2018ApJ...863L...7M


Query : 2018ApJ...863L...7M

2018ApJ...863L...7M - Astrophys. J., 863, L7-L7 (2018/August-2)

BST1047+1156: an extremely diffuse and gas-rich object in the Leo I group.

MIHOS J.C., CARR C.T., WATKINS A.E., OOSTERLOO T. and HARDING P.

Abstract (from CDS):

We report the detection of diffuse starlight in an extragalactic H I cloud in the nearby Leo I galaxy group. We detect the source, BST1047+1156, in both broadband optical and the Galaxy Evolution Explorer (GALEX) ultraviolet (UV) light. Spanning ∼2 kpc in radius, it has a peak surface brightness of µB = 28.8 mag arcsec–2, making it the lowest surface brightness object ever detected via integrated light. Although the object is extremely gas rich, with a gas fraction of fg = 0.99, its peak H I column density is well below levels where star formation is typically observed in galaxies. Nonetheless, BST1047+1156 shows evidence for young stellar populations: along with the detected UV emission, the object is extremely blue, with B - V = 0.14 ± 0.09. The object has two tidal tails and is found embedded within diffuse gas connecting the spiral galaxy M96 to the group's extended H I Leo Ring. The nature of BST1047+1156 is unclear. It could be a disrupting tidal dwarf, recently spawned from star formation triggered in the Leo I group's tidal debris. Alternatively, the object may have been a pre-existing galaxy-the most extreme example of a gas-rich field low surface brightness galaxy known to date-which had a recent burst of star formation triggered by encounters in the group environment.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: evolution - galaxies: groups: individual: Leo I - galaxies: interactions - galaxies: irregular - galaxies: structure

Nomenclature: Table 1: [MCW2018] BST J1047+1156 N=1.

Simbad objects: 10

goto Full paper

goto View the references in ADS

Number of rows : 10
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 NAME Leo T G 09 34 53.4 +17 03 05     15.1     ~ 330 0
2 NAME Leo I dSph G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1101 1
3 NAME Leo P BiC 10 21 45.123 +18 05 16.89           ~ 168 0
4 M 96 GiP 10 46 45.744 +11 49 11.78 10.42 10.15 9.25 8.99   ~ 766 1
5 [MCW2018] BST J1047+1156 LSB 10 47 43.8 +11 56 01   20.02 19.86     ~ 2 0
6 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1401 0
7 NAME M96 Group GrG 10 48 +13.3           ~ 287 0
8 NAME Coma P G 12 32 10.3 +20 25 24           ~ 21 0
9 NAME Local Group GrG ~ ~           ~ 7364 0
10 NAME Leo Ring HI ~ ~           ~ 45 0

To bookmark this query, right click on this link: simbad:objects in 2018ApJ...863L...7M and select 'bookmark this link' or equivalent in the popup menu


2021.09.29-03:47:42

© Université de Strasbourg/CNRS

    • Contact