Search Publications
Vibrationally Excited Lines of HC3N Associated with the Molecular Disk around the G24.78+0.08 A1 Hypercompact H II Region
Nakamura, Fumitaka; Takakuwa, Shigehisa; Taniguchi, Kotomi +7 more
We have analyzed Atacama Large Millimeter/submillimeter Array Band 6 data of the hypercompact H II region G24.78+0.08 A1 (G24 HC H II) and report the detection of vibrationally excited lines of HC3N (v 7 = 2, J = 24 - 23). The spatial distribution and kinematics of a vibrationally excited line of HC3N (v 7
Recent formation and likely cometary activity of near-Earth asteroid pair 2019 PR2-2019 QR6
Gustafsson, Annika; Christensen, Eric; Micheli, Marco +13 more
Asteroid pairs are genetically related asteroids that recently separated (<few million years), but still reside on similar heliocentric orbits. A few hundred of these systems have been identified, primarily in the asteroid main belt. Here, we studied a newly discovered pair of near-Earth objects (NEOs): 2019 PR2 and 2019 QR6. Based on broad-ban…
Multiresolution angular momentum measurements of z 1.5-2 star-forming galaxies
Glazebrook, Karl; Fisher, Deanne B.; Obreschkow, Danail +5 more
We present detailed stellar specific angular momentum (j*) measurements of 10 star-forming galaxies at z ~ 1.5-2, using both high and low spatial resolution integral field spectroscopic data. We developed a code that simultaneously models the adaptive optics (AO) assisted observations from OSIRIS/SINFONI along with their natural seeing …
Dense Gas and Star Formation in Nearby Infrared-bright Galaxies: APEX Survey of HCN and HCO+ J = 2 → 1
Wang, Junzhi; Gao, Yu; Zhang, Zhi-Yu +6 more
Both Galactic and extragalactic studies of star formation suggest that stars form directly from dense molecular gas. To trace such high volume density gas, HCN and HCO+ J = 1 → 0 have been widely used for their high dipole moments, relatively high abundances, and often being the strongest lines after CO. However, HCN and HCO+…
Surveying the Giant H II Regions of the Milky Way with SOFIA. IV. Sgr D, W42, and a Reassessment of the Giant H II Region Census
Lim, Wanggi; Karnath, Nicole; De Buizer, James M. +2 more
This is the fourth paper exploring the infrared properties of giant H II regions with the FORCAST instrument on the Stratospheric Observatory For Infrared Astronomy (SOFIA). Our survey utilizes the census of 56 Milky Way giant H II regions identified by Conti & Crowther, and in this paper we present the 20 and 37 µm imaging data we obtai…
Cen X-3 as Seen by MAXI During Six Years
Torrejón, J. M.; Sanjurjo-Ferrín, G.; Rodes-Roca, J. J. +2 more
The aim of this work is to study both light curve and orbital phase spectroscopy of Cen X-3taking advantage of the MAXI/GSCobservation strategy. These studies allow delimiting the stellar wind properties and its interactions with the compact object. From the analysis of the light curve, we have estimated the orbital period of the binary system and…
Eta Carinae: An Evolving View of the Central Binary, Its Interacting Winds and Its Foreground Ejecta
Hamaguchi, Kenji; Corcoran, Michael F.; Russell, Christopher M. P. +13 more
FUV spectra of η Car, recorded across two decades with HST/STIS, document multiple changes in resonant lines caused by dissipating extinction in our line of sight. The FUV flux has increased nearly tenfold, which has led to increased ionization of the multiple shells within the Homunculus and photodestruction of H2. Comparison of observ…
Time-of-Arrival of Coronal Mass Ejections: A Two-Phase Kinematics Approach Based on Heliospheric Imaging Observations
Vourlidas, Angelos; Paouris, Evangelos
The forecasting of the Time-of-Arrival (ToA) of coronal mass ejections (CMEs) to Earth does not yet meet most Space Weather users' requirements. The main physical reason is our incomplete understanding of CME propagation in the inner heliosphere. Therefore, many ToA forecasting algorithms rely on simple empirical relations to represent the interpl…
No detection of SO2, H2S, or OCS in the atmosphere of Mars from the first two Martian years of observations from TGO/ACS
Forget, F.; Montmessin, F.; Fedorova, A. A. +13 more
Context. The detection of sulphur species in the Martian atmosphere would be a strong indicator of volcanic outgassing from the surface of Mars.
Aims: We wish to establish the presence of SO2, H2S, or OCS in the Martian atmosphere or determine upper limits on their concentration in the absence of a detection.
Method…
Effect of the Heliospheric State on CME Evolution
Gopalswamy, Nat; Akiyama, Sachiko; Yashiro, Seiji +2 more
The culmination of solar cycle 24 by the end of 2019 has created the opportunity to compare the differing properties of coronal mass ejections (CMEs) between two whole solar cycles: solar cycle 23 (SC 23) and solar cycle 24 (SC 24). We report on the width evolution of limb CMEs in SCs 23 and 24 in order to test the suggestion by Gopalswamy et al. …