Search Publications
Near-infrared Spectroscopy of Infrared-excess Stellar Objects in the Young Supernova Remnant G54.1+0.3
Koo, Bon-Chul; Moon, Dae-Sik; Kim, Hyun-Jeong
We present the results of broadband near-infrared spectroscopic observations of the recently discovered mysterious stellar objects in the young supernova remnant G54.1+0.3. These objects, which show significant mid-infrared-excess emission, are embedded in a diffuse loop structure of ~1' in radius. Their near-infrared spectra reveal characteristic…
Simulations of the latitudinal variability of CO-like and OCS-like passive tracers below the clouds of Venus using the Laboratoire de Météorologie Dynamique GCM
Lebonnois, S.; Marcq, E.
The lower atmosphere of Venus below the clouds is a transitional region between the relatively calm lowermost scale height and the superrotating atmosphere in the cloud region and above. Any observational constraint is then welcome to help in the development of general circulation models of Venus, a difficult task considering the thickness of its …
Solar system: Saturn's ring rain
Connerney, Jack
Saturn's atmosphere bears a latent image of its icy rings, implying that electrically charged bits of water ice are being transported along magnetic-field lines of force from sources in the ring plane to the upper atmosphere. See Letter p.193
Study of a sample of faint Be stars in the exofield of CoRoT. I. Spectroscopic characterization
Frémat, Y.; Zorec, J.; Hubert, A. M. +4 more
Context. Be stars are probably the most rapid rotators among stars in the main sequence (MS) and, as such, are excellent candidates to study the incidence of the rotation on the characteristics of their non-radial pulsations, as well as on their internal structure. Pulsations are also thought to be possible mechanisms that help the mass ejection n…
A simple prescription for simulating and characterizing gravitational arcs
da Costa, L. N.; Maia, M. A. G.; Santiago, B. X. +6 more
Simple models of gravitational arcs are crucial for simulating large samples of these objects with full control of the input parameters. These models also provide approximate and automated estimates of the shape and structure of the arcs, which are necessary for detecting and characterizing these objects on massive wide-area imaging surveys. We he…
CEN 34 - high-mass YSO in M 17 or background post-AGB star?
Fang, Min; Chen, Zhiwei; Jiang, Zhibo +3 more
We investigate the proposed high-mass young stellar object (YSO) candidate CEN 34, thought to be associated with the star-forming region M 17. Its optical to near-infrared (550-2500 nm) spectrum reveals several photospheric absorption features, such as Hα, the Ca ii triplet, and the CO bandhead, but lacks emission lines. The spectral features in t…
Dust Properties of Local Dust-obscured Galaxies with the Submillimeter Array
Hwang, Ho Seong; Andrews, Sean M.; Geller, Margaret J.
We report Submillimeter Array observations of the 880 µm dust continuum emission for four dust-obscured galaxies (DOGs) in the local universe. Two DOGs are clearly detected with S ν(880 µm) =10-13 mJy and S/N > 5, but the other two are not detected with 3σ upper limits of S ν(880 µm) =5-9 mJy. Including a…
Temperature Response of the 171 Å Passband of the SWAP Imager on PROBA2, with a Comparison to TRACE, SOHO, STEREO, and SDO
Gallagher, Peter T.; Berghmans, David; Bloomfield, D. Shaun +3 more
We calculated the temperature response of the 171 Å passbands of the Sun Watcher using APS detectors and image Processing (SWAP) instrument onboard the PRoject for OnBoard Autonomy 2 (PROBA2) satellite. These results were compared to the temperature responses of the Extreme Ultraviolet Imaging Telescope (EIT) onboard the Solar and Heliospheric Obs…
The Fading of Two Transient Ultraluminous X-Ray Sources to below the Stellar Mass Eddington Limit
Soria, Roberto; Maccarone, Thomas J.; Raychaudhury, Somak +10 more
We report new detections of the two transient ultraluminous X-ray sources (ULXs) in NGC 5128 from an ongoing series of Chandra observations. Both sources have previously been observed Lx (2-3) × ~1039 erg s-1, at the lower end of the ULX luminosity range. The new observations allow us to study these sources in the …
X-Ray Spectral Cutoff and the Lack of Hard X-Ray Emission from Two Ultraluminous X-Ray Sources M81 X-6 and Holmberg IX X-1
Jithesh, V.; Misra, R.; Dewangan, G. C. +1 more
We present broadband X-ray spectral study of two ultraluminous X-ray sources (ULXs), M81 X-6 and Holmberg IX X-1, based on Suzaku and XMM-Newton observations. We perform joint broadband spectral analysis of the brightest sources in the field, i.e., the two ULXs and the active galactic nucleus (AGN) in M81, and demonstrate that the X-ray spectra of…