Search Publications
Atomic hydrogen bridge fueling NGC 4418 with gas from VV 655
Privon, G. C.; Aalto, S.; Klöckner, H. -R. +6 more
Context. The galaxy
IGR J17445-2747—Yet another X-ray burster in the galactic bulge
Sunyaev, R. A.; Grebenev, S. A.; Mereminskiy, I. A.
The discovery of a type I X-ray burst from the faint unidentified transient source IGR J17445-2747 in the Galactic bulge by the JEM-X telescope onboard the INTEGRAL observatory is reported. Type I bursts are believed to be associated with thermonuclear explosions of accreted matter on the surface of a neutron star with a weak magnetic field in a l…
Near-infrared Spectroscopy of Five Ultra-massive Galaxies at 1.7 < z < 2.7
Muzzin, Adam; Labbé, Ivo; Quadri, Ryan +13 more
We present the results of a pilot near-infrared spectroscopic campaign of five very massive galaxies ({log}({M}\star /{M}⊙ )> 11.45) in the range of 1.7< z< 2.7. We measure an absorption feature redshift for one galaxy at {z}{spec}=2.000+/- 0.006. For the remaining galaxies, we combine the photometry with …
Automatic Near-Real-Time Detection of CMEs in Mauna Loa K-Cor Coronagraph Images
St. Cyr, O. C.; Burkepile, J. T.; Posner, A. +1 more
A simple algorithm has been developed to detect the onset of coronal mass ejections (CMEs), together with speed estimates, in near-real time using linearly polarized white-light solar coronal images from the Mauna Loa Solar Observatory K-Cor telescope. Ground observations in the low corona can warn of CMEs well before they appear in space coronagr…
Charge exchange in the ultraviolet: implication for interacting clouds in the core of NGC 1275
Baum, Stefi A.; O'Dea, Christopher P.; Gu, Liyi +3 more
Context. Charge exchange emission is known to provide a key diagnostic to the interface between hot and cold matter in many astrophysical environments. Most of the recent charge exchange studies focus on its emission in the X-ray band; only a few focus on the UV, even though it can also provide a powerful probe of the charge exchange process.
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HD 240121 - An ACV variable showing anti-phase variations of the B and V light curves
Paunzen, Ernst; Gröbel, Rainer; Hümmerich, Stefan +1 more
The variability of HD 240121 = BD+59 2602 was first suspected by Särg and Wramdemark (1970) and later confirmed by Gröbel R. (1992a,b). Because of the observed anti-phase variations of the B and V light curves, the latter author tentatively suggested an ACV type. Apart from its inclusion in the catalog of New Suspected Variables (NSV 25977), no fu…
Propagation and Interaction Properties of Successive Coronal Mass Ejections in Relation to a Complex Type II Radio Burst
Liu, Ying D.; Zhao, Xiaowei; Zhu, Bei
We examine the propagation and interaction properties of three successive coronal mass ejections (CMEs) from 2001 November 21-22, with a focus on their connection with the behaviors of the associated long-duration complex type II radio burst. In combination with coronagraph and multi-point in situ observations, the long-duration type II burst prov…
Influence of the Ambient Electric Field on Measurements of the Actively Controlled Spacecraft Potential by MMS
Andriopoulou, M.; Nakamura, R.; Torbert, R. B. +5 more
Space missions with sophisticated plasma instrumentation such as Magnetospheric Multiscale, which employs four satellites to explore near-Earth space benefit from a low electric potential of the spacecraft, to improve the plasma measurements and therefore carry instruments to actively control the potential by means of ion beams. Without control, t…
Infrared polarimetry of Mrk 231: scattering off hot dust grains in the central core
Siebenmorgen, R.; Telesco, C. M.; Packham, C. +13 more
We present high-angular (0.17-0.35 arcsec) resolution imaging polarimetric observations of Mrk 231 in the 3.1 µm filter using MMT-Pol on the 6.5-m MMT, and in the 8.7, 10.3, and 11.6 µm filters using CanariCam on the 10.4-m Gran Telescopio CANARIAS. In combination with already published observations, we compile the 1-12 µm total …
Modeling a Propagating Sawtooth Flare Ribbon Structure as a Tearing Mode in the Presence of Velocity Shear
Longcope, Dana; Parker, Jacob
On 2014 April 18 (SOL2014-04-18T13:03), an M-class flare was observed by IRIS. The associated flare ribbon contained a quasi-periodic sawtooth pattern that was observed to propagate along the ribbon, perpendicular to the IRIS spectral slit, with a phase velocity of ∼15 km s-1. This motion resulted in periodicities in both intensity and …