scholarly journals Spectroscopic Properties of Void Galaxies in the Sloan Digital Sky Survey

2005 ◽  
Vol 624 (2) ◽  
pp. 571-585 ◽  
Author(s):  
Randall R. Rojas ◽  
Michael S. Vogeley ◽  
Fiona Hoyle ◽  
Jon Brinkmann
Keyword(s):  
Spectroscopic Properties ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Void Galaxies

The Mass Function of Void Galaxies in the Sloan Digital Sky Survey Data Release 2

2005 ◽  
Vol 621 (2) ◽  
pp. 643-650 ◽  
Author(s):  
David M. Goldberg ◽  
Timothy D. Jones ◽  
Fiona Hoyle ◽  
Randall R. Rojas ◽  
Michael S. Vogeley ◽  
...  
Keyword(s):  
Survey Data ◽  
Mass Function ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Void Galaxies ◽  
Data Release

scholarly journals The Luminosity Function of Void Galaxies in the Sloan Digital Sky Survey

2005 ◽  
Vol 620 (2) ◽  
pp. 618-628 ◽  
Author(s):  
Fiona Hoyle ◽  
Randall R. Rojas ◽  
Michael S. Vogeley ◽  
Jon Brinkmann
Keyword(s):  
Luminosity Function ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Void Galaxies

scholarly journals The properties of inside-out assembled galaxies at z < 0.1

2019 ◽  
Vol 15 (S356) ◽  
pp. 358-360
Author(s):  
Dejene Zewdie ◽  
Mirjana Pović ◽  
Manuel Aravena ◽  
Roberto J. Assef ◽  
Asrate Gaulle
Keyword(s):  
Main Sequence ◽  
Spectroscopic Properties ◽  
Stellar Mass ◽  
Sloan Digital Sky Survey ◽  
Morphological Transformation ◽  
Star Forming ◽  
Sky Survey ◽  
Stellar Masses ◽  
Inside Out ◽  
Red Sequence

AbstractIn this work, we study the properties of galaxies that are showing the inside-out assembly (which we call inside-out assembled galaxies; IOAGs), with the main aim to understand better their properties and morphological transformation. We analysed a sample of galaxies from the Sloan Digital Sky Survey (SDSS) Data Release 8 (DR8), with stellar masses in the range log M* = 10.73 – 11.03 M⊙ at at z < 0.1, and analyze their location in the stellar mass-SFR and the color-stellar mass diagram. We found that IOAGs have different spectroscopic properties, most of them being classified either as AGN or composite. We found that the majority of our sources are located below the main sequence of star formation in the SFR-stellar mass diagram, and in the green valley or red sequence in the color-stellar mass diagram. We argue that IOAGs seem to correspond to the transition area where the galaxies are moving from star-forming to quiescent, and from the blue cloud to the red sequence and/or to recently quenched galaxies.

scholarly journals Spectroscopic Properties of Cool Stars in the Sloan Digital Sky Survey: An Analysis of Magnetic Activity and a Search for Subdwarfs

2004 ◽  
Vol 128 (1) ◽  
pp. 426-436 ◽  
Author(s):  
Andrew A. West ◽  
Suzanne L. Hawley ◽  
Lucianne M. Walkowicz ◽  
Kevin R. Covey ◽  
Nicole M. Silvestri ◽  
...  
Keyword(s):  
Spectroscopic Properties ◽  
Magnetic Activity ◽  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Cool Stars

scholarly journals Photometric Properties of Void Galaxies in the Sloan Digital Sky Survey

2004 ◽  
Vol 617 (1) ◽  
pp. 50-63 ◽  
Author(s):  
Randall R. Rojas ◽  
Michael S. Vogeley ◽  
Fiona Hoyle ◽  
Jon Brinkmann
Keyword(s):  
Sloan Digital Sky Survey ◽  
Sky Survey ◽  
Void Galaxies

scholarly journals Active Galactic Nuclei Abundance in Cosmic Voids

2021 ◽  
Vol 922 (1) ◽  
pp. L17
Author(s):  
Hora D. Mishra ◽  
Xinyu Dai ◽  
Eduardo Guerras
Keyword(s):  
Active Galactic Nuclei ◽  
Galactic Nuclei ◽  
Sloan Digital Sky Survey ◽  
Void Size ◽  
Galaxy Interactions ◽  
Sky Survey ◽  
Void Galaxies ◽  
Ram Pressure ◽  
Cosmic Voids ◽  
Environmental Dependence

