Search Publications
Milky Way-like Gas Excitation in an Ultrabright Submillimeter Galaxy at z = 1.6
Rebolo, R.; Dannerbauer, H.; Ziegler, B. +3 more
Based on observations with the IRAM 30 m and Yebes 40 m telescopes, we report evidence of the detection of Milky Way-like, low-excitation molecular gas, up to the transition CO(J = 5-4), in a distant, dusty star-forming galaxy at z CO = 1.60454. WISE J122651.0+214958.8 (alias SDSS J1226, the Cosmic Seahorse), is strongly lensed by a for…
Vlasov simulation of electrons in the context of hybrid global models: an eVlasiator approach
Alho, Markku; Johlander, Andreas; Pfau-Kempf, Yann +8 more
Modern investigations of dynamical space plasma systems such as magnetically complicated topologies within the Earth's magnetosphere make great use of supercomputer models as well as spacecraft observations. Space plasma simulations can be used to investigate energy transfer, acceleration, and plasma flows on both global and local scales. Simulati…
Orbital Solutions of the New Low-mass Eclipsing Binary TIC 157376469 with Spotted Activities
Zhang, Xiaobin; Zong, Weikai; Fu, Jian-Ning +4 more
We carried out a photometric and spectroscopic analysis for the eclipsing binary TIC 157376469 using the TESS and LAMOST data. A new linear ephemeris is given. By fitting the light curves and radial velocity curves with the Wilson-Devinney code, it apperas that the binary is composed of two K-type main-sequence stars. The orbit of the binary is sl…
Particle-in-cell simulations of the Cassini spacecraft's interaction with Saturn's ionosphere during the Grand Finale
Shebanits, Oleg; Zhang, Zeqi; Desai, Ravindra T. +2 more
A surprising and unexpected phenomenon observed during Cassini's Grand Finale was the spacecraft charging to positive potentials in Saturn's ionosphere. Here, the ionospheric plasma was depleted of free electrons with negatively charged ions and dust accumulating up to over 95 per cent of the negative charge density. To further understand the spac…
Automatic identification of outliers in Hubble Space Telescope galaxy images
Shamir, Lior
Rare extragalactic objects can carry substantial information about the past, present, and future universe. Given the size of astronomical data bases in the information era, it can be assumed that very many outlier galaxies are included in existing and future astronomical data bases. However, manual search for these objects is impractical due to th…
Variable stars in the 50BiN open cluster survey. II. NGC 869
Li, Cheng-Yuan; Deng, Li-Cai; Wang, Kun +5 more
This work presents a time-series photometric variability survey of the young open cluster NGC 869. More than 13 000 CCD frames in the BV filters were collected on 19 nights between 2014 November 6 and 2014 December 24. In a 20' × 20' field centered on the cluster, we detected a total of 28 stars showing photometric variability, 12 of which are new…
A study of the accretion mechanisms of the high-mass X-ray binary IGR J00370+6122
Fukazawa, Yasushi; Makishima, Kazuo; Takahashi, Hiromitsu +1 more
IGR J00370+6122 is a high-mass X-ray binary with a B1 Ib primary star and a companion suggested to be a neutron star because of the detection of a 346 s pulsation in a one-off 4 ks observation. To better understand the nature of the compact companion, the present work performs timing and spectral studies of the X-ray data of this object, taken wit…
Combined Analysis of X-Ray Spectra of NGC 3227
Newman, J.; Liebmann, A. C.; Haba, Y. +2 more
The 1.5 Seyfert galaxy NGC 3227 has been observed by several X-ray missions. We carried out a combined analysis of the data obtained by more recent major observations of this source—two observations performed by XMM-Newton in 2000 and 2006 and six observations performed by Suzaku in 2008. A unified model, which is consistent with all eight of the …
Low-radio frequency observations of seven nearby galaxies with GMRT
Roy, Subhashis; Manna, Souvik
We have observed seven nearby large-angular-sized galaxies at 0.33 GHz using Giant Metrewave Radio Telescope with an angular resolution of ~10 arcsec and sub-mJy sensitivity. Using archival higher frequency data at 1.4 or ~6 GHz, we have then determined their spatially resolved non-thermal spectrum. As a general trend, we find that the spectral in…
Volatile Composition and Outgassing in C/2018 Y1 (Iwamoto): Extending Limits for High-resolution Infrared Cometary Spectroscopy between 2.8 and 5.0 µm
Vervack, Ronald J., Jr.; Kawakita, Hideyo; DiSanti, Michael A. +7 more
We used the powerful high spectral resolution cross-dispersed facility spectrograph, iSHELL, at the NASA Infrared Telescope Facility (IRTF) to observe C/2018 Y1 (Iwamoto), a long-period comet from the Oort cloud. We report production rates for water and eight other parent molecules (native ices), C2H6, CO, CH4, H