A5034355007- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Scientific Research and Discoveries
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
- Superconducting Materials and Applications
- Astronomical Observations and Instrumentation
- Particle Accelerators and Free-Electron Lasers
- Geophysics and Gravity Measurements
- Astrophysics and Star Formation Studies
- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Cosmology and Gravitation Theories
- Advanced Statistical Methods and Models
- Geophysics and Sensor Technology
- Spectroscopy and Laser Applications
- Particle Detector Development and Performance
- High-pressure geophysics and materials
- Adaptive optics and wavefront sensing
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Particle accelerators and beam dynamics
- Geomagnetism and Paleomagnetism Studies
Chinese Academy of Sciences
1998-2024
University of Chinese Academy of Sciences
2024
Institute of High Energy Physics
2024
Tianjin Normal University
2002-2021
National Astronomical Observatories
1997-2005
Peking University
1998
Max Planck Institute for Astrophysics
1998
Max Planck Society
1992
Academia Sinica
1991
We investigate the photometric properties of early-type Brightest Cluster Galaxies (BCGs) using a carefully selected sample 85 BCGs from C4 cluster catalogue with redshift less than 0.1. perform accurate background subtractions and surface photometry for these to 25 mag arcsec−2 in Sloan r band. By quantitatively analysing gradient Petrosian profiles BCGs, we find that large fraction have extended stellar envelopes their outskirts; more luminous tend haloes are likely be connected mergers. A...
We search for ongoing major dry-mergers in a well selected sample of local Brightest Cluster Galaxies (BCGs) from the C4 cluster catalogue. 18 out 515 early-type BCGs with redshift between 0.03 and 0.12 are found to be dry-mergers, which as pairs (or triples) $r$-band magnitude difference $\dm<1.5$ projected separation $\rp<30$ kpc, showing signatures interaction form significant asymmetry residual images. find that fraction increases richness clusters, consistent fact richer clusters...
We report CO detections in 17 out of 19 infrared ultraluminous QSO (IR QSO) hosts observed with the IRAM 30m telescope. The cold molecular gas reservoir these objects is a range 0.2--2.1$\times 10^{10}M_\odot$ (adopting CO-to-${\rm H_2}$ conversion factor $\alpha_{\rm CO}=0.8 M_\odot {\rm (K km s^{-1} pc^2)^{-1}}$). find that properties IR QSOs, such as mass, star formation efficiency ($L_{\rm FIR}/L^\prime_{\rm CO}$) and (1-0) line widths, are indistinguishable from those local galaxies...
We study the properties of infrared-selected QSOs (IR QSOs), optically-selected (PG QSOs) and Narrow Line Seyfert 1 galaxies (NLS1s). compare their from infrared to optical examine various correlations among black hole mass, accretion rate, star formation rate luminosities. find that excess in IR is mostly far infrared, spectral indices suggest emission low temperature dust heated by starbursts rather than AGNs. The therefore a useful criterion separate relative contributions further tight...
We report X-ray observations of the field containing ultraluminous IRAS galaxy Mrk 273. The data were obtained using Advanced CCD Imaging Spectrometer S3 instrument on board Chandra. high-resolution image for first time reveals a compact hard nucleus in Its position is coincident with northern identified optical, infrared, and radio molecular CO maps. energy distribution well described by heavily obscured active galactic (AGN) spectrum an absorbed power law plus narrow Fe Kα emission line at...
Spectroscopic observations of a sample 73 very luminous IRAS galaxies ( for ,) from the 2 Jy redshift survey catalogue were carried out using 2.16 m telescope at Beijing Astronomical Observatory. The observational data, including optical images (extracted Digital Sky Survey) and spectra these galaxies, are presented in Paper I (Wu et al. 1998). In this paper, we give spectral morphological classifications (VLIRGs). We show that about 60% VLIRGs exhibit AGN-like (Seyfert 1s, Seyfert 2s,...
We study the morphology and star formation properties of 159 local luminous infrared galaxy (LIRG) using multi-color images from Data Release 2 (DR2) Sloan Digital Sky Survey (SDSS). The LIRGs are selected a cross-correlation analysis between IRAS survey SDSS. They all brighter than 15.9 mag in r-band below redshift ~ 0.1, so can be reliably classified morphologically. find that fractions interacting/merging spiral galaxies 48% 40% respectively. Our results complement confirm decline...
We analyse mid-infrared (MIR) spectroscopic properties for 19 ultra-luminous infrared quasars (IR QSOs) in the local Universe based on spectra from IR Spectrograph board Spitzer Space Telescope. The MIR of QSOs are compared with those optically selected Palomar-Green (PG and galaxies (ULIRGs). average spectral features ∼5 to 30 μm, including slopes, 6.2 μm polycyclic aromatic hydrocarbon (PAH) emission strengths [Ne ii] 12.81 luminosities QSOs, differ PG QSOs. In contrast, ULIRGs have...
We perform photometric measurements on a large HST snapshot imaging survey sample of 97 ultraluminous infrared galaxies (ULIRGs). select putative nuclei from bright clumps in all the targets, mainly based quantitative criterion I-band luminosity as well global and local morphological information. All sources are then classified into three categories with multiple, double, single nucleus/nuclei. The resultant fractions nucleus/nuclei ULIRGs 18%, 39%, 43%, respectively. This supports multiple...
