scholarly journals Chandra Early-Type Galaxy Atlas

2018 ◽  
Vol 14 (S342) ◽  
pp. 242-243
Author(s):  
Dong-Woo Kim ◽  
Craig Anderson ◽  
Douglas Burke ◽  
Raffaele D’Abrusco ◽  
Giuseppina Fabbiano ◽  
...  
Keyword(s):  
Surface Brightness ◽  
Structural Features ◽  
Early Type ◽  
Evolutionary Mechanisms ◽  
Hot Gas ◽  
Spatially Resolved ◽  
Data Products ◽  
Formation And Evolution ◽  
High Level ◽  
Early Type Galaxy

AbstractThe hot ISM in early-type galaxies (ETGs) plays a crucial role in understanding their formation and evolution. The structural features of the hot gas identified by Chandra observations point to key evolutionary mechanisms, (e.g., kim12). In our Chandra Galaxy Atlas (CGA) project, taking full advantage of the Chandra capabilities, we systematically analyzed the archival Chandra data of 72 ETGs and produced uniform data products of the hot gas properties. The main data products include spatially resolved 2D spectral maps of the hot gas from individual galaxies. We emphasize that new features can be identified in the spectral maps which are not easily visible in the surface brightness maps. The high-level images can be viewed at the dedicated CGA website, and the CGA data products can be downloaded to compare with other wavelength data and to perform user-specific analyses. Utilizing our data products, we will further address focused science topics.

scholarly journals Spatially Resolved Stellar Populations and Kinematics with KCWI: Probing the Assembly History of the Massive Early-type Galaxy NGC 1407

2019 ◽  
Vol 878 (2) ◽  
pp. 129 ◽  
Author(s):  
Anna Ferré-Mateu ◽  
Duncan A. Forbes ◽  
Richard M. McDermid ◽  
Aaron J. Romanowsky ◽  
Jean P. Brodie
Keyword(s):  
Stellar Populations ◽  
Early Type ◽  
Spatially Resolved ◽  
History Of ◽  
Early Type Galaxy

scholarly journals UV-IR color profiles of the outer regions of 2K nearby S4G galaxies

2016 ◽  
Vol 11 (S321) ◽  
pp. 257-259
Author(s):  
Alexandre Y. K. Bouquin ◽  
Armando Gil de Paz
Keyword(s):  
Surface Brightness ◽  
Large Fraction ◽  
Early Type ◽  
Late Type ◽  
Quenching Mechanism ◽  
Star Forming ◽  
Spatially Resolved ◽  
Ram Pressure ◽  
Late Type Star ◽  
Radial Evolution

AbstractWe present our new, spatially-resolved, photometry in FUV and NUV from images obtained by GALEX, and IRAC1 (3.6 μm) photometry obtained by the Spitzer Space Telescope. We analyzed the surface brightness profiles μFUV, μNUV, μ[3.6], as well as the radial evolution of the (FUV-NUV), (FUV - [3.6]), and (NUV - [3.6]) colors in the Spitzer Survey of Stellar Structures in Galaxies (S4G) galaxies (d < 40 Mpc) sample. We defined the GALEX Blue Sequence (GBS) and GALEX Red Sequence (GBR) from the (FUV - NUV) versus (NUV - [3.6]) color-color diagram, populated by late-type star forming galaxies and quiescent early-type galaxies respectively. While most disk becomes radially bluer for GBS galaxies, and stay constant for GRS galaxies, a large fraction ( > 50%) of intermediary GALEX Green Valley (GGV) galaxies’ outer disks are becoming redder. An outside-in quenching mechanism such as environmentally-related mechanisms such as starvation or ram-pressure-stripping could explain our results.

scholarly journals A rare example of low surface-brightness radio lobes in a gas-rich early-type galaxy: the story of NGC 3998

2016 ◽  
Vol 592 ◽  
pp. A94 ◽  
Author(s):  
Bradley S. Frank ◽  
Raffaella Morganti ◽  
Tom Oosterloo ◽  
Kristina Nyland ◽  
Paolo Serra
Keyword(s):  
Surface Brightness ◽  
Early Type ◽  
Low Surface Brightness ◽  
Early Type Galaxy

scholarly journals The first detection of ultra-diffuse galaxies in the Hydra I cluster from the VEGAS survey

