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15 papers · 2 filters
A Thickness of Stellar Disks of Edge-on Galaxies and Position of Their Truncation Radii
A. V. Zasov, D. V. Bizyaev
The relationship between the geometrical properties of stellar disks (a flatness and truncation radius) and the disk kinematics are considered for edge-on galaxies. It is shown tha…
Helium and Hydrogen Line Ratios and The Stellar Content of Compact HII Regions
S. L. Lumsden, P. J. Puxley, M. G. Hoare +2
We present observations and models of the behaviour of the HI and HeI lines between 1.6 and 2.2um in a small sample of compact HII regions. As in our previous papers on planetary n…
Simulating Observations of Dark Matter Dominated Galaxies: Towards the Optimal Halo Profile
W. J. G. de Blok, A. Bosma, S. S. McGaugh
Low Surface Brightness (LSB) galaxies are dominated by dark matter, and their rotation curves thus reflect their dark matter distribution. Recent high-resolution rotation curves su…
A deep VLA survey at 6 cm in the Lockman Hole
P. Ciliegi, G. Zamorani, G. Hasinger +3
We have obtained a deep radio image with the Very Large Array at 6 cm in the Lockman Hole. The noise level in the central part of the field is about 11 microJy. From these data we…
Interstellar H_2 in M 33 detected with FUSE
Hartmut Bluhm, Klaas S. de Boer, Ole Marggraf +2
FUSE spectra of the four brightest H II regions in M 33 show absorption by interstellar gas in the Galaxy and in M 33. On three lines of sight molecular hydrogen in M 33 is detecte…
Probing the structure of a birthplace of intermediate-mass stars: Ammonia cores in Lynds 1340
M. Kun, J. G. A. Wouterloot, L. V. T'oth
Lynds 1340, a molecular cloud forming intermediate-mass stars, has been mapped in the NH_3(1,1) and (2,2) transitions with the Effelsberg 100m telescope. We observed the whole area…
A High-Resolution Rotation Curve of NGC 6822: A Test-case for Cold Dark Matter
David Weldrake, Erwin de Blok, Fabian Walter
We present high resolution rotation curves of the local group dwarf irregular galaxy NGC 6822 obtained with the Australia Telescope Compact Array. Our best curves have an angular r…
Timing analysis of the Seyfert-1 galaxy MCG-6-30-15 with XMM-Newton data
N. La Palombara, S. Molendi, J. Wilms +1
We present the main results of a deep timing analysis (in the 0.2-10 keV energy band) of the bright Seyfert-1 galaxy MCG-6-30-15 performed on XMM-Newton data. The light-curves and…
The Central Parsecs of the Bright Quasar PKS 1921 - 293
Z. -Q. Shen, J. M. Moran, K. I. Kellermann
We report on a VLBA imaging study of the nearby bright southern blazar PKS 1921 - 293 (OV - 236). High resolution VLBA observations, made at four frequencies (5, 12, 15, and 43 GHz…
The low mas end of the young cluster IC2391
David Barrado y Navascues, John R. Stauffer
By collecting optical and infrared photometry, as well as medium resolution spectroscopy, we have discovered a sample of low mass stars and brwon dwarfs in the young cluster IC2391…
Star Formation Processes versus Planet Formation Processes
Shiv S. Kumar
The processes of star formation are fundamentally different from those of planet formation. Since the mass of a very-low-mass object alone doesn't allow us to uniquely determine it…
Compton Heated Outflow from CDAFs
Myeong-Gu Park, Jeremiah P. Ostriker
Convection-dominated accretion flows (CDAF) are expected to have a shallower density profile and a higher radiation efficiency as compared to advection-dominated accretion flows (A…
VLA Detection of RRLs from the radio nucleus of NGC 253 : Ionization by a weak AGN, an obscured SSC or a compact SNR ?
Niruj R. Mohan, K. R. Anantharamaiah, W. M. Goss
We have imaged the H92alpha and H75alpha radio recombination line (RRL) emissions from the starburst galaxy NGC 253 with a resolution of ~4 pc. The peak of the RRL emission at both…
XMM-Newton and Wide Field Optical Imaging to crack the mystery of unidentified gamma-ray sources
P. A. Caraveo, A. De Luca, N. La Palombara +5
The limited angular resolution of gamma-ray telescopes prevents the straight identification of the majority of the sources detected so far. While the only certified galactic gamma-…
The low-mass young stellar population in Orion OB1
Cesar Briceño, Nuria Calvet, Anna K. Vivas +2
We present recent results from our ongoing large scale variability survey of the Orion OB1 Association. In an area of ~ 25 square degrees we have unveiled new populations of low-ma…