J/ApJ/790/76 Galaxies near NGC 891 properties (Schulz, 2014)
Dwarf galaxies in the halo of NGC 891.
Schulz E.
<Astrophys. J., 790, 76 (2014)>
=2014ApJ...790...76S 2014ApJ...790...76S (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Photometry, ultraviolet ; Photometry, infrared
Keywords: galaxies: clusters: individual: NGC 891 - galaxies: dwarf -
galaxies: groups: individual: A347 - surveys
Abstract:
We report the results of a survey of the region within 40 arcmin of
NGC 891, a nearby nearly perfectly edge-on spiral galaxy. Candidate
"non-stars" with diameters greater than 15 arcsec were selected from
the GSC 2.3.2 catalog and cross-comparison of observations in several
bands using archived GALEX, DSS2, WISE, and Two Micron All Sky Survey
images identified contaminating stars, artifacts, and background
galaxies, all of which were excluded. The resulting 71 galaxies, many
of which were previously uncataloged, comprise a size-limited survey
of the region. A majority of the galaxies are in the background of NGC
891 and are for the most part members of the A347 cluster at a
distance of about 75 Mpc. The new finds approximately double the known
membership of A347, previously thought to be relatively sparse. We
identify a total of seven dwarf galaxies, most of which are new
discoveries. The newly discovered dwarf galaxies are dim and gas-poor
and may be associated with the previously observed arcs of red giant
branch halo stars in the halo and the prominent H I filament and the
lopsided features in the disk of NGC 891. Several of the dwarfs show
signs of disruption, consistent with being remnants of an ancient
collision.
Description:
A methodical search for visible galaxies in the vicinity of NGC 891
was undertaken by examining candidates taken from The Guide Star
Catalog II (GSC 2.3.2; Lasker et al. 2008AJ....136..735L 2008AJ....136..735L). The GSC
2.3.2 is a deep all-sky catalog derived from the Digitized Sky
Surveys, which in turn were created from Palomar and UK Schmidt survey
plates, and is based on at least two epochs and three passbands. The
candidates were 173 "nonstars" from the GSC 2.3.2 catalog lying within
40' of NGC 891 (113 kpc at the distance of NGC 891) for which the
major axis was greater than 15''. The search region was limited in
order to keep the number of candidates to a reasonable total and
because GALEX observations covered this region.
Objects:
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RA (ICRS) DE Designation(s)
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02 22 32.91 +42 20 53.9 NGC 891 = TC 454
02 25 50 +41 52.5 A347 = FR 19
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 95 71 Galaxies near NGC 891
table2.dat 71 71 GALEX and WISE Magnitudes
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See also:
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
I/305 : The Guide Star Catalog, Version 2.3.2 (GSC2.3) (STScI, 2006)
II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
J/ApJ/619/193 : Catalog of nearby cluster galaxy photometry (McIntosh+, 2005)
J/A+A/542/A39 : NIR photometry in 10 nearby spiral galaxies (Grosboel+, 2012)
J/ApJS/199/36 : Hα survey of nearby clusters of galaxies (Sakai+, 2012)
J/A+A/575/A17 : NGC 891 Herschel PACS and SPIRE spectroscopy (Hughes+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- ID Identifier number
4- 13 A10 --- GSC2.3 GSC 2.3.2 ID (Cat. I/305)
14 A1 --- n_GSC2.3 [c] Note on GSC2.3 (1)
16- 17 I2 h RAh Hour of Right Ascension (J2000)
19- 20 I2 min RAm Minute of Right Ascension (J2000)
22- 23 I2 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 Minute of Declination (J2000)
32- 33 I2 arcsec DEs Second of Declination (J2000)
35- 39 F5.2 arcmin Dist Distance from NGC 891
41- 52 A12 --- AID Most commonly used alternate ID
54- 55 I2 --- SID ? ID number if listed in the Sakai et al.
catalog (2012, J/ApJS/199/36)
[SKM2012] N891 NN in Simbad
57 A1 --- 2MX [Y] Indicates if the galaxy is listed in
the 2MASX catalog
(Jarrett et al. 2000AJ....119.2498J 2000AJ....119.2498J,
Cat. VII/233)
59- 63 I5 km/s RV ? Radial velocity
65- 69 F5.2 mag RFmag ?=- Apparent RF magnitude (2)
71- 75 F5.2 mag BJmag ?=- Apparent BJ magnitude (2)
77- 81 F5.2 mag INmag ?=- Apparent IN magnitude (2)
82 A1 --- n_INmag [b] Note on INmag (3)
84- 87 F4.1 arcsec Rad Semi-major axis (2)
89- 92 F4.1 mag/arcsec2 NIRmu Calculated NIR surface brightness
93 A1 --- n_NIRmu [b] Note on NIRmu (3)
95 A1 --- Fore [F-] F indicates that this is a
foreground dwarf
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Note (1): No. 63 was incorrectly cataloged as a star (type = 0) in GSC2.3.
Note (2): This data from the GSC 2.3.2 catalog (Cat. I/305) is affected by
relatively large systematic errors.
Note (3): Estimated value.
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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- 2 I2 --- ID Identifier number
4- 13 A10 --- GSC2.3 GSC 2.3.2 ID (Cat. I/305)
15- 18 F4.1 mag FUVmag ?=- GALEX FUV apparent magnitude
20- 23 F4.1 mag NUVmag GALEX NUV apparent magnitude
25- 28 F4.1 mag W1mag WISE W1 apparent magnitude
30- 33 F4.1 mag W2mag WISE W2 apparent magnitude
35- 38 F4.1 mag W3mag ?=- WISE W3 apparent magnitude
40- 43 F4.1 mag W4mag ?=- WISE W4 apparent magnitude
45- 49 F5.1 mag W1Maga WISE W1 absolute magnitude for case a (1)
51- 55 F5.1 mag W1Magb ? WISE W1 absolute magnitude for case b (2)
57- 63 E7.2 Lsun W1La WISE W1 luminosity for case a (1)
65- 71 E7.2 Lsun W1Lb ? WISE W1 luminosity for case b (2)
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Note (1): Assuming a distance of 9.8 Mpc for foreground galaxies indicated
on Table 1 and 75 Mpc for the remaining galaxies.
Note (2): Assuming a distance of 75 Mpc for foreground galaxies for comparison.
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History:
From electronic version of the journal
(End) Prepared by Tiphaine Pouvreau [CDS] 20-Mar-2017