A Survey for Low Surface Brightness Dwarf Galaxies Around M31

International Astronomical Union Colloquium ◽

10.1017/s025292110005418x ◽

1999 ◽

Vol 171 ◽

pp. 111-119 ◽

Cited By ~ 3

Author(s):

Taft E. Armandroff ◽

James E. Davies ◽

George H. Jacoby

Keyword(s):

Surface Brightness ◽

Dwarf Galaxies ◽

Digital Filtering ◽

Low Surface Brightness ◽

Filtering Technique

AbstractBy applying a digital filtering technique to 1550 deg2 of the POSS-II in the vicinity of M31, we found two previously unidentified very low surface brightness dwarf galaxies which we designate And V and VI. Follow-up imaging with the KPNO 4-m telescope resolved these into stars easily. The V- and I- band images of And V indicate a distance similar to that of M31, and <[Fe/H]> ~ −1.5. All evidence strongly supports its classification as a dwarf spheroidal companion to M31. Data for And VI are being analyzed, but preliminary indications support a similar conclusion. Our search for more dwarfs, including follow-up observations of numerous candidates found via digital filtering, is incomplete; thus, further identifications may be forthcoming.

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Hubble Space Telescope imaging of globular cluster candidates in low surface brightness dwarf galaxies

Astronomy and Astrophysics ◽

10.1051/0004-6361:20052921 ◽

2005 ◽

Vol 442 (1) ◽

pp. 85-95 ◽

Cited By ~ 40

Author(s):

M. E. Sharina ◽

T. H. Puzia ◽

D. I. Makarov

Keyword(s):

Globular Cluster ◽

Surface Brightness ◽

Dwarf Galaxies ◽

Hubble Space Telescope ◽

Space Telescope ◽

Low Surface Brightness

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Low Surface Brightness Dwarf Galaxies in Nearby Clusters

International Astronomical Union Colloquium ◽

10.1017/s0252921100054257 ◽

1999 ◽

Vol 171 ◽

pp. 157-159

Author(s):

Kristin Chiboucas ◽

Mario Mateo

Keyword(s):

Galaxy Clusters ◽

Surface Brightness ◽

Dwarf Galaxies ◽

Cluster Galaxy ◽

V Band ◽

Luminosity Functions ◽

Low Surface Brightness ◽

Initial Results

AbstractWe present initial results of a study of low surface brightness dwarf galaxies within galaxy clusters at z ≤ .03 as part of our program to determine the clustering properties, luminosity functions, and morphologies of dwarf galaxies in a wider range of cluster environments. In addition to deep V-band images covering up to 1 deg2 in each of 13 different clusters, we have obtained velocities from fiber spectroscopy for 235 galaxies in A3526. In A3526, we find a drop in cluster galaxy counts at intermediate magnitudes which is supported by our spectroscopic results.

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Low Surface Brightness Galaxies in Deep Surveys

International Astronomical Union Colloquium ◽

10.1017/s0252921100054142 ◽

1999 ◽

Vol 171 ◽

pp. 76-83

Author(s):

Henry C. Ferguson

Keyword(s):

Surface Brightness ◽

Dwarf Galaxies ◽

Recent Literature ◽

Solid Angle ◽

Large Space ◽

Space Density ◽

Faint Galaxy ◽

Low Surface Brightness ◽

Low Surface Brightness Galaxies ◽

Lsb Galaxies

AbstractWe examine the constraints that can be placed on the space density of low-surface-brightness galaxies from deep HST images. Such images, while covering only a small solid angle, provide enough depth and spatial resolution to detect LSB galaxies at moderate redshift and distinguish them from galaxies of higher surface brightness.We consider five simple models of the non-evolving or slowly-evolving population of LSB galaxies, motivated by various discussions in the recent literature. The basic results are (1) models with a large space-density of giant LSB galaxies at moderate redshift do not look like the real world and, (2) models with a large space-density of dwarf LSB galaxies are consistent with HST data (that is, they do not produce more faint LSB galaxies per unit solid angle than are detected at magnitudes I ≳ 23), but these LSB dwarf galaxies do not contribute much to faint galaxy counts unless they formed their stars in a rapid burst.

