J/A+A/632/L13 NG5907 images (Mueller+, 2019)
Hunting ghosts: the iconic stellar stream(s) around NG5907 under scrutiny.
Mueller O., Vudragovic A., Bilek M.
<Astron. Astrophys. 632, L13 (2019)>
=2019A&A...632L..13M 2019A&A...632L..13M (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies ; Optical
Keywords: galaxies: individual: NGC 5907 - galaxies: formation -
techniques: image processing - galaxies: interactions -
galaxies: structure
Abstract:
Stellar streams are regarded as crucial objects to test galaxy
formation models, with their morphology tracing the underlying
potentials and their occurrence tracking the assembly history of the
galaxies. The existence of one of the most iconic stellar streams, the
double loop around NGC5907, has recently been questioned by new
observations with the Dragonfly telescope. This new work only finds
parts of the stream, even though they reach a 1 sigma surface
brightness limit of 30.3 mag per sq. arcsec in the g-band. Using 7.2
hours of Luminance L-band imaging with the Milankovic 1.4 meter
telescope, we have re-observed the putative double loop part to
confirm or reject this assessment. We do not find signs of the double
loop, but see only a single, knee-shaped stellar stream. Comparing our
to the data by the Dragonfly team, we find the same features. Our
observations reach a 1 sigma surface brightness limit of 29.7 mag per
sq. arcsec in the g-band. These findings emphasize the need for
independent confirmation of detections of very low-surface brightness
features.
Description:
The galaxy NGC 5907 was observed on three consecutive nights (24)26
October 2019) with the 1.4 meter Milankovic telescope mounted at the
Astronomical Station Vidohevica (Serbia), using anb Andor IKONL CCD
camera.
Data taken with the luminance L band filter with the Milankovich 1.4
meter telescope.
Objects:
------------------------------------------------
RA (2000) DE Designation(s)
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15 15 53.69 +56 19 43.9 NGC 5907 = UGC 9801
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 111 156 List of fits images
fits/* . 156 Individual fits images
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See also:
J/A+A/305/74 : NGC 4565, 4656 + 5907 ROSAT observations (Vogler+ 1996)
J/AJ/117/2757 : Surface photometry of NGC 5907 (Zheng+, 1999)
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- 24 D5.3 arcsec/pix scale ? Scale of the image
26- 29 I4 --- Nx Number of pixels along X-axis
31- 34 I4 --- Ny Number of pixels along Y-axis
36- 54 A19 "datime" Obs.date Observation date
56- 59 I4 Kibyte size Size of FITS file
61- 85 A25 --- FileName Name of FITS file, in subdirectory fits
87-111 A25 --- Title Title of the FITS file
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Acknowledgements:
Oliver Mueller, oliver.muller(at0astro.unistra.fr
(End) Oliver Mueller [ObAS], Patricia Vannier [CDS] 04-Dec-2019