2012ApJ...761..112M


Query : 2012ApJ...761..112M

2012ApJ...761..112M - Astrophys. J., 761, 112 (2012/December-3)

A survey of Mg II absorption at 2 < z < 6 with Magellan/FIRE. I. Sample and evolution of the Mg II frequency.

MATEJEK M.S. and SIMCOE R.A.

Abstract (from CDS):

We present initial results from the first systematic survey for Mg II quasar absorption lines at z > 2.5. Using infrared spectra of 46 high-redshift quasars, we discovered 111 Mg II systems over a path covering 1.9 < z < 6.3. Five systems have z > 5, with a maximum of z = 5.33–the most distant Mg II system now known. The comoving Mg II line density for weaker systems (Wr < 1.0 Å) is statistically consistent with no evolution from z = 0.4 to 5.5, while that for stronger systems increases three-fold until z ∼ 3 before declining again toward higher redshifts. The equivalent width distribution, which fits an exponential, reflects this evolution by flattening as z ⟶ 3 before steepening again. The rise and fall of the strong absorbers suggests a connection to the star formation rate density, as though they trace galactic outflows or other byproducts of star formation. The weaker systems' lack of evolution does not fit within this interpretation, but may be reproduced by extrapolating low redshift scaling relations between host galaxy luminosity and absorbing halo radius to earlier epochs. For the weak systems, luminosity-scaled models match the evolution better than similar models based on Mg II occupation of evolving cold dark matter halo masses, which greatly underpredict dN/dz at early times unless the absorption efficiency of small halos is significantly larger at early times. Taken together, these observations suggest that the general structure of Mg II-bearing halos was put into place early in the process of galaxy assembly. Except for a transient appearance of stronger systems near the peak epoch of cosmic star formation, the basic properties of Mg II absorbers have evolved fairly little even as the (presumably) associated galaxy population grew substantially in stellar mass and half-light radius.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: halos - galaxies: high-redshift - infrared: general - intergalactic medium - quasars: absorption lines

