H Intensity Map of the Repeating Fast Radio Burst FRB 121102 Host Galaxy from Subaru/Kyoto 3DII AO-assisted Optical Integral-field Spectroscopy Based on data collected at Subaru Telescope, which is operated by the National Astronomical Observatory of Japan

We present the H intensity map of the host galaxy of the repeating fast radio burst FRB 121102 at a redshift of z = 0.193 obtained with the AO-assisted Kyoto 3DII optical integral-field unit mounted on the 8.2 m Subaru Telescope. We detected a compact H -emitting (i.e., star-forming) region in the g...

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Bibliographic Details
Published in:The Astrophysical journal 2017-07, Vol.844 (2)
Main Authors: Kokubo, Mitsuru, Mitsuda, Kazuma, Sugai, Hajime, Ozaki, Shinobu, Minowa, Yosuke, Hattori, Takashi, Hayano, Yutaka, Matsubayashi, Kazuya, Shimono, Atsushi, Sako, Shigeyuki, Doi, Mamoru
Format: Article
Language:English
Subjects:
galaxies: ISM
instrumentation: adaptive optics
intergalactic medium
stars: magnetars
stars: neutron
techniques: imaging spectroscopy
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Summary:We present the H intensity map of the host galaxy of the repeating fast radio burst FRB 121102 at a redshift of z = 0.193 obtained with the AO-assisted Kyoto 3DII optical integral-field unit mounted on the 8.2 m Subaru Telescope. We detected a compact H -emitting (i.e., star-forming) region in the galaxy, which has a much smaller angular size ( (1.9 kpc) at full width at half maximum (FWHM)) than the extended stellar continuum emission region determined by the Gemini/GMOS -band image ( (4.6 kpc) at FWHM with ellipticity ). The spatial offset between the centroid of the H emission region and the position of the radio bursts is (0.26 0.07 kpc), indicating that FRB 121102 is located within the star-forming region. This close spatial association of FRB 121102 with the star-forming region is consistent with expectations from young pulsar/magnetar models for FRB 121102, and it also suggests that the observed H emission region can make a major dispersion measure (DM) contribution to the host galaxy DM component of FRB 121102. Nevertheless, the largest possible value of the DM contribution from the H emission region inferred from our observations still requires a significant amount of ionized baryons in intergalactic medium (IGM; the so-called "missing" baryons) as the DM source of FRB 121102, and we obtain a 90% confidence level lower limit on the cosmic baryon density in the IGM in the low-redshift universe as .
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/aa7b2d