We performed spectroscopic observations for a large infrared quasi-stellar object (QSO) sample with total of 25 objects. The was compiled from the QDOT redshift survey, 1 Jy ultraluminous IRAS galaxy and obtained by cross-correlation study Point-Source Catalogue ROSAT All-Sky Survey Catalogue. Statistical analyses optical spectra show that vast majority QSOs have narrow permitted emission lines (with FWHM Hβ less than 4000 km s-1) more 60% them are luminous narrow-line Seyfert galaxies. Two...
We report the optical identifications of two X-ray-luminous point sources in spiral galaxy NGC 4565 based on archive data Chandra and Hubble Space Telescope. The central X-ray source, RX J1236.3+2559, is found to be nucleus with an luminosity LX ≈ 4.3 × 1039 ergs s-1. show that its multiband properties are consistent being a low-luminosity active galactic nucleus. A faint counterpart B 25.1 I 24.0 was identified for off-nucleus J1236.2+2558. Its extinction-corrected magnitude estimated 24.5....
We revisit the shapes of isophotes for elliptical (E) and lenticular (S0) galaxies by studying 847 nearby early-type selected from Sloan Digital Sky Survey (SDSS) Data Release 4 (DR4) with velocity dispersions above 200 km s−1. The iraf task ellipse was used to derive deviations pure ellipses (Fourier coefficients a3/a a4/a), position angles (PAs) ellipticities as a function radius. show statistical distributions a4/a parameters dispersion, magnitude colour. parameter is correlated...
We perform photometric analyses of a bright early-type galaxy sample with 2949 galaxies (Mr < −22.5 mag) in the redshift range 0.05–0.15, drawn from Sloan Digital Sky Survey (SDSS) DR7 morphological classification Galaxy Zoo 1. measure Petrosian and isophotal magnitudes, as well corresponding half-light radius for each galaxy. find that brightest −23 mag), our magnitudes to 25 mag arcsec−2 1% sky brightness are on average 0.16 mag, 0.20 0.26 brighter than SDSS values, respectively. In first...
ABSTRACT With the aim of exploring fast evolutionary path from blue cloud star-forming galaxies to red sequence quiescent in local universe, we select a advanced merging infrared luminous and ultraluminous galaxy (adv-merger (U)LIRGs) sample perform careful dust extinction corrections investigate their positions star formation rate– M * , u − r NUV color–mass diagrams. The consists 89 (U)LIRGs at late merger stage, obtained cross-correlating Infrared Astronomical Satellite Point Source...
This paper presents the results of spectral observations for largest complete sample very luminous IRAS galaxies obtained to date. The consists those 73 objects which log (L_IR/L_sun) => 11.5 (H0=50 km/s/Mpc, q0=0.5) and mag =< 15.5, was extracted from 2 Jy redshift catalog. All spectra were using 2.16m telescope Beijing Astronomical Observatory during years 1994-1996. A total 123 galaxy with ranges 4400A 7100A 3500A 8100A at resolutions 11.2A 9.3A respectively. In addition galaxies, we also...
We study the properties of hot gaseous halos in 10 nearby ultraluminous IRAS galaxies observed with ACIS instrument on board Chandra. For all sample galaxies, diffuse soft X-ray emissions are found within ~10 kpc central region; their spectra well fitted by a MEKAL model plus emission lines from α-elements and other ions. The temperature gas is about 0.7 keV metallicity 1 Z☉. Outside region, extended for 9 out infrared (ULIRGs). Most these can be 0.6 low (Z ~ 0.1 Z☉). discuss implications...
We have made a serendipitous discovery of massive (∼5 × 1011 M☉) cD galaxy at z = 1.096 in candidate-rich cluster the Hubble Ultra Deep Field (HUDF) area GOODS-South. This brightest (BCG) is most distant confirmed to date. Ultra-deep HST/WFC3 images reveal an extended envelope starting from ∼10 kpc and reaching ∼70 radius along semimajor axis. The spectral energy distributions indicate that both its inner component outer are composed old, passively evolving (specific star formation rate...
We analyse the cross-correlation of IRAS galaxies (QDOT sample) with Abell clusters and radio galaxies, using redshift samples. The large uniformly selected QDOT sample enables us to determine reliably functions on scales, independent possible non-uniformities in cluster catalogues. results give accurate information shape power spectrum galaxy density field how different objects trace large-scale structure Universe. Our statistical analysis is based average two-point function...
We report the discovery of brightest X-ray source hosted by a faint (M_B=-16) dwarf galaxy in immediate vicinity ultraluminous IRAS merging Mrk 273. The galaxy, 1.3 arcmin away from 273, is at tip northeast plume Its spectrum exhibits strong [OIII], Halpha, [NII] emission lines, which establish redshift $z=0.0376$, same as that line ratios are typical Seyfert galaxies. consistent with point-like coincident center galaxy. intrinsic luminosity, 6.3x10^{41} ergs, 0.1--2.4 keV energy range,...
We investigate the morphological segregation of galaxies on large scales, using complete redshift samples and statistical methods sensitive to population change in low-density regions galaxy distribution. Our correlation analysis shows that elliptical S0 are significantly more correlated than spiral scales |$\leq 15\,{h}^{-1}$| Mpc. The analysis, for excluding belonging clusters defined by given density contrasts, fraction field decreases monotonically as contrast changes from high values ~ 1.