Search Publications
Star Formation and Feedback: A Molecular Outflow-Prestellar Core Interaction in L1689N
Roueff, E.; Pagani, L.; Lis, D. C. +5 more
We present Herschel,11 ALMA Compact Array (ACA), and Caltech Submillimeter Observatory observations of the prestellar core in L1689N, which has been suggested to be interacting with a molecular outflow driven by the nearby solar-type protostar IRAS 16293-2422. This source is characterized by some of the highest deuteration levels observ…
Evidence for an evolving cyclotron line energy in 4U 1538-522
Hemphill, Paul B.; Rothschild, Richard E.; Fürst, Felix +6 more
We have performed a full time and luminosity-resolved spectral analysis of the high-mass X-ray binary 4U 1538-522 using the available RXTE, INTEGRAL, and Suzaku data, examining both phase-averaged and pulse-phase-constrained data sets and focusing on the behaviour of the cyclotron resonance scattering feature (CRSF). No statistically significant t…
Quasars can be used to verify the parallax zero-point of the Tycho-Gaia Astrometric Solution
Michalik, Daniel; Lindegren, Lennart
Context. The Gaia project will determine positions, proper motions, and parallaxes for more than one billion stars in our Galaxy. It is known that Gaia's two telescopes are affected by a small but significant variation of the basic angle between them. Unless this variation is taken into account during data processing, e.g. using on-board metrology…
The "Alfvénic surge" at substorm onset/expansion and the formation of "Inverted Vs": Cluster and IMAGE observations
Frey, H. U.; Goldstein, M. L.; Mozer, F. S. +4 more
From multipoint, in situ observations and imaging, we reveal the injection-powered, Alfvénic nature of auroral acceleration during onset and expansion of a substorm. It is shown how Alfvénic variations over time dissipate to form large-scale, inverted-V structures characteristic of quasistatic aurora. This characterization is made possible through…
On the covering fraction variability in an EUV mini-BAL outflow from PG 1206+459
Muzahid, S.; Srianand, R.; Charlton, J. +1 more
We report on the first detection of extreme-ultraviolet (EUV) absorption variability in the Ne VIII λλ770, 780 mini-broad absorption line (mini-BAL) in the spectrum of the quasar (QSO) PG 1206+459. The observed equivalent width (EW) of the Ne VIII doublet shows a ∼4σ variation over a time-scale of 2.8 months in the QSO's rest frame. Both members o…
SDSS J163459.82+204936.0: A Ringed Infrared-luminous Quasar with Outflows in Both Absorption and Emission Lines
Lyu, Jianwei; Shu, Xinwen; Ji, Tuo +9 more
SDSS J163459.82+204936.0 is a local (z = 0.1293) infrared-luminous quasar with L IR = 1011.91 {L}⊙ . We present a detailed multiwavelength study of both the host galaxy and the nucleus. The host galaxy, appearing as an early-type galaxy in the optical images and spectra, demonstrates violent, obscured star formatio…
INTEGRAL study of temporal properties of bright flares in Supergiant Fast X-ray Transients
Sidoli, L.; Postnov, K.; Paizis, A.
We have characterized the typical temporal behaviour of the bright X-ray flares detected from the three Supergiant Fast X-ray Transients (SFXTs) showing the most extreme transient behaviour (XTE J1739-302, IGR J17544-2619, SAX J1818.6-1703). We focus here on the cumulative distributions of the waiting-time (time interval between two consecutive X-…
The Blob Connection: Searching for Low Coronal Signatures of Solar Post-CME Blobs
Reeves, Katharine K.; Webb, David F.; Schanche, Nicole E.
Bright linear structures, thought to be indicators of a current sheet (CS), are often seen in Large Angle and Spectrometric Coronagraph (LASCO) on the Solar and Heliospheric Observatory (SOHO) white-light data in the wake of coronal mass ejections (CMEs). In a subset of these post-CME structures, relatively bright blobs are seen moving outward alo…
The 3XMM/SDSS Stripe 82 Galaxy Cluster Survey. I. Cluster catalogue and discovery of two merging cluster candidates
Takey, A.; Durret, F.; Mahmoud, E. +1 more
We present a galaxy cluster survey based on XMM-Newton observations that are located in Stripe 82 of the Sloan Digital Sky Survey (SDSS). The survey covers an area of 11.25 deg2. The X-ray cluster candidates were selected as serendipitously extended detected sources from the third XMM-Newton serendipitous source catalogue (3XMM-DR5). A …
Surface ages of mid-size saturnian satellites
Di Sisto, Romina P.; Zanardi, Macarena
The observations of the surfaces of the mid-sized saturnian satellites made by Cassini-Huygens mission have shown a variety of features that allows study of the processes that took place and are taking place on those worlds. Research of the saturnian satellite surfaces has clear implications not only for Saturn's history and Saturn's surroundings,…