FIR MEASUREMENTS OF Ly{alpha} EMITTERS AT z {approx}< 1.0: DUST ATTENUATION FROM PACS-HERSCHEL

Journal Article · Fri Jul 01 04:00:00 EDT 2011 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/735/1/L15· OSTI ID:21562570

Oteo, I; Bongiovanni, A; Perez Garcia, A M; Cepa, J; Ederoclite, A; Pintos-Castro, I ^[1]; Sanchez-Portal, M; Altieri, B ^[2]; Lutz, D; Berta, S; Magnelli, B; Popesso, P ^[3]; Le Floc'h, E ^[4]; Pozzi, F; Daddi, E ^[5]; Riguccini, L ^[6]; Andreani, P ^[7]; Aussel, H; Elbaz, D ^[8]; Cimatti, A ^[9]

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1. Instituto de Astrofisica de Canarias (IAC), E-38200 La Laguna, Tenerife (Spain)
2. Herschel Science Centre (ESAC), Villafranca del Castillo (Spain)
3. Max-Planck-Institut fuer Extraterrestrische Physik (MPE), Postfach 1312, 85741 Garching (Germany)
4. Institute for Astronomy, University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States)
5. INAF-Osservatorio Astronomico di Bologna, Via Ranzani 1, I-40127 Bologna (Italy)
6. Laboratoire AIM, CEA/DSM-CNRS-Universite Paris Diderot, IRFU/Service, d'Astrophysique, Bat.709, CEA-Saclay, 91191 Gif-sur-Yvette Cedex (France)
7. ESO, Karl-Schwarzchild-Str. 2, D-85748 Garching (Germany)
8. Commissariat a l'Energie Atomique (CEA-SAp) Saclay (France)
9. Dipartimento di Astronomia, Universita di Bologna, Via Ranzani 1, 40127 Bologna (Italy)

One remaining open question regarding the physical properties of Ly{alpha} emitters (LAEs) is their dust content and evolution with redshift. The variety of results is large and with those reported by now it is difficult to establish clear relations between dust, other fundamental parameters of galaxies (star formation rate, metallicity, or age), and redshift. In this Letter, we report Herschel PACS-100 {mu}m, PACS-160 {mu}m, and Spitzer MIPS-24 {mu}m detections of a sample of spectroscopically GALEX selected LAEs at z {approx} 0.3 and {approx}1.0. Five out of ten and one out of two LAEs are detected in, at least, one PACS band at z {approx} 0.3 and {approx}1.0, respectively. These measurements have a great importance given that they allow us to quantify, for the first time, the dust content in LAEs from direct FIR observations. MIPS-24 {mu}m detections allow us to determine the IR properties of the PACS-undetected LAEs. We obtain that mid-IR/FIR-detected star-forming (SF) LAEs at z {approx} 0.3 have dust content within 0.75 {approx}< A{sub 1200{sub A}} {approx}< 2.0, with a median value of A{sub 1200{sub A}} {approx} 1.1. This range broadens up to 0.75 {approx}< A{sub 1200{sub A}} {approx}< 2.5 when considering the LAEs at z {approx} 1.0. Only one SF LAE is undetected both in MIPS-24 {mu}m and PACS, with A{sub 1200{sub A}} {approx}< 0.75. These results seem to be larger than those reported for high-redshift LAEs and, therefore, although an evolutionary trend is not clearly seen, it could point out that low-redshift LAEs are dustier than high-redshift ones. However, the diverse methods used could introduce a systematic offset in the results.

• OSTI ID: 21562570
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 1 Vol. 735; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
ATTENUATION
DUSTS
EVOLUTION
GALACTIC EVOLUTION
GALAXIES
LYMAN LINES
RED SHIFT