J/ApJ/885/160 Best-fit emission-line properties in NGC 5775 (Boettcher+, 2019)
A dynamical study of extraplanar diffuse ionized gas in NGC 5775.
Boettcher E., Gallagher J.S., Zweibel E.G.
<Astrophys. J., 885, 160 (2019)>
=2019ApJ...885..160B 2019ApJ...885..160B
ADC_Keywords: Galaxies; Spectra, ultraviolet; Spectra, optical;
Radial velocities
Keywords: galaxies: individual (NGC 5775) ; galaxies: ISM ;
ISM: kinematics and dynamics
Abstract:
The structure and kinematics of gaseous, disk-halo interfaces are
imprinted with the processes that transfer mass, metals, and energy
between galactic disks and their environments. We study the
extraplanar diffuse ionized gas (eDIG) layer in the interacting,
star-forming galaxy NGC5775 to better understand the consequences of
star formation feedback on the dynamical state of the thick-disk
interstellar medium. Combining emission-line spectroscopy from the
Robert Stobie Spectrograph on the Southern African Large Telescope
with radio continuum observations from Continuum Halos in Nearby
Galaxies-an EVLA Survey, we ask whether thermal, turbulent, magnetic
field, and cosmic-ray pressure gradients can stably support the eDIG
layer in dynamical equilibrium. This model fails to reproduce the
observed exponential electron scale heights of the eDIG thick disk and
halo on the northeast (hz,e=0.6,7.5kpc) and southwest
(hz,e=0.8,3.6kpc) sides of the galaxy at R<11kpc. We report the
first definitive detection of an increasing eDIG velocity dispersion
as a function of height above the disk. Blueshifted gas along the
minor axis at large distances from the midplane hints at a disk-halo
circulation and/or ram pressure effects caused by the ongoing
interaction with NGC5774. This work motivates further integral field
unit and/or Fabry-Perot spectroscopy of galaxies with a range of star
formation rates to develop a spatially resolved understanding of the
role of star formation feedback in shaping the kinematics of the
disk-halo interface.
Description:
We used the optical and NUV capabilities of Robert Stobie Spectrograph
(RSS) in longslit mode on Southern African Large Telescope (SALT). We
used a 1.25" width for the 8' longslits and the pg2300 grating at an
angle of 48.875°. This produced a dispersion of 0.26Å/pixel, a
spectral resolution of R=4830 (σ=26km/s) at Hα, and
wavelength coverage from 6100Å to 6900Å. We obtained these data
between 2017 February 23 and 2017 March 4.
Objects:
----------------------------------------------
RA (2000) DE Designation(s)
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14 53 57.65 +03 32 40.1 NGC 5775 = NGC 5775
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 110 38 Best-fit emission-line properties: s1
table5.dat 72 64 Best-fit emission-line properties: s2
table6.dat 45 31 Best-fit emission-line properties: s3uv
table7.dat 62 39 Best-fit emission-line properties: s3o
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See also:
J/MNRAS/390/59 : X-ray sources in NGC 5775 (Li+, 2008)
J/AJ/150/81 : CHANG-ES. IV. VLA D-configuration observations (Wiegert+,2015)
J/ApJ/832/118 : Emission-line spectroscopy in NGC 891 (Boettcher+, 2016)
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 F4.1 kpc z Distance from midplane
6- 10 F5.1 10-17mW/m2/arcsec2 I-Ha ?=0.0 H-alpha intensity,
10-17erg/cm2/s/arcsec-2 (1)
12- 14 F3.1 10-17mW/m2/arcsec2 e_I-Ha ?=0.0 Uncertainty in I-Ha
16- 19 I4 km/s RV-Ha ?=0 H-alpha heliocentric radial
velocity (1)
21- 23 F3.1 km/s e_RV-Ha ?=0.0 Uncertainty in RV-Ha
25- 26 I2 km/s dV-Ha ?=0 H-alpha line width (2)
28- 30 F3.1 km/s e_dV-Ha ?=0.0 Uncertainty in dV-Ha
32- 35 F4.2 --- OI63/Ha ?=0.00 [OI]6300/H-alpha line ratio
(1)
37- 41 F5.3 --- e_OI63/Ha ?=0.000 Uncertainty in OI63/Ha
43- 46 I4 km/s RV-OI63 ?=0 [OI]6300 heliocentric radial
velocity (1)
48- 48 I1 km/s e_RV-OI63 ?=0 Uncertainty in RV-OI63
50- 51 I2 km/s dV-OI63 ?=0 [OI]6300 line width (2)
53- 53 I1 km/s e_dV-OI63 ?=0 Uncertainty in dV-OI63
55- 58 F4.2 --- NII65/Ha ?=0.00 [NII]6583/H-alpha line
ratio (1)
60- 64 F5.3 --- e_NII65/Ha ?=0.000 Uncertainty in NII65-Ha
66- 69 I4 km/s RV-NII65 ?=0 [NII]6583 heliocentric radial
velocity (1)
71- 73 F3.1 km/s e_RV-NII65 ?=0.0 Uncertainty in RV-NII65
75- 76 I2 km/s dV-NII65 ?=0 [NII]6583 line width (2)
78- 80 F3.1 km/s e_dV-NII65 ?=0.0 Uncertainty in dV-NII65
82- 85 F4.2 --- SII67/Ha ?=0.00 [SII]6717/H-alpha line ratio
(1)
87- 91 F5.3 --- e_SII67/Ha ?=0.000 Uncertainty in SII67/Ha
93- 96 I4 km/s RV-SII67 ?=0 [SII]6717 heliocentric radial
velocity (1)
98-101 F4.1 km/s e_RV-SII67 ?=0.0 Uncertainty in RV-SII67
103-105 I3 km/s dV-SII67 ?=0 [SII]6717 line width (2)
107-110 F4.1 km/s e_dV-SII67 ?=0.0 Uncertainty in dV-SII67
--------------------------------------------------------------------------------
Note (1): Emission lines with less than five-sigma detections have null entries.
