J/A+A/623/A154 CO datacube and spectra of UGC 10214 (Rosado-Belza+, 2019)
Star formation and gas in the minor merger UGC 10214.
Rosado-Belza D., Lisenfeld U., Hibbard J., Kniermann K., Ott J., Verley S.,
Boquien M., Jarrett T., Xu C.K.
<Astron. Astrophys. 623, A154 (2019)>
=2019A&A...623A.154R 2019A&A...623A.154R (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; Spectra, millimetric/submm ;
Interstellar medium
Keywords: galaxies: interactions - ISM: molecules - galaxies: evolution -
galaxies: ISM - galaxies: star formation -
galaxies: (individual) UGC 10241
Abstract:
Minor mergers play a crucial role in galaxy evolution. UGC 10214 (the
Tadpole galaxy) is a prime example of this process in which a dwarf
galaxy has interacted with a large spiral galaxy ∼250 Myr ago and
produced a perturbed disc and a giant tidal tail. We used a
multi-wavelength dataset that partly consists of new observations
(Hα, HI, and CO) and partly of archival data to study the
present and past star formation rate (SFR) and its relation to the gas
and stellar mass at a spatial resolution down to 4 kpc. UGC 10214 is a
high-mass (stellar mass M*=1.28x1011 M☉) galaxy with a low
gas fraction (Mgas/M*=0.24), a high molecular gas fraction
(MH2/MHI=0.4), and a modest SFR (2-5 M☉/yr). The global SFR
compared to its stellar mass places UGC 10214 on the galaxy main
sequence (MS). The comparison of the molecular gas mass and current
SFR gives a molecular gas depletion time of about ∼2 Gyr (based on
Hα), comparable to those of normal spiral galaxies. Both from a
comparison of the Hα emission, tracing the current SFR, and
far-ultraviolet (FUV) emission, tracing the recent SFR during the past
tens of Myr, and also from spectral energy distribution fitting with
CIGALE, we find that the SFR has increased by a factor of about 2-3
during the recent past. This increase is particularly noticeable in
the centre of the galaxy where a pronounced peak of the Hα emission
is visible. A pixel-to-pixel comparison of the SFR, molecular gas
mass, and stellar mass shows that the central region has had a
depressed FUV-traced SFR compared to the molecular gas and the stellar
mass, whereas the Hα-traced SFR shows a normal level. The atomic
and molecular gas distribution is asymmetric, but the position-velocity
diagram along the major axis shows a pattern of regular rotation. We
conclude that the minor merger has most likely caused variations in
the SFR in the past that resulted in a moderate increase of the SFR,
but it has not perturbed the gas significantly so that the molecular
depletion time remains normal.
Description:
FITS data-cube of CARMA CO(1-0), and the two fits files that contain
the IRAM 30m spectra of CO(10) and CO(2-1). There are 8 spectra in
each file.
Objects:
------------------------------------------------------------
RA (2000) DE Designation(s)
------------------------------------------------------------
16 06 03.94 +55 25 31.3 UGC 10214 = NAME Tadpole Galaxy
------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
spco10.dat 47 8 List of CO(1-0) spectra of the disk of UGC 10214
spco21.dat 47 8 List of CO(2-1) spectra of the disk of UGC 10214
list.dat 175 3 List of fits files
fits/* . 3 Individual fits files
--------------------------------------------------------------------------------
See also:
J/ApJ/612/202 : Catalog of spheroids in UGC 10214 field (Menanteau+, 2004)
Byte-by-byte Description of file: spco10.dat spco21.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 I4 --- Scan Scan number
6- 12 A7 --- Object Object
14- 20 F7.3 deg RAdeg Right ascension (J2000)
22- 28 F7.4 deg DEdeg Declination (J2000)
30- 36 F7.3 GHz Freq Observed frequency
38- 47 A10 "date" Obs.Date Observation date
--------------------------------------------------------------------------------
Byte-by-byte Description of file: list.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.5 deg RAdeg Right Ascension of center (J2000)
10- 18 F9.5 deg DEdeg Declination of center (J2000)
20- 22 I3 --- Nx Number of pixels along X-axis
24- 26 I3 --- Ny Number of pixels along Y-axis
28- 29 I2 --- Nz ? Number of slices, for the datacube
31- 51 A21 "datime" Obs.Date Observation date (YYYY-MM-DDThh:mm:ss.s)
53- 59 F7.2 km/s bVLSR ? Lower value of Vlsr interval
for the datacube
61- 67 F7.2 km/s BVLSR ? Upper value of Vlsr interval
for the datacube
69- 75 F7.3 km/s dVLSR ? Vlsr resolution for the datacube
77- 88 E12.6 Hz bFreq ? Lower value of relative frequency interval
for the specra
90-100 E11.6 Hz BFreq ? Upper value of relative frequency interval
for the specra
102-112 E11.6 Hz dFreq ? Frequency resolution for the specra
113-116 I4 Kibyte size Size of FITS file
118-147 A30 --- FileName Name of FITS file, in subdirectory fits
149-175 A27 --- Title Title of the FITS file
--------------------------------------------------------------------------------
Acknowledgements:
David Rosado-Belza, drb(at)iac.es
(End) Patricia Vannier [CDS] 12-Dec-2018