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Title: Newly discovered Ca  ii absorbers in the early Universe: statistics, element abundances, and dust

Journal Article · · Monthly Notices of the Royal Astronomical Society
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ABSTRACT We report discoveries of 165 new quasar Ca ii absorbers from the Sloan Digital Sky Survey (SDSS) Data Releases 7 and 12. Our ca ii rest-frame equivalent width distribution supports the weak and strong subpopulations, split at $${W}^{\lambda 3934}_{0}=0.7$$ Å. Comparison of both populations’ dust depletion shows clear consistency for weak absorber association with halo-type gas in the Milky Way (MW), while strong absorbers have environments consistent with halo and disc-type gas. We probed our high-redshift Ca ii absorbers for 2175 Å dust bumps, discovering 12 2175 Å dust absorbers (2DAs). This clearly shows that some Ca ii absorbers follow the Large Magellanic Cloud (LMC) extinction law rather than the Small Magellanic Cloud extinction law. About 33 per cent of our strong Ca ii absorbers exhibit the 2175 Å dust bump, while only 6 per cent of weak Ca ii absorbers show this bump. 2DA detection further supports the theory that strong Ca ii absorbers are associated with disc components and are dustier than the weak population. Comparing average Ca ii absorber dust depletion patterns to that of Damped Ly α absorbers (DLAs), Mg ii absorbers, and 2DAs shows that Ca ii absorbers generally have environments with more dust than DLAs and Mg ii absorbers, but less dust than 2DAs. Comparing 2175 Å dust bump strengths from different samples and also the MW and LMC, the bump strength appears to grow stronger as the redshift decreases, indicating dust growth and the global chemical enrichment of galaxies in the Universe over time.

Sponsoring Organization:
USDOE
OSTI ID:
1903403
Journal Information:
Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Vol. 518 Journal Issue: 4; ISSN 0035-8711
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United Kingdom
Language:
English

References (45)

Evidence for dust reddening in damped Ly  absorbers identified through Ca II (H&K) absorption journal July 2005
TOWARD DETECTING THE 2175 Å DUST FEATURE ASSOCIATED WITH STRONG HIGH-REDSHIFT Mg II ABSORPTION LINES journal April 2011
Ca ii absorbers in the Sloan Digital Sky Survey: element abundances and dust journal July 2015
Three intervening galaxy absorbers towards GRB 060418: faint and dusty? journal October 2006
INTERSTELLAR ABUNDANCES FROM ABSORPTION-LINE OBSERVATIONS WITH THE HUBBLE SPACE TELESCOPE journal September 1996
THE JHU-SDSS METAL ABSORPTION LINE CATALOG: REDSHIFT EVOLUTION AND PROPERTIES OF Mg II ABSORBERS journal June 2013
The ESO UVES advanced data products quasar sample – VI. Sub-damped Lyman α metallicity measurements and the circumgalactic medium journal March 2016
A Quantitative Comparison of the Small Magellanic Cloud, Large Magellanic Cloud, and Milky Way Ultraviolet to Near‐Infrared Extinction Curves journal September 2003
Selecting damped Lyman   systems through Ca II absorption -- I. Dust depletions and reddening at z  1 journal March 2006
Maps of Dust Infrared Emission for Use in Estimation of Reddening and Cosmic Microwave Background Radiation Foregrounds journal June 1998
Damped Lyman-alpha absorption by disk galaxies with large redshifts. I - The Lick survey journal June 1986
The extinction curves of star-forming regions fromz = 0.1 to 6.7 using GRB afterglow spectroscopy journal August 2011
An analysis of the shapes of ultraviolet extinction curves. III - an atlas of ultraviolet extinction curves journal January 1990
Detection of the 2175 A Extinction Feature atz= 0.83 journal August 2002
Dust and Diffuse Interstellar Bands in the z a = 0.524 Absorption System toward AO 0235+164 journal October 2004
Cold gas and a Milky Way-type 2175-Å bump in a metal-rich and highly depleted absorption system journal October 2015
The Chemical Composition of the Sun journal September 2009
The Diffuse Interstellar Clouds toward 23 Orionis journal October 1999
The Eleventh and Twelfth data Releases of the Sloan Digital sky Survey: Final data from Sdss-Iii journal July 2015
Dust depletion of Ca and Ti in QSO absorption-line systems journal June 2016
emcee : The MCMC Hammer
  • Foreman-Mackey, Daniel; Hogg, David W.; Lang, Dustin
  • Publications of the Astronomical Society of the Pacific, Vol. 125, Issue 925 https://doi.org/10.1086/670067
journal March 2013
Identifying Mg ii narrow absorption lines with deep learning journal May 2019
Interstellar Dust Grains journal September 2003
Measurements of Ca ii absorption, metals and dust in a sample ofz≃ 1 DLAs and subDLAs★ journal October 2008
On the Interaction of Radiation from Distant Sources with the Intervening Medium. journal November 1965
Quasar 2175 Å dust absorbers – I. Metallicity, depletion pattern and kinematics journal August 2017
The host galaxies of strong Ca II quasar absorption systems at z < 0.5 journal August 2007
Neutral atomic-carbon quasar absorption-line systems at z > 1.5 : Sample selection, H i content, reddening, and 2175 Å extinction feature⋆ journal July 2015
The Seventh data Release of the Sloan Digital sky Survey journal May 2009
Multiple origins for the DLA at zabs = 0.313 toward PKS 1127–145 indicated by a complex dust depletion pattern of Ca, Ti, and Mn journal January 2018
Discovering Ca ii absorption lines with a neural network journal October 2022
Atomic data for resonance absorption lines. I - Wavelengths longward of the Lyman limit journal September 1991
On the dust properties of high-redshift molecular clouds and the connection to the 2175 Å extinction bump journal April 2019
Quasar 2175 Å dust absorbers – II. Correlation analysis and relationship with other absorption line systems journal December 2017
Metal enrichment, dust, and star formation in galaxies at high redshifts. I - The Z = 2.3091 absorber toward PHL 957 journal January 1990
DUST EXTINCTION IN HIGH-zGALAXIES WITH GAMMA-RAY BURST AFTERGLOW SPECTROSCOPY: THE 2175 Å FEATURE ATz= 2.45 journal May 2009
The neutral gas extent of galaxies as derived from weak intervening Ca ii absorbers journal February 2011
ON the Measurement and Interpretation of Absorption Features in the Spectrum of the Quasi-Stellar Object 3c 191 journal April 1966
Anomalously Steep Reddening law in Quasars: an Exceptional Example Observed in iras 14026+4341 journal May 2013
Physics of the Interstellar and Intergalactic Medium book December 2011
Detections of the 2175 A Dust Feature at 1.4 ≲  z  ≲ 1.5 from the Sloan Digital Sky Survey journal July 2004
Ca舁ii absorbers in the Sloan Digital Sky Survey: statistics journal August 2014
seaborn: statistical data visualization journal April 2021
Average extinction curves and relative abundances for quasi-stellar object absorption-line systems at 1 ≤zabs < 2 journal April 2006
An Analysis of the Shapes of Interstellar Extinction Curves. V. The IR‐through‐UV Curve Morphology journal July 2007

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