The population of low surface brightness (LSB) galaxies, which are objects with central brightnesses at least one magnitude fainter than the night sky, is crucial for understanding extremes galactic formation and evolution universe. As LSB galaxies mostly rich in gas (H i), α.40 Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) sample best survey combinations to select a them local Since sky backgrounds systematically overestimated images by SDSS photometric pipeline, particularly...

Abstract We report the discovery of eight optical counterparts ALFALFA extragalactic objects from DECaLS, five which are discovered for first time. These were flagged as H i emission sources with no in SDSS before. Multiband data reveal their unusual physical properties. They faint and blue ( g − r = −0.35 ∼ 0.55), quite low surface brightness <?CDATA ${\mu }_{{\rm{g}},\mathrm{peak}}\,=\,24.88\sim 26.41\,\mathrm{mag}/{\mathrm{arcsec}}^{2}\;$?> <mml:math...

The accuracy of galaxy photometric redshift (photo-$z$) can significantly affect the analysis weak gravitational lensing measurements, especially for future high-precision surveys. In this work, we try to extract photo-$z$ information from both flux and image data expected be obtained by China Space Station Telescope (CSST) using neural networks. We generate mock images based on observational Advanced Camera Surveys Hubble (HST-ACS) COSMOS catalogs, considering CSST instrumental effects....

Abstract We estimate the stellar mass for a sample of low surface brightness galaxies (LSBGs) by fitting their multiband spectral energy distributions (SEDs) to population synthesis model. The derived masses (log M * / ⊙ ) span from 7.1 11.1, with mean log = 8.5, which is lower than that normal galaxies. mass-to-light ratio ( γ *) in each band varies little absolute magnitude but increases higher . This trend even stronger bluer bands. In addition, our LSBGs slightly declines r...

Low surface brightness (LSB) galaxies are with central fainter than the night sky. Due to faint nature of LSB and comparable sky background, it is difficult search automatically efficiently from large survey. In this study, we established Surface Brightness Galaxies Auto Detect model (LSBG-AD), which a data-driven for end-to-end detection Sloan Digital Sky Survey (SDSS) images. Object techniques based on deep learning applied SDSS field images identify estimate their coordinates at same...

This paper presents a relative flux calibration method for the Guoshoujing Telescope (LAMOST), which may be applied to connect blue spectrum red build whole across total wavelength range (3700 ∼ 9000 Å). In each spectrograph, we estimate effective temperatures of selected stars using grid spectral line indices in and comparison with stellar atmosphere models. For types A F are as pseudo-standard stars, theoretical spectra used calibrate both 5900 Å) spectrograph arms (5700 Then response...

Abstract We report the discovery of a possible accretion stream toward Milky Way–type galaxy M106 based on very deep H i imaging data with Five-hundred-meter Aperture Spherical radio Telescope (FAST). The extends for about 130 kpc in projection length and it is similar to Magellanic many respects. provide unambiguous evidence morphology, kinematics local star formation activity show that gas being accreted onto disk M106. Such long continuous flow provides unique opportunity probe...

Enhancing the antibacterial properties by regulating valence configurations of copper: a focus on Cu-carboxyl chelates.

We present a catalogue of an H i-selected sample 1129 low surface brightness galaxies (LSBGs) searched from the α.40-SDSS DR7 survey. This sample, consisting various types in terms luminosity and morphology, has extended parameter space covered by existing LSBG samples. Based on subsample 173 LSBGs that are selected our entire to have 2-horn shapes i line profiles, minor-to-major axial ratios (b/a) less than 0.6 signal-to-noise ratio detection greater 6.5, we investigated Tully–Fisher...

From $\sim$ 5000 deg$^{2}$ of the combination Beijing-Arizona Sky Survey (BASS) and Mayall $z$-band Legacy (MzLS) which is also northern sky region Dark Energy Spectroscopic Instrument (DESI) Imaging Surveys, we selected a sample 31,825 candidates low surface brightness galaxies (LSBGs) with mean effective 24.2 $< \bar{\mu}_{\rm eff,g} <$ 28.8 mag arcsec$^{\rm -2}$ half-light radius 2.5$^{\prime\prime}$ r_{\rm eff} 20$^{\prime\prime}$ based on released photometric catalogue machine learning...

Galaxy photometric redshift (photo-$z$) is crucial in cosmological studies, such as weak gravitational lensing and galaxy angular clustering measurements. In this work, we try to extract photo-$z$ information construct its probability distribution function (PDF) using the Bayesian neural networks (BNN) from both flux image data expected be obtained by China Space Station Telescope (CSST). The mock images are generated Advanced Camera for Surveys of Hubble ($HST$-ACS) COSMOS catalog, which...

Ultra-diffuse galaxies (UDGs) are objects which have very extended morphology and faint central surface brightness. Most UDGs discovered in galaxy clusters groups, but also some found low density environments. The diffuse brightness make them difficult to distinguish from the sky background. Several previous works suggested that at least consistent with exponential profiles (S\'{e}rsic n ~ 1). of disks is enhanced edge-on systems, so searching for systems may be an efficient way select UDGs....

