2010A&A...519L...4B


Query : 2010A&A...519L...4B

2010A&A...519L...4B - Astronomy and Astrophysics, volume 519, L4-4 (2010/9-1)

Herschel FIR counterparts of selected Lyα emitters at z ∼ 2.2. Fast evolution since z ∼ 3 or missed obscured AGNs?

BONGIOVANNI A., OTEO I., CEPA J., PEREZ GARCIA A.M., SANCHEZ-PORTAL M., EDEROCLITE A., AGUERRI J.A.L., ALFARO E.J., ALTIERI B., ANDREANI P., APARICIO-VILLEGAS M.T., AUSSEL H., BENITEZ N., BERTA S., BROADHURST T., CABRERA-CANO J., CASTANDER F.J., CAVA A., CERVINO M., CHULANI H., CIMATTI A., CRISTOBAL-HORNILLOS D., DADDI E., DOMINGUEZ H., ELBAZ D., FERNANDEZ-SOTO A., FOERSTER SCHREIBER N., GENZEL R., GOMEZ M.F., GONZALEZ DELGADO R.M., GRAZIAN A., GRUPPIONI C., HERREROS J.M., IGLESIAS GROTH S., INFANTE L., LUTZ D., MAGNELLI B., MAGDIS G., MAIOLINO R., MARQUEZ I., MARTINEZ V.J., MASEGOSA J., MOLES M., MOLINO A., NORDON R., DEL OLMO A., PEREA J., POGLITSCH A., POPESSO P., POZZI F., PRADA F., QUINTANA J.M., RIGUCCINI L., RODIGHIERO G., SAINTONGE A., SANCHEZ S.F., SANTINI P., SHAO L., STURM E., TACCONI L. and VALTCHANOV I.

Abstract (from CDS):

Lyα emitters (LAEs) are seen everywhere in the redshift domain from local to z∼7. Far-infrared (FIR) counterparts of LAEs at different epochs could provide direct clues on dust content, extinction, and spectral energy distribution (SED) for these galaxies. We search for FIR counterparts of LAEs that are optically detected in the GOODS-North field at redshift z∼2.2 using data from the Herschel Space Telescope with the Photodetector Array Camera and Spectrometer (PACS). The LAE candidates were isolated via color-magnitude diagram using the medium-band photometry from the ALHAMBRA Survey, ancillary data on GOODS-North, and stellar population models. According to the fitting of these spectral synthesis models and FIR/optical diagnostics, most of them seem to be obscured galaxies whose spectra are AGN-dominated. From the analysis of the optical data, we have observed a fraction of AGN or composite over source total number of ∼0.75 in the LAE population at z∼2.2, which is marginally consistent with the fraction previously observed at z=2.25 and even at low redshift (0.2<z<0.45), but significantly different from the one observed at redshift ∼3, which could be compatible either with a scenario of rapid change in the AGN fraction between the epochs involved or with a non detection of obscured AGN in other z=2-3 LAE samples due to lack of deep FIR observations. We found three robust FIR (PACS) counterparts at z∼2.2 in GOODS-North. This demonstrates the possibility of finding dust emission in LAEs even at higher redshifts.

Abstract Copyright:

Journal keyword(s): infrared: galaxies - galaxies: evolution - galaxies: high-redshift

Nomenclature: Fig. B.1, Table B.1: [BOC2010] ALHNNNNN N=16 among (Nos 00228-11687).

Simbad objects: 19

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Number of rows : 19
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1943 1
2 NAME GOODS Southern Field reg 03 32 28.0 -27 48 30           ~ 1186 1
3 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 1023 1
4 [BOC2010] ALH08364 AGN 12 37 02.1 +62 19 25           ~ 1 0
5 CXOHDFN J123704.2+621446 QSO 12 37 04.34 +62 14 46.1 24.55 24.4432 24.97 24.5 24.4307 ~ 39 0
6 [RSE2006] BX1514 AGN 12 37 14.9468 +62 17 00.439 25.11 25.2678 25.75 24.90 24.7200 ~ 8 0
7 [BOC2010] ALH11687 AGN 12 37 18.4 +62 23 00           ~ 1 0
8 GOODS J123726.11+621857.2 EmG 12 37 26.1139 +62 18 57.215 25.4 24.7687 24.92   24.2589 ~ 7 0
9 [BOC2010] ALH07181 AGN 12 37 30.7 +62 18 05           ~ 1 0
10 [BOC2010] ALH02515 AGN 12 37 34.3 +62 13 21           ~ 1 0
11 [BOC2010] ALH09753 AGN 12 37 34.3 +62 20 56           ~ 1 0
12 GOODS J123736.20+621058.1 AGN 12 37 36.17 +62 10 58.0           ~ 4 0
13 [BOC2010] ALH10766 EmG 12 37 36.4 +62 22 01           ~ 1 0
14 [BOC2010] ALH09289 AGN 12 37 41.6 +62 20 28           ~ 1 0
15 [BOC2010] ALH09821 EmG 12 37 42.4 +62 21 02           ~ 1 0
16 MODS wide 10296 EmG 12 37 43.2394 +62 17 46.432 26.5 26.2 26.0     ~ 3 0
17 [BOC2010] ALH05262 AGN 12 37 48.3 +62 16 10           ~ 1 0
18 [BOC2010] ALH04281 AGN 12 37 52.60620 +62 15 07.3334           ~ 2 0
19 [BOC2010] ALH03537 AGN 12 38 04.41322 +62 14 25.3021           ~ 2 0

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2022.05.28-16:16:09

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