J/other/AstBu/68.243 Star formation in isolated galaxies (Karachentsev+, 2013)
Star formation in nearby isolated galaxies.
Karachentsev I.D., Karachentseva V.E., Melnyk O.V., Courtois H.M.
<Astrophys. Bull., 68, 243 (2013)>
=2013AstBu..68..243K 2013AstBu..68..243K
ADC_Keywords: Galaxies, nearby ; Magnitudes ; Ultraviolet ; H I data ;
Morphology
Keywords: galaxies: star formation
Abstract:
We use the FUV fluxes measured with the GALEX to study the star
formation properties of galaxies collected in the Local Orphan
Galaxies catalog (LOG, 2011AstBu..66....1K 2011AstBu..66....1K). Among 517 LOG galaxies
having radial velocities VLG<3500km/s and Galactic latitudes
|b|>15°, 428 objects have been detected in FUV. We briefly discuss
some scaling relations between the specific star formation rate (SSFR)
and stellar mass, HI-mass, morphology, and surface brightness of
galaxies situated in extremely low density regions of the Local
Supercluster. Our sample is populated with predominantly late-type,
gas-rich objects with the median morphological type of Sdm. Only 5% of
LOG galaxies are classified as early types: E, S0, S0/a, however, they
systematically differ from normal E and S0 galaxies by lower
luminosity and presence of gas and dust. We find that almost all
galaxies in our sample have their SSFR below 0.4Gyr-1. This limit
is also true even for a sample of 260 active star-burst Markarian
galaxies situated in the same volume. The existence of such a
quasi-Eddington limit for galaxies seems to be a key factor which
characterizes the transformation of gas into stars at the current
epoch.
Description:
The updated Local Orphan Galaxies (LOG) catalog is presented in
Table 1. The LOGs was formed from the sample of galaxies in vicinity
of the Local Supercluster on scale about 40Mpc. It collected data,
including B-magnitudes, from NED and LEDA with some our own
corrections and additions. The catalog contains the data of star
formation rates for 517 LOG galaxies.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 145 517 Parameters of isolated galaxies in the Local
Orphan Galaxies (LOG) catalog
--------------------------------------------------------------------------------
See also:
VII/82 : Catalogue of Isolated Galaxies (Karachentseva+ 1986)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq [1/520] LOG number
6- 26 A21 --- Name Name of the galaxy in known catalogs
29- 30 I2 h RAh Right ascension (J2000.0)
31- 32 I2 min RAm Right ascension (J2000.0)
33- 36 F4.1 s RAs Right ascension (J2000.0)
37 A1 --- DE- Declination sign (J2000.0)
38- 39 I2 deg DEd Declination (J2000.0)
40- 41 I2 arcmin DEm Declination (J2000.0)
42- 43 I2 arcsec DEs Declination (J2000.0)
46- 50 F5.2 Mpc Dist Distance to the galaxy (Dist=VLG/Ho,
Ho=73km/s/Mpc)
53- 57 F5.2 mag Bmag B-band apparent magnitude from NED or LEDA
60- 63 F4.2 mag AGi Total Galactic and internal extinction, B-band
68- 69 I2 --- T [-3/10] Morphological type, de Vaucouleurs scale
73 A1 --- SB [HNL] Index of the average surface brightness
of the galaxy (H=high, N=normal, L=low)
77- 80 F4.2 [-] loga/b [0/1.25] Log of the apparent axial ratio
84- 88 F5.2 mag Kmagc Apparent magnitude of the galaxy in the Ks-band,
corrected (1)
91- 95 F5.2 [mJy] logFUV ?=-9.99 Log of the total FUV flux of galaxies
99-103 F5.2 [Jy.km/s] logFHI ?=-9.99 Log of the flux in HI radio line
106-108 I3 km/s W50 ?=-99 The HI line width on the level of 50%
from the peak
112-116 F5.2 [Msun/yr] logSFR ?=-9.99 Star formation rate in the galaxies
120-124 F5.2 [Msun] logM* Log of stellar mass of the galaxy (2)
128-132 F5.2 --- P ?=-9.99 Dimensionless parameter P(past) (3)
135-139 F5.2 --- F ?=-9.99 Dimensionless parameter F(future) (4)
141-145 A5 --- Note [pec,* ] Note(s) (5)
--------------------------------------------------------------------------------
Note (1): Apparent magnitude of the galaxy in the Ks-band, corrected for
Galactic and internal extinction. K-Kc=0.085*AGi, since the majority of
galaxies in the Local Orphan Galaxies (LOG) catalog relate to the late types
for which the 2MASS sky survey greatly underestimates the integral IR fluxes,
we determined the Ks-magnitude from the B-magnitude and the average color
index: B-K=4.10 for the T<3 types, B-K=4.60-0.2*T for the T=3-8 types and
B-K=2.35 for T=9,10 according to the recommendations from Jarrett et al.
(2003AJ....125..525J 2003AJ....125..525J) and Karachentsev & Kutkin (2005, Cat. J/PAZh/31/332).
Note (2): Stellar mass was determined from the integral Ks -luminosity at
M*/LK=1 and apparent magnitude of the Sun MK=3.28.
Note (3): Parameter P (Past) as P=log(SFR*T0/LK).
Note (4): Parameter F (Future) as F=log(1.85*MHI/SFR*T0), where
T0=13.7*109yr is the age of the Universe, MHI is the hydrogen mass of
the galaxy; MHI=2.356*105*D2*FHI, and the 1.85 coefficient takes
into account the contribution of helium and molecular hydrogen in the total
mass of gas (Fukugita et al., 2004ApJ...616..643F 2004ApJ...616..643F).
Note (5): Note as follows:
pec = Existence of peculiarities in the structure of the given galaxy
* = galaxies with individual estimates of distances from NED
--------------------------------------------------------------------------------
Acknowledgement:
Igor Karachentsev, ikar(at)sao.ru,
Olga Melnyk, melnyk(at)astro.ulg.ac.be
(End) Igor Karachentsev [SAO], Emmanuelle Perret [CDS] 29-Jul-2013