Other
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21641910s&link_type=abstract
American Astronomical Society, AAS Meeting #216, #419.10
Other
Scientific paper
Studies of kinematics of planetary nebulae (PN) in all kinds of galaxies can provide information about very low-surface-brightness stellar populations that would be very hard to study using their integrated continuous spectrum. For example, PN kinematics in M82, an almost-edge-on spiral galaxy with a strong starburst, indicate a rotating stellar halo (Johnson et al. 2009, ApJ 697, 1138), which might be attributable to a past interaction with M81. The interesting case of M82 prompted us to perform similar analysis on other, more normal edge-on galaxies. We present the discovery, narrow-band photometry and kinematic analysis of planetary nebulae (PNs) in NGC 891, an edge-on spiral galaxy sometimes called the "Milky Way twin", using a slitless radial velocity technique with the 8.2m telescope Subaru + FOCAS. We detected 132 PNs in our images, 99 of which are new additions to the 33 discovered by Ciardullo et al. (1991, ApJ 383, 487). With our larger sample, we derived a distance modulus to NGC 891 using the planetary nebulae luminosity function (PNLF) and found good agreement with the value obtained earlier by Ciardullo et al. (1991). This confirms that NGC 891 is one of the few cases with PNLF distance larger than the surface brightness fluctuation (SBF) distance measured by Tonry et al. (2001, ApJ 546, 681). We present an estimate of the scale height of the PN population. The radial velocity of each PN was calculated using a grism image. We have kinematic information extending out to about 3 kpc from the galactic plane. We found 62 PN that are more than 1 kpc away from the galactic plane, and we present a first study of the motions in the halo of this galaxy.
Mendez Roberto H.
Shih Hsin-Yi
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