helioseismic Imager on-board the Solar Orbiter mission
Hirzberger, Johann; Solanki, Sami K.; Woch, Joachim +18 more
A frequent problem arising for deep space missions is the discrepancy between the amount of data desired to be transmitted to the ground and the available telemetry bandwidth. A part of these data consists of scientific observations, being complemented by calibration data to help remove instrumental effects. We present our solution for this discre…
The nuclear region of NGC 613 - I. Multiwavelength analysis
Steiner, J. E.; Menezes, R. B.; da Silva, Patrícia
In this paper, we report a detailed study with a variety of data from optical, near-infrared, X-ray, and radio telescopes of the nuclear region of the galaxy NGC 613 with the aim of understanding its complexity. We detected an extended stellar emission in the nucleus that, at first, appears to be, in the optical band, two stellar nuclei separated …
Kinematics of disk galaxies in (proto-)clusters at z = 1.5
Böhm, A.; Koyama, Y.; Kodama, T. +5 more
Aims: While many aspects of the impact of dense environments on late-type galaxies at redshifts below unity have been scrutinized in the past few decades, observational studies of the interplay between environment and disk galaxy evolution at z > 1 are still scarce. We observed star-forming galaxies at z ≈ 1.5 selected from the HyperSuprim…
Intrinsic Color Indices of Early-type Dwarf Stars
Jiang, Biwei; Yuan, Haibo; Deng, Dingshan +2 more
Early-type stars are short lived and scarce in comparison with other types. Based on the recently released catalogs of early-type stars from the largest Large Sky Area Multi-Object Fiber Spectroscopic Telescope spectroscopic survey, the intrinsic colors of the stars with effective temperature up to 32,000 K are determined for the bands from ultrav…
π Earth: A 3.14 day Earth-sized Planet from K2's Kitchen Served Warm by the SPECULOOS Team
Triaud, Amaury H. M. J.; Fulton, Benjamin J.; Howard, Andrew W. +25 more
We report on the discovery of a transiting Earth-sized (0.95R⊕) planet around an M3.5 dwarf star at 57 pc, EPIC 249631677. The planet has a period of ∼3.14 days, i.e., ∼π, with an installation of 7.45 S⊕. The detection was made using publicly available data from K2's Campaign 15. We observed three additional transits with SPE…
A Systematic Search for the Reddest Far-infrared and Submillimeter Galaxies: Revealing Dust-embedded Starbursts at High Redshifts
Yan, Haojing; Ma, Zhiyuan; Huang, Jia-Sheng +1 more
We present the results of our systematic search for the reddest far-infrared (FIR) and submillimeter (sub-mm) galaxies using the data from the Herschel Multi-tiered Extragalactic Survey (HerMES) and the SCUBA2 Cosmological Legacy Survey (S2CLS). The red FIR galaxies are "500 µm risers," whose spectral energy distributions increase with wavel…
Accretion and jets in a low-luminosity AGN: the nucleus of NGC 1052
Larsson, J.; Falocco, S.; Nandi, S.
Aims: We aim to determine the properties of the central region of NGC 1052 using X-ray and radio data. NGC 1052 (z = 0.005) has been investigated for decades in different energy bands and shows radio lobes and a low-luminosity active galactic nucleus.
Methods: We used X-ray images from Chandra and radio images from Very Large Array to ex…
Testing the Keplerian disk hypothesis using x-ray reflection spectroscopy
Tripathi, Ashutosh; Zhou, Biao; Abdikamalov, Askar B. +3 more
The Novikov-Thorne model is the standard framework for the description of geometrically thin and optically thick accretion disks around black holes and is widely used to study the electromagnetic spectra of accreting black holes. One of the assumptions of the model is that the particles of the gas move on nearly geodesic circular orbits on the equ…
Reflection Features in the X-Ray Spectrum of Fairall 9 and Implications for Tests of General Relativity
Abdikamalov, Askar B.; Ayzenberg, Dimitry; Bambi, Cosimo +2 more
X-ray reflection spectroscopy is potentially a powerful tool to probe the spacetime geometry around astrophysical black holes and test general relativity in the strong field regime. However, precision tests of general relativity are only possible if we employ the correct astrophysical model and if we can limit the systematic uncertainties. It is t…
Influence of landslides on the erosion of slopes on comet 9P/Tempel 1: Laboratory experiments and numerical simulations
Czechowski, Leszek; Kossacki, Konrad J.; Skóra, Grzegorz
Observations of Comet 9P/Tempel 1 indicate that the boundary of the thick, fluid-like deposit had retreated by up to 50 m during one orbital period (Veverka et al., 2013; Thomas et al., 2013). According to Kossaki (2015), sublimation of buried ice may be responsible for the observed effect, but only if the dust has very high thermal conductivity. …