... Bojan Nikolic web pages (r. 329) . Galaxy Evolution . ... By comparing narrow band spectral line indices with recent models of simple stellar populations (SSPs) we investigate trends in the star formation history as a function of galaxy mass (velocity dispersion), density of environment and galactic radius. ... MJD of the SDSS observation of the galaxy . ... The history of star formation and mass assembly in early-type galaxies . ... Copyright 2005 -- 2016, Bojan Nikolic feedback welcome ...

... Next: The PROS Big Up: Software Systems Previous: Data Reduction Software . ... The srcinten task provides PROS users with a tool to compute count rates for point sources in the ROSAT High Resolution Imager (HRI). ... Corrected upper limits are cited at locations where the count rate falls below the source detection threshold. ... Srcinten is a new PROS task that computes and applies the above correction factors to the net counts in a user-specified aperture. ...

... III (OCR by CDS, corrections by H.Andernach) The first results of a search at 1410 MHz for 243 extragalactic objects from the Southern Hemisphere identified as quasars by Veron-Cetty Veron (1983) in "A Catalogue of extragalactic Radio-Source Identifications" are reported. ... The data are from Parkes catalogue . ... These data were modified using 'A catalogue of Quasars and Active Nuclei (2nd Ed.)' (1985), 'A catalogue of Quasars and Active Nuclei (3rd Ed.)', (1980), all of them by Veron-Cetty Veron...

... ATCA HI and radio continuum observations of the peculiar southern galaxy IC2554 and its surroundings reveal typical signatures of an interacting galaxy group. We detected a large HI cloud between IC2554 and the elliptical galaxy NGC3136B. The gas dynamics in IC2554 itself, which is sometimes described as a colliding pair, are surprisingly regular, whereas NGC3136B was not detected. ... The total HI mass of the IC2554 system is approx. 2 x 10 9 Msun, a third of which resides in the HI cloud. ...

... Scott Anderson, University of Washington . ... Abstract . ... Infrared Snapshots of 3CR Radio Galaxies . ... Over the past several cycles, many 3CR galaxies have been observed at a variety of wavelengths by HST. ... This proposal triggers with the detection of an appropriate burst by the Swift satellite, and couples multicolour HST ACS imaging with ground-based radio and optical follow-up observations to track its evolution over the following ~300 days. ... Past weeks: . ...

... I present results from several seasons of photometric observations of X--ray sources in the Orion OB1a and OB1b star formation regions. The initial goal was to measure the rotational periods of several dozen pre--main sequence (PMS) stars. ... Infrared and optical data confirm that 90% of the X--ray sources are PMS and about 10% of the PMS stars may have disks. ... I find rotation periods for five stars at confidence of greater than 99.9/ greater than 99/ at much lower confidence. ...

XMM-Newton Science Analysis System Page: 1 om atindex August 15, 2005 Abstract Create/maintain an index of OM at- eld data 1 Instruments/Modes Instrument Mode OM Slew 2 Use pipeline processing yes interactive analysis no 3 Description This task creates and maintains an index of an archive of OM at- eld calibration data which is used by the pipeline. ... The task can be run in two modes, create and insert. In create mode a new, empty at- eld archive index is created. ... Archive index 2. ...

... We present the results of an interferometric and single-dish study of G24.78+0.08, a region associated with high-mass star formation. ... We suggest that the embedded stars might be too young to have affected the surrounding molecular cloud significantly on a large scale. ... We assess that the (proto)stellar cluster lies at the center of a molecular clump with diameter of ~2 pc: to a good approximation this may be described as a spherically symmetric clump with density profile of the type n~R^(-1.8...

Find Similar Abstracts . ... 26, Jan. 1983, p. 77-83. ... CAUSTICS (OPTICS), COSMOLOGY, PARTICLE MOTION, GEOMETRICAL OPTICS, GRAVITATIONAL EFFECTS, UNIVERSE . ... The analogy between caustics in geometrical optics and the singularities that arise in irrotational flows in a cold collisionless medium is discussed. ... Use: Authors Title Abstract Text Text Query with Keywords Return: Query Results Query Form Database: Astronomy Instrumentation Physics and Geophysics ABSTRACT QUERY USER FEEDBACK HELP ...