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J/A+A/607/A107         GRB 080810 Keck/HIRES spectrum           (Wiseman+, 2017)

Gas inflow and outflow in an interacting high-redshift galaxy. The remarkable host environment of GRB 080810 at z = 3.35. Wiseman P., Perley D. A., Schady P., Prochaska J. X., de Ugarte Postigo A., Kruehler T., Yates R. M., Greiner J <Astron. Astrophys. 607, A107 (2017)> =2017A&A...607A.107W (SIMBAD/NED BibCode)
ADC_Keywords: Gamma rays ; Spectroscopy Keywords: galaxies: evolution - galaxies: interactions - gamma-ray burst: individual: 080810 Abstract: We reveal multiple components of an interacting galaxy system at z∼3.35 through a detailed analysis of the exquisite high-resolution Keck/HIRES spectrum of the afterglow of a gamma-ray burst (GRB). Through Voigt-profile fitting of absorption lines from the Lyman-series, we constrain the neutral hydrogen column density to NHI≤1018.35cm-2 for the densest of four distinct systems at the host redshift of GRB 080810, among the lowest NHI ever observed in a GRB host, despite the line of sight passing within a projected 5kpc of the galaxy centres. By detailed analysis of the corresponding metal absorption lines, we derive chemical, ionic and kinematic properties of the individual absorbing systems, and thus build a picture of the host as a whole. Striking differences between the systems imply that the line of sight passes through several phases of gas: the star-forming regions of the GRB host; enriched material in the form of a galactic outflow; the hot and ionised halo of a second, interacting galaxy falling towards the host at a line-of-sight velocity of 700km/s; and a cool, metal-poor cloud which may represent one of the best candidates yet for the inflow of metal-poor gas from the intergalactic medium. Description: On 2008-08-10 at T0=13:10:12 UT, the Burst Alert Telescope on board Swift triggered on GRB 080810 2008), which at T0+80s was detected as a bright source in Swift's X-ray Telescope (XRT) and Ultra-violet and Optical Telescope (UVOT). Starting 37.6 minutes after the trigger at 13:47:50 UT, GRB 080810 was observed with the High Resolution Echelle Spectrometer (HIRES) mounted on the 10-metre Keck I telescope of the W. M Keck Observatory located at the summit of Mauna Kea, Hawaii. A series of two exposures of 1000 s each were taken using the C5 decker, providing a FWHM spectral resolution of ∼8km/s. The normalised reduced Keck/HIRES spectrum of GRB 080810 in ASCII format. The respective FITS header appears first, and is commented out with #. Objects: ------------------------------------------------------------- RA (2000) DE Designation(s) ------------------------------------------------------------- 23 47 10.48 +00 19 11.3 GRB 080810 = Fermi bn080810549 ------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 124 1 Information on spectrum file spectrum.dat 45 173311 GRB 080810 normalised reduced Keck/HIRES spectrum
Byte-by-byte Description of file: list.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Name Name 12- 13 I2 h RAh Right ascension (J2000) 15- 16 I2 min RAm Right ascension (J2000) 18- 22 F5.2 s RAs Right ascension (J2000) 24 A1 --- DE- Declination sign (J2000) 25- 26 I2 deg DEd Declination (J2000) 28- 29 I2 arcmin DEm Declination (J2000) 31- 34 F4.1 arcsec DEs Declination (J2000) 36- 41 I6 --- Nx Number of points 43- 51 F9.4 0.1nm blambda Lower value of wavelength interval 53- 61 F9.4 0.1nm Blambda Upper value of wavelength interval 63- 74 A12 --- FileName Name of the spectrum file 76-124 A49 --- Title Title of the file
Byte-by-byte Description of file (# headlines): spectrum.dat
Bytes Format Units Label Explanations
8- 16 F9.4 0.1nm lambda [3458.2153/7818.0631] Wavelength 19- 32 E14.10 --- NFlux Normalised flux 37- 45 F9.7 --- e_NFlux Normalised flux error
Acknowledgements: Philip Wiseman, wiseman(at)mpe.mpg.de
(End) Philip Wiseman [MPE], Patricia Vannier [CDS] 25-Jul-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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