2015ApJ...815L..29G


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.29CET01:15:56

2015ApJ...815L..29G - Astrophys. J., 815, L29 (2015/December-3)

Deep optical images of Malin 1 reveal new features.

GALAZ G., MILOVIC C., SUC V., BUSTA L., LIZANA G., INFANTE L. and ROYO S.

Abstract (from CDS):

We present Megacam deep optical images (g and r) of Malin 1 obtained with the 6.5 m Magellan/Clay telescope, detecting structures down to ∼28 B mag/arcsec2. In order to enhance galaxy features buried in the noise, we use a noise reduction filter based on the total generalized variation regularizator. This method allows us to detect and resolve very faint morphological features, including spiral arms, with a high visual contrast. For the first time, we can appreciate an optical image of Malin 1 and its morphology in full view. The images provide unprecedented detail, compared to those obtained in the past with photographic plates and CCD, including Hubble Space Telescope imaging. We detect two peculiar features in the disk/spiral arms. The analysis suggests that the first one is possibly a background galaxy, and the second is an apparent stream without a clear nature, but could be related to the claimed past interaction between Malin 1 and the galaxy SDSSJ123708.91+142253.2. Malin 1 exhibits features suggesting the presence of stellar associations and clumps of molecular gas, not seen before with such a clarity. Using these images, we obtain a diameter for Malin 1 of 160 kpc, ∼50 kpc larger than previous estimates. A simple analysis shows that the observed spiral arms reach very low luminosity and mass surface densities, to levels much lower than the corresponding values for the Milky Way.

Abstract Copyright:

Journal keyword(s): galaxies: general - galaxies: spiral - techniques: image processing

Simbad objects: 9

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Number of rows : 9

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11098 1
2 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5929 0
3 NGC 4571 GiP 12 36 56.3722472082 +14 13 02.297281940   13.6       ~ 305 1
4 NAME Malin 1B G 12 36 58.89 +14 19 43.9           ~ 3 0
5 2MASX J12365934+1419494 LSB 12 36 59.3469733716 +14 19 49.158501218   17.80       ~ 176 0
6 BD+15 2483 * 12 37 02.2883005133 +14 15 06.646377380 9.500 9.430 8.910     G0 8 0
7 SDSS J123708.91+142253.2 G 12 37 08.915 +14 22 53.25           ~ 4 0
8 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4287 2
9 NGC 7145 GiG 21 53 20.237 -47 52 56.96   12.13 11.23 10.77   ~ 110 0

    Equat.    Gal    SGal    Ecl

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2020.11.29-01:15:56

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