Sepideh Eskandarlou
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View article: J-PLUS: Turning Off the Bright Stars
J-PLUS: Turning Off the Bright Stars Open
Photometric surveys require precise point spread function (PSF) characterization, as it varies across filters and is crucial for accurate photometry and low surface brightness (LSB) studies. However, the small PSF size provided by default …
View article: Stellar tidal streams around nearby spiral galaxies with deep imaging from amateur telescopes
Stellar tidal streams around nearby spiral galaxies with deep imaging from amateur telescopes Open
Context. Tidal interactions between massive galaxies and their satellites are fundamental processes in a universe with a Λ cold dark matter (ΛCDM) cosmology, and they redistribute material into faint features that preserve records of past …
View article: LIGHTS
LIGHTS Open
The LIGHTS survey is imaging galaxies at a depth and spatial resolution comparable to what the Legacy Survey of Space and Time (LSST) will produce in 10 years (i.e., ∼31 mag/arcsec 2 ; 3 σ in areas equivalent to 10″×10″). This opens up the…
View article: LIGHTS. The extended point spread functions of the LIGHTS survey at the LBT
LIGHTS. The extended point spread functions of the LIGHTS survey at the LBT Open
With the arrival of the next generation of ultra-deep optical imaging surveys reaching 30 mag/arcsec (3 ; 10′′ 10′′), the removal of scattered light due to the point spread function (PSF) effect remains a critical step for the scientif…
View article: LIGHTS. The extended point spread functions of the LIGHTS survey at the LBT
LIGHTS. The extended point spread functions of the LIGHTS survey at the LBT Open
With the arrival of the next generation of ultra-deep optical imaging surveys reaching 30 mag/arcsec (3 ; 10′′ 10′′), the removal of scattered light due to the point spread function (PSF) effect remains a critical step for the scientif…
View article: UV LIGHTS. New tools for revealing the low surface brightness regime in the ultraviolet
UV LIGHTS. New tools for revealing the low surface brightness regime in the ultraviolet Open
Ultra-deep optical imaging surveys have reached unprecedented depths (≳30$ mag $; 3σ, 10 thus facilitating the study of very faint galactic structures. However, the ultraviolet bands, which are key to the study of stellar populations, rema…
View article: J-PLUS: Spectroscopic validation of H<i>α</i> emission line maps in spatially resolved galaxies
J-PLUS: Spectroscopic validation of H<i>α</i> emission line maps in spatially resolved galaxies Open
Aims . We present a dedicated automated pipeline to construct spatially resolved emission H α +[NII] maps and to derive the spectral energy distributions (SEDs) in 12 optical filters (five broad and seven narrow and medium) of H α emission…
View article: J-PLUS: Spectroscopic validation of H$α$ emission line maps in spatially resolved galaxies
J-PLUS: Spectroscopic validation of H$α$ emission line maps in spatially resolved galaxies Open
We present a dedicated automated pipeline to construct spatially resolved emission H$α$+[NII] maps and to derive the spectral energy distributions (SEDs) in 12 optical filters (five broad and seven narrow/medium) of H$α$ emission line regi…
View article: Andromeda's tenuous veil: extensive nebular emission near (yet far from) M31
Andromeda's tenuous veil: extensive nebular emission near (yet far from) M31 Open
A large, faint nebula was unexpectedly discovered near M31 using narrowband [O III] images. Its apparent size and the lack of a clear counterpart at other wavelengths make it unique and challenging to explain. We aim to determine whether t…
View article: LIGHTS. Survey Overview and a Search for Low Surface Brightness Satellite Galaxies
LIGHTS. Survey Overview and a Search for Low Surface Brightness Satellite Galaxies Open
We present an overview of the LBT Imaging of Galactic Halos and Tidal Structures survey, which currently includes 25 nearby galaxies that are on average ∼1 mag fainter than the Milky Way, and a catalog of 54 low central surface brightness …
View article: Gnuastro: Generating Polar Plots in Astronomical Images
Gnuastro: Generating Polar Plots in Astronomical Images Open
When a structure displays dependence on distance and azimuthal angle from a center (for example the spiral arms of galaxies or the diffraction spikes of stars), projecting the pixels to polar coordinates greatly simplifies their study. Thi…
View article: Gnuastro: Generating polar plots in Astronomical images