2020 ◽  
Vol 642 ◽  
pp. A48
Author(s):  
E. Iodice ◽  
M. Cantiello ◽  
M. Hilker ◽  
M. Rejkuba ◽  
M. Arnaboldi ◽  
...  
Keyword(s):  
Surface Brightness ◽  
Total Population ◽  
Matter Content ◽  
Early Type ◽  
Low Surface Brightness ◽  
Colour Distribution ◽  
Specific Frequency ◽  
Stellar Masses ◽  
Low Surface Brightness Galaxies ◽  
Early Type Galaxy

In this paper, we report the discovery of 27 low-surface brightness galaxies, of which 12 are candidates for ultra-diffuse galaxies (UDG) in the Hydra I cluster, based on deep observations taken as part of the VST Early-type Galaxy Survey (VEGAS). This first sample of UDG candidates in the Hydra I cluster represents an important step in our project that aims to enlarge the number of confirmed UDGs and, through study of statistically relevant samples, constrain the nature and formation of UDGs. This study presents the main properties of this class of galaxies in the Hydra I cluster. For all UDGs, we analysed the light and colour distribution, and we provide a census of the globular cluster (GC) systems around them. Given the limitations of a reliable GC selection based on two relatively close optical bands only, we find that half of the UDG candidates have a total GC population consistent with zero. Of the other half, two galaxies have a total population larger than zero at 2σ level. We estimate the stellar mass, the total number of GCs, and the GC specific frequency (SN). Most of the candidates span a range of stellar masses of 107 − 108 M⊙. Based on the GC population of these newly discovered UDGs, we conclude that most of these galaxies have a standard or low dark matter content, with a halo mass of ≤1010 M⊙.

scholarly journals Early-type galaxy distances from the Fundamental Plane and surface brightness fluctuations

2002 ◽  
Vol 330 (2) ◽  
pp. 443-457 ◽  
Author(s):  
John P. Blakeslee ◽  
John R. Lucey ◽  
John L. Tonry ◽  
Michael J. Hudson ◽  
Vijay K. Narayanan ◽  
...  
Keyword(s):  
Surface Brightness ◽  
Early Type ◽  
Fundamental Plane ◽  
Surface Brightness Fluctuations ◽  
Early Type Galaxy

scholarly journals VEGAS: a VST Early-type GAlaxy Survey

2020 ◽  
Vol 635 ◽  
pp. A3 ◽  
Author(s):  
Enrichetta Iodice ◽  
Marilena Spavone ◽  
Arianna Cattapan ◽  
Elena Bannikova ◽  
Duncan A. Forbes ◽  
...  
Keyword(s):  
Surface Brightness ◽  
Major Axis ◽  
Integration Time ◽  
High Angular Resolution ◽  
Evolutionary Stage ◽  
Wide Field ◽  
Early Type ◽  
Semi Major Axis ◽  
Galaxy Groups ◽  
Early Type Galaxy

Context. This paper is based on the multi-band VST Early-type GAlaxy Survey (VEGAS) with the VLT Survey Telescope (VST). We present new deep photometry of the IC 1459 group in g and r band. Aims. The main goal of this work is to investigate the photometric properties of the IC 1459 group, and to compare our results with those obtained for other galaxy groups studied in VEGAS, in order to provide an initial view of the variation of their properties as a function of the evolution of the system. Methods. For all galaxies in the IC 1459 group, we fit isophotes and extract the azimuthally averaged surface-brightness profiles, the position angle, and ellipticity profiles as a function of the semi-major axis. We also extract the average colour profile. In each band, we estimate the total magnitude, effective radius, mean colour, and total stellar mass for each galaxy in the group. We then look at the structure of the brightest galaxies and the faint features in their outskirts, considering also the intragroup component. Results. The wide field of view, long integration time, high angular resolution, and arcsec-level seeing of OmegaCAM at VST allow us to map the light distribution of IC 1459 down to a surface brightness level of 29.26 mag arcsec−2 in g band and 28.85 mag arcsec−2 in r band, and out to 7−10Re, and to detect the optical counterpart of HI gas around IC 1459. We also carry out an in-depth exploration of three low-density environments and provide information to understand how galaxy and group properties change with the group evolution stage. Conclusions. Good agreement is found between our results and predictions of numerical simulations regarding the structural properties of the brightest galaxies of the groups. We suggest that the structure of the outer envelope of he brightest cluster galaxies (i.e. the signatures of past mergers and tidal interactions), the intra-group light, and the HI amount and distribution may be used as indicators of the evolutionary stage and mass assembly of galaxy groups.

scholarly journals A tidal tale: detection of several stellar streams in the environment of NGC 1052