We present the observed Hα flux and derived star formation rates (SFRs) for a fall sample of low-surface-brightness galaxies (LSBGs). The is selected from sky region 40% ALFALFA H i Survey–SDSS DR7 photometric data, all images were obtained using 2.16 m telescope, operated by National Astronomy Observatories, Chinese Academy Sciences. A total 111 LSBGs was measured in 92 them. Though almost our are i-rich, their SFRs, extinction filter-transmission-corrected flux, less than 1 M☉ yr−1....

Abstract We present a narrow H α -band imaging survey of 357 low surface brightness galaxies (LSBGs) that are selected from the spring sky region 40% Arecibo Legacy Fast L Feed Array (ALFALFA) i Survey. All images obtained 2.16 m telescope, operated by Xinglong Observatory National Astronomical Observatories, Chinese Academy Sciences. provide fluxes and derive global star formation rates (SFRs) LSBGs after Galactic extinction, internal [N ii ] contamination correction. Compared to normal...

Abstract Low-surface-brightness galaxies (LSBGs), fainter members of the galaxy population, are thought to be numerous. However, due their low surface brightness, search for a wide-area sample LSBGs is difficult, which in turn limits our ability fully understand formation and evolution as well relationships. Edge-on LSBGs, unique orientation, offer an excellent opportunity study structure components. In this work, we utilize You Only Look Once object detection algorithm construct edge-on...

ABSTRACT The Chinese Space Station Telescope (CSST) is scheduled to launch soon, which expected provide a vast amount of image potentially containing low-surface brightness galaxies (LSBGs). However, detecting and characterizing LSBGs known be challenging due their faint surface brightness, posing significant hurdle for traditional detection methods. In this paper, we propose LSBGnet, deep neural network specifically designed automatic LSBGs. We established LSBGnet-SDSS model using data set...

We introduce a holographic dark energy model that incorporates the first-order approximate Kaniadaski entropy, utilizing Hubble horizon, $1/H$, as infrared cutoff. investigate cosmological evolution within this framework. The introduces an extra parameter relative to $\Lambda$CDM model. It posits Universe is initially dominated by matter, which then evolves phase where becomes predominant component, with transition occurring at redshift of approximately $z \sim 0.419$. density ultimately...

The relative age of galaxies at different redshifts can be used to infer the Hubble parameter and put constraints on cosmological models. We select luminous red (LRGs) from Sloan Digital Sky Survey Data Release 7 then cross match it with MPA/JHU catalog obtain a large sample quiescent LRGs redshift z ∼ 0.03–0.39. total number LRGs, 23,883, is divided into four sub-samples according their velocity dispersions each sub-sample further 12 bins. spectra in bin are co-added order combined spectrum...

Adopting the SPECTRUM package, which is a stellar spectral synthesis program, we have synthesized comprehensive set of 2890 near-infrared (NIR) synthetic spectra with resolution and wavelength sampling similar to Sloan Digital Sky Survey (SDSS) forthcoming Large Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) spectra. During synthesis, applied "New grids ATLAS9 Model Atmosphere" develop grid local thermodynamic equilibrium model atmospheres for effective temperatures (Teff) ranging...

Abstract The color–stellar mass-to-light ratio relation (CMLR) is a widely accepted tool for estimating the stellar mass ( M * ) of galaxy. However, an individual CMLR tends to give distinct same galaxy when it applied in different bands. Examining five representative CMLRs from literature, we find that difference predicted bands optical near-infrared by 0.1 ∼ 0.3 dex. Based on sample low surface brightness galaxies covers wide range color and luminosity, therefore recalibrated each original...

Low surface brightness galaxies (LSBGs) are defined as that fainter than dark night sky and important for studying our universe. Particularly, edge-on useful the study of rotational velocity dynamical properties galaxies. Hence here we focus on searching LSBGs. In order to find these dim galaxies, a series effects caused by inclination, including profile, internal extinction, scale length, have been corrected. this work, present catalog 281 LSBG candidates, which selected from crossmatch...

Abstract We present a study of low surface brightness galaxies (LSBGs) selected by fitting the images for all in α .40 SDSS DR7 sample with two kinds single-component models and two-component (disk+bulge): single exponential, sérsic, exponential+deVaucular (exp+deV), exponential+sérsic (exp+ser). Under criteria B band disk central <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:msub> <mml:mrow> <mml:mi>μ</mml:mi> </mml:mrow> <mml:mn>0</mml:mn>...

Abstract Giant low surface brightness galaxies (GLSBGs) are fundamentally distinct from normal and other types of LSBGs in terms star formation evolution. In this work, we collected 27 local GLSBGs the literature. They have high stellar masses ( M * &gt; 10 ⊙ ) far-ultraviolet-based rates (SFRs). With specific (sSFRs) lower than characteristic value star-forming (SFGs) = (sSFR &lt; 0.1 Gyr −1 ), deviate main sequence (MS) defined for SFGs respectively by Elbaz et al. (E07) Saintonge (S16) at...