Search Publications
Gas morphology and energetics at the surface of PDRs: New insights with Herschel observations of NGC 7023
Boulanger, F.; Martin, P. G.; France, K. +37 more
Context. We investigate the physics and chemistry of the gas and dust in dense photon-dominated regions (PDRs), along with their dependence on the illuminating UV field.
Aims: Using Herschel/HIFI observations, we study the gas energetics in NGC 7023 in relation to the morphology of this nebula. NGC 7023 is the prototype of a PDR illuminated b…
HIFI observations of water in the atmosphere of comet C/2008 Q3 (Garradd)
Blommaert, J. A. D. L.; Küppers, M.; Thomas, N. +42 more
High-resolution far-infrared and sub-millimetre spectroscopy of water lines is an important tool to understand the physical and chemical properties of cometary atmospheres. We present observations of several rotational ortho- and para-water transitions in comet C/2008 Q3 (Garradd) performed with HIFI on Herschel. These observations have provided t…
The youngest massive protostars in the Large Magellanic Cloud
van Loon, J. Th.; Okumura, K.; Hony, S. +19 more
We demonstrate the unique capabilities of Herschel to study very young luminous extragalactic young stellar objects (YSOs) by analyzing a central strip of the Large Magellanic Cloud obtained through the HERITAGE science demonstration program. We combine PACS 100 and 160, and SPIRE 250, 350, and 500 µm photometry with 2MASS (1.25-2.17 µ…
γ Cassiopeiae: an X-ray Be star with personality
Motch, C.; Smith, M. A.; Lopes de Oliveira, R.
An exciting unsolved problem in the study of high energy processes of early type stars concerns the physical mechanism for producing X-rays near the Be star γ Cassiopeiae. By now we know that this source and several “
A deep survey of the AKARI north ecliptic pole field . I. WSRT 20 cm radio survey description, observations and data reduction
Im, M.; Lee, H. M.; White, G. J. +17 more
Aims: The Westerbork Radio Synthesis Telescope, WSRT, has been used to make a deep radio survey of an ~1.7 degree2 field coinciding with the AKARI north ecliptic pole deep field. The observations, data reduction and source count analysis are presented, along with a description of the overall scientific objectives.
Methods: The…
The β Pictoris disk imaged by Herschel PACS and SPIRE
Heras, A. M.; Walker, H. J.; Ivison, R. J. +40 more
We obtained Herschel PACS and SPIRE images of the thermal emission of the debris disk around the A5V star β Pic. The disk is well resolved in the PACS filters at 70, 100, and 160 µm. The surface brightness profiles between 70 and 160 µm show no significant asymmetries along the disk, and are compatible with 90% of the emission between …
Testing adiabatic contraction of dark matter in fossil group candidates
Arnaud, M.; Pratt, G. W.; Zibetti, S. +3 more
We present deep XMM-Newton observations and ESO WFI optical imaging of two X-ray-selected fossil group candidates, RXC J0216.7-4749 and RXC J2315.7-0222. Using the X-ray data, we derive total mass profiles under the hydrostatic equilibrium assumption. The central regions of RXC J0216.7-4749 are found to be dominated by an X-ray bright AGN, and alt…
A sample of [C II] clouds tracing dense clouds in weak FUV fields observed by Herschel
Li, D.; Goldsmith, P. F.; Langer, W. D. +3 more
The [C ii] fine-structure line at 158 µm is an excellent tracer of the warm diffuse gas in the ISM and the interfaces between molecular clouds and their surrounding atomic and ionized envelopes. Here we present the initial results from Galactic observations of terahertz C+ (GOT C+), a Herschel key project devoted to studying the […
Spectro-photometric close pairs in GOODS-S: major and minor companions of intermediate-mass galaxies
Pérez-González, P. G.; López-Sanjuan, C.; Gallego, J. +3 more
Aims: Recent work has shown that major mergers of disc galaxies can only account for 20% of the growth of the galaxy red sequence between z = 1 and z = 0. Our goal here is to provide merger frequencies that encompass both major and minor mergers, derived from close pair statistics. We aim to show that reliable close pair statistics can be der…
GAS in Protoplanetary Systems (GASPS). I. First results
Pinte, C.; Ménard, F.; Duchêne, G. +49 more
Context. Circumstellar discs are ubiquitous around young stars, but rapidly dissipate their gas and dust on timescales of a few Myr. The Herschel Space Observatory allows for the study of the warm disc atmosphere, using far-infrared spectroscopy to measure gas content and excitation conditions, and far-IR photometry to constrain the dust distribut…