VizieR on-line data: <Available at CDS (J/ApJ/761/112): table1.dat table2.dat>

Simbad objects: 47

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Number of rows : 47
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 QSO J0003-2603 QSO 00 03 22.9531962024 -26 03 18.304471908   18 17.53     ~ 284 0
2 QSO J0006-6208 QSO 00 06 51.6236518800 -62 08 03.569781336     18.29     ~ 36 0
3 QSO J0018-3527 QSO 00 18 37.8849017856 -35 27 40.639849344     18.43     ~ 6 0
4 QSO B0103+00 QSO 01 06 19.2392271120 +00 48 23.369353992   21.68 20.23     ~ 88 0
5 QSO J0113-0935 QSO 01 13 51.9711693600 -09 35 51.080341308   20.20 19.28     ~ 26 0
6 QSO J0127-0045 QSO 01 27 00.6906783576 -00 45 59.149137528   19.95 18.95     ~ 52 0
7 QSO J0140-0839 QSO 01 40 49.1830961952 -08 39 42.462483840   19.62 18.57     ~ 55 0
8 SDSS J020332.38+001229.0 QSO 02 03 32.389 +00 12 29.10           ~ 41 0
9 QSO J0244-0816 QSO 02 44 47.7940688688 -08 16 05.998665828   20.34 19.22     ~ 30 0
10 QSO J0307-4945 QSO 03 07 22.8949808808 -49 45 48.274545240     18.76     ~ 59 0
11 QSO J0324-2918 QSO 03 24 44.2954658256 -29 18 21.220152624     18.66 19.41   ~ 41 0
12 QSO J0331-0741 QSO 03 31 19.6631898672 -07 41 43.170430344   25.87 22.92     ~ 38 0
13 QSO J0332-0654 QSO 03 32 23.5103924448 -06 54 50.556704580   22.10 20.76     ~ 23 0
14 QSO J0334-1612 QSO 03 34 13.4320665912 -16 12 05.308048188     17.86     ~ 21 0
15 QSO J0344-0653 QSO 03 44 02.8523261832 -06 53 00.593776896   20.09 19.29     ~ 25 0
16 QSO J0355-3811 QSO 03 55 04.8756518568 -38 11 42.543056760     17.95     ~ 24 0
17 QSO J0419-5716 QSO 04 19 50.9421498024 -57 16 12.986233104     17.78     ~ 20 0
18 SDSS J081827.40+172251.8 QSO 08 18 27.399 +17 22 51.83   25.14 24.42     ~ 60 0
19 SDSS J083643.85+005453.3 QSO 08 36 43.8598536120 +00 54 53.233681320   26.19 24.17     ~ 138 0
20 QSO J0842+0637 QSO 08 42 03.3496851936 +06 37 52.228870824   20.28 19.41     ~ 25 0
21 QSO J0935+0022 QSO 09 35 56.9191378176 +00 22 55.681297716   20.26 19.37     ~ 38 0
22 QSO J0949+0335 QSO 09 49 32.2676631768 +03 35 31.756872768   20.05 18.97     ~ 36 0
23 QSO J1020+0922 QSO 10 20 40.6230869016 +09 22 54.238672668   19.94 19.20     ~ 40 0
24 SDSS J103027.09+052455.0 QSO 10 30 27.092 +05 24 55.02   26.15 25.44     ~ 244 0
25 QSO J1037+0704 QSO 10 37 32.3836726200 +07 04 26.291458380   20.26 19.24     ~ 34 0
26 QSO J1110+0244 QSO 11 10 08.6149313520 +02 44 58.123439448   20.05 19.05     ~ 34 0
27 QSO J1135+0842 QSO 11 35 36.4035540672 +08 42 19.019448504   19.98 19.14     ~ 36 0
28 QSO J1249-0159 QSO 12 49 57.2390828736 -01 59 28.777376220   18.93 18.19     ~ 52 0
29 QSO J1305+0521 QSO 13 05 02.2779755136 +05 21 51.162622020   21.21 20.09     ~ 33 0
30 SDSS J130608.25+035626.3 QSO 13 06 08.259 +03 56 26.19   25.59 24.81     ~ 145 0
31 SDSS J131911.29+095051.3 QSO 13 19 11.291 +09 50 51.49           ~ 75 0
32 QSO J1402+0146 QSO 14 02 48.0782861640 +01 46 34.056646428   20.89 19.64     ~ 32 0
33 QSO J1408+0205 QSO 14 08 50.9138577456 +02 05 22.680293784   20.55 19.75     ~ 35 0
34 SDSS J141111.27+121737.3 QSO 14 11 11.277 +12 17 37.31   24.79 23.82     ~ 68 0
35 QSO B1422+2309 BLL 14 24 38.09400 +22 56 00.5900   16.77 15.84 14.79   ~ 437 1
36 [PBW92] 1422+231 gLS 14 24 38.09400 +22 56 00.5900   16.77 15.84 14.79   ~ 356 0
37 QSO J1433+0227 QSO 14 33 52.2087347832 +02 27 13.974100416   22.31 20.74     ~ 41 0
38 CFHQS J150941-174926 QSO 15 09 41.8 -17 49 27           ~ 58 0
39 QSO J1538+0855 QSO 15 38 30.5596599072 +08 55 17.150004552   18.77 17.98     ~ 30 0
40 QSO J1616+0501 QSO 16 16 22.1107195512 +05 01 27.718632228   23.50 21.80     ~ 22 0
41 QSO J1620+0020 QSO 16 20 48.7425118848 +00 20 05.763910776   22.35 20.90     ~ 22 0
42 QSO B1618-0035 QSO 16 21 16.9228185456 -00 42 50.909201856   18.92 17.97     ~ 74 0
43 PSO J326.8571-08.6429 QSO 21 47 25.7103966144 -08 38 34.639918404   21.34 20.18     ~ 31 0
44 QSO J2225-0014 QSO 22 25 09.1923562032 -00 14 06.799695468   23.45 21.91     ~ 45 0
45 QSO J2228-0757 QSO 22 28 45.1385957995 -07 57 55.319678934   26.22 23.86     ~ 32 0
46 SDSS J231038.88+185519.7 QSO 23 10 38.888 +18 55 19.72           ~ 63 0
47 QSO J2349-3712 QSO 23 49 13.7825429232 -37 12 59.310558144     18.69     ~ 18 0

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2022.11.26-09:38:51

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