Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21724623z&link_type=abstract
American Astronomical Society, AAS Meeting #217, #246.23; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
We present models of the distribution and kinematics of HI in NGC 4244 and NGC 4565, two nearby spiral galaxies observed as part of the Westerbork Hydrogen Accretion in LOcal GAlaxieS (HALOGAS) survey. These models focus on the potential existence of extraplanar gas in the form of a halo as well as the presence of a negative gradient in rotational velocity upward from the plane of the disk (a lag). Insight concerning such information may help to better understand the prevalence as well as origins of halos in spiral galaxies, specifically whether they are a result of outflow from the disk, accretion from external sources, or a combination of the two. Models of NGC 4244 yield strong evidence against the presence of a halo and instead favor a warp along the line of sight as an explanation for the observed thickening of the disk. We do detect a lag which decreases in magnitude radially outward from the center of the disk such that the lag in the outermost parts of the disk is substantially shallower than that near the center. These models are based on deeper observations as well as improved modeling techniques and thus differ somewhat from past models of NGC 4244. Previous efforts to model NGC 4565 from data taken prior to the HALOGAS survey indicate a flare as well as a potential lag. We will refine these models using our deeper observations.
Gentile Gianfranco
HALOGAS Team
Heald George H.
Rand Richard J.
Zschaechner Laura
No associations
LandOfFree
The HALOGAS Project: HI Observations Of NGC 4244 And NGC 4565 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The HALOGAS Project: HI Observations Of NGC 4244 And NGC 4565, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The HALOGAS Project: HI Observations Of NGC 4244 And NGC 4565 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1399210