2011ApJ...736...38K


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.24CEST23:30:55

2011ApJ...736...38K - Astrophys. J., 736, 38 (2011/July-3)

Obscured starburst activity in high-redshift clusters and groups.

KOCEVSKI D.D., LEMAUX B.C., LUBIN L.M., GAL R., McGRATH E.J., FASSNACHT C.D., SQUIRES G.K., SURACE J.A. and LACY M.

Abstract (from CDS):

Using Spitzer-Multiband Imaging Photometer 24 µm imaging and extensive Keck spectroscopy, we examine the nature of the obscured star-forming population in three clusters and three groups at z ∼ 0.9. These six systems are the primary components of the Cl1604 supercluster, the largest structure imaged by Spitzer at redshifts approaching unity. We find that the average density of 24 µm detected galaxies within the Cl1604 clusters is nearly twice that of the surrounding field and that this overdensity scales with the cluster's dynamical state. The 24 µm bright members often appear optically unremarkable and exhibit only moderate [O II] line emission due to severe obscuration. Their spatial distribution suggests that they are an infalling population, but an examination of their spectral properties, morphologies, and optical colors indicates that they are not simply analogs of the field population that have yet to be quenched. Using stacked composite spectra, we find that the 24 µm detected cluster and group galaxies exhibit elevated levels of Balmer absorption compared with galaxies undergoing normal, continuous star formation. A similar excess is not observed in field galaxies with equivalent infrared luminosities, indicating a greater fraction of the detected cluster and group members have experienced a burst of star formation in the recent past compared to their counterparts in the field. Our results suggest that gas-rich galaxies at high redshift experience a temporary increase in their star formation activity as they assemble into denser environments. Using Hubble Space Telescope Advanced Camera for Surveys imaging, we find that disturbed morphologies are common among the 24 µm detected cluster and group members and become more prevalent in regions of higher galaxy density. We conclude that mergers are the dominant triggering mechanism responsible for the enhanced star formation found in the Cl1604 groups, while a mix of harassment and mergers are likely driving the activity of the cluster galaxies.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: clusters: general - galaxies: evolution - infrared: galaxies

Status at CDS:  

Simbad objects: 22

goto Full paper

goto View the reference in ADS

Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 ZwCl 0024+1652 ClG 00 26 36.0 +17 08 36     18.35     ~ 602 1
2 ClG J0152-1358 ClG 01 52 41.3 -13 58 13           ~ 240 3
3 NGC 1134 IG 02 53 41.3600789046 +13 00 51.205830693   13.2       ~ 104 1
4 ClG 0451-03 ClG 04 54 10.9 -03 01 07     20.0     ~ 326 0
5 ACO 851 ClG 09 42 56.6 +46 59 22           ~ 307 0
6 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5310 6
7 ClG 1054-03 ClG 10 57 00.2 -03 37 27     22     ~ 448 0
8 NAME GOODS-N Field reg 12 36 55.0 +62 14 15           ~ 909 1
9 ACO 1763 ClG 13 35 20.1 +41 00 04           ~ 257 0
10 ACO 1787 ClG 13 45 59.94 +36 47 00.0           ~ 8 0
11 ClG J1603+4323 ClG 16 03 11.26 +43 23 30.3           ~ 7 0
12 ClG J1604+4322 ClG 16 03 34.86 +43 22 50.7           ~ 8 1
13 ClG J1603+4330 ClG 16 03 40.57 +43 30 59.3           ~ 4 0
14 ClG J1604+4324 ClG 16 03 45.4 +43 24 07           ~ 8 1
15 NAME Cl J1604 Supercluster SCG 16 04 +43.0           ~ 40 1
16 ClG J1604+4313 ClG 16 04 05.0 +43 13 32           ~ 5 1
17 ClG J1604+4316 ClG 16 04 05.7 +43 15 53           ~ 14 1
18 ClG 1603+4313 ClG 16 04 23.7 +43 04 52           ~ 126 1
19 ClG 1602.7+4322 ClG 16 04 23.74 +43 14 07.8           ~ 10 0
20 ClG 1602.9+4329 ClG 16 04 35.3 +43 21 02           ~ 48 1
21 ClG J1605+4322 ClG 16 04 49.2 +43 22 19           ~ 8 1
22 NGC 6090 PaG 16 11 40.3 +52 27 21   14.0       ~ 394 2

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2011ApJ...736...38K and select 'bookmark this link' or equivalent in the popup menu


2020.05.24-23:30:55

© Université de Strasbourg/CNRS

    • Contact