J/A+A/655/A84 AFGL 2591-VLA 3 IRAM/NOEMA datacubes (Suri+, 2021)
Disk fragmentation in high-mass star formation.
High-resolution observations towards AFGL 2591-VLA 3.
Suri S., Beuther H., Gieser C., Ahmadi A., Sanchez-Monge A., Winters J.M.,
Linz H., Henning T., Beltran M.T., Bosco F., Cesaroni R., Csengeri T.,
Feng S., Hoare M.G., Johnston K.G., Klaasen P., Kuiper R., Leurini S.,
Longmore S., Lumsden S., Maud L., Moscadelli L., Moeller T., Palau A.,
Peters T., Pudritz R.E., Ragan S.E., Semenov D., Schilke P., Urquhart J.S.,
Wyrowski F., Zinnecker H.
<Astron. Astrophys. 655, A84 (2021)>
=2021A&A...655A..84S 2021A&A...655A..84S (SIMBAD/NED BibCode)
ADC_Keywords: YSOs ; Interferometry
Keywords: stars: formation - stars: massive - techniques: interferometric
Abstract:
Increasing evidence suggests that, similar to their low-mass
counterparts, high-mass stars form through a disk-mediated accretion
process. At the same time, formation of high-mass stars still
necessitates high accretion rates, and hence, high gas densities,
which in turn can cause disks to become unstable against gravitational
fragmentation.
We study the kinematics and fragmentation of the disk around the
high-mass star forming region AFGL 2591-VLA 3 which was hypothesized
to be fragmenting based on the observations that show multiple outflow
directions.
We use a new set of high-resolution (0.19-arcsec) IRAM/NOEMA
observations at 843 micron towards VLA 3 which allow us to resolve its
disk, characterize the fragmentation, and study its kinematics. In
addition to the 843 micron continuum emission, our spectral setup
targets warm dense gas and outflow tracers such as HCN, HC3N and
SO2, as well as vibrationally excited HCN lines.
The high resolution continuum and line emission maps reveal multiple
fragments with subsolar masses within the inner 1000AU of VLA 3.
Furthermore, the velocity field of the inner disk observed at 843
micron shows a similar behavior to that of the larger scale velocity
field studied in the CORE project at 1.37mm.
We present the first observational evidence for disk fragmentation
towards AFGL 2591-VLA 3, a source that was thought to be a single
high-mass core. While the fragments themselves are low-mass, the
rotation of the disk is dominated by the protostar with a mass of
10.3±1.8M☉. These data also show that NOEMA Band 4 can obtain
the highest currently achievable spatial resolution at (sub-)mm
wavelengths in observations of strong northern sources.
Description:
NOEMA Band 4 observations carried out at 843 micron towards AFGL
2591-VLA 3. The 843 micron continuum emission map along with the line
emission datacubes (HCN, HC3N, SO2, as well as the vibrationally
excited HCN) presented in the paper are included in FITS format.
Observations were carried out using the IRAM
NOEMA interferometer in February 2018.
Objects:
------------------------------------------------------------------------
RA (2000) DE Designation(s)
------------------------------------------------------------------------
20 29 24.88 +40 11 19.5 AFGL 2591 VLA 3 = [TCC2003] AFGL 2591 VLA 3
------------------------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
list.dat 160 6 List of fits image and datacubes
fits/* . 6 Individual fits files
--------------------------------------------------------------------------------
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- 23 I4 --- Nx Number of pixels along X-axis
25- 28 I4 --- Ny Number of pixels along Y-axis
30- 31 I2 --- Nz ? Number of slices
33- 38 I6 m/s bVRAD ? Lower value of VRAD interval for
the datacubes
40- 44 I5 m/s BVRAD ? Upper value of VRAD interval for
the datacubes
46- 49 I4 m/s dVRAD ? VRAD resolution
51- 56 I6 Kibyte size Size of FITS file
58-109 A52 --- FileName Name of FITS file, in subdirectory fits
111-160 A50 --- Title Title of the FITS file
--------------------------------------------------------------------------------
Acknowledgements:
Suemeyye Suri, suemeyye.suri(at)univie.ac.at
(End) Patricia Vannier [CDS] 13-Sep-2021