2024RNAAS...8..172L

Query : 2024RNAAS...8..172L

2024RNAAS...8..172L - Research Notes of the AAS, 8, 172 (2024/July-0)

Detecting Novel Damped Lyα Absorbers in the Intergalactic Medium.

LEE K.C.

Abstract (from CDS):

Damped Lyα (DLA) absorbers are a class of quasar absorption line systems that can be used to trace hydrogen evolution and study gas, composition, kinematics, and stellar formation in galaxies or the intergalactic medium in the early universe. In this study, the number of DLA absorbers found with a deep learning algorithm is augmented using metal Mg II absorbers as signposts. The artificial training data was generated by inserting synthetic absorption lines into spectra. Using previously identified DLAs as a test set, the model returned a 94.6% accuracy score and 1197 new DLA absorbers, which nearly doubles the previously known number of samples within the search catalog. Additionally, the column density and Doppler broadening are measured on the newly found DLA absorbers through Voigt profile fitting.

Journal keyword(s): Interstellar absorption - Damped Lyman-alpha systems - Intergalactic medium - Quasar absorption line spectroscopy

Simbad objects: 1

Full paper

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	SDSS J003001.62+275458.8	QSO	00 30 01.6189158672	+27 54 58.837216716						~	9	0

Query : 2024RNAAS...8..172L

Basic data :

SDSS J003001.62+275458.8 -- Quasar

QSO (2017A&A), Opt (SDSS,PSO), * (Gaia), Rad (ILT), MIR (WISEA)

00 30 01.6189158672 +27 54 58.837216716 (Optical) [ 0.1704 0.0923 90 ] A 2020yCat.1350....0G

00 27 23.4610594350 +27 38 24.566898083 [ 0.1704 0.0923 90 ]

117.1764406479060 -34.7160146296954 [ 0.1704 0.0923 90 ]

0.057 0.037 [0.171 0.146 90] A 2020yCat.1350....0G

V(km/s) 266059 [36] / z(spectroscopic) 3.09564 [0.00012] / cz 928049.5 [36.0] (Opt) C 2015ApJS..219...12A

0.0034 [0.2784] A 2018yCat.1345....0G

G 18.129507 [0.003165] C 2020yCat.1350....0G

u (AB) 19.7783 [0.0558] C 2020ApJS..250....8L

g (AB) 18.5306 [0.0215] C 2020ApJS..250....8L

r (AB) 18.2168 [0.0206] C 2020ApJS..250....8L

i (AB) 17.9806 [0.0142] C 2020ApJS..250....8L

z (AB) 17.9532 [0.0431] C 2020ApJS..250....8L

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`SDSS J003001.62+275458.8`	`PSO J007.5067+27.9163`	`Gaia DR2 2856315876481882112`
`ILT J003001.60+275459.1`	`WISEA J003001.62+275458.9`	`Gaia DR3 2856315876481882112`

References (9 between 1850 and 2026) (Total 9)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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External archives :

Data at NED - NASA/IPAC Extragalactic Database : SDSS J003001.62+275458.8

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SDSS J003001.62+275458.8 WISEA J003001.62+275458.9 Gaia DR2 2856315876481882112 Gaia DR3 2856315876481882112

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