Stellar Population Properties in the Stellar Streams around SPRC047
We have investigated the properties (e.g., age, metallicity) of the stellar populations of a ringlike tidal stellar stream (or streams) around the edge-on galaxy SPRC047 ( z = 0.031) using spectral energy distribution (SED) fits to integrated broadband aperture flux densities. We used...
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/ad16e4 |
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| Summary: | We have investigated the properties (e.g., age, metallicity) of the stellar
populations of a ringlike tidal stellar stream (or streams) around the edge-on
galaxy SPRC047 ( z = 0.031) using spectral energy
distribution (SED) fits to integrated broadband aperture flux densities. We used
visual images in six different bands and Spitzer/IRAC 3.6 μ m data. We have attempted to derive best-fit stellar population
parameters (metallicity, age) in three noncontiguous segments of the stream. Due
to the very low surface brightness of the stream, we have performed a
deconvolution with a Richardson–Lucy–type algorithm of the low spatial
resolution 3.6 μ m IRAC image, thereby reducing the
effect of the point-spread function aliased emission from the bright edge-on central galaxy at the locations
of our three stream segments. Our SED fits that used several different star
formation (SF) history priors, from an exponentially decaying SF burst to
continuous SF, indicate that the age–metallicity–dust degeneracy is not
resolved, most likely because of inadequate wavelength coverage and low
signal-to-noise ratios of the low surface brightness features. We also discuss
how future deep visual–near-infrared observations, combined with absolute flux
calibration uncertainties at or below the 1% level, complemented by equally well
absolute flux-calibrated observations in ultraviolet and mid-infrared bands,
would improve the accuracy of broadband SED fitting results for low surface
brightness targets, such as stellar streams around nearby galaxies that are not
resolved into stars. |
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| ISSN: | 1538-4357 |