J/ApJ/818/182 Early-type galaxies at z<0.04 star formation rates (Vaddi+, 2016)
Constraints on feedback in the local universe: the relation between star
formation and AGN activity in early-type galaxies.
Vaddi S., O'Dea C.P., Baum S.A., Whitmore S., Ahmed R., Pierce K., Leary S.
<Astrophys. J., 818, 182 (2016)>
=2016ApJ...818..182V 2016ApJ...818..182V (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Photometry, infrared ;
Photometry, ultraviolet ; Radio sources
Keywords: galaxies: active; galaxies: evolution; galaxies: star formation
Abstract:
We address the relation between star formation and active galactic
nucleus (AGN) activity in a sample of 231 nearby (0.0002<z<0.0358)
early-type galaxies by carrying out a multi-wavelength study using
archival observations in the UV, IR, and radio. Our results indicate
that early-type galaxies in the current epoch are rarely powerful
AGNs, with P<1022W/Hz for a majority of the galaxies. Only massive
galaxies are capable of hosting powerful radio sources while less
massive galaxies are hosts to lower radio power sources. Evidence of
ongoing star formation is seen in approximately 7% of the sample. The
star formation rate (SFR) of these galaxies is less than
0.1M☉/yr. They also tend to be radio faint (P<1022W/Hz). There
is a nearly equal fraction of star-forming galaxies in radio faint
(P<1022W/Hz) and radio bright galaxies (P≥1022W/Hz) suggesting
that both star formation and radio mode feedback are constrained to be
very low in our sample. We notice that our galaxy sample and the
Brightest Cluster Galaxies follow similar trends in radio power versus
SFR. This may be produced if both radio power and SFR are related to
stellar mass.
Description:
The nearby galaxy sample was selected from the Two Micron All Sky
Survey (2MASS; Jarrett et al. 2003AJ....125..525J 2003AJ....125..525J) that has an
apparent Ks band (2.2um) magnitude of 13.5 and brighter and whose
positions correlate with the Chandra archive of ACIS-I and ACIS-S
observations (C. Jones 2015, private communication).
We examine observations in multiple wavelengths for this study,
namely, radio, IR, and UV.
IR observations were collected from the Wide-field Infrared Survey
Explorer (WISE; Wright et al. 2010AJ....140.1868W 2010AJ....140.1868W) and 2MASS (Jarrett
et al. 2003AJ....125..525J 2003AJ....125..525J). Rather than use the existing cataloged
values, we chose to perform photometry on 2MASS Ks band images and
WISE band images (see section 3.1).
Radio data for our sample are drawn from several resources: the NRAO
VLA Sky Survey (NVSS; Condon et al. 1998, VIII/65), Faint Images of
the Radio Sky at Twenty-centimeters (FIRST; Becker et al.
1995ApJ...450..559B 1995ApJ...450..559B, see VIII/92), and the Sydney University Molonglo
Sky Survey (SUMSS; Mauch et al. 2003, VIII/81).
Far-UV (FUV) and near-UV (NUV) magnitudes are collected from the
Galaxy Evolution Survey (GALEX) GR6 release.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 118 231 Observational properties of the sample (version
corrected by the author)
table2.dat 46 231 Derived properties of the sample (version corrected
by the author)
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See also:
VIII/92 : The FIRST Survey Catalog, Version 2014Dec17 (Helfand+ 2015)
II/328 : AllWISE Data Release (Cutri+ 2013)
II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)
VIII/81 : Sydney University Molonglo Sky Survey (SUMSS V2.1) (Mauch+ 2008)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
J/MNRAS/446/2985 : Double-lobed radio sources catalog (van Velzen+, 2015)
J/MNRAS/444/L63 : SFRs of Brightest Cluster Galaxies (Fraser-McKelvie+, 2014)
J/AJ/146/46 : Star Formation Rate in nearby galaxies (Karachentsev+, 2013)
J/MNRAS/423/422 : Early-type BCGs with star formation (Liu+, 2012)
J/ApJ/731/L41 : 1.4GHz obs. of bright early-type galaxies (Brown+, 2011)
J/ApJ/706/599 : Hα and UV SFR in the local volume (Lee+, 2009)
J/ApJS/176/39 : IR survey of brightest cluster galaxies I. (Quillen+, 2008)
J/ApJS/173/185 : GALEX UV atlas of nearby galaxies (Gil de Paz+, 2007)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name Name of the galaxy
12- 13 I2 h RAh Hour of Right Ascension (J2000)
15- 16 I2 min RAm Minute of Right Ascension (J2000)
18- 23 F6.3 s RAs Second of Right Ascension (J2000)
25 A1 --- DE- Sign of the Declination (J2000)
26- 27 I2 deg DEd Degree of Declination (J2000)
29- 30 I2 arcmin DEm Arcmin of Declination (J2000)
32- 36 F5.2 arcsec DEs Arcsecond of Declination (J2000)
38- 43 F6.4 --- z [0/0.04] Spectroscopic redshift
45- 52 F8.2 km/s RVel [-283/10903] Radial Velocity (HyperLEDA;
Makarov et al. 2014A&A...570A..13M 2014A&A...570A..13M)
54- 57 F4.1 --- TT [-5/9]? Morphological type;
de Vaucouleur's scale
59 A1 --- l_F1.4 Upper limit flag on F1.4
60- 69 F10.3 Jy F1.4 [0.5/119000] Radio flux density at 1.4GHz
71- 75 F5.2 mag W1mag [4.9/11.2] WISE 3.4 micron band magnitude
77- 81 F5.2 mag W2mag [4.8/11.1]?=0 WISE 4.6 micron band magnitude
83- 87 F5.2 mag W3mag [2.8/12.5]?=0 WISE 12 micron band magnitude
89- 93 F5.2 mag W4mag [-0.5/11.8]?=0 WISE 24 micron band magnitude
95- 99 F5.2 mag Ksmag [5.1/11.7]?=0 2MASS Ks apparent magnitude
101-105 F5.2 mag FUVmag [12.9/24.7]?=0 GALEX FUV band AB magnitude
107-111 F5.2 mag NUVmag [12.4/22.9]?=0 GALEX NUV band AB magnitude
113-118 F6.4 mag E(B-V) [0.007/0.4] Galactic reddening from GALEX
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name Galaxy identifier
12- 19 E8.2 Msun/yr SFR [0/0.5]? Star Formation Rate
21- 28 E8.2 Msun Mstar ? Stellar Mass
30 A1 --- l_P1.4 Upper limit flag on P1.4
32- 39 E8.2 W/Hz P1.4 ? Radio power at 1.4GHz (1)
41- 46 F6.2 mag KMag [-26.6/-18.6]? Absolute Ks band magnitude
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Note (1): The total radio power is calculated using the following
Equation (2): P1.4GHz=S1.4GHz4πDL_2 where DL is the
luminosity distance calculated using Equation (10) in the Appendix.
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Acknowledgements:
Sravani vaddi [Rochester Institute of Technology]
for the less truncated redshift values in table 1 and
for the correction of ESO351030 values in tables 1 and 2.
History:
From electronic version of the journal (and corrections from author).
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 09-May-2016