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Gas-rich LSB Galaxies – Progenitors of Blue Compact Dwarfs?

International Astronomical Union Colloquium ◽

10.1017/s0252921100054415 ◽

1999 ◽

Vol 171 ◽

pp. 253-260 ◽

Cited By ~ 1

Author(s):

John J. Salzer ◽

Stuart A. Norton

Keyword(s):

Star Formation ◽

Surface Brightness ◽

Dwarf Galaxies ◽

Dwarf Galaxy ◽

Mass Density ◽

Central Mass ◽

Galaxy Distribution ◽

Low Surface Brightness ◽

Central Regions ◽

Lsb Galaxies

AbstractWe analyze deep CCD images of nearby Blue Compact Dwarf (BCD) galaxies in an attempt to understand the nature of the progenitors which are hosting the current burst of star formation. In particular, we ask whether BCDs are hosted by normal or low-surface-brightness dI galaxies. We conclude that BCDs are in fact hosted by gas-rich galaxies which populate the extreme high-central-mass-density end of the dwarf galaxy distribution. Such galaxies are predisposed to having numerous strong bursts of star formation in their central regions. In this picture, BCDs can only occur in the minority of dwarf galaxies, rather than being a common phase experienced by all gas-rich dwarfs.

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The Ghosts of Galaxies: Tidal Debris in Clusters

Symposium - International Astronomical Union ◽

10.1017/s0074180900197153 ◽

2004 ◽

Vol 217 ◽

pp. 70-76

Author(s):

Michael D. Gregg ◽

Michael J. West

Keyword(s):

Globular Clusters ◽

Surface Brightness ◽

Large Scale ◽

Dwarf Galaxies ◽

Cluster Formation ◽

X Ray ◽

Cluster Evolution ◽

Low Surface Brightness ◽

Intergalactic Space ◽

Formation And Evolution

Gravitational interactions in rich clusters can strip material from the outer parts of galaxies or even completely disrupt entire systems, giving rise to large scale, low surface brightness ghostly features stretching across intergalactic space. The nearby Coma and Centaurus clusters both have striking examples of galaxy ghosts, in the form of 100 kpc-long plumes of intergalactic debris. By searching HST archival images, we have found numerous other examples of galaxy ghosts in rich clusters at low redshift, evidence that galaxy destruction and recycling are ubiquitous, important in cluster formation and evolution, and continue to mold clusters at the present epoch. Many ghosts appear in X-ray bright clusters, perhaps signaling a connection with energetic subcluster mergers.The fate of such material has important ramifications for cluster evolution. Our new HST WFPC2 V & I images of a portion of the Centaurus plume reveal that it contains an excess of discrete objects with −12 < MV < −6, consistent with being globular clusters or smaller dwarf galaxies. This tidally liberated material is being recycled directly into the intracluster population of stars, dwarf galaxies, globular clusters, and gas, which may have been built largely from a multitude of similar events over the life of the cluster.

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Star Formation Thresholds in Low Surface Brightness Dwarf Galaxies

International Astronomical Union Colloquium ◽

10.1017/s0252921100054440 ◽

1999 ◽

Vol 171 ◽

pp. 274-281

Author(s):

Liese van Zee

Keyword(s):

Star Formation ◽

Comparative Study ◽

Column Density ◽

Surface Brightness ◽

Dwarf Galaxies ◽

Critical Threshold ◽

Active Star ◽

Comparison Sample ◽

Active Star Formation ◽

Low Surface Brightness

AbstractThe results of a comparative study of star formation thresholds in gas-rich, low surface brightness, dwarf galaxies are presented. Approximately half the galaxies in the study were “high MH/LB” galaxies, which appear to have inefficient star formation properties. The comparison sample comprised of otherwise “normal” dwarf galaxies, with moderate current star formation rates. In all systems, sites of active star formation were associated with local peaks in the HI column density. For both types of galaxies, the azimuthally averaged gas column density is low. Similar to other LSB systems, the global gas densities are well below the critical threshold for star formation throughout the system. Thus, star formation is inhibited globally, but occurs locally in these gas-rich dwarf galaxies.

