Search Publications
The twofold debris disk around HD 113766 A. Warm and cold dust as seen with VLTI/MIDI and Herschel/PACS
Absil, O.; Augereau, J. -C.; Henning, Th. +5 more
Context. Warm debris disks are a sub-sample of the large population of debris disks, and display excess emission in the mid-infrared. Around solar-type stars, very few objects (~2% of all debris disks) show emission features in mid-IR spectroscopic observations that are attributed to small, warm silicate dust grains. The origin of this warm dust c…
An outburst scenario for the X-ray spectral variability in 3C 111
Reynolds, C. S.; García, J.; Lohfink, A. +2 more
We present a combined Suzaku and Swift BAT broad-band E = 0.6-200 keV spectral analysis of three 3C 111 observations obtained in 2010. The data are well described with an absorbed power-law continuum and a weak (R ≃ 0.2) cold reflection component from distant material. We constrain the continuum cutoff at EC ≃ 150-200 keV, which is in a…
The Nearby, Young, Isolated, Dusty Star HD 166191
Hinkley, Sasha; Zuckerman, B.; Song, Inseok +4 more
We report an in-depth study of the F8-type star HD 166191, identified in an ongoing survey for stars exhibiting infrared emission above their expected photospheres in the Wide-field Infrared Survey Explorer all-sky catalog. The fractional IR luminosity measured from 3.5 to 70 µm is exceptionally high (L IR/L bol ~ 10%).…
Herschel imaging and spectroscopy of the nebula around the luminous blue variable star WRAY 15-751
Magain, P.; Nazé, Y.; Groenewegen, M. A. T. +5 more
We have obtained far-infrared Herschel-PACS imaging and spectroscopic observations of the nebular environment of the luminous blue variable (LBV) WRAY 15-751. The far-infrared images clearly show that the main, dusty nebula is a shell of radius 0.5 pc and width 0.35 pc extending outside the Hα nebula. Furthermore, these images reveal a second, big…
The spatial extent and distribution of star formation in 3D-HST mergers at z ∼ 1.5
Maseda, Michael V.; Schmidt, Kasper B.; Franx, Marijn +14 more
We present an analysis of the spatial distribution of star formation in a sample of 60 visually identified galaxy merger candidates at z > 1. Our sample, drawn from the 3D-HST survey, is flux limited and was selected to have high star formation rates based on fits of their broad-band, low spatial resolution spectral energy distributions. It inc…
XMM-Newton observation of the highly magnetized accreting pulsar Swift J045106.8-694803: evidence of a hot thermal excess
Bartlett, E. S.; Coe, M. J.; Ho, W. C. G.
Several persistent, low-luminosity (LX ∼ 1034 erg s-1), long-spin-period (P > 100 s) high-mass X-ray binaries have been reported with blackbody components with temperatures >1 keV. These hot thermal excesses have correspondingly small emitting regions (<1 km2) and are attributed to the neutron s…
A portrait of the extreme solar system object 2012 DR30
Pál, A.; Lellouch, E.; Müller, T. G. +15 more
2012 DR30 is a recently discovered solar system object on a unique orbit, with a high eccentricity of 0.9867, a perihelion distance of 14.54 AU, and a semi-major axis of 1109 AU, in this respect outscoring the vast majority of trans-Neptunian objects (TNOs). We performed Herschel/PACS and optical photometry to uncover the sizeand albedo…
About the Linearity of the Color-Magnitude Relation of Early-type Galaxies in the Virgo Cluster
Forte, Juan Carlos; Faifer, Favio R.; González, Nélida M. +1 more
We revisit the color-magnitude relation of Virgo Cluster early-type galaxies in order to explore its alleged nonlinearity. To this aim, we reanalyze the relation already published from data obtained within the ACS Virgo Cluster Survey of the Hubble Space Telescope and perform our own photometry and analysis of the images of 100 early-type galaxies…
Herschel CHESS discovery of the fossil cloud that gave birth to the Trapezium and Orion KL
Ceccarelli, C.; Dominik, C.; Caux, E. +4 more
Context. The Orion A molecular complex is a nearby (420 pc), very well studied stellar nursery that is believed to contain examples of triggered star formation.
Aims: As part of the Herschel guaranteed time key programme CHESS, we present the discovery of a diffuse gas component in the foreground of the intermediate-mass protostar OMC-2 FIR 4…
The dust SED of dwarf galaxies. I. The case of NGC 4214
Groves, B.; Relaño, M.; Lisenfeld, U. +3 more
Context. High-resolution data from Spitzer, Herschel, and Planck allow us to probe the entire spectral energy distribution (SED) of morphologically separated components of the dust emission from nearby galaxies and allow a more detailed comparison between data and models.
Aims: We wish to establish the physical origin of dust heating and emis…