A MUSE View of the Core of the Giant Low Surface Brightness Galaxy Malin 1
Astronomy & Astrophysics(2024)
摘要
Aims. The central region of the Giant Low Surface Brightness galaxy Malin 1
has long been known to have a complex morphology with evidence of a bulge,
disc, and potentially a bar hosting asymmetric star formation. In this work, we
use VLT/MUSE data to resolve the central region of Malin 1 in order to
determine its structure. Methods. We use careful light profile fitting in every
image slice of the datacube to create wavelength-dependent models of each
morphological component, from which we could cleanly extract their spectra. We
then used the kinematics and emission line properties from these spectra to
better understand the nature of each component extracted from our model fit.
Results. We report the detection of a pair of distinct sources at the centre of
this galaxy with a separation of 1.05", which corresponds to a separation on
sky of 1.9 kpc. The radial velocity data of each object confirms that they
both lie in the kinematic core of the galaxy, and analysis of the emission
lines reveals that the central compact source is more consistent with being
ionized by star formation and/or a LINER, while the off-centre compact source
lies closer to the separation between star-forming galaxies and AGN.
Conclusions. This evidence suggests that the centre of Malin 1 hosts either a
bar with asymmetric star formation or two distinct components in which the
off-centre compact source could either be a star-forming clump containing one
or more star clusters that is in the process of falling into the core of the
galaxy and which will eventually merge with the central NSC, or a clump of gas
infalling into the centre of the galaxy from either outside or from the disc
and triggering star formation there.
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