2015ApJ...799...61Z


Query : 2015ApJ...799...61Z

2015ApJ...799...61Z - Astrophys. J., 799, 61 (2015/January-3)

Investigating disk-halo flows and accretion: a kinematic and morphological analysis of extraplanar H I in NGC 3044 and NGC 4302.

ZSCHAECHNER L.K., RAND R.J. and WALTERBOS R.

Abstract (from CDS):

To further understand the origins of and physical processes operating in extra-planar gas, we present observations and kinematic models of H I in the two nearby, edge-on spiral galaxies NGC 3044 and NGC 4302. We model NGC 3044 as a single, thick disk. Substantial amounts of extra-planar H I are also detected. We detect a decrease in rotation speed with height (a lag) that shallows radially, reaching zero at approximately R25. The large-scale kinematic asymmetry of the approaching and receding halves suggests a recent disturbance. The kinematics and morphology of NGC 4302, a Virgo Cluster member, are greatly disturbed. We model NGC 4302 as a combination of a thin disk and a second, thicker disk, the latter having a hole near the center. We detect lagging extra-planar gas, with indications of shallowing in the receding half, although its characteristics are difficult to constrain. A bridge is detected between NGC 4302 and its companion, NGC 4298. We explore trends involving the extra-planar H I kinematics of these galaxies, as well as galaxies throughout the literature, as well as possible connections between lag properties with star formation and environment. Measured lags are found to be significantly steeper than those modeled by purely ballistic effects, indicating additional factors. Radial shallowing of extra-planar lags is typical and occurs between 0.5R25 and R25, suggesting internal processes are important in dictating extra-planar kinematics.

Abstract Copyright:

Journal keyword(s): galaxies: individual: (NGC 3044, NGC 4302) - galaxies: halos - galaxies: kinematics and dynamics - galaxies: spiral - galaxies: structure

Simbad objects: 13

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Number of rows : 13
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 UGC 2082 GiG 02 36 16.152 +25 25 25.75   14.00       ~ 104 0
4 NGC 3044 G 09 53 40.884 +01 34 46.74   12.7   12.7 12.3 ~ 205 1
5 NGC 4244 GiG 12 17 29.659 +37 48 25.60   10.71   9.99   ~ 522 1
6 UGC 7321 EmG 12 17 34.021 +22 32 23.35   14.07   13.21   ~ 236 0
7 NGC 4298 GiP 12 21 32.7577915037 +14 36 22.056303797   12.04 11.34     ~ 290 1
8 NGC 4302 GiP 12 21 42.477 +14 35 51.94   13.4 11.61     ~ 299 0
9 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6084 0
10 NGC 4565 LIN 12 36 20.804 +25 59 14.61   13.61 12.43     ~ 898 0
11 NGC 5023 EmG 13 12 11.799 +44 02 16.88   13.2       ~ 228 0
12 NGC 5746 GiP 14 44 56.005 +01 57 17.06   12.3       ~ 332 0
13 NGC 5775 GiP 14 53 57.653 +03 32 40.10   13.0 11.34     ~ 407 2

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2021.09.17-17:39:56

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