In an effort to probe the origin of surface brightness profile (SBP) breaks widely observed in nearby disk galaxies, we carry out a comparative study of stellar population profiles of 635 disk galaxies selected from the MaNGA spectroscopic survey. We classify our galaxies into single exponential (TI), down-bending (TII) and up-bending (TIII) SBP types, and derive their spin parameters and radial profiles of age/metallicity-sensitive spectral features. Most TII (TIII) galaxies have down-bending (up-bending) star formation rate (SFR) radial profiles, implying that abrupt radial changes of SFR intensities contribute to the formation of both TII and TIII breaks. Nevertheless, a comparison between our galaxies and simulations suggests that stellar migration plays a significant role in weakening down-bending $Σ_{\star}$ profile breaks. While there is a correlation between the break strengths of SBPs and age/metallicity-sensitive spectral features for TII galaxies, no such correlation is found for TIII galaxies, indicating that stellar migration may not play a major role in shaping TIII breaks, as is evidenced by a good correspondence between break strengths of $Σ_{\star}$ and surface brightness profiles of TIII galaxies. We do not find evidence for galaxy spin being a relevant parameter for forming different SBP types, nor do we find significant differences between the asymmetries of galaxies with different SBP types, suggesting that environmental disturbances or satellite accretion in the recent past do not significantly influence the break formation. By dividing our sample into early and late morphological types, we find that galaxies with different SBP types follow nearly the same tight stellar mass-$R_{25}$ relation, which makes the hypothesis that stellar migration alone can transform SBP types from TII to TI and then to TIII highly unlikely.
SDSS-IV MaNGA: Distinct Structural Growth and Star Formation in Low and High Surface Brightness Disks
Xiamen University（厦门大学）；Shanghai Astronomical Observatory, Chinese Academy of Sciences（中国科学院上海天文台）；Zhejiang University（浙江大学）；University of Science and Technology of China（中国科学技术大学）
We present the second data release for the HI-MaNGA programme of HI follow-up observations for the SDSS-IV MaNGA survey. This release contains measurements for 3669 unique galaxies, combining 2108 Green Bank Telescope observations with an updated crossmatch of the MaNGA sample with the ALFALFA survey. We combine these data with MaNGA spectroscopic measurements to examine relationships between HI-to-stellar mass ratio (M_HI/M_*) and average ISM/star formation properties probed by optical emission lines. M_HI/M_* is very weakly correlated with the equivalent width of Halpha, implying a loose con…
We consider the largest sample of 561 edge-on galaxies observed with integral field units by the MaNGA survey and find 300 galaxies where the ionised gas shows a negative vertical gradient (lag) in its rotational speed. We introduce the stop altitude as the distance to the galactic midplane at which the gas rotation should stop in the linear approximation. We find correlations between the lags, stop altitude and galactic mass, stellar velocity dispersion and overall Sersic index. We do not find any correlation of the lags or stop altitude with the star formation activity in the galaxies. We co…
We report here our finding of two new blueberry galaxies using optical IFU spectroscopic data from the MaNGA survey. Both the blueberries are found to be compact ($\leq$ $1 - 2$ kpc) starburst systems located at the outskirts of Low Surface Brightness (LSB) galaxies. Our blueberries have the lowest stellar masses $\sim$ 10$^{5}$ M$_{\odot}$ amongst the locally known blueberry galaxies. We find a significantly large mean metallicity difference ($\sim$ 0.5 dex) between the blueberry sources and their associated LSBs. Moreover, the radial metallicity gradients in our blueberries are also differen…
Validity of abundances derived from spaxel spectra of the MaNGA survey
