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NGC 2440 : A morpho-kinematical model
Costa, R. D. D.; Lago, P. J. A.
The 3D structure and position-velocity (P-V) diagrams of NGC 2440 were modeled aiming to describe the morphology of this object, specially its core. High resolution spectra, HST images and P-V diagrams were used to reproduce the 3D structure of the nebula using SHAPE. The best model for the nebula is a torus torn apart in three pieces by interacti…
A systematic search for lensed high-redshift galaxies in HST images of MACS clusters
Richard, J.; Ebeling, H.; Repp, A.
We present the results of a 135-arcmin2 search for high-redshift galaxies lensed by 29 clusters from the MAssive Cluster and extended MAssive Cluster Surveys. We use relatively shallow images obtained with the Hubble Space Telescope in four passbands, namely, F606W, F814W, F110W, and F140W. We identify 130 F814W dropouts as candidates f…
A Star-forming Ring around κ Ori 250 pc from the Sun
Megeath, S. T.; Pillitteri, I.; Wolk, S. J.
X-rays are a powerful probe of activity in early stages of star formation. They allow us to identify young stars even after they have lost the IR signatures of circumstellar disks and provide constraints on their distance. Here, we report on XMM-Newton observations that detect 121 young stellar objects (YSOs) in two fields between L1641 S and κ Or…
DR Tauri: Temporal variability of the brightness distribution in the potential planet-forming region
Wolf, S.; Ratzka, Th.; Brunngräber, R. +1 more
Aims: We investigate the variability of the brightness distribution and the changing density structure of the protoplanetary disk around DR Tau, a classical T Tauri star. DR Tau is known for its peculiar variations from the ultraviolet (UV) to the mid-infrared (MIR). Our goal is to constrain the temporal variation of the disk structure based …
The radio continuum spectrum of Mira A and Mira B up to submillimeter wavelengths
Planesas, P.; Alcolea, J.; Bachiller, R.
Aims: We present new measurements of the flux densities at submillimeter wavelengths based on ALMA band 7 (338 GHz, λ0.89 mm) and band 9 (679 GHz, λ0.44 mm) observations to better constrain the origin of the continuum emission of the Mira AB binary system and to check its orbit.
Methods: We have measured the Mira A and Mira B continuum i…
NuSTAR and XMM-Newton observations of the ultraluminous X-ray source NGC 5643 X-1
Krivonos, Roman; Sazonov, Sergey
We present a high-quality hard X-ray spectrum of the ultraluminous X-ray source (ULX) NGC 5643 X-1 measured with NuSTAR in 2014 May-June. We have obtained this spectrum by carefully separating the signals from the ULX and from the active nucleus of its host galaxyNGC 5643 located 0.8 arcmin away. Together with long XMM-Newton observations performe…
CME flux rope and shock identifications and locations: Comparison of white light data, Graduated Cylindrical Shell model, and MHD simulations
St. Cyr, O. C.; Gopalswamy, N.; Cairns, Iver H. +2 more
Coronal mass ejections (CMEs) are major transient phenomena in the solar corona that are observed with ground-based and spacecraft-based coronagraphs in white light or with in situ measurements by spacecraft. CMEs transport mass and momentum and often drive shocks. In order to derive the CME and shock trajectories with high precision, we apply the…
The soft X-ray spectrum of the high-mass X-ray binary V0332+53 in quiescence
Heinke, Craig O.; Elshamouty, Khaled G.; Chouinard, Rhys
The behaviour of neutron stars in high-mass X-ray binaries (HMXBs) during periods of low mass transfer is of great interest. Indications of spectral softening in systems at low mass-transfer rates suggest that some HMXBs are undergoing fundamental changes in their accretion regime, but the nature of the quiescent X-ray emission is not clear. We pe…
A Multiwavelength Characterization of Proto-brown-dwarf Candidates in Serpens
Riaz, B.; Gonzalez-Martin, O.; Caselli, P. +3 more
We present results from a deep submillimeter survey in the Serpens Main and Serpens/G3-G6 clusters, conducted with the Submillimetre Common-User Bolometer Array (SCUBA-2) at the James Clerk Maxwell Telescope. We have combined near- and mid-infrared spectroscopy, Herschel PACS far-infrared photometry, submillimeter continuum, and molecular gas line…
Transverse Velocity Shifts in Protostellar Jets: Rotation or Velocity Asymmetries?
De Colle, Fabio; Riera, Angels; Cerqueira, Adriano H.
Observations of several protostellar jets show systematic differences in radial velocity transverse to the jet propagation direction that have been interpreted as evidence of rotation in the jets. In this paper we discuss the origin of these velocity shifts, and show that they could originate from rotation in the flow, or from side-to-side asymmet…