Nobeyama Millimeter Array Observations of GRB 030329: a Decay of Afterglow with Bumps and Molecular Gas in the Host Galaxy

Abstract

Nobeyama Millimeter Array was used to observe millimeter-wave afterglow of GRB 030329 at 93 GHz and 141 GHz from 2003 April 6 to 2003 May 30. A sensitive search for CO(J=1-0) emission/absorption from the host galaxy of GRB 030329 was also carried out. Unresolved millimeter continuum emission at the position of GRB 030329 was detected until 2003 April 21. We found a steep decline of continuum flux (\propto t^{-2.0}) during this period, in accord with a previous report. Moreover, our data implies that the decay was accompanied by possible plateaus phases, or bumps, on a time scale of several days. From an integrated spectrum, produced by summing up the data from 2003 April 10 to 2003 May 30, we found a possible emission feature, which could be a redshifted CO(J=1-0) line. Its position and redshift coincide well with those of GRB 030329, though further observations are required to confirm the detection. If the emission feature is real, the observed CO flux is 1.4 +/- 0.52 Jy km/s, corresponding to a large molecular gas mass of M(H_2) > 10^9 Mo. This implies that the host galaxy, which is optically faint, is highly obscured due to a rich interstellar medium.

arXiv comment13 pages, 4 figures, 1 table, to appear in PASJ

References in corpus (36)

• Star Formation in Galaxies Along the Hubble Sequence
• The Milky Way in Molecular Clouds: A New Complete CO Survey
• A very energetic supernova associated with the gamma-ray burst of 29 March 2003
• Rotating Nuclear Rings and Extreme Starbursts in Ultraluminous Galaxies
• Spectroscopic Discovery of the Supernova 2003dh Associated with GRB 030329
• A Common Origin for Cosmic Explosions Inferred from Fireball Calorimetry
• The Radio-to-Submm Spectral Index as a Redshift Indicator
• A 450-day light curve of the radio afterglow of GRB 970508: Fireball calorimetry
• Photometry and Spectroscopy of GRB 030329 and Its Associated Supernova 2003dh: The First Two Months
• High column densities and low extinctions of gamma-ray bursts: Evidence for hypernovae and dust destruction
• Massive star formation and evolution in starburst galaxies: mid-infrared spectroscopy with ISO-SWS
• A Submillimeter and Radio Survey of Gamma-Ray Burst Host Galaxies: A Glimpse into the Future of Star Formation Studies
• The detailed optical light curve of GRB 030329
• The Variable Light Curve of GRB 030329: The Case for Refreshed Shocks
• The bright optical afterglow of the nearby gamma-ray burst of 29 March 2003
• On The Spectrum and Spectropolarimetry of Type Ic Hypernova SN 2003dh/GRB 030329
• Variability in GRB Afterglows and GRB 021004
• Gamma-Ray Burst in a Molecular Cloud: Destruction of Dust and H2, and Emergent Spectrum
• A Jet Model for the Afterglow Emission from GRB000301C
• Are Starburst Galaxies the Hosts of Gamma-Ray Bursts ?
• The Discovery of the Radio Afterglow From the Optically Dim Gamma-Ray Burst of March 29, 1998
• The Host Galaxy of GRB980703 at Radio Wavelengths - a Nuclear Starburst in a ULIRG
• GRB 010222: A Burst Within a Starburst
• Millimeter Observations of GRB 030329: Continued Evidence for a Two-Component Jet
• Variability of GRB Afterglows Due to Interstellar Turbulence
• Host Galaxies of Gamma-ray Bursts: Spectral Energy Distributions and Internal Extinction
• Evidence for a Molecular Cloud Origin for Gamma-Ray Bursts: Implications for the Nature of Star Formation in the Universe
• A multi-colour study of the dark GRB 000210 host galaxy and its environment
• The Bright Gamma-Ray Burst 991208 - Tight Constraints on Afterglow Models from Observations of the Early-Time Radio Evolution
• SCUBA observations of the host galaxies of four dark gamma-ray bursts
• Optical-Infrared ANDICAM Observations of the Transient Associated with GRB 030329
• A Late-Time Flattening of Afterglow Light Curves
• A CO Survey of Gravitationally Lensed Quasars with the IRAM Interferometer
• Earliest detection of the optical afterglow of GRB 030329 and its variability
• Continued Radio Monitoring of the Gamma Ray Burst 991208
• Radio Observations of the Afterglow of GRB 030329

Cited by in corpus (17)

• Massive stars formed in atomic hydrogen reservoirs: HI observations of gamma-ray burst host galaxies
• Pre-ALMA observations of GRBs in the mm/submm range
• Two gamma-ray bursts from dusty regions with little molecular gas
• The unusual afterglow of the Gamma-Ray Burst 100621A
• A Very Close Binary Black Hole in a Giant Elliptical Galaxy 3C 66B and its Black Hole Merger
• The Radio to Infrared Emission of Very High Redshift Gamma-Ray Bursts: Probing Early Star Formation through Molecular and Atomic Absorption Lines
• Molecular gas masses of gamma-ray burst host galaxies
• Extragalactic Millimeter Transients in the Era of Next Generation CMB Surveys
• A Search for CO(J=3-2) Emission from the Host Galaxy of GRB 980425 with the Atacama Submillimeter Telescope Experiment
• A Revised Estimate of the CO (J=1-0) Emission from the Host Galaxy of GRB 030329 Using the Nobeyama Millimeter Array
• Constraints on Obscured Star Formation in Host Galaxies of Gamma-ray Bursts
• CO Observations of the Host Galaxy of GRB000418 at z = 1.1
• Radio Observations of GRB Host Galaxies
• ALMA CO Observations of the Host Galaxies of Long-duration Gamma-ray Bursts. I: Molecular Gas Scaling Relations
• Molecular Gas Properties in the Host Galaxy of GRB080207
• A new era of sub-millimeter GRB afterglow follow-ups with the Greenland Telescope
• GRB host galaxies with strong H${}_2$ absorption: CO-dark molecular gas at the peak of cosmic star formation