2019 ◽  
Vol 624 ◽  
pp. L6 ◽  
Author(s):  
Oliver Müller ◽  
R. Michael Rich ◽  
Javier Román ◽  
Mustafa K. Yıldız ◽  
Michal Bílek ◽  
...  
Keyword(s):  
Dark Matter ◽  
Galaxy Formation ◽  
Surface Brightness ◽  
Dwarf Galaxy ◽  
Early Type ◽  
Tidal Interaction ◽  
Low Surface Brightness ◽  
Stellar Streams ◽  
Early Type Galaxy ◽  
Band Image

The possible existence of two dark-matter-free galaxies (NGC 1052-DF2 and NGC 1052-DF4) in the field of the early-type galaxy NGC 1052 presents a challenge to theories of dwarf galaxy formation according to the current cosmological paradigm. We carried out a search for signatures of past interactions connected to the putative hosts of NGC 1052-DF2 and NGC 1052-DF4 using a very deep L-band image obtained with the 0.7 m Jeanne Rich telescope that reach a surface brightness limit of 28.5 mag arcsec−2 in the r band. We found several low-surface brightness features, possibly consistent with an ongoing merger history in this group. We find a tidal interaction between NGC 1052 and NGC 1047, confirming a physical association. Furthermore, we find a stellar loop around NGC 1052 in the direction of NGC 1042 and a stellar stream pointing in the direction of NGC 1052-DF2, but they are not directly connected. We find no evidence for a recent tidal interaction for NGC 1052-DF2 and NGC 1052-DF4. No LSB features have been uncovered around the spiral galaxy NGC 1042, which leaves the association (physical or projected) between NGC 1052 and NGC 1042 ambiguous, although they have similar radial velocities. Their association will only be established when accurate distances to both objects have been measured.

scholarly journals Evolution in the Cluster Early‐Type Galaxy Size–Surface Brightness Relation atz ≃1

2005 ◽  
Vol 626 (2) ◽  
pp. 809-822 ◽  
Author(s):  
B. P. Holden ◽  
J. P. Blakeslee ◽  
M. Postman ◽  
G. D. Illingworth ◽  
R. Demarco ◽  
...  
Keyword(s):  
Surface Brightness ◽  
Early Type ◽  
Early Type Galaxy

Stellar Metallicities and Type Ia Supernova Rates in the Early‐Type Galaxy NGC 5846 fromROSATandASCAObservations

1999 ◽  
Vol 514 (2) ◽  
pp. 844-855 ◽  
Author(s):  
A. Finoguenov ◽  
C. Jones ◽  
W. Forman ◽  
L. David
Keyword(s):  
Early Type ◽  
Type Ia Supernova ◽  
Type Ia ◽  
Early Type Galaxy

scholarly journals Survey of Gravitationally Lensed Objects in HSC Imaging (SuGOHI) – VII. Discovery and confirmation of three strongly lensed quasars†

2021 ◽  
Vol 502 (1) ◽  
pp. 1487-1493
Author(s):  
Anton T Jaelani ◽  
Cristian E Rusu ◽  
Issha Kayo ◽  
Anupreeta More ◽  
Alessandro Sonnenfeld ◽  
...  
Keyword(s):  
Spectroscopic Data ◽  
Point Sources ◽  
Sloan Digital Sky Survey ◽  
Early Type ◽  
Blue Point ◽  
X Ray ◽  
Quasar Spectra ◽  
Strategic Program ◽  
Early Type Galaxy

ABSTRACT We present spectroscopic confirmation of three new two-image gravitationally lensed quasars, compiled from existing strong lens and X-ray catalogues. Images of HSC J091843.27–022007.5 show a red galaxy with two blue point sources at either side, separated by 2.26 arcsec. This system has a source and a lens redshifts zs = 0.804 and zℓ = 0.459, respectively, as obtained by our follow-up spectroscopic data. CXCO J100201.50+020330.0 shows two point sources separated by 0.85 arcsec on either side of an early-type galaxy. The follow-up spectroscopic data confirm the fainter quasar has the same redshift with the brighter quasar from the Sloan Digital Sky Survey (SDSS) fiber spectrum at zs = 2.016. The deflecting foreground galaxy is a typical early-type galaxy at a redshift of zℓ = 0.439. SDSS J135944.21+012809.8 has two point sources with quasar spectra at the same redshift zs = 1.096, separated by 1.05 arcsec, and fits to the HSC images confirm the presence of a galaxy between these. These discoveries demonstrate the power of the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP)’s deep imaging and wide sky coverage. Combined with existing X-ray source catalogues and follow-up spectroscopy, the HSC-SSP provides us unique opportunities to find multiple-image quasars lensed by a foreground galaxy.

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