CCD photometry of the globular cluster systems in NGC 4494 and NGC 4565

Fleming, David E.B.; Harris, William E.; Pritchet, C. J.; Hanes, David A.

doi:10.1086/117340

Cited by 73 publications

(99 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Assuming a foreground reddening of E(B À V ) ¼ 0:083 for NGC 524 and E(B À V ) ¼ 0:014 for NGC 1448 (Schlegel et al 1998), we find the lower limit distance moduli for these galaxies to be (m À M ) 0 > 31:6 (20.9 Mpc) for NGC 524 and (m À M ) 0 > 31:0 (15.8 Mpc) for NGC 1448. Fleming et al (1995). In the case of NGC 524, the fit is excellent, but due to crowding, the original fit of NGC 1448 (given as the dashed line) is relatively poor.…”

Section: Applicationmentioning

confidence: 95%

See 1 more Smart Citation

Calibrating Type Ia Supernovae Using the Planetary Nebula Luminosity Function. I. Initial Results

Feldmeier

Jacoby²,

Phillips

2007

ApJ

View full text Add to dashboard Cite

We report the results of an [O iii] k5007 survey for PNe in five galaxies that were hosts of well-observed SNe Ia: NGC 524, NGC 1316, NGC 1380, NGC 1448, and NGC 4526. The goals of this survey are to better quantify the zero point of the maximum magnitudeYdecline rate relation for SNe Ia and to validate the insensitivity of Type Ia luminosity to parent stellar population using the host galaxy Hubble type as a surrogate. We detected a total of 45 PN candidates in NGC 1316, 44 candidates in NGC 1380, and 94 candidates in NGC 4526. From these data and the empirical planetary nebula luminosity function (PNLF), we derive distances of 17:9 þ0:8 À0:9 , 16:1 þ0:8 À1:1 , and 13:6 þ1:3 À1:2 Mpc, respectively. Our derived distance to NGC 4526 has a lower precision due to the likely presence of Virgo intracluster PNe in the foreground of this galaxy. In NGC 524 and NGC 1448 we detected no PN candidates down to the limiting magnitudes of our observations. We present a formalism for setting realistic distance limits in these two cases and derive robust lower limits of 20.9 and 15.8 Mpc, respectively. After combining these results with other distances from the PNLF, Cepheid, and surface brightness fluctuation distance indicators, we calibrate the optical and NIR relations for SNe Ia and find that the Hubble constants derived from each of the three methods are broadly consistent, implying that the properties of SNe Ia do not vary drastically as a function of stellar population. We determine a preliminary Hubble constant of H 0 ¼ 77 AE 3 (random) AE 5 (systematic) km s À1 Mpc À 1 for the PNLF, although more nearby galaxies with high-quality observations are clearly needed.

show abstract

Section: Applicationmentioning

confidence: 95%

“…We now assume that the completeness function can be approximated in an interpolated form first given by Fleming et al (1995):…”

Section: Applicationmentioning

confidence: 99%

Calibrating Type Ia Supernovae Using the Planetary Nebula Luminosity Function. I. Initial Results

Feldmeier

Jacoby²,

Phillips

2007

ApJ

View full text Add to dashboard Cite

show abstract

“…which gives a good analytical description of the completeness, and which has been used for many GC studies (e.g., McLaughlin et al 1994;Fleming et al 1995;Wehner et al 2008;Alamo-Martínez et al 2012). The free parameters α and m 50 indicate the speed at which the detection rate falls at the faint level and the 50% completeness, respectively.…”

Section: Photometry Completenessmentioning

confidence: 99%

Isolated ellipticals and their globular cluster systems

Salinas

Alabi

Richtler

2015

A&A

View full text Add to dashboard Cite

As tracers of star formation, galaxy assembly, and mass distribution, globular clusters have provided important clues to our understanding of early-type galaxies. But their study has been mostly constrained to galaxy groups and clusters where early-type galaxies dominate, leaving the properties of the globular cluster systems (GCSs) of isolated ellipticals as a mostly uncharted territory. We present Gemini-South/GMOS g i observations of five isolated elliptical galaxies: NGC 3962, NGC 2865, IC 4889, NGC 2271, and NGC 4240. Photometry of their GCSs reveals clear color bimodality in three of them, but remains inconclusive for the other two. All the studied GCSs are rather poor with a mean specific frequency S N ∼ 1.5, independently of the parent galaxy luminosity. Considering information from previous work as well, it is clear that bimodality and especially the presence of a significant, even dominant, population of blue clusters occurs at even the most isolated systems, which casts doubts on a possible accreted origin of metal-poor clusters, as suggested by some models. Additionally, we discuss the possible existence of ultra-compact dwarfs around the isolated elliptical NGC 3962.

show abstract

“…As mentioned above, several completeness curves were generated for each galaxy in order to determine the stability of the photometric completeness limit over a range of background (Fleming et al 1995) governing the slope of the fit.…”

Section: Completeness Correctionmentioning

confidence: 99%

Intermediate-Age Globular Clusters in Four Galaxy Merger Remnants

Trancho

Miller

Schweizer

et al. 2014

ApJ

View full text Add to dashboard Cite

We present the results of combining Hubble Space Telescope optical photometry with ground-based K s -band photometry from the Gemini imagers NIRI and FLAMINGOS-I to study the globular cluster (GC) populations in four early-type galaxies that are candidate remnants of recent mergers (NGC 1700, NGC 2865, NGC 4382, and NGC 7727). These galaxies were chosen based on their blue colors and fine structure, such as shells and ripples that are indicative of past interactions. We fit the combined VI K s GC data with simple toy models of mixed cluster populations that contain three subpopulations of different age and metallicity. The fits, done via chi-squared mapping of the parameter space, yield clear evidence for the presence of intermediate-age clusters in each galaxy. We find that the ages of ∼1-2 Gyr for these GC subpopulations are consistent with the previously estimated merger ages for the host galaxies.

show abstract

CCD photometry of the globular cluster systems in NGC 4494 and NGC 4565

Cited by 73 publications

References 0 publications

Calibrating Type Ia Supernovae Using the Planetary Nebula Luminosity Function. I. Initial Results

Calibrating Type Ia Supernovae Using the Planetary Nebula Luminosity Function. I. Initial Results

Isolated ellipticals and their globular cluster systems

Intermediate-Age Globular Clusters in Four Galaxy Merger Remnants

Contact Info

Product

Resources

About