我们测量了MaNGA星系光谱中的发射线，以确定其中的丰度分布。在MaNGA巡天的某些光谱中，低电离线R_2，N_2和S_2的强度可能由于扩散电离气体辐射的贡献而增加（相对于Balmer线）。因此，用强线法从光谱中得到的丰度值可能会有较大的误差。我们研究了这一预期通过比较的行为的线强度和丰度估计通过不同的校准狭缝光谱的HII地区在附近的星系，从SDSS的纤维光谱，和spiritual光谱的MANGA调查。我们发现，在纤维谱和光谱中，S_2强度显著增加。平均增强随金属含量而变化，并且可以大到2倍。R_2和N_2的平均畸变小于1.3倍。这表明Kaufmann et al.在BPT图中，AGNs与HII区的分界线是剔除N_2和R_2线强度明显畸变的谱的有用判据。我们发现，利用N_2和R_2线的三维R刻度，在MaNGA星系中产生了可靠的丰度。一维N2校准产生可靠的或错误的丰度，这取决于是否在目标区域中的激发和N/O丰度比（spectrometry）是接近或不同于位于接近校准关系的校准点中的那些参数。然后，我们确定了47个MaNGA星系的光盘内的光学半径的丰度分布。根据MaNGA观测数据构造的表面亮度剖面估算了星系的光学半径。
We present an extensive catalog of non-parametric structural properties derived from optical and mid-infrared imaging for 4585 galaxies from the MaNGA survey. DESI and WISE imaging are used to extract surface brightness profiles in the g, r, z, W1, W2 photometric bands. Our optical photometry takes advantage of the automated algorithm AutoProf and probes surface brightnesses that typically reach below 29 mag/arcsec^2 in the r band, while our WISE photometry achieves 28 mag/arcsec^2 in the W1 band. Neighbour density measures and central/satellite classifications are also provided for a large su…
Extreme emission-line galaxies, such as blue compact dwarfs (BCDs), Green Peas (GPs) and blueberries in the local Universe are the potential candidates to understand the nature of galaxies that re-ionized the early Universe. Being low-mass, metal-poor starburst systems they are understood as local analogs of the high redshift Lyman Continuum (LyC) and Lyman-$α$ emitters (LAEs). Even with their proximity to us, we know little about their spatially resolved properties, most of the blueberries and GPs are indeed compact, remain unresolved. Here, we report the detection of a disk-like lower-surfac…
We present the MaNGA Dwarf galaxy, MaNDala, Value-Added-Catalog, VAC, from the final release of the Sloan Digital Sky Survey-IV program. MaNDala consists of 136 randomly selected bright dwarf galaxies with $M_{*}<10^{9.1}\odot$ and $M_{g}>-18.5$ making it the largest Integral Field Spectroscopy homogeneous sample of dwarf galaxies. We release a photometric analysis of the $g,r$ and $z$ broadband imaging based on the DESI Legacy Imaging Surveys as well as the spectroscopic analysis based on the Pipe3D SDSS-IV VAC. Our release includes the surface brightness (SB), geometric parameters and color …
We find 132 face-on and low inclination galaxies with central star formation driven biconical gas outflows (FSFB) in the SDSS MaNGA (Mapping Nearby Galaxies at APO) survey. The FSFB galaxies show either double peaked or broadened emission line profiles at their centres. The peak and maximum outflow velocities are 58 and 212 km/s, respectively. The gas velocity dispersion reveals a mild dependence on the central star formation surface density compatible with models of gas dispersion powered by the Jeans instability in gas clumps or by gas turbulence dissipation. We estimate the gas outflow rate…
The role of active galactic nuclei (AGNs) during galaxy interactions and how they influence the star formation in the system are still under debate. We use a sample of 1156 galaxies in galaxy pairs or mergers (hereafter `pairs') from the MaNGA survey. This pair sample is selected by the velocity offset, projected separation, and morphology, and is further classified into four cases along the merger sequence based on morphological signatures. We then identify a total of 61 (5.5%) AGNs in pairs based on the emission-line diagnostics. No evolution of the AGN fraction is found, either along the me…
We investigate the dust attenuation in both stellar populations and ionized gas in kpc-scale regions in nearby galaxies, using integral field spectroscopy data from MaNGA MPL-9. We identify star-forming (HII) and diffuse ionized gas (DIG) regions from MaNGA datacubes. From the stacked spectrum of each region, we measure the stellar attenuation, $E(B-V)_{\rm star}$, using the technique developed by Li et al.(2020), as well as the gas attenuation, $E(B-V)_{\rm gas}$, from the Balmer decrement. We then examine the correlation of $E(B-V)_{\rm star}$, $E(B-V)_{\rm gas}$, $E(B-V)_{\rm gas}-E(B-V)_{\…
