ar X iv : 0 70 8 . 28 52 v 1 [ as tr o - ph ] 2 1 A ug 2 00 7 Modeling Non - Circular Motions in Disk Galaxies : A Bar in NGC 2976

ar X iv : 0 70 8 . 38 56 v 1 [ as tr o - ph ] 2 8 A ug 2 00 7 Young Star Clusters in M 31

In our study of M31’s globular cluster system with MMT/Hectospec, we have obtained high-quality spectra of 85 clusters with ages less than 1 Gyr. With the exception of Hubble V, the young cluster in NGC 205, we find that these young clusters have kinematics and spatial distribution consistent with membership in M31’s young disk. Preliminary estimates of the cluster masses and structural paramet...

ar X iv : 0 70 8 . 26 18 v 1 [ as tr o - ph ] 2 0 A ug 2 00 7 Using Local Volume data to constrain Dark Matter dynamics

ar X iv : 0 71 0 . 18 63 v 1 [ as tr o - ph ] 9 O ct 2 00 7 The Detection of Molecular Gas in the Outskirts of NGC 6946

We present the results of a search for molecular gas emission via the CO line in the far outer disk of the nearby spiral, NGC 6946. The positions targeted were chosen to lie on or near previously-identified outer disk HII regions. Molecular gas was clearly detected out to 1.3 R25, with a further tentative detection at 1.4 R25. The CO detections show excellent agreement with the HI velocities an...

ar X iv : 0 70 5 . 40 34 v 1 [ as tr o - ph ] 2 8 M ay 2 00 7 The cold gaseous halo of NGC 891

We present H I observations of the edge-on galaxy NGC 891. These are among the deepest ever performed on an external galaxy. They reveal a huge gaseous halo, much more extended than seen previously and containing almost 30% of the H I. This H I halo shows structures on various scales. On one side, there is a filament extending (in projection) up to 22 kpc vertically from the disk. Small (MHI ∼ ...

Modeling Non - Circular Motions in Disk Galaxies : Application to Ngc 2976

We present a new procedure to fit non-axisymmetric flow patterns to 2-D velocity maps of spiral galaxies. We concentrate on flows caused by bar-like or oval distortions to the total potential that may arise either from a non-axially symmetric halo or a bar in the luminous disk. We apply our method to high-quality CO and Hα data for the nearby, low-mass spiral NGC 2976 previously obtained by Sim...