2005A&A...429..477C


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.08CET02:27:20

2005A&A...429..477C - Astronomy and Astrophysics, volume 429, 477-487 (2005/1-2)

Abundances and kinematics of a candidate sub-damped Lymanα galaxy toward PHL 1226.

CHRISTENSEN L., SCHULTE-LADBECK R.E., SANCHEZ S.F., BECKER T., JAHNKE K., KELZ A., ROTH M.M. and WISOTZKI L.

Abstract (from CDS):

The spectrum of the quasar PHL 1226 is known to have a strong MgII and sub-damped Lymanα (sub-DLA) absorption line system with N(HI)=(5±2)x1019cm–2 at z=0.1602. Using integral field spectra from the Potsdam Multi Aperture Spectrophotometer (PMAS) we investigate a galaxy at an impact parameter of 6.4" which is most probably responsible for the absorption lines. A fainter galaxy at a similar redshift and a slightly larger distance from the QSO is known to exist, but we assume that the absorption is caused by the more nearby galaxy. From optical Balmer lines we estimate an intrinsic reddening consistent with 0, and a moderate star formation rate of 0.5M>/yr is inferred from the Hα luminosity. Using nebular emission line ratios we find a solar oxygen abundance 12+log(O/H)=8.7±0.1 and a solar nitrogen to oxygen abundance ratio log(N/O)=-1.0±0.2. This abundance is larger than those of all known sub-DLA systems derived from analyses of metal absorption lines in quasar spectra. On the other hand, the properties are compatible with the most metal rich galaxies responsible for strong MgII absorption systems. These two categories can be reconciled if we assume an abundance gradient similar to local galaxies. Under that assumption we predict abundances 12+log(O/H)=7.1 and log(N/O)=-1.9 for the sub-DLA cloud, which is similar to high redshift DLA and sub-DLA systems. We find evidence for a rotational velocity of ∼200km/s over a length of ∼7kpc. From the geometry and kinematics of the galaxy we estimate that the absorbing cloud does not belong to a rotating disk, but could originate in a rotating halo.

Abstract Copyright:

Journal keyword(s): galaxies: abundances - galaxies: kinematics and dynamics - quasars: individual: PHL 1226

Simbad objects: 5

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Number of rows : 5

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 2E 503 Sy1 01 54 27.9923794588 +04 48 18.159306691   17.01 16.91     ~ 85 0
2 2MASS J08533423+4349023 Sy1 08 53 34.2441726669 +43 49 02.333804505   17.15 16.91     ~ 92 0
3 QSO B1331+170 QSO 13 33 35.7828550018 +16 49 04.012528106   16.84 16.71 16.41   ~ 419 0
4 BD+28 4211 HS* 21 51 11.0220905905 +28 51 50.366090892 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 744 0
5 [BBK88] 3 G ~ ~     20.5     ~ 3 0

    Equat.    Gal    SGal    Ecl

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