J/ApJ/775/116 z<0.06 active black hole galaxies from SDSS-DR8 (Reines+, 2013)
Dwarf galaxies with optical signatures of active massive black holes.
Reines A.E., Greene J.E., Geha M.
<Astrophys. J., 775, 116 (2013)>
=2013ApJ...775..116R 2013ApJ...775..116R
ADC_Keywords: Active gal. nuclei ; Spectroscopy ; Photometry, SDSS
Keywords: galaxies: active; galaxies: dwarf; galaxies: nuclei; galaxies: Seyfert
Abstract:
We present a sample of 151 dwarf galaxies (108.5≲M*≲109.5M☉)
that exhibit optical spectroscopic signatures of accreting massive
black holes (BHs), increasing the number of known active galaxies in
this stellar-mass range by more than an order of magnitude. Utilizing
data from the Sloan Digital Sky Survey Data Release 8 and stellar
masses from the NASA-Sloan Atlas, we have systematically searched for
active BHs in ∼25000 emission-line galaxies with stellar masses
comparable to the Magellanic Clouds and redshifts z<0.055. Using the
narrow-line [OIII]/Hβ versus [NII]/Hα diagnostic diagram,
we find photoionization signatures of BH accretion in 136 galaxies, a
small fraction of which also exhibit broad Hα emission. For
these broad-line active galactic nucleus (AGN) candidates, we estimate
BH masses using standard virial techniques and find a range of
105≲MBH≲106M☉ and a median of MBH∼2x105M☉. We
also detect broad Hα in 15 galaxies that have narrow-line ratios
consistent with star-forming galaxies. Follow-up observations are
required to determine if these are true type 1 AGN or if the broad
Hα is from stellar processes. The median absolute magnitude of
the host galaxies in our active sample is Mg=-18.1mag, which is
∼1-2mag fainter than previous samples of AGN hosts with low-mass BHs.
This work constrains the smallest galaxies that can form a massive BH,
with implications for BH feedback in low-mass galaxies and the origin
of the first supermassive BH seeds.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 83 136 BPT diagram AGN and composites: galaxy properties
table2.dat 153 136 BPT diagram AGN and composites: emission line fluxes
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See also:
V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)
J/MNRAS/431/836 : Type 1 AGN at low z. III. (Stern+, 2013)
J/ApJ/763/133 : Broad-line AGN with host galaxy colors (Trump+, 2013)
J/ApJ/758/129 : 4Ms Chandra Deep Field South 6-8keV galaxies (Xue+, 2012)
J/ApJ/755/167 : Low-mass black holes in SDSS Seyfert 1 galaxies (Dong+, 2012)
J/AJ/144/4 : Local Group dwarf galaxy properties (McConnachie+, 2012)
J/ApJS/201/23 : Spectroscopy of 88 z<0.7 SDSS QSOs (Eracleous+, 2012)
J/ApJ/742/68 : HST observations of low-mass BH host galaxies (Jiang+, 2011)
J/ApJ/733/60 : Accretion rate of AGNs from COSMOS surveys (Trump+, 2011)
J/AJ/142/153 : Precision spectrophotometry at the level of 0.1% (Yan, 2011)
J/ApJ/680/169 : SDSS DR5 virial black hole masses (Shen+, 2008)
J/ApJ/670/92 : New sample of low-mass black holes in AGN (Greene+, 2007)
J/ApJ/667/131 : Mass function of active black holes (Greene+, 2007)
J/ApJS/166/470 : SDSS-Spitzer type I QSOs IR photometry (Richards+, 2006)
J/ApJ/641/L21 : BH mass and velocity dispersion relation (Greene+, 2006)
J/ApJ/613/682 : AGN central masses & broad-line region sizes (Peterson+, 2004)
J/A+A/401/1063 : Evolutionary synthesis models. III. (Anders+, 2003)