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The Hi Neighborhoods Around STARBIRDS

Proceedings of the International Astronomical Union ◽

10.1017/s1743921318005811 ◽

2018 ◽

Vol 14 (S344) ◽

pp. 280-282

Author(s):

Megan C. Johnson ◽

Kristen B. W. McQuinn ◽

John Cannon ◽

Charlotte Martinkus ◽

Evan Skillman ◽

...

Keyword(s):

Star Formation ◽

Surface Brightness ◽

Spiral Galaxies ◽

Dwarf Galaxies ◽

Neutral Hydrogen ◽

Tidal Interactions ◽

Low Surface Brightness ◽

The Galaxy ◽

Green Bank Telescope ◽

Intense Star Formation

AbstractStarbursts are finite periods of intense star formation (SF) that can dramatically impact the evolutionary state of a galaxy. Recent results suggest that starbursts in dwarf galaxies last longer and are distributed over more of the galaxy than previously thought, with star formation efficiencies (SFEs) comparable to spiral galaxies, much higher than those typical of non-bursting dwarfs. This difference might be explainable if the starburst mode is externally triggered by gravitational interactions with other nearby systems. We present new, sensitive neutral hydrogen observations of 18 starburst dwarf galaxies, which are part of the STARburst IRregular Dwarf Survey (STARBIRDS) and each were mapped with the Green Bank Telescope (GBT) and/or Parkes Telescope in order to study the low surface brightness gas distributions, a common tracer for tidal interactions.

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HI in Karachentsev Objects Properties of new nearby Dwarf Galaxies

International Astronomical Union Colloquium ◽

10.1017/s0252921100054476 ◽

1999 ◽

Vol 171 ◽

pp. 299-306

Author(s):

W.K. Huchtmeier

Keyword(s):

Column Density ◽

Detection Rate ◽

Surface Brightness ◽

Dwarf Galaxies ◽

Disk Galaxies ◽

Local Volume ◽

Low Surface Brightness ◽

Compact Array

AbstractThis is a report on HI observations of newly discovered nearby dwarf galaxies, most of which of low surface brightness, from the first section of the Karachentsev catalog. Observations were performed using the 100-m radiotelescope at Effelsberg, the Nançay radiotelescope, and the compact array of the Australia Telescope. We observed 220 galaxies with a detection rate of about 60%. 35 of the observed galaxies are located within the Local Volume (i.e., within 10 Mpc). The smallest detected galaxies have diameters around 0.3 kpc and HI-masses of a few times 106 solar masses. We confirm a correlation between HI column density and surface brightness of gas-rich disk galaxies.

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The MESSIER surveyor: unveiling the ultra-low surface brightness universe

Proceedings of the International Astronomical Union ◽

10.1017/s1743921316011388 ◽

2016 ◽

Vol 11 (S321) ◽

pp. 199-201 ◽

Cited By ~ 6

Author(s):

David Valls-Gabaud ◽

Keyword(s):

Surface Brightness ◽

Dwarf Galaxies ◽

Background Radiation ◽

Normal Galaxies ◽

Low Surface Brightness ◽

Drift Scan ◽

Optical Background ◽

Intracluster Light ◽

By Products ◽

Galactic Haloes

AbstractThe MESSIER surveyor is a small mission designed at exploring the very low surface brightness universe. The satellite will drift-scan the entire sky in 6 filters covering the 200–1000 nm range, reaching unprecedented surface brightness levels of 34 and 37 mag arcsec−2 in the optical and UV, respectively. These levels are required to achieve the two main science goals of the mission: to critically test the ΛCDM paradigm of structure formation through (1) the detection and characterisation of ultra-faint dwarf galaxies, which are predicted to be extremely abundant around normal galaxies, but which remain elusive; and (2) tracing the cosmic web, which feeds dark matter and baryons into galactic haloes, and which may contain the reservoir of missing baryons at low redshifts. A large number of science cases, ranging from stellar mass loss episodes to intracluster light through fluctuations in the cosmological UV-optical background radiation are free by-products of the full-sky maps produced.

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