Gnuastro: Generating polar plots in Astronomical images Open
When a structure displays dependence on distance and azimuthal angle from a center (for example the spiral arms of galaxies or the diffraction spikes of stars), projecting the pixels to polar coordinates greatly simplifies their study. Thi…
View article: LIGHTS. Survey Overview and a Search for Low Surface Brightness Satellite Galaxies
LIGHTS. Survey Overview and a Search for Low Surface Brightness Satellite Galaxies Open
We present an overview of the LIGHTS (LBT Imaging of Galactic Halos and Tidal Structures) survey, which currently includes 25 nearby galaxies that are on average $\sim$ 1 mag fainter than the Milky Way, and a catalog of 54 low central surf…
View article: Gnuastro: Measuring Radial Profiles from Images
Gnuastro: Measuring Radial Profiles from Images Open
Radial profiles play a crucial role in the analysis and interpretation of astronomical data, facilitating the extraction of spatial information. However, highly customizable (for different scenarios) measurements over each elliptical annul…
View article: Data supplement of the paper on Gnuastro's radial-profile script
Data supplement of the paper on Gnuastro's radial-profile script Open
Data supplements for the paper titled "Gnuastro: measuring radial profiles from images", published in Research Notes of the American Astronomical Society (RNAAS) journal. This paper describes a GNU Astronomy Utilities (Gnuastro) script in …
View article: Data supplement of the paper on Gnuastro's radial-profile script
Data supplement of the paper on Gnuastro's radial-profile script Open
Data supplements for the paper titled "Gnuastro: measuring radial profiles from images", published in Research Notes of the American Astronomical Society (RNAAS) journal. This paper describes a GNU Astronomy Utilities (Gnuastro) s…
View article: Gnuastro: measuring radial profiles from images
Gnuastro: measuring radial profiles from images Open
Radial profiles play a crucial role in the analysis and interpretation of astronomical data, facilitating the extraction of spatial information. However, highly customizable (for different scenarios) measurements over each elliptical annul…
View article: Gnuastro: Estimating the Zero-point Magnitude in Astronomical Imaging
Gnuastro: Estimating the Zero-point Magnitude in Astronomical Imaging Open
Calibration of pixel values is a fundamental step for accurate measurements in astronomical imaging. In astronomical jargon this is known as estimating zero-point magnitude. Here, we introduce a newly added script in GNU Astronomy Utilitie…
View article: Gnuastro: Estimating the Zero Point Magnitude in Astronomical Imaging
Gnuastro: Estimating the Zero Point Magnitude in Astronomical Imaging Open
Calibration of pixel values is a fundamental step for accurate measurements in astronomical imaging. In astronomical jargon this is known as estimating zero point magnitude. Here, we introduce a newly added script in GNU Astronomy Utilitie…
View article: Data supplement for paper on Gnuastro's zero point measurement script
Data supplement for paper on Gnuastro's zero point measurement script Open
Data supplements to the paper titled "Gnuastro: Estimating the Zero Point Magnitude in Astronomical Imaging", published in Research Notes of the American Astronomical Society (RNAAS) journal (arXiv:2312.04263). This paper introduces a rece…
View article: Data supplement for paper on Gnuastro's zero point measurement script
Data supplement for paper on Gnuastro's zero point measurement script Open
Data supplements to the paper titled "Gnuastro: Estimating the Zero Point Magnitude in Astronomical Imaging", published in Research Notes of the American Astronomical Society (RNAAS) journal (arXiv:2312.04263). This paper introduces a rece…
View article: NGC 2022, a case study of a multiple-shell planetary nebula
NGC 2022, a case study of a multiple-shell planetary nebula Open
We present a detailed study of the physical properties, history of mass loss, and chemical abundances of the planetary nebula NGC 2022. New imaging observations obtained with the OAJ/JAST80 and NOT/ALFOSC confirm the presence of a faint ∼8…
View article: Costs and benefits of automation for astronomical facilities
Costs and benefits of automation for astronomical facilities Open
The Observatorio Astrof\\'isico de Javalambre (OAJ{\\dag}1) in Spain is a young\nastronomical facility, conceived and developed from the beginning as a fully\nautomated observatory with the main goal of optimizing the processes in the\nsci…