Search Publications
Signatures of Hot Molecular Hydrogen Absorption from Protoplanetary Disks. I. Non-thermal Populations
Loyd, R. O. Parke; Kruczek, Nicholas; France, Kevin +2 more
The environment around protoplanetary disks (PPDs) regulates processes that drive the chemical and structural evolution of circumstellar material. We perform a detailed empirical survey of warm molecular hydrogen (H2) absorption observed against H I-Lyα (Lyα: λ1215.67) emission profiles for 22 PPDs, using archival Hubble Space Telescope…
Origin of the solar wind: A novel approach to link in situ and remote observations. A study for SPICE and SWA on the upcoming Solar Orbiter mission
Berger, Lars; Wimmer-Schweingruber, Robert; Peleikis, Thies +1 more
Context. During the last decades great progress has been achieved in understanding the properties and the origin of the solar wind. While the sources for the fast solar wind are well understood, the sources for the slow solar wind remain elusive.
Aims: The upcoming Solar Orbiter mission aims to improve our understanding of the sources of the …
On the frequency of star-forming galaxies in the vicinity of powerful AGNs: The case of SMM J04135+10277
Knudsen, K. K.; Drouart, G.; Lagos, C. D. P. +2 more
Context. In the last decade several massive molecular gas reservoirs were found <100 kpc distance from active galactic nuclei (AGNs), residing in gas-rich companion galaxies. The study of AGN-gas-rich companion systems opens the opportunity to determine whether the stellar mass of massive local galaxies was formed in their host after a merger e…
Laboratory study of methyl isocyanate ices under astrophysical conditions
Cernicharo, J.; Timón, V.; Maté, B. +5 more
Methyl isocyanate has been recently detected in comet 67P/Churyumov-Gerasimenko (67P/CG) and in the interstellar medium. New physicochemical studies on this species are now necessary as tools for subsequent studies in astrophysics. In this work, infrared spectra of solid CH3NCO have been obtained at temperatures of relevance for astrono…
High-redshift active galactic nuclei and the next decade of Chandra and XMM-Newton
Brandt, W. N.; Vito, F.
We briefly review how X-ray observations of high-redshift active galactic nuclei (AGNs) at z = 4-7 have played a critical role in understanding their basic demographics as well as their physical processes; for example, absorption by nuclear material and winds, accretion rates, and jet emission. We point out some key remaining areas of uncertainty,…
Magnetic field geometry and chemical abundance distribution of the He-strong star CPD -57°3509
Ilyin, I.; Przybilla, N.; Briquet, M. +9 more
The magnetic field of CPD -57°3509 was recently detected in the framework of the BOB (B fields in OB stars) collaboration. We acquired low-resolution spectropolarimetric observations of CPD -57°3509 with the FOcal Reducer low-dispersion Spectrograph 2 and high-resolution UV-Visual Echelle Spectrograph observations randomly distributed over a few m…
Future of X-ray reverberation from AGN
Fabian, A. C.; Uttley, P.; Cackett, E. M. +3 more
XMM-Newton is capable of making a transformational advance in our understanding of how luminous accreting black holes work, by dedicating about 10% of future observing time to long observations, of order megaseconds, to X-ray variable active galactic nuclei (AGN) research. This would enable reverberation studies, already a commonplace feature of A…
Star Formation Conditions in a Planck Galactic Cold Clump, G108.84-00.81
Kim, Kee-Tae; Lee, Jeong-Eun; Liu, Tie +6 more
We present the results from a series of ground-based radio observations toward a Planck Galactic Cold Clump (PGCC), PGCC G108.84-00.81, which is located in one curved filamentary cloud in the vicinity of an extended H II region Sh2-152 and SNR G109.1-1.0. PGCC G108.84-00.81 is mainly composed of two clumps, “G108-N” and “G108-S”. In the 850 µ…
An Early Diagnostics of the Geoeffectiveness of Solar Eruptions from Photospheric Magnetic Flux Observations: The Transition from SOHO to SDO
Grechnev, V. V.; Chertok, I. M.; Abunin, A. A.
In our previous articles (Chertok et al. in Solar Phys. 282, 175, 2013; Chertok et al. in Solar Phys. 290, 627, 2015), we presented a preliminary tool for the early diagnostics of the geoeffectiveness of solar eruptions based on the estimate of the total unsigned line-of-sight photospheric magnetic flux in accompanying extreme ultraviolet (EUV) ar…
Optimizing future experiments of cosmic far-infrared background: a principal component approach
Wu, Hao-Yi; Doré, Olivier
The anisotropies of cosmic far-infrared background (CFIRB) probe the star formation rate (SFR) of dusty star-forming galaxies as a function of dark matter halo mass and redshift. We explore how future CFIRB experiments can optimally improve the SFR constraints beyond the current measurements of Planck. We introduce a model-independent, piecewise p…