Off-centered spots of the enhanced gas velocity dispersion, s, are revealed in some galaxies from the MaNGA survey. Aiming to clarify the origin of the spots of enhanced s, we examine the distributions of the surface brightness, the line-of-sight velocity, the oxygen abundance, the gas velocity dispersion, and the BPT spaxel classification in seven galaxies. We find that the enhanced s spots in six galaxies can be attributed to a (minor) interaction with a satellite. Three galaxies in our sample have a very close satellite. The spots of enhanced s in those galaxies are located at the edge of t…
We present the MaNGA PyMorph photometric Value Added Catalogue (MPP-VAC-DR17) and the MaNGA Deep Learning Morphological VAC (MDLM-VAC-DR17) for the final data release of the MaNGA survey, which is part of the SDSS Data Release 17 (DR17). The MPP-VAC-DR17 provides photometric parameters from Sèrsic and Sèrsic+Exponential fits to the 2D surface brightness profiles of the MaNGA DR17 galaxy sample in the $g$, $r$, and $i$ bands (e.g. total fluxes, half light radii, bulge-disk fractions, ellipticities, position angles, etc.). The MDLM-VAC-DR17 provides Deep Learning-based morphological classificati…
SDSS-IV MaNGA PyMorph Photometric and Deep Learning Morphological Catalogs and implications for bulge properties and stellar angular momentum
我们描述了SDSS-IV MaNGA PyMorph光度（MPP-VAC）和MaNGA深度学习形态（MDLM-VAC）增值目录。MPP-VAC提供了来自Sérsic和Sérsic+Exponential拟合的光度学参数，用于MaNGA DR 15星系样本的2D表面亮度轮廓。与之前的PyMorph SDSS成像分析相比，我们对MaNGA DR 15的分析包含了三项改进：最新的SDSS图像;用于确定凸起到椎间盘分解的修改标准;以及MPP-VAC中的拟合已经过目测，并在必要时重新拟合，以获得额外的可靠性。伴随目录MDLM-VAC为相同的星系提供了基于深度学习的形态分类。MDLM-VAC包括许多形态学特性（例如，一个T型，和椭圆和S 0星系之间的更精细的分离）。结合MPP和MDLM-VAC可以表明，MDLM形态分类比以前的工作更可靠。它还表明，晚型和早型星系的单Sérsic拟合可能分别返回$n \le 2$和$\ge 4$的Sérsic指数，并且$n$和形态之间的这种相关性也延伸到了凸起部分。虽然前者是众所周知的，后者与最近的一些工作相矛盾，这些工作表明$n$ -凸起和形态之间几乎没有相关性。将这两种VAC与MaNGA的空间分辨光谱相结合，使我们能够研究恒星角动量如何取决于形态类型。我们发现恒星运动学，光度特性，和形态类型之间的相关性，即使光谱数据没有发挥作用的MPP和MDLM-VACs的…
This paper describes a search for galaxy centers with clear indications of unusual stellar populations with an initial mass function flatter than Salpeter at high stellar masses. Out of a sample of 668 face-on galaxies with stellar masses in the range 10^10- 10^11 M_sol, I identify 15 galaxies with young to intermediate age central stellar populations with unusual stellar population gradients in the inner regions of the galaxy. In these galaxies, the 4000 Angstrom break is either flat or rising towards the center of the galaxy, indicating that the central regions host evolved stars, but the H$…
Galaxies in dense environments, such as groups and clusters, experience various processes by which galaxies gain and lose gas. Using data from the SDSS-IV MaNGA survey, we previously reported the discovery of a giant (6 -- 8 kpc in diameter) H$α$ blob, Totoro, about 8 kpc away from a pair of galaxies (Satsuki and Mei) residing in a galaxy group which is experiencing a group-group merger. Here, we combine interferometric $^{12}$CO(1--0) molecular gas data, new wide-field H$α$, $u$-band data, and published X-ray data to determine the origin of the blob. Several scenarios are discussed to account…
We analyse the surface brightness profiles of disc-type galaxies in the EAGLE simulations in order to investigate the effects of galaxy mass and environment on galaxy profile types. Following observational works, we classify the simulated galaxies by their disc surface brightness profiles into single exponential (Type I), truncated (Type II) and anti-truncated (Type III) profiles. In agreement with previous observation and theoretical work, we find that Type II discs result from truncated star-forming discs that drive radial gradients in the stellar populations. In contrast, Type III profiles …
Projection-Enhanced Disk Breaks: Evidence from Deep Photometric Decomposition
Saint Petersburg State University（圣彼得堡国立大学）；Sternberg Astronomical Institute, Lomonosov Moscow State University（列蒙诺索夫莫斯科国立大学斯滕伯格天体物理研究所）；Special Astrophysical Observatory, Russian Academy of Sciences（俄罗斯科学院特殊天文台）
