2011ApJ...740...35Z


Query : 2011ApJ...740...35Z

2011ApJ...740...35Z - Astrophys. J., 740, 35 (2011/October-2)

HALOGAS: H I observations and modeling of the nearby edge-on spiral galaxy NGC 4244.

ZSCHAECHNER L.K., RAND R.J., HEALD G.H., GENTILE G. and KAMPHUIS P.

Abstract (from CDS):

We present 21 cm observations and models of the H I kinematics and distribution of NGC 4244, a nearby edge-on Scd galaxy observed as part of the Westerbork HALOGAS (Hydrogen Accretion in LOcal GAlaxieS) survey. Our models give insight into the H I kinematics and distribution with an emphasis on the potential existence of extraplanar gas as well as a negative gradient in rotational velocity with height above the plane of the disk (a lag). Our models yield strong evidence against a significantly extended halo and instead favor a warp component along the line of sight as an explanation for most of the observed thickening of the disk. Based on these models, we detect a lag of -9+3_- 2_ km/s/kpc in the approaching half and -9±2 km/s/kpc in the receding half. This lag decreases in magnitude to -5±2 km/s/kpc and -4±2 km/s/KPC near a radius of 10 kpc in the approaching and receding halves, respectively. Additionally, we detect several distinct morphological and kinematic features including a shell that is probably driven by star formation within the disk.

Abstract Copyright:

Journal keyword(s): galaxies: halos - galaxies: individual: NGC 4244 - galaxies: ISM - galaxies: kinematics and dynamics - galaxies: spiral - galaxies: structure

Simbad objects: 9

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Number of rows : 9
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 UGC 1281 LSB 01 49 31.71 +32 35 16.2   13.0       ~ 146 0
2 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1567 2
3 NGC 2403 AGN 07 36 51.396 +65 36 09.17 9.31 8.84 8.38 8.19   ~ 1654 1
4 NGC 4244 GiG 12 17 29.659 +37 48 25.60   10.71   9.99   ~ 522 1
5 UGC 7321 EmG 12 17 34.021 +22 32 23.35   14.07   13.21   ~ 236 0
6 NGC 4302 GiP 12 21 42.477 +14 35 51.94   13.4 11.61     ~ 299 0
7 NGC 4559 H2G 12 35 57.6399424116 +27 57 35.859639262   10.46 10.01     ~ 557 1
8 NGC 5746 GiP 14 44 56.005 +01 57 17.06   12.3       ~ 332 0
9 NGC 5775 GiP 14 53 57.653 +03 32 40.10   13.0 11.34     ~ 407 2

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2021.09.27-18:16:02

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