Abstract The abundance of active galactic nuclei (AGN) in cosmic voids is relatively unexplored in the literature, but can potentially provide new constraints on the environmental dependence of AGN activity and the AGN-host coevolution. We investigated AGN fractions in one of the largest samples of optically selected cosmic voids from Sloan Digital Sky Survey Data Release 12 for redshift range 0.2–0.7 for moderately bright and bright AGN. We separated inner and outer void regions based on the void size, given by its effective void radius. We classified galaxies at a distance <0.6 R eff as inner void members and galaxies in the interval 0.6 < R/R eff < 1.3 as outer void galaxies. We found higher average fractions in the inner voids (4.9 ± 0.7)% than for their outer counterparts (3.1 ± 0.1)% at z > 0.42, which clearly indicates an environmental dependence. This conclusion was confirmed upon further separating the data in narrower void-centric distance bins and measured a significant decrease in AGN activity from inner to outer voids for z > 0.42. At low redshifts (z < 0.42), we find very weak dependence on the environment for the inner and outer regions for two out of three bins. We argue that the higher fraction in low-density regions close to void centers relative to their outer counterparts observed in the two higher-redshift bins suggests that more efficient galaxy interactions may occur at a one-to-one level in voids that may be suppressed in denser environments due to higher velocity dispersions. It could also indicate less prominent ram pressure stripping in voids or some intrinsic host or void environment properties.

Intrinsic Characteristics of Quasars Redshifts

2014 ◽  
Vol 4 (3) ◽  
pp. 655-661
Author(s):  
Waleed Elsanhoury
Keyword(s):  
Absolute Magnitude ◽  
Sloan Digital Sky Survey ◽  
Strong Correlations ◽  
Sky Survey

Using Sloan Digital Sky Survey SDSS catalog, some intrinsic characteristics of Quasars (10,000 points) are developed of these are the strong correlations between redshifts and other parameters, e.g. combined magnitude, luminosity, and absolute magnitude .Moreover ,the Karlsson peak of our sample is also computed.

scholarly journals Characterizing the abundance, properties, and kinematics of the cool circumgalactic medium of galaxies in absorption with SDSS DR16

2021 ◽  
Vol 504 (1) ◽  
pp. 65-88
Author(s):  
Abhijeet Anand ◽  
Dylan Nelson ◽  
Guinevere Kauffmann
Keyword(s):  
Formation Rate ◽  
Sloan Digital Sky Survey ◽  
Gas Absorption ◽  
Dark Matter Halo ◽  
Star Forming ◽  
Sky Survey ◽  
Optical Continuum ◽  
Circumgalactic Medium ◽  
Emission Line Galaxies ◽  
Red Galaxies

ABSTRACT In order to study the circumgalactic medium (CGM) of galaxies we develop an automated pipeline to estimate the optical continuum of quasars and detect intervening metal absorption line systems with a matched kernel convolution technique and adaptive S/N criteria. We process ∼ one million quasars in the latest Data Release 16 (DR16) of the Sloan Digital Sky Survey (SDSS) and compile a large sample of ∼ 160 000 Mg ii absorbers, together with ∼ 70 000 Fe ii systems, in the redshift range 0.35 &lt; zabs &lt; 2.3. Combining these with the SDSS DR16 spectroscopy of ∼1.1 million luminous red galaxies (LRGs) and ∼200 000 emission line galaxies (ELGs), we investigate the nature of cold gas absorption at 0.5 &lt; z &lt; 1. These large samples allow us to characterize the scale dependence of Mg ii with greater accuracy than in previous work. We find that there is a strong enhancement of Mg ii absorption within ∼50 kpc of ELGs, and the covering fraction within 0.5rvir of ELGs is 2–5 times higher than for LRGs. Beyond 50 kpc, there is a sharp decline in Mg ii for both kinds of galaxies, indicating a transition to the regime where the CGM is tightly linked with the dark matter halo. The Mg ii-covering fraction correlates strongly with stellar mass for LRGs, but weakly for ELGs, where covering fractions increase with star formation rate. Our analysis implies that cool circumgalactic gas has a different physical origin for star-forming versus quiescent galaxies.

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