A fundamental assumption adopted in nearly every extragalactic emission-line study is that the attenuation of different emission lines can be described by a single attenuation curve. Here we show this assumption fails in many cases with important implications for derived results. We developed a new method to measure the differential nebular attenuation among three kinds of transitions: the Balmer lines of hydrogen, high-ionization transitions, and low-ionization transitions. This method bins the observed data in a multidimensional space spanned by attenuation-insensitive line ratios. Within ea…
SDSS-IV MaNGA: Star formation cessation in low-redshift galaxies I. Dependence on stellar mass and structural properties
我们调查径向梯度在最近的恒星形成历史（SFH）使用1917星系与$0.01<z<0.14$和积分场光谱正在进行的MANGA调查。对于每个星系，我们获得的二维地图和径向配置文件的三个光谱测量参数是敏感的最近的SFH：D $_n$（4000）（4000毫米的突破），EW（H $δ_A$）（H $δ$吸收线的等效宽度），和EW（H $α$）（H $α$发射线的等效宽度）。我们发现这些星系中的大多数spaxels与恒星形成率持续下降的模型一致，表明星暴很少发生在本地星系中。根据淬灭区在有效半径$f_Q(1.5R_e)$的1.5倍内所占的比例，我们将星系分为三类：完全成星（SF）、部分淬灭（PQ）和完全淬灭（TQ）。我们发现质量小于$10^{10}$ M $_{\odot}$的星系在所有的诊断参数上都呈现最弱的径向梯度。相比之下，恒星质量高于$10^{10}$ M $_{\odot}$的星系，如果被分类为SF或PQ，则在所有三个诊断参数中都呈现出显著的梯度，但如果在TQ类中，则在D $_n$（4000）和EW（H $δ_A$）中显示出弱梯度，而在EW（H $α$）中没有梯度。这意味着存在一个临界恒星质量，即$\sim10^{10}$ M $_{\odot}$，超过这个质量，星系中的恒星形成过程就会从内到外停止。星系在质量达到临界值之前，往往由内向外同步演化。我们进一步将固定质量的样本分为膨胀…
Inside-Out vs. Outside-In Quenching of MaNGA Galaxies: Dependence on Stellar Mass and Environment
National Tsing Hua University（国立清华大学）；Institute of Astronomy & Astrophysics, Academia Sinica（中央研究院天文及天文物理研究所）；Universidad Nacional Autónoma de México（墨西哥国立自治大学）；National Taiwan Normal University（台湾师范大学）；Hebei Normal University（河北师范大学）；Shanghai Astronomical Observatory, Chinese Academy of Sciences（中国科学院上海天文台）
Chemical enrichment in LINERs from MaNGA. II. Characterizing the shape of their radial metallicity gradients
Instituto de Astrofísica de Andalucía (IAA-CSIC)（安达卢西亚天体物理研究所）；Astronomisches Rechen-Institut, Zentrum für Astronomie der Universität Heidelberg（海德堡大学天体物理计算研究所）；Faculty of Physics, Ludwig-Maximilians-Universität（慕尼黑大学物理学院）；Main Astronomical Observatory, National Academy of Sciences of Ukraine（乌克兰国家科学院主天文台）；Institute of Astronomy, Pontificia Universidad Católica de Chile（智利天主教大学天文学研究所）；Centro de Astro-Ingeniería, Pontificia Universidad Católica de Chile（智利天主教大学天体工程中心）
We investigate the star formation histories (SFHs) of massive red spiral galaxies with stellar mass $M_\ast>10^{10.5}M_\odot$, and make comparisons with blue spirals and red ellipticals of similar masses. We make use of the integral field spectroscopy from the SDSS-IV/DR15 MaNGA sample, and estimate spatially resolved SFHs and stellar population properties of each galaxy by applying a Bayesian spectral fitting code to the MaNGA spectra. We find that both red spirals and red ellipticals have experienced only one major star formation episode at early times, and the result is independent of the a…
Recalibration of the H$α$ surface brightness-radius relation for planetary nebulae using Gaia DR3: new distances and the Milky Way oxygen radial gradient
Instituto de Física e Química, Universidade Federal de Itajubá（伊塔茹巴联邦大学物理与化学研究所）；Centro de Astrobiología (CSIC/INTA), ESAC（天体生物学中心（西班牙国家科学研究委员会/国家航空航天技术研究所）欧洲空间应用中心）；Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo（圣保罗大学天文、地球物理与大气科学研究所）；Núcleo Cosmo-Ufes & Departamento de Física – Universidade Federal do Espírito Santo（埃斯皮里托桑托联邦大学宇宙学核心与物理系）
Euclid Quick Data Release (Q1): Disc breaks highlight the structural evolution of galaxies through time
Instituto de Astrofísica de Canarias（加那利天体物理学研究所）；Universidad de La Laguna（拉帕鲁纳大学）；NASA Ames Research Center（美国宇航局艾姆斯研究中心）；Universidad de Cordoba（科尔多瓦大学）；Université PSL, Observatoire de Paris, Sorbonne Université, CNRS, LERMA（巴黎文理研究大学、巴黎天文台、索邦大学、法国国家科学研究中心、LERMA）；Université Paris-Cité（巴黎西岱大学）；Universidad de Valladolid（巴利亚多利德大学）；Laboratory for Disruptive Interdisciplinary Science (LaDIS)（颠覆性跨学科科学实验室）；Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciências, Universidade de Lisboa（里斯本大学理学院空间天体物理与科学研究所）
