Other
Scientific paper
Mar 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasp..107..301s&link_type=abstract
Publications of the Astronomical Society of the Pacific, v.107, p.301
Other
1
Scientific paper
The longitude range 90 degrees <= l <= 110 degrees near the galactic plane is characterized by two interesting features. Firstly, the northern galactic warp shows its north-most bending. Secondly, the Perseus arm and a spiral arm beyond it (first detected in HI) is located in that region. So the starting point of the thesis has been a galactic one: While searching for optical spiral tracers beyond the Perseus arm by concentrating on high transparency regions I noticed an unexpectedly high number of galaxies at low latitudes. On POSS-E-prints I systematically searched for galaxies in the region 90 degrees <= l <= 110 degrees, -10 degrees <= b <= +10 degrees and found more than 1300 mostly uncatalogued galaxies. The survey was done using a binocular microscope at 16-fold magnification. This method allows to include also elliptical galaxies. I have discussed pros and cons of other search strategies like 21cm blind searches or IRAS-flux criteria methods. The smallest diameters of the galaxies are 0.1' For diameters larger than 0.4' the catalogue is complete. 5.5% of the galaxies proved to be IRAS-point sources. The significant north-south asymmetry in the number density has been shown to originate in the galactic extinction distribution. A new cluster of galaxies at a velocity of about 5200 km/s at (l,b) = (106 degrees, -6 degrees) has been detected. The investigated part of the sky marks the northwestern end of the Pisces-Perseus-Supercluster near the galactic plane. A review on the various connections between Pisces-Perseus to other clusters is given. In a joint program with W.K. Huchtmeier from the MPIfR at Bonn, radial velocities, line widths and HI-masses of 57 galaxies have been measured at the Effelsberg 100m radio telescope. With the 1.93m telescope at the OHP I got 33 optical spectra and determined radial velocities. I could trace the PPScl. to at least b = -5 degrees. From literature data, a long chain of galaxies covering all the first galactic quadrant is visible. It runs almost parallel to the galactic equator and at moderate latitudes. The new radial velocities indicate that this chain extends to l = 107 degrees, b = -5 degrees. We classified CGCG 493-2 as a new Seyfert 1.5 galaxy. The 'compact galaxy' UGC 11823 is in fact a star of late spectral type. As a byproduct a number of new galactic objects (like planetary nebulae, bipolar nebulae, HII-regions, SNR's) have been found. (SECTION: Dissertation Summaries)
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