J/A+A/690/A66 The host of GRB 171205A (Thoene+, 2024)
The host of GRB 171205A in 3D.
A resolved multiwavelength study of a rare grand-design spiral GRB host.
Thoene C.C., de Ugarte Postigo A., Izzo L., Michalowski M.J., Levan A.J.,
Leung J.K., Agui Fernandez J.F., Geron T., Friesen R., Christensen L.,
Covino S., D Elia V., Hartmann D.H., Jakobsson P., De Pasquale M.,
Pugliese G., Rossi A., Schady P., Wiersema K., Zafar T.
<Astron. Astrophys. 690, A66 (2024)>
=2024A&A...690A..66T 2024A&A...690A..66T (SIMBAD/NED BibCode)
ADC_Keywords: GRB ; H I data
Keywords: galaxies: ISM - galaxies: kinematics and dynamics - galaxies: spiral -
gamma-ray burst: individual: GRB 171205A
Abstract:
Long GRB hosts at z<1 are usually low-mass, low-metallicity
star-forming galaxies. Here we present the most detailed, spatially
resolved study of the host of GRB 171205A so far, a grand-design
barred spiral galaxy at z=0.036. Our analysis includes MUSE integral
field spectroscopy complemented with high-spatial-resolution UV/VIS
HST imaging and CO(1-0) and HI 21cm data. The GRB is located in a
small star-forming region in a spiral arm of the galaxy at a
deprojected distance of about 8 kpc from the center. The galaxy shows
a smooth negative metallicity gradient and the metallicity at the GRB
site is half solar, slightly below the mean metallicity at the
corresponding distance from the center. Star formation in this galaxy
is concentrated in a few HII regions between 5 and 7kpc from the
center and at the end of the bar, inwards from the GRB region; however
the HII region hosting the GRB is in the top 10% of the regions with
the highest specific star-formation rate. The stellar population at
the GRB site has a very young component (<5Myr) that contributes a
significant part of the light. Ionized and molecular gas show only
minor deviations at the end of the bar. A parallel study found an
asymmetric HI distribution and some additional gas near the position
of the GRB, which might explain the star-forming region of the GRB
site. Our study shows that long GRBs can occur in many types of
star-forming galaxies; however the actual GRB sites have consistently
low metallicity, high star formation rates, and a young population.
Furthermore, gas inflow or interactions triggering the star formation
producing the GRB progenitor might not be evident in ionized or even
molecular gas but only in HI.
Description:
Moment 0 (flux) and moment 1 (velocity) maps of the HI data observed
with the JVLA telescope. Maps are displayed for both the host galaxy
of GRB 171205A and the companion galaxy at a distance of 184kpc. Both
maps have a FOV of around 4.2x4.2 arcminutes around the corresponding
galaxy.
Objects:
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RA (2000) DE Designation(s)
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11 09 39.67 -12 35 11.5 GRB 171205A host galaxy = LEDA 950703
11 09 26.86 -12 32 20.2 Companion galaxy at same redshift
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 123 4 List of fits maps
fits/* . 4 Individual fits maps
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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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- 48 A21 "datime" Obs.date Observation date
50- 56 F7.5 GHz Freq Observed frequency
58- 60 I3 Kibyte size Size of FITS file
62- 91 A30 --- FileName Name of FITS file, in subdirectory fits
93-123 A31 --- Title Title of the FITS file (1)
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Note (1): Moment 0 (flux) and moment 1 (velocity) maps of HI gas of the host
galaxy and its companion obtained from JVLA.
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Acknowledgements:
Christina Thoene, christina.thoene(at)gmail.com
The data were reduced by J. Leung, T. Geron and R. Friesen.
References:
Arabsalmani et al., 2022AJ....164...69A 2022AJ....164...69A
(End) Patricia Vannier [CDS] 17-Jul-2024