Note (2): All line widths are standard deviations (not FWHM) and are
corrected for the instrumental resolution.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 F5.1 kpc R Distance from minor axis
7- 9 F3.1 10-17mW/m2/arcsec2 I-Ha ?=0.0 H-alpha intensity,
10-17erg/cm2/s/arcsec2 (1)
11- 13 F3.1 10-17mW/m2/arcsec2 e_I-Ha ?=0.0 Uncertainty in I-Ha
15- 18 I4 km/s RV-Ha ?=0 H-alpha heliocentric radial
velocity (1)
20- 20 I1 km/s e_RV-Ha ?=0 Uncertainty in RV-Ha
22- 24 I3 km/s dV-Ha ?=0 H-alpha line width (2)
26- 26 I1 km/s e_dV-Ha ?=0 Uncertainty in dV-Ha
28- 31 F4.2 --- NII65/Ha ?=0.00 [NII]6583/H-alpha line
ratio (1)
33- 36 F4.2 --- e_NII65/Ha ?=0.00 Uncertainty in NII65/Ha
38- 41 I4 km/s RV-NII65 ?=0 [NII]6583 heliocentric radial
velocity (1)
43- 43 I1 km/s e_RV-NII65 ?=0 Uncertainty in RV-NII65
45- 46 I2 km/s dV-NII65 ?=0 [NII]6583 line width (2)
48- 48 I1 km/s e_dV-NII65 ?=0 Uncertainty in dV-NII65
50- 53 F4.2 --- SII67/Ha ?=0.00 [SII]6717/H-alpha line ratio
(1)
55- 58 F4.2 --- e_SII67/Ha ?=0.00 Uncertainty in SII67-Ha
60- 63 I4 km/s RV-SII67 ?=0 [SII]6717 heliocentric radial
velocity (1)
65- 66 I2 km/s e_RV-SII67 ?=0 Uncertainty in RV-SII67
68- 69 I2 km/s dV-SII67 ?=0 [SII]6717 line width (2)
71- 72 I2 km/s e_dV-SII67 ?=0 Uncertainty in dV-SII67
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Note (1): Emission lines with less than five-sigma detections have null entries.
Note (2): All line widths are standard deviations (not FWHM) and are
corrected for the instrumental resolution.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 F4.1 kpc z Distance from midplane
6- 8 I3 ct I-OII OII3727 intensity, SALT ADU
10- 11 I2 ct e_I-OII Uncertainty in I-OII
13- 15 F3.1 --- OIIrat OII3729/[OII]3726 line ratio
17- 20 F4.2 --- E_OIIrat Upper uncertainty in OIIrat
22- 25 F4.2 --- e_OIIrat Lower uncertainty in OIIrat
27- 30 I4 km/s RV-OII OII3727 heliocentric radial velocity
32- 33 I2 km/s E_RV-OII Upper uncertainty in RV-OII
35- 36 I2 km/s e_RV-OII Lower uncertainty in RV-OII
38- 39 I2 km/s dV-OII OII3727 line width (1)
41- 42 I2 km/s E_dV-OII Upper uncertainty in dV-OII
44- 45 I2 km/s e_dV-OII Lower uncertainty in dV-OII
--------------------------------------------------------------------------------
Note (1): All line widths are standard deviations (not FWHM) and are
corrected for the instrumental resolution.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 F4.1 kpc z Distance from midplane
6- 9 I4 ct I-Ha H-alpha intensity, SALT ADU
11- 12 I2 ct e_I-Ha Uncertainty in I-Ha
14- 17 I4 km/s HRV-Ha H-alpha heliocentric radial velocity
19- 22 F4.1 km/s e_HRV-Ha Uncertainty in HRV-Ha
24- 27 F4.2 --- OII37/Ha ?=0.00 [OII]3727/H-alpha line ratio
29- 32 F4.2 --- e_OII37/Ha ?=0.00 Uncertainty OII37/Ha
34- 37 F4.2 --- OIII50/Ha ?=0.00 [OIII]5007/H-alpha line ratio (1)
39- 42 F4.2 --- e_OIII50/Ha ?=0.00 Uncertainty in OIII50/Ha
44- 47 F4.2 --- OI63/Ha ?=0.00 [OI]6300/H-alpha line ratio (1)
49- 52 F4.2 --- e_OI63/Ha ?=0.00 Uncertainty in OI63/Ha
54- 57 F4.2 --- NII65/Ha ?=0.00 [NII]6583/H-alpha line ratio (1)
59- 62 F4.2 --- e_NII65/Ha ?=0.00 Uncertainty in NII65/Ha
--------------------------------------------------------------------------------
Note (1): Emission lines with less than five-sigma detections have null entries.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 16-Sep-2021