Search Publications
Star-forming dwarf galaxies in the Virgo cluster: the link between molecular gas, atomic gas, and dust
Riguccini, L.; De Looze, I.; Hunt, L. K. +11 more
We present 12CO(1-0) and 12CO(2-1) observations of a sample of 20 star-forming dwarfs selected from the Herschel Virgo Cluster Survey, with oxygen abundances ranging from 12 + log (O / H) ~ 8.1 to 8.8. CO emission is observed in ten galaxies and marginally detected in another one. CO fluxes correlate with the FIR 250 µm…
Searching for the 3.5 keV Line in the Stacked Suzaku Observations of Galaxy Clusters
Bulbul, Esra; Markevitch, Maxim; Smith, Randall K. +5 more
We perform a detailed study of the stacked Suzaku observations of 47 galaxy clusters, spanning a redshift range of 0.01-0.45, to search for the unidentified 3.5 keV line. This sample provides an independent test for the previously detected line. We detect a 2σ -significant spectral feature at 3.5 keV in the spectrum of the full sample. When the sa…
Vertical structure and optical properties of Titan's aerosols from radiance measurements made inside and outside the atmosphere
Karkoschka, Erich; Tomasko, Martin G.; Anderson, Carrie M. +1 more
Prompted by the detection of stratospheric cloud layers by Cassini's Composite Infrared Spectrometer (CIRS; see Anderson, C.M., Samuelson, R.E. [2011]. Icarus 212, 762-778), we have re-examined the observations made by the Descent Imager/Spectral Radiometer (DISR) in the atmosphere of Titan together with two constraints from measurements made outs…
Broad [C II] Line Wings as Tracer of Molecular and Multi-phase Outflows in Infrared Bright Galaxies
Lutz, D.; Genzel, R.; Poglitsch, A. +13 more
We report a tentative correlation between the outflow characteristics derived from OH absorption at 119 µm and [C II] emission at 158 µm in a sample of 22 local and bright ultraluminous infrared galaxies (ULIRGs). For this sample, we investigate whether [C II] broad wings are a good tracer of molecular outflows, and how the two tracers…
Aerosol properties in the upper haze of Venus from SPICAV IR data
Vandaele, A. C.; Montmessin, F.; Fedorova, A. +5 more
SPICAV IR, a channel of the SPICAV/SOIR suite of instruments onboard Venus Express spacecraft measured spectra in nadir and solar occultation modes in the range of 0.65-1.7 µm. We report results from 222 solar occultations observed from May 2006 to November 2014. The vertical resolution of measurements varies from 1 to 25 km depending on the…
Time Dependent Nonequilibrium Ionization of Transition Region Lines Observed with IRIS
Martínez-Sykora, Juan; De Pontieu, Bart; Hansteen, Viggo H. +1 more
The properties of nonstatistical equilibrium ionization of silicon and oxygen ions are analyzed in this work. We focus on five solar targets (quiet Sun; coronal hole; plage; quiescent active region, AR; and flaring AR) as observed with the Interface Region Imaging Spectrograph (IRIS). IRIS is best suited for this work owing to the high cadence (up…
Constraints on cosmological birefringence from PLANCK and Bicep2/Keck data
Gruppuso, A.; Mandolesi, N.; Melchiorri, A. +4 more
The polarization of cosmic microwave background (CMB) can be used to constrain cosmological birefringence, the rotation of the linear polarization of CMB photons potentially induced by parity violating physics beyond the standard model. This effect produces non-null CMB cross correlations between temperature and B mode-polarization, and between E-…
Anisotropies in the HI gas distribution toward 3C 196
Kerp, J.; Kalberla, P. M. W.
Context. The local Galactic Hi gas was found to contain cold neutral medium (CNM) filaments that are aligned with polarized dust emission. These filaments appear to be dominated by the magnetic field and in this case turbulence is expected to show distinct anisotropies.
Aims: We use the Galactic Effelsberg-Bonn Hi Survey (EBHIS) to derive 2D …
The Local Black Hole Mass Function Derived from the MBH-P and the MBH-n Relations
Mutlu-Pakdil, Burçin; Davis, Benjamin L.; Seigar, Marc S.
We present a determination of the supermassive black hole (SMBH) mass function for early- and late-type galaxies in the nearby universe (z < 0.0057), established from a volume-limited sample consisting of a statistically complete collection of the brightest spiral galaxies in the southern hemisphere. The sample is defined by limiting luminosity…
The Distance to M104
Dolphin, Andrew E.; Skillman, Evan D.; Berg, Danielle +2 more
M104 (NGC 4594; the Sombrero galaxy) is a nearby, well-studied elliptical galaxy included in scores of surveys focused on understanding the details of galaxy evolution. Despite the importance of observations of M104, a consensus distance has not yet been established. Here, we use newly obtained Hubble Space Telescope optical imaging to measure the…