Search Publications
Analysis of Titan CH 4 3.3 µm upper atmospheric emission as measured by Cassini/VIMS
Funke, Bernd; García-Comas, Maya; Coradini, Angioletta +5 more
After molecular nitrogen, methane is the most abundant species in Titan's atmosphere and plays a major role in its energy budget and its chemistry. Methane has strong bands at 3.3 µm emitting mainly at daytime after absorption of solar radiation. This emission is strongly affected by non-local thermodynamic equilibrium (non-LTE) in Titan's u…
Calibration of BVRI Photometry for the Wide Field Channel of the HST Advanced Camera for Surveys
Dolphin, Andrew E.; Shaw, Richard A.; Saha, Abhijit +1 more
We present new observations of two Galactic globular clusters, PAL4 and PAL14, using the Wide Field Channel of the Advanced Camera for Surveys (ACS) on board the Hubble Space Telescope (HST) and reanalyze archival data from a third, NGC2419. We matched our photometry of hundreds of stars in these fields from the ACS images to existing ground-based…
Reverberation Mapping of the Intermediate-mass Nuclear Black Hole in SDSS J114008.71+030711.4
Kaspi, Shai; Kollatschny, Wolfram; Behar, Ehud +2 more
We present the results of a reverberation mapping (RM) campaign on the black hole (BH) associated with the active galactic nucleus (AGN) in SDSS J114008.71+030711.4 (hereafter GH08). This object is selected from a sample of 19 candidate intermediate-mass BHs (M BH < 106 M sun) found by Greene & Ho in the Slo…
The TeV Binary HESS J0632+057 in the Low and High X-Ray State
Rea, Nanda; Torres, Diego F.
We report on a 40 ks Chandra observation of the TeV emitting high-mass X-ray binary HESS J0632+057 performed in 2011 February during a high state of X-ray and TeV activity. We have used the ACIS-S camera in continuous clocking mode to search for a possible X-ray pulsar in this system. Furthermore, we compare the emission of the source during this …
Comparison of accelerated ion populations observed upstream of the bow shocks at Venus and Mars
Coates, A. J.; Fedorov, A.; Barabash, S. +12 more
Foreshock ions are compared between Venus and Mars at energies of 0.6~20 keV using the same ion instrument, the Ion Mass Analyser, on board both Venus Express and Mars Express. Venus Express often observes accelerated protons (2~6 times the solar wind energy) that travel away from the Venus bow shock when the spacecraft location is magnetically co…
The First MAXI/GSC Catalog in the High Galactic-Latitude Sky
Isobe, Naoki; Yamaoka, Kazutaka; Nakagawa, Yujin E. +31 more
We present the first unbiased source catalog of the Monitor of All-sky X-ray Image (MAXI) mission at high Galactic latitudes (
Discovery of a broad O VIII Lyα line in the ultracompact X-ray binary 4U 1543-624
Jonker, P. G.; Madej, O. K.
We report the discovery of a broad emission feature at ∼0.7 keV in the spectra of the ultracompact X-ray binary 4U 1543-624, obtained with the high-resolution spectrographs of the XMM-Newton and Chandra satellites. We confirm the presence of the feature in the broad-band MOS2 spectrum of the source. As suggested before in the literature, the donor…
The Faintest Radio Source Yet: Expanded Very Large Array Observations of the Gravitational Lens SDSS J1004+4112
Jackson, N.
We present new radio observations of the large-separation gravitationally lensed quasar SDSS J1004+4112, taken in a total of 6 hr of observations with the Expanded Very Large Array. The maps reach a thermal noise level of approximately 4 µJy. We detect four of the five lensed images at the 15-35 µJy level, representing a source of intr…
A deep spectroscopic study of the filamentary nebulosity in NGC 4696, the brightest cluster galaxy in the Centaurus cluster
Fabian, A. C.; Ferland, G. J.; Sanders, J. S. +4 more
We present results of deep integral-field spectroscopy observations using high-resolution optical (4150-7200 Å) VLT VIsible MultiObject Spectrograph spectra of NGC 4696, the dominant galaxy in the Centaurus cluster (Abell 3526). After the Virgo cluster, this is the second nearest (z= 0.0104) example of a cool-core cluster. NGC 4696 is surrounded b…
Cassini VIMS observations of latitudinal and hemispheric variations in Saturn’s infrared auroral intensity
Baines, Kevin H.; Kasahara, Satoshi; Brown, Robert H. +6 more
The intensity of Saturn’s infrared H3+ aurora is investigated using Cassini VIMS images acquired during October 2006-February 2009. Polar and main oval auroral regions were defined in both hemispheres, which extend between 0-10° and 10-25° co-latitude, respectively. Average intensities were computed for these regions and compared. While the northe…