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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2024-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/ad16e4 |
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| author | Seppo Laine David Martínez-Delgado Kristi A. Webb Mohammad Akhlaghi Roberto Baena-Gallé Sanjaya Paudel Michael Stein Denis Erkal |
| author_facet | Seppo Laine David Martínez-Delgado Kristi A. Webb Mohammad Akhlaghi Roberto Baena-Gallé Sanjaya Paudel Michael Stein Denis Erkal |
| author_sort | Seppo Laine |
| collection | DOAJ |
| description | 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. |
| format | Article |
| id | doaj-art-1af9aa85800946fca4c5555f2ae1ef93 |
| institution | OA Journals |
| issn | 1538-4357 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-1af9aa85800946fca4c5555f2ae1ef932025-08-20T01:55:12ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-01962211110.3847/1538-4357/ad16e4Stellar Population Properties in the Stellar Streams around SPRC047Seppo Laine0https://orcid.org/0000-0003-1250-8314David Martínez-Delgado1https://orcid.org/0000-0003-3835-2231Kristi A. Webb2https://orcid.org/0000-0002-8610-0672Mohammad Akhlaghi3https://orcid.org/0000-0003-1710-6613Roberto Baena-Gallé4https://orcid.org/0000-0001-5214-7408Sanjaya Paudel5https://orcid.org/0000-0003-2922-6866Michael Stein6https://orcid.org/0000-0001-8428-7085Denis Erkal7https://orcid.org/0000-0002-8448-5505IPAC , Mail Code 314-6, Caltech, 1200 E. California Blvd., Pasadena, CA 91125, USA ; seppo@ipac.caltech.eduInstituto de Astrofísica de Andalucía , CSIC, E-18080 Granada, SpainWaterloo Centre for Astrophysics, University of Waterloo , Waterloo, ON N2L3G1, Canada; Department of Physics and Astronomy, University of Waterloo , Waterloo, ON N2L 3G1, CanadaCentro de Estudios de Física del Cosmos de Aragón (CEFCA) , Unidad Asociada al CSIC, Plaza San Juan 1, E-44001, Teruel, SpainUniversidad Internacional de la Rioja , Avenida de la Paz 137, E-26006 Logroño, La Rioja, SpainDepartment of Astronomy, Yonsei University , Seoul 03722, Republic of Korea; Center for Galaxy Evolution Research, Yonsei University , Seoul 03722, Republic of KoreaRuhr University Bochum , Faculty of Physics and Astronomy, Astronomical Institute (AIRUB), D-44780 Bochum, GermanyDepartment of Physics, University of Surrey , Guildford GU2 7XH, UKWe 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.https://doi.org/10.3847/1538-4357/ad16e4Stellar streamsTidal disruptionGalaxy mergersGalaxy evolutionAstronomy image processingSpectral energy distribution |
| spellingShingle | Seppo Laine David Martínez-Delgado Kristi A. Webb Mohammad Akhlaghi Roberto Baena-Gallé Sanjaya Paudel Michael Stein Denis Erkal Stellar Population Properties in the Stellar Streams around SPRC047 The Astrophysical Journal Stellar streams Tidal disruption Galaxy mergers Galaxy evolution Astronomy image processing Spectral energy distribution |
| title | Stellar Population Properties in the Stellar Streams around SPRC047 |
| title_full | Stellar Population Properties in the Stellar Streams around SPRC047 |
| title_fullStr | Stellar Population Properties in the Stellar Streams around SPRC047 |
| title_full_unstemmed | Stellar Population Properties in the Stellar Streams around SPRC047 |
| title_short | Stellar Population Properties in the Stellar Streams around SPRC047 |
| title_sort | stellar population properties in the stellar streams around sprc047 |
| topic | Stellar streams Tidal disruption Galaxy mergers Galaxy evolution Astronomy image processing Spectral energy distribution |
| url | https://doi.org/10.3847/1538-4357/ad16e4 |
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