Search Publications
Strong absorption by interstellar hydrogen fluoride: Herschel/HIFI observations of the sight-line to G10.6-0.4 (W31C)
Menten, K. M.; Perault, M.; Boulanger, F. +45 more
We report the detection of strong absorption by interstellar hydrogen fluoride along the sight-line to the submillimeter continuum source G10.6-0.4 (W31C). We have used Herschel's HIFI instrument, in dual beam switch mode, to observe the 1232.4763 GHz J = 1-0 HF transition in the upper sideband of the Band 5a receiver. The resultant spectrum shows…
Mapping the column density and dust temperature structure of IRDCs with Herschel
Bernard, J. -P.; Montier, L.; Ristorcelli, I. +22 more
Infrared dark clouds (IRDCs) are cold and dense reservoirs of gas potentially available to form stars. Many of these clouds are likely to be pristine structures representing the initial conditions for star formation. The study presented here aims to construct and analyze accurate column density and dust temperature maps of IRDCs by using the first…
Panoramic Hα and mid-infrared mapping of star formation in a z = 0.8 cluster
Shimasaku, Kazuhiro; Koyama, Yusei; Kodama, Tadayuki +4 more
We present the first wide-field Hα imaging survey around the distant cluster RXJ1716.4+6708 at z = 0.81 with a narrow-band filter on MOIRCS/Subaru, which reveals the star formation activities down to a star formation rate (SFR) of ~1Msolaryr-1 without extinction correction. Combining with a wide-field mid-infrared (MIR) imagi…
Studying the Physical Diversity of Late-M Dwarfs with Dynamical Masses
Helling, Christiane; Cushing, Michael C.; Dupuy, Trent J. +4 more
We present a systematic study of the physical properties of late-M dwarfs based on high-quality dynamical mass measurements and near-infrared (NIR) spectroscopy. We use astrometry from Keck natural and laser guide star adaptive optics imaging to determine orbits for the late-M binaries LP 349 - 25AB (M7.5+M8), LHS 1901AB (M6.5+M6.5), and Gl 569Bab…
Cluster galaxies in XMMU J2235-2557: galaxy population properties in most massive environments at z ~ 1.4
Böhringer, H.; Demarco, R.; Pannella, M. +18 more
We present a multi-wavelength study of galaxy populations in the core of the massive, X-ray luminous cluster XMMU J2235 at z=1.39, based on high quality VLT and HST photometry at optical and near-infrared wavelengths. We derive luminosity functions in the z, H, and Ks bands, approximately corresponding to restframe U, R and z band. Thes…
X-ray Variability and Evidence for Pulsations from the Unique Radio Pulsar/X-ray Binary Transition Object FIRST J102347.6+003841
Ransom, Scott M.; Kaspi, Victoria M.; Bogdanov, Slavko +4 more
We report on observations of the unusual neutron-star binary system FIRST J102347.6+003841 carried out using the XMM-Newton satellite. This system consists of a radio millisecond pulsar (PSR J1023+0038) in a 0.198 day orbit with a ~0.2 M sun Roche-lobe-filling companion and appears to have had an accretion disk in 2001. We observe a har…
Calibrating the Correlation Between Black Hole Mass and X-ray Variability Amplitude: X-ray Only Black Hole Mass Estimates for Active Galactic Nuclei and Ultra-luminous X-ray Sources
Zhang, Shuang-Nan; Zhou, Xin-Lin; Zhu, Ling +1 more
A calibration is made for the correlation between the X-ray Variability Amplitude (XVA) and black hole (BH) mass. The correlation for 21 reverberation-mapped Active Galactic Nuclei (AGNs) appears very tight, with an intrinsic dispersion of 0.20 dex. The intrinsic dispersion of 0.27 dex can be obtained if BH masses are estimated from the stellar ve…
Shell thickness variations and the long-wavelength topography of Titan
Nimmo, F.; Bills, B. G.
The long-wavelength topography of Titan has an amplitude larger than that expected from tidal and rotational distortions at its current distance from Saturn. This topography is associated with small gravity anomalies, indicating a high degree of compensation. Both observations can be explained if Titan has a floating, isostatically-compensated ice…
Feedback under the microscope-II. Heating, gas uplift and mixing in the nearest cluster core
Böhringer, H.; Simionescu, A.; Churazov, E. +11 more
Using a combination of deep (574 ks) Chandra data, XMM-Newton high-resolution spectra and optical Hα+[NII] images, we study the nature and spatial distribution of the multi-phase plasma in M87. Our results provide direct observational evidence of `radio-mode' active galactic nuclei (AGN) feedback in action, stripping the central galaxy of its lowe…
Herschel/HIFI discovery of interstellar chloronium (H2Cl+)
Menten, K. M.; Falgarone, E.; Martin, P. G. +102 more
We report the first detection of chloronium, H2Cl+, in the interstellar medium, using the HIFI instrument aboard the Herschel Space Observatory. The 212-101 lines of ortho-H_235Cl+ and ortho-H_237Cl+ are detected in absorption towards NGC 6334I, and the 11…