http://www.nsatlas.org/ : The NASA-Sloan Atlas home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/136] Running sequence number (G1)
5 A1 --- r_Seq [abcd] Origin (1)
7- 12 I6 --- NSAID NASA-Sloan Atlas identification number
14- 32 A19 --- SDSS SDSS identification (JHHMMSS.ss+DDMMSS.s)
34- 37 I4 --- Plate Plate of SDSS spectrum
38 A1 --- --- [-]
39- 43 I5 d MJD MJD of SDSS spectrum
44 A1 --- --- [-]
45- 47 I3 --- Fiber Fiber of SDSS spectrum
49- 54 F6.4 --- z [0.001/0.06] Redshift (2)
56- 59 F4.2 [Msun] logM* [8/9.5] Log of the stellar mass (2)
61- 66 F6.2 mag gMag [-21.2/-15.1] Absolute g-band magnitude (2)
68- 72 F5.2 mag g-r The (g-r) color index (2)
74- 77 F4.2 kpc r50 [0.4/6.7] Petrosian 50% light radius (2)
79- 83 F5.3 --- n [0.5/6] Sersic index (2)
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Note (1): Flag as follows:
a = Galaxies in Barth et al. (2008AJ....136.1179B 2008AJ....136.1179B);
b = Galaxies in Greene & Ho (2007, J/ApJ/670/92) and Dong et al. (2012,
J/ApJ/755/167);
c = NGC 4395 (Filippenko & Sargent 1989ApJ...342L..11F 1989ApJ...342L..11F;
Filippenko & Ho 2003ApJ...588L..13F 2003ApJ...588L..13F);
d = Galaxy in Dong et al. (2007ApJ...657..700D 2007ApJ...657..700D).
Note (2): All values are from the NASA-Sloan Atlas (http://www.nsatlas.org/)
and assume h=0.73.
Magnitudes are K-corrected to rest-frame values using kcorrect v4_2
and corrected for foreground Galactic extinction.
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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- 3 I3 --- Seq [1/136] Running sequence number (G1)
5- 11 F7.1 10-20W/m2 Hb-n The narrow H-β emission line flux (3)
13- 18 F6.1 10-20W/m2 e_Hb-n Error on Hb-n (3)
20- 26 F7.1 10-20W/m2 Hb-b [70/894]?=0 Broad H-β emission line
flux (3)
28- 33 F6.1 10-20W/m2 e_Hb-b [11/40]?=0 Error on Hb-b (3)
35- 41 F7.1 10-20W/m2 O5007 The [OIII] 5007Å emission line flux (3)
43- 48 F6.1 10-20W/m2 e_O5007 Error on O-5007 (3)
50- 56 F7.1 10-20W/m2 O6300 [6/3543]?=0 [OI] 6300 emission line flux (3)
58- 63 F6.1 10-20W/m2 e_O6300 [1/49]?=0 Error on O6300 (3)
65- 71 F7.1 10-20W/m2 N6548 The [NII] 6548 emission line flux (3)
73- 78 F6.1 10-20W/m2 e_N6548 Error on N6548 (3)
80- 86 F7.1 10-20W/m2 Ha-n The narrow H-α emission line flux (3)
88- 93 F6.1 10-20W/m2 e_Ha-n Error on Ha-n (3)
95-101 F7.1 10-20W/m2 Ha-b [56/6167]?=0 Broad H-α emission line
flux (3)
103-108 F6.1 10-20W/m2 e_Ha-b [9/73]?=0 Error on Ha-b (3)
110-116 F7.1 10-20W/m2 N6583 The [NII] 6583 emission line flux (3)
118-123 F6.1 10-20W/m2 e_N6583 Error on N6583 (3)
125-131 F7.1 10-20W/m2 S6716 The [SII] 6716 emission line flux (3)
133-138 F6.1 10-20W/m2 e_S6716 Error on S6716 (3)
140-146 F7.1 10-20W/m2 S6731 The [SII] 6731 emission line flux (3)
148-153 F6.1 10-20W/m2 e_S6731 Error on S6731 (3)
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Note (3): In units of 10-17erg/s/cm2. A flux value of 0.0 indicates
the line was not detected. In the cases where a broad component of
Hα or Hβ is detected, we use the flux of the narrow
component to calculate the emission line ratios for the BPT diagram
(Baldwin, Phillips & Terlevich, 1981PASP...93....5B 1981PASP...93....5B)
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Global notes:
Note (G1): ID numbers 1-35 are BPT AGN and ID numbers 36-136 are BPT composites.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 17-Mar-2015