Search Publications
Herschel observations of extraordinary sources: full Herschel/HIFI molecular line survey of Sagittarius B2(M)
Comito, C.; Schilke, P.; Lis, D. C. +5 more
Context. We present a full analysis of a broadband spectral line survey of Sagittarius B2 (Main), one of the most chemically rich regions in the Galaxy located within the giant molecular cloud complex Sgr B2 in the central molecular zone.
Aims: Our goal is to derive the molecular abundances and temperatures of the high-mass star-forming regio…
A [C II] 158 µm emitter associated with an O I absorber at the end of the reionization epoch
Hennawi, Joseph F.; Fan, Xiaohui; Prochaska, J. Xavier +11 more
The physical and chemical properties of the circumgalactic medium at z ≳ 6 have been studied successfully through the absorption in the spectra of background quasi-stellar objects1-3. One of the most crucial questions is to investigate the nature and location of the source galaxies that give rise to these early metal absorbers4-6
Simultaneous ALMA-Hinode-IRIS Observations on Footpoint Signatures of a Soft X-Ray Loop-like Microflare
Shimojo, Masumi; Shimizu, Toshifumi; Abe, Masashi
Microflares have been considered to be among the major energy input sources to form active solar corona. To investigate the response of the low atmosphere to events, we conducted an Atacama Large Millimeter/submillimeter Array (ALMA) observation at 3 mm, coordinated with Interface Region Imaging Spectrograph (IRIS) and Hinode observations, on 2017…
Sagittarius B1: A Patchwork of H II Regions and Photodissociation Regions
Kaufman, Michael J.; Colgan, Sean W. J.; Simpson, Janet P. +2 more
Sgr B1 is a luminous H II region in the Galactic center immediately next to the massive star-forming giant molecular cloud Sgr B2 and apparently connected to it from their similar radial velocities. In 2018 we showed from SOFIA FIFI-LS observations of the [O III] 52 and 88 µm lines that there is no central exciting star cluster and that the …
Numerical MHD Simulations of the 3D Morphology and Kinematics of the 2017 September 10 CME-driven Shock from the Sun to Earth
Shen, Fang; Feng, Xueshang; Zhang, Man +8 more
A global, three-dimensional (3D) numerical simulation model has been employed to study the 3D morphology and kinematics of the large shock driven by the 2017 September 10 coronal mass ejection (CME). Based on actual solar observations, which include the photospheric magnetic field and the CME's speed and source location, the simulation result is d…
X-Ray AGB Stars in the 4XMM-DR9 Catalog: Further Evidence for Companions
Guerrero, M. A.; Ortiz, R.
Single AGB stars are not normally expected to be X-ray emitters due to the lack of a corona capable of powering a hot plasma. Therefore, the detection of X-ray emission in AGB stars by the ROSAT, Chandra, and XMM-Newton observatories has been interpreted as evidence for binarity. The number of X-ray-emitting AGB stars is, however, very small, and …
A study of the Czernik 2 and NGC 7654 open clusters using CCD UBV photometric and Gaia EDR3 data
Paunzen, E.; Bilir, S.; Ak, T. +5 more
We analysed the open clusters Czernik 2 and NGC 7654 using CCD UBV photometric and Gaia Early Data Release 3 (EDR3) photometric and astrometric data. Structural parameters of the two clusters were derived, including the physical sizes of Czernik 2 being
Deciphering the Deep Origin of Active Regions via Analysis of Magnetograms
McIntosh, Scott W.; Chatterjee, Subhamoy; Dikpati, Mausumi +5 more
In this work, we derive magnetic toroids from surface magnetograms by employing a novel optimization method, based on the trust region reflective algorithm. The toroids obtained in this way are combinations of Fourier modes (amplitudes and phases) with low longitudinal wavenumbers. The optimization also estimates the latitudinal width of the toroi…
Investigating the delay between dust radiation and star-formation in local and distant quenching galaxies
Elbaz, D.; Ciesla, L.; Buat, V. +3 more
We investigate the timescale over which the infrared (IR) luminosity decreases after a complete and rapid quenching of star formation using observations of local and high-redshift galaxies. From spectral energy distribution modelling, we derive the time since quenching of a subsample of 14 galaxies from the Herschel Reference Survey that suffer fr…
Probing the Atmospheric Cl Isotopic Ratio on Mars: Implications for Planetary Evolution and Atmospheric Chemistry
Vandaele, Ann Carine; Aoki, Shohei; Liuzzi, Giuliano +22 more
Following the recent detection of HCl in the atmosphere of Mars by ExoMars/Trace Gas Orbiter, we present here the first measurement of the 37Cl/35Cl isotopic ratio in the Martian atmosphere using a set of Nadir Occultation for MArs Discovery (NOMAD) observations. We determine an isotopic anomaly of −6 ± 78‰ compared to Earth …