J/A+A/582/A18 HI data cubes of 4 edge-on spiral galaxies (Allaert+, 2015)
HERschel Observations of Edge-on Spirals (HEROES).
II. Tilted-ring modelling of the atomic gas disks.
Allaert F., Gentile G., Baes M., De Geyter G., Hughes T.M., Lewis F.,
Bianchi S., De Looze I., Fritz J., Holwerda B.W., Verstappen J., Viaene S.
<Astron. Astrophys. 582, A18 (2015)>
=2015A&A...582A..18A 2015A&A...582A..18A (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Galaxies, radio ; Galaxies, rotation ;
H I data ; Interferometry ; Interstellar medium
Keywords: galaxies: ISM - galaxies: structure -
galaxies: kinematics and dynamics - galaxies: interactions
Abstract:
Edge-on galaxies can offer important insight into galaxy evolution
because they are the only systems where the distribution of the
different components can be studied both radially and vertically. The
HEROES project was designed to investigate the interplay between the
gas, dust, stars, and dark matter (DM) in a sample of 7 massive
edge-on spiral galaxies. In this second HEROES paper, we present an
analysis of the atomic gas content of 6 out of 7 galaxies in our
sample. The remaining galaxy was recently analysed according to the
same strategy. The primary aim of this work is to constrain the
surface density distribution, the rotation curve, and the geometry of
the gas disks in a homogeneous way. In addition we identify peculiar
features and signs of recent interactions. We have constructed
detailed tilted-ring models of the atomic gas disks based on new GMRT
21-cm observations of NGC 973 and UGC 4277 and re-reduced archival HI
data of NGC 5907, NGC 5529 IC 2531, and NGC 4217. Potential
degeneracies between different models were resolved by requiring good
agreement with the data in various representations of the data cubes.
From our modelling we find that all but one galaxy are warped along
the major axis. In addition, we identify warps along the line of sight
in three galaxies. A flaring gas layer is required to reproduce the
data for only one galaxy, but (moderate) flares cannot be ruled out
for the other galaxies either. A coplanar ring-like structure is
detected outside the main disk of NGC 4217, which we suggest could be
the remnant of a recent minor merger event. We also find evidence of a
radial inflow of 15 ±5km/s in the disk of NGC 5529, which might be
related to the ongoing interaction with two nearby companions. For NGC
5907 the extended, asymmetric, and strongly warped outer regions of
the HI disk also suggest a recent interaction.
In contrast, the inner disks of these three galaxies (NGC 4217,
NGC 5529, and NGC 5907) show regular behaviour and seem largely
unaffected by the interactions. Our models further support earlier
claims of prominent spiral arms in the disks of IC 2531 and NGC 5529.
Finally, we detect a dwarf companion galaxy at a projected distance of
36 kpc from the centre of NGC 973.
Description:
The reduced and Cleaned HI data cubes of the HEROES galaxies NGC 973,
UGC 4277, NGC 5529 and NGC 5907 are presented as FITS files. The
equatorial coordinates and the beam FWHM, velocity resolution and rms
noise of the data cubes are given in a separate table. NGC 973 and UGC
4277 were observed by the authors with the GMRT. The total time on
source was 5.7 and 6.2 hours, respectively. For NGC 5529, the data
were obtained by Kregel et al. (2004MNRAS.352..768K 2004MNRAS.352..768K) using the
Maxi-Short configuration of the WSRT, with a total time on source of
11.9 hours. Finally, NGC 5907 was observed by Shang et al.
(1998ApJ...504L..23S 1998ApJ...504L..23S) with the VLA in Modified C configuration. The
total time on source was 4.7 hours. The raw interferometric data can
be obtained from the online data archives of the telescopes in
question. For IC 2531 and NGC 4217, the reduced data were made
available to us by S. Peters (Peters et al., 2013arXiv1303.2463P 2013arXiv1303.2463P) and
M. Verheijen (Verheijen & Sancisi, 2001A&A...370..765V 2001A&A...370..765V), respectively.
We refer the user to the original papers for further questions or
requests about the data.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
cubes.dat 126 4 Properties of the presented data cubes
cubes/* . 4 FITS HI data cubes of four HEROES galaxies
--------------------------------------------------------------------------------
Byte-by-byte Description of file: cubes.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name Galaxy name
10- 11 I2 h RAh Right ascension (J2000.0) (NED)
13- 14 I2 min RAm Right ascension (J2000.0) (NED)
16- 20 F5.2 s RAs Right ascension (J2000.0) (NED)
22 A1 --- DE- Declination sign (J2000.0)
23- 24 I2 deg DEd Declination (J2000.0) (NED)
26- 27 I2 arcmin DEm Declination (J2000.0) (NED)
29- 32 F4.1 arcsec DEs Declination (J2000.0) (NED)
34- 37 F4.1 arcsec Bmaj Beam major axis FWHM
39- 42 F4.1 arcsec Bmin Beam minor axis FWHM
44- 47 F4.1 km/s dHVel Velocity resolution
49- 51 F3.1 mJy rms rms noise level (mJy/beam) (1)
53- 56 F4.2 arcsec/pix Scale Scale of the image
58- 60 I3 --- Nx Number of pixel along X-axis
62- 64 I3 --- Ny Number of pixel along Y-axis
66- 68 I3 --- Nz Number of slices
70- 90 A21 --- Date Observation date (YYYY-MM-DDThh:mm:ss.s)
92- 99 F8.3 km/s bHVel Lower value of heliocentric velocity
101-108 F8.3 km/s BHVel Upper value of heliocentric velocity
110-114 I5 Kibyte size Size of the fits file
116-126 A11 --- FileName Name of the fits file in subdirectory cubes
--------------------------------------------------------------------------------
Note (1): Conversion to SI units:
1 mJy/beam = (1e-29)/(1.133*bmaj*bmin) W/(m2*Hz*arcsec2)
with bmaj, bmin in arcsec
--------------------------------------------------------------------------------
Acknowledgements:
Flor Allaert, Flor.Allaert(at)UGent.be
Refeences:
Verstappen et al., Paper I 2013A&A...556A..54V 2013A&A...556A..54V
(End) Flor Allaert [Universiteit Gent], Patricia Vannier [CDS] 08-Sep-2015