2018A&A...615A..46M


C.D.S. - SIMBAD4 rel 1.7 - 2020.08.09CEST08:18:31

2018A&A...615A..46M - Astronomy and Astrophysics, volume 615A, 46-46 (2018/7-1)

The Lyman Alpha Reference Sample. IX. Revelations from deep surface photometry.

MICHEVA G., OSTLIN G., ZACKRISSON E., HAYES M., MELINDER J., GUAITA L., CANNON J.M., BRIDGE J.S., KUNTH D. and SANDBERG A.

Abstract (from CDS):


Context. The Lyman α Reference Sample (LARS) of 14 star-forming galaxies offers a wealth of insight into the workings of these local analogs to high-redshift star-forming galaxies. The sample has been well-studied in terms of Lyα and other emission line properties, such as HI mass, gas kinematics, and morphology.
Aims. We analyze deep surface photometry of the LARS sample in UBIK broadband imaging obtained at the Nordic Optical Telescope and the Canada-France-Hawaii Telescope, and juxtaposition their derived properties with a sample of local high-redshift galaxy analogs, namely, with blue compact galaxies (BCGs).
Methods. We construct radial surface brightness and color profiles with both elliptical and isophotal integration, as well as RGB images, deep contours, color maps, a burst fraction estimate, and a radial mass-to-light ratio profile for each LARS galaxy. Standard morphological parameters like asymmetry, clumpiness, the Gini and M20 coefficients are also obtained and analyzed, as well as isophotal asymmetry profiles for each galaxy. In this context, we compare the LARS sample to the properties of the BCG sample and highlight the differences.
Results. Several of these diagnostics indicate that the LARS galaxies have highly disturbed morphologies even at the level of the faintest outer isophotes, with no hint at a regular underlying population, as found in many BCG sample galaxies. The ground-based photometry reaches isophotes down to ∼28mag/arcsec2, while the space-based data reach only ∼26mag/arcsec2. The ground-based observations therefore reveal previously unexplored isophotes of the LARS galaxies. The burst fraction estimate suggests a spatially more extended burst region in LARS than in the BCGs. Comparison to stellar evolutionary models in color-color diagrams reveals complex behavior of the radial color profiles, often inconsistent with a single stellar population of any age and metallicity, but instead suggesting a mixture of at least two stellar populations with a typical young mass fraction in the range 0.1-1%.
Conclusions. The galaxies in the LARS sample appear to be in earlier stages of a merger event compared to the BCGs. Standard morphological diagnostics like asymmetry, clumpiness, Gini and M20 coefficients cannot separate the two samples, although an isophotal asymmetry profile successfully captures the average difference in morphology. These morphological diagnostics do not show any correlation with the equivalent width or the escape fraction of Lyman Alpha.

Abstract Copyright: © ESO 2018

Journal keyword(s): galaxies: evolution - galaxies: individual : LARS - galaxies: irregular - galaxies: starburst - galaxies: photometry

Simbad objects: 21

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Number of rows : 21

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ESO 350-38 AGN 00 36 52.489 -33 33 17.23   14.31 14.41 13.49   ~ 291 0
2 LEDA 2816291 Sy1 01 50 28.3910010185 +13 08 58.404065463           ~ 42 0
3 [PBT2001] SBSG 0335-052 W G 03 37 38.40 -05 02 37.5   19.14     18.85 ~ 98 1
4 NGC 1487 GiP 03 55 46.5 -42 22 01   12.28 11.68 11.74 11.02 ~ 102 0
5 SDSS J081152.12+473026.2 G 08 11 52.118 +47 30 26.25           ~ 11 0
6 2MFGC 6625 EmG 08 23 54.9669334368 +28 06 21.605409814   15.5       ~ 56 0
7 SHOC 240 H2G 09 07 04.888 +53 26 56.60           ~ 24 0
8 LARS 14 EmG 09 26 00.4041863336 +44 27 36.112149583           ~ 54 0
9 LEDA 27453 Sy2 09 38 13.4918143967 +54 28 24.976826000   17.73 17.07     ~ 56 0
10 2MASX J12501385+0734443 G 12 50 13.857 +07 34 44.33           ~ 33 0
11 Mrk 61 EmG 13 01 41.527 +29 22 52.84   16.96 16.65     ~ 36 0
12 LEDA 2469933 G 13 07 28.448 +54 26 52.51           ~ 16 0
13 UGC 8335 PaG 13 15 32.5 +62 07 37           ~ 51 0
14 Ton 151 AGN 13 16 03.915 +29 22 54.05   16.71 16.35     ~ 64 0
15 Mrk 259 SBG 13 28 44.000 +43 55 50.29   16.5       ~ 45 0
16 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3794 4
17 Mrk 1486 H2G 13 59 50.9093088961 +57 26 22.936953937   17.0       ~ 50 0
18 FIRST J140347.2+062811 rG 14 03 47.224 +06 28 12.18           ~ 17 0
19 ESO 513-11 PaG 15 00 27.10 -26 26 57.0   15.85       ~ 52 0
20 LARS 6 G 15 45 44.524 +44 15 51.85           ~ 15 0
21 UGC 10028 G 15 45 46.267 +44 14 53.02   15.7       ~ 12 0

    Equat.    Gal    SGal    Ecl

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2020.08.09-08:18:31

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