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J/A+A/607/A43       NGC 4418/VV 655 HI images                 (Varenius+, 2017)

Atomic hydrogen bridge fueling NGC 4418 with gas from VV 655. Varenius E., Costagliola F., Kloeckner H.-R., Aalto S., Spoon H., Marti-Vidal I., Conway J.E., Privon C., Koenig S. <Astron. Astrophys. 607, A43 (2017)> =2017A&A...607A..43V (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, optical ; H I data Keywords: galaxies: interactions - galaxies: irregular - galaxies: starburst - quasars: individual: NGC4418 -galaxies: individual: VV655 Abstract: The galaxy NGC4418 harbours a compact (<20pc) core with a very high bolometric luminosity (∼1011L). As most of the galaxy's energy output comes from this small region, it is of interest to determine what fuels this intense activity. An interaction with the nearby blue irregular galaxy VV655 has been proposed, where gas aquired by NGC4418 could trigger intense star formation and/or black hole accretion in the centre. We aim to constrain the interaction hypothesis by studying neutral hydrogen structures which could reveal tails and debris connecting NGC4418 to the nearby galaxy VV655. We present observations at 1.4GHz with the Very Large Array (VLA) of radio continuum as well as emission and absorption from atomic hydrogen. Gaussian distributions are fitted to observed HI emission and absorption spectra.We estimate the star formation rate (SFR) of NGC4418 and VV655 from the 1.4GHz radio emission and compare with estimates from archival 70um Herschel observations. Description: We present data from the VLA taken in D configuration in project AS748 (PI: H. Spoon) on 2003-03-21 with 5.3h on source. The parrallel hands (RR,LL) were correlated with phase centre R.A. 12:26:59.750 and Dec. -00:53:31.50 and the data stored in the archive with time resolution of 30 seconds and spectral resolution of 48.8kHz per channel. The total bandwidth covered 63 channels, centered on 1.41017559GHz. Objects: --------------------------------------------------- RA (2000) DE Designation(s) --------------------------------------------------- 12 26 54.63 -00 52 39.5 NGC 4418 = LEDA 40762 12 27 04.53 -00 54 21.1 VV 655 = LEDA 40790 --------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file list.dat 133 2 List of fits files fits/* 0 2 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- 58 A26 --- Obs.Date Observation date 60- 66 F7.5 GHz Freq Observed frequency or lower value of frequency interval for the datacube 68- 74 F7.5 GHz BFreq ? Upper value of frequency interval for the datacube 76- 82 F7.1 Hz dFreq ? Frequency resolution for the datacube 84- 88 I5 Kibyte size Size of FITS file 90-110 A21 --- FileName Name of FITS file, in subdirectory fits 112-133 A22 --- Title Title of the FITS file
Acknowledgements: Eskil Varenius, eskil.varenius(at)
(End) Patricia Vannier [CDS] 12-Sep-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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