... Printed in U.S.A. NATURE OF NUCLEAR RINGS IN UNBARRED GALAXIES : NGC 7742 AND NGC 7217 O. K. Sil'chenko and A. V. Moiseev Special Astrophysical Observatory, Nizhnij Arkhyz 369167, Russia; moisav@sao.ru Received 2005 ... Isaac Newton Institute of Chile, Moscow Branch, Moscow 119992, Russia; olga@sai.msu.su ABSTRACT We have studied an unbarred Sb galaxy with a nuclear star-forming ring, NGC ... 1 7217, Pos. ... Left: Stellar velocity dispersion map for NGC 7217 according to the SAURON...
... Printed in U.S.A. ROSAT BLANK FIELD SOURCES. ... Here we designate as `` blank field sources '' or `` blanks '' all the bright ROSAT PSPC (Position Sensitive Proportional Counter) X-ray sources ( fX > 10ю13 ergs cmю2 sю1) with no optical counterpart on the Palomar Observatory Sky Survey (POSS) (to O ј 21:5)4 within their 3900 (99%) radius error circle. ... Lamer et al. find an X-ray flux at 1 keV of 2:06 б 10ю14 ergs cmю2 sю1 in a ROSAT observation during which the source falls in the PSPC outer rim...