215 citations · 1.6k across the 63 of their papers we have counts for
15 papers · 1 filter
Mechanical feedback in the molecular ISM of luminous IR galaxies
A. F. Loenen, M. Spaans, W. A. Baan +1
Aims: Molecular emission lines originating in the nuclei of luminous infra-red galaxies are used to determine the physical properties of the nuclear ISM in these systems. Methods:…
Detecting orbital angular momentum in radio signals
H. Then, B. Thidé, J. T. Mendonça +5
Electromagnetic waves with an azimuthal phase shift are known to have a well defined orbital angular momentum. Different methods that allow for the detection of the angular momentu…
Dense gas in luminous infrared galaxies
W. A. Baan, C. Henkel, A. F. Loenen +2
Molecules that trace the high-density regions of the interstellar medium have been observed in (ultra-)luminous (far-)infrared galaxies, in order to initiate multiple-molecule mult…
Opportunities for maser studies with the Square Kilometre Array
A. J. Green, W. A. Baan
The Square Kilometre Array (SKA) is the radio telescope of the next generation, providing an increase in sensitivity and angular resolution of two orders of magnitude over existing…
Arp 220 - IC 4553/4: understanding the system and diagnosing the ISM
W. A. Baan
Arp220 is a nearby system in final stages of galaxy merger with powerful ongoing star-formation at and surrounding the two nuclei. Arp 220 was detected in HI absorption and OH Mega…
The irradiated ISM of ULIRGs
M. Spaans, R. Meijerink, F. P. Israel +2
The nuclei of ULIRGs harbor massive young stars, an accreting central black hole, or both. Results are presented for molecular gas that is exposed to X-rays (1-100 keV, XDRs) and f…
Molecular properties of (U)LIRGs: CO, HCN, HNC and HCO+
A. F. Loenen, W. A. Baan, M. Spaans
The observed molecular properties of a sample of FIR-luminous and OH megamaser (OH-MM) galaxies have been investigated. The ratio of high and low-density tracer lines is found to b…
HI and OH Absorption toward NGC6240
Willem A. Baan, Yoshiaki Hagiwara, Peter Hofner
VLA observations of large-scale HI and OH absorption in the merging galaxy of NGC6240 are presented with 1 arcsec resolution. HI absorption is found across large areas of the exten…
Diagnostics of active galaxies: I. Modeling the infrared properties of dusty cores of starburst galaxies
A. F. Loenen, W. A. Baan, M. Spaans
An evolutionary model of star formation in ULIRGs was created using existing star formation and radiative transfer codes (STARBURST99, RADMC and RADICAL) as building blocks. The re…
A Deep WSRT 1.4 GHz Radio Survey of the Spitzer Space Telescope FLSv Region
R. Morganti, M. A. Garrett, S. Chapman +3
The First Look Survey (FLS) is the first scientific product to emerge from the Spitzer Space Telescope. A small region of this field (the verification strip) has been imaged very d…
An embedded circumnuclear disk in Mrk 273
Hans-Rainer Kl"ockner, Willem A. Baan
Radio observations using very long baseline interferometry (VLBI) and the Westerbork interferometer have been carried out to study the hydroxyl Megamaser emission in Mrk~273 at dif…
VLBI imaging of OH absorption: The puzzle of the nuclear region of NGC 3079
Y. Hagiwara, H. -R. Kloeckner, W. Baan
Broad hydroxyl (OH) absorption-lines in the 1667 MHz and 1665 MHz transition towards the central region of NGC 3079 have been observed at high resolution with the European VLBI Net…
A search for extragalactic H2O maser emission towards IRAS galaxies II - Discovery of an H2O maser in the Seyfert 1 galaxy NGC 4051
Yoshiaki Hagiwara, Philip J Diamond, Makoto Miyoshi +2
Water vapor maser emission in the 6_{16}-5_{23} transition towards the narrow-line Seyfert 1 (NLS1) galaxy NGC 4051 has been discovered during an ongoing single-dish extragalactic…
Investigation of the obscuring circumnuclear torus in the active galaxy Mrk231
Hans-Rainer Kl"ockner, Willem A. Baan, Michael A. Garrett
Here we report on observations of powerful hydroxyl (OH) line emissions that trace the obscuring material within the circumnuclear environment of the galaxy Markarian 231. The hydr…
AGN and starbursts at high redshift: High resolution EVN radio observations of the Hubble Deep Field
M. A. Garrett, T. W. B. Muxlow, S. T. Garrington
We present deep, wide-field European VLBI Network (EVN) 1.6 GHz observations of the Hubble Deep Field (HDF) region with a resolution of 0.025 arcseconds. Above